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Constraining long-term NOx emissions over the United States and Europe using nitrate wet deposition monitoring networks Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Amy Christiansen, Loretta J. Mickley, Lu Hu
Abstract. Nitrogen oxides (NOx= NO + NO2) play a critical role in regulating tropospheric chemistry, yet NOx emission estimates are subject to large uncertainties, casting doubt on our ability to accurately model secondary pollutants such as ozone. Bottom-up emissions inventories are subject to a number of uncertainties related to estimates of emission activities, scaling factors, and fuel sources
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Wintertime extreme warming events in the high Arctic: characteristics, drivers, trends, and the role of atmospheric rivers Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Weiming Ma, Hailong Wang, Gang Chen, Yun Qian, Ian Baxter, Yiling Huo, Mark W. Seefeldt
Abstract. An extreme warming event near the North Pole, with 2 m temperature rising above 0 °C, was observed in late December 2015. This specific event has been attributed to cyclones and their associated moisture intrusions. However, little is known about the characteristics and drivers of similar events in the historical record. Here, using data from European Centre for Medium-Range Weather Forecasts
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The Antarctic stratospheric nitrogen hole: Southern Hemisphere and Antarctic springtime total nitrogen dioxide and total ozone variability as observed by Sentinel-5p TROPOMI Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Adrianus de Laat, Jos van Geffen, Piet Stammes, Ronald van der A, Henk Eskes, J. Pepijn Veefkind
Abstract. Denitrification within the stratospheric vortex is a crucial process for Antarctic ozone hole formation, resulting in an analogous stratospheric “nitrogen hole”. Sedimentation of large nitric acid trihydrate polar stratospheric cloud particles within the Antarctic polar stratospheric vortex that form during winter depletes the inner vortex of nitrogen oxides. Here, 2018–2021 daily TROPOspheric
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Soot aerosols from commercial aviation engines are poor ice-nucleating particles at cirrus cloud temperatures Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Baptiste Testa, Lukas Durdina, Peter A. Alpert, Fabian Mahrt, Christopher H. Dreimol, Jacinta Edebeli, Curdin Spirig, Zachary C. J. Decker, Julien Anet, Zamin A. Kanji
Abstract. Ice-nucleating particles catalyze ice formation in clouds, affecting climate through radiative forcing from aerosol–cloud interactions. Aviation directly emits particles into the upper troposphere where ice formation conditions are favorable. Previous studies have used proxies of aviation soot to estimate their ice nucleation activity; however, investigations with commercial aircraft soot
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Lifecycle of updrafts and mass flux in isolated deep convection over the Amazon rainforest: insights from cell tracking Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Siddhant Gupta, Dié Wang, Scott E. Giangrande, Thiago S. Biscaro, Michael P. Jensen
Abstract. Long-term observations of deep convective cloud (DCC) vertical velocity and mass flux were collected during the Observations and Modelling of the Green Ocean Amazon (GoAmazon2014/5) experiment. Precipitation echoes from a surveillance weather radar near Manaus, Brazil, are tracked to identify and evaluate the isolated DCC lifecycle evolution during the dry and wet seasons. A radar wind profiler (RWP)
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Formation and loss of light absorbance by phenolic aqueous SOA by ●OH and an organic triplet excited state Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Stephanie Arciva, Lan Ma, Camille Mavis, Chrystal Guzman, Cort Anastasio
Abstract. Brown carbon (BrC) is an important component of biomass-burning (BB) emissions that impacts Earth's radiation budget. BB directly emits primary BrC as well as gaseous phenolic compounds (ArOH), which react in the gas and aqueous phases with oxidants – such as hydroxyl radical (⚫OH) and organic triplet excited states (3C∗) – to form light-absorbing secondary organic aerosol (SOA). These reactions
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Preindustrial to present-day changes in atmospheric carbon monoxide: agreements and gaps between ice archives and global model reconstructions Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Xavier Faïn, Sophie Szopa, Vaishali Naïk, Patricia Martinerie, David M. Etheridge, Rachael H. Rhodes, Cathy M. Trudinger, Vasilii V. Petrenko, Kévin Fourteau, Phillip Place
Abstract. Global chemistry-climate models (CCMs) play an important role in assessing the climate and air pollution implications of aerosols and chemically reactive gases. Evaluating these models under past conditions and constraining historical sources and sinks necessitates reliable records of atmospheric mixing ratios spanning preindustrial times. Such precious records were recently obtained for
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Formation of Reactive Nitrogen Species Promoted by Iron Ions Through the Photochemistry of Neonicotinoid Insecticide Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Zhu Ran, Yanan Hu, Yuanzhe Li, Xiaoya Gao, Can Ye, Shuai Li, Xiao Lu, Yongming Luo, Sasho Gligorovski, Jiangping Liu
Abstract. Nitrous acid (HONO) and nitrogen oxides (NOx = NO + NO2) are important atmospheric pollutants and key intermediates in the global nitrogen cycle, but their sources and formation mechanisms are still poorly understood. Here, we investigated the effect of soluble iron (Fe3+) on the photochemical behavior of a widely used neonicotinoid (NN) insecticide, nitenpyram (NPM), in the aqueous phase
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A global dust emission dataset for estimating dust radiative forcings in climate models Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Danny M. Leung, Jasper F. Kok, Longlei Li, David M. Lawrence, Natalie M. Mahowald, Simone Tilmes, Erik Kluzek
Abstract. Sedimentary records indicate that atmospheric dust has increased substantially since preindustrial times. However, state-of-the-art global Earth system models (ESMs) are unable to capture this historical increase, posing challenges in assessing the impacts of desert dust on Earth’s climate. To address this issue, we construct a globally gridded dust emission dataset (DustCOMMv1) spanning
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Nocturnal Atmospheric Synergistic Oxidation Reduces the Formation of Low-volatility Organic Compounds from Biogenic Emissions Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Han Zang, Zekun Luo, Chenxi Li, Ziyue Li, Dandan Huang, Yue Zhao
Abstract. Volatile organic compounds (VOCs) are often subject to synergistic oxidation by different oxidants in the atmosphere. However, the exact synergistic oxidation mechanism of atmospheric VOCs and its role in particle formation remain poorly understood. In particular, the reaction kinetics of the key reactive intermediates, organic peroxy radicals (RO2), during synergistic oxidation is rarely
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Global assessment of climatic responses to the ozone-vegetation interactions Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 Xinyi Zhou, Xu Yue, Chenguang Tian, Xiaofei Lu
Abstract. The coupling between surface ozone (O3) and vegetation significantly influences regional to global climate. O3 uptake by plant stomata inhibits photosynthetic rate and stomatal conductance, impacting evapotranspiration through land surface ecosystems. Using the climate-vegetation-chemistry coupled ModelE2-YIBs model, we assess the global climatic responses to O3-vegetation interactions during
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Fine and coarse dust radiative impact during an intense Saharan dust outbreak over the Iberian Peninsula. Part I: Short-wave direct radiative effect Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-17 María-Ángeles López-Cayuela, Carmen Córdoba-Jabonero, Michaël Sicard, Jesús Abril-Gago, Vanda Salgueiro, Adolfo Comerón, María José Granados-Muñoz, Maria João Costa, Constantino Muñoz-Porcar, Juan Antonio Bravo-Aranda, Daniele Bortoli, Alejandro Rodríguez-Gómez, Lucas Alados-Arboledas, Juan Luis Guerrero-Rascado
Abstract. Mineral dust has a key role in the Earth’s radiative balance, and it has become significant over the Iberian Peninsula (IP), where Saharan dust outbreaks seem to increase in frequency and intensity. This study quantifies the dust direct radiative effect (DRE) in the short-wave range (SW), during an intense persistent springtime dust episode over the IP. A long-term analysis (14 days) was
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Improved simulations of biomass burning aerosol optical properties and lifetimes in the NASA GEOS Model during the ORACLES-I campaign Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Sampa Das, Peter R. Colarco, Huisheng Bian, Santiago Gassó
Abstract. In order to improve aerosol representation in the NASA Goddard Earth Observing System (GEOS) model, we evaluated simulations of the transport and properties of aerosols from southern African biomass burning sources that were observed during the first deployment of the NASA ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS) field campaign in September 2016. An example case
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Technical Note: A technique to convert NO2 to NO2− with S(IV) and its application to measuring nitrate photolysis Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Aaron Lieberman, Julietta Picco, Murat Onder, Cort Anastasio
Abstract. Nitrate photolysis is a potentially significant mechanism for “renoxifying” the atmosphere, i.e., converting nitrate into nitrogen oxides – nitrogen dioxide (NO2) and nitric oxide (NO) – and nitrous acid (HONO). Nitrate photolysis in the environment occurs through two channels which produce (1) NO2 and hydroxyl radical (⚫OH) and (2) nitrite (NO2-) and an oxygen atom (O(3P)). Although the
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Measurement report: Long-term measurements of ozone concentrations in semi-natural African ecosystems Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Hagninou Elagnon Venance Donnou, Aristide Barthélémy Akpo, Money Ossohou, Claire Delon, Véronique Yoboué, Dungall Laouali, Marie Ouafo-Leumbe, Pieter Gideon Van Zyl, Ousmane Ndiaye, Eric Gardrat, Maria Dias-Alves, Corinne Galy-Lacaux
Abstract. In the framework of the International Network to study Deposition and Atmospheric chemistry in Africa (INDAAF) program, we present the seasonal variability of atmospheric ozone concentrations at the regional scale. The contributions of local atmospheric chemistry and meteorological parameters to ozone photochemistry are investigated, as are long-term trends in ozone concentrations. Fourteen
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Urban morphology modulates thunderstorm process and associatied cloud-to-ground lightning activity over Beijing metropolitan region Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Tao Shi, Yuanjian Yang, Gaopeng Lu, Zuofang Zheng, Yucheng Zi, Ye Tian, Lei Liu, Simone Lolli
Abstract. The effect of urban barriers may have a significant impact on the patterns of thunderstorm processes and lightning activity, but there is still a lack of comprehensive mechanical explanations. The observational analysis carried out in this study found that cloud-to-ground (CG) lighting activity tends to cluster around the outer boundaries of the mega cities, while, on the opposite, CG gathers
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Elevated oxidized mercury in the free troposphere: Analytical advances and application at a remote continental mountaintop site Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Eleanor J. Derry, Tyler Elgiar, Taylor Y. Wilmot, Nicholas W. Hoch, Noah S. Hirshorn, Peter Weiss-Penzias, Christopher F. Lee, John C. Lin, A. Gannet Hallar, Rainer Volkamer, Seth N. Lyman, Lynne E. Gratz
Abstract. Mercury (Hg) is a global atmospheric pollutant. In its oxidized form (HgII), atmospheric Hg can readily deposit to ecosystems, where it may bioaccumulate and cause severe health effects. High HgII concentrations are reported in the free troposphere, but spatiotemporal data coverage is limited. Underestimation of HgII by commercially available measurement systems hinders quantification of
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Modelling of atmospheric concentrations of fungal spores: a two-year simulation over France using CHIMERE Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Matthieu Vida, Gilles Foret, Guillaume Siour, Florian Couvidat, Olivier Favez, Gaelle Uzu, Arineh Cholakian, Sébastien Conil, Matthias Beekmann, Jean-Luc Jaffrezo
Abstract. Fungal spore organic aerosol emissions have been recognised as a significant source of particulate matter as PM10; however, they are not widely considered in current air quality models. In this work, we have implemented the parametrisation of fungal spore organic aerosol (OA) emissions introduced by Heald and Spracklen (2009) (H&S) and further modified by Hoose et al. (2010) in the CHIMERE
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Bridging Gas and Aerosol Properties between Northeast U.S. and Bermuda: Analysis of Eight Transit Flights Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Cassidy Soloff, Taiwo Ajayi, Yonghoon Choi, Ewan C. Crosbie, Joshua P. DiGangi, Glenn S. Diskin, Marta A. Fenn, Richard A. Ferrare, Francesca Gallo, Johnathan W. Hair, Miguel Ricardo A. Hilario, Simon Kirschler, Richard H. Moore, Taylor J. Shingler, Michael A. Shook, Kenneth L. Thornhill, Christiane Voigt, Edward L. Winstead, Luke D. Ziemba, Armin Sorooshian
Abstract. The western North Atlantic Ocean is strongly influenced by continental outflow, making it an ideal region to study the atmospheric transition from a polluted coastline to the marine environment. Utilizing eight transit flights between NASA Langley Research Center (LaRC) in Hampton, Virginia and the remote island of Bermuda from NASA’s Aerosol Cloud meTeorology Interactions oVer the western
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Cloud water adjustments to aerosol perturbations are buffered by solar heating in non-precipitating marine stratocumuli Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Jianhao Zhang, Yao-Sheng Chen, Takanobu Yamaguchi, Graham Feingold
Abstract. Marine low-level clouds are key to the Earth’s energy budget due to their expansive coverage over global oceans and their high reflectance of incoming solar radiation. Their responses to anthropogenic aerosol perturbations remain the largest source of uncertainty in estimating the anthropogenic radiative forcing of climate. A major challenge is the quantification of the cloud water response
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Ammonia emission estimates using CrIS satellite observations over Europe Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Jieying Ding, Ronald van der A, Henk Eskes, Enrico Dammers, Mark Shephard, Roy Wichink Kruit, Marc Guevara, Leonor Tarrason
Abstract. Over the past century ammonia (NH3) emissions have increased with the growth of livestock and fertilizer usage. The abundant NH3 emissions lead to secondary fine particulate matter (PM2.5) pollution, climate change, reduction in biodiversity and affects human health. Up-to-date and spatially and temporally resolved information of NH3 emissions is essential to better quantify its impact. In
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An investigation into atmospheric nitrous acid (HONO) processes in South Korea Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-16 Kiyeon Kim, Kyung Man Han, Chul Han Song, Hyojun Lee, Ross Beardsley, Jinhyeok Yu, Greg Yarwood, Bonyoung Koo, Jasper Madalipay, Jung-Hun Woo, Seogju Cho
Abstract. Nitrous acid (HONO) is a main precursor of hydroxyl radicals (OH), which contribute to the formation of numerous secondary air pollutants in the troposphere. Despite its importance in atmospheric chemistry, HONO chemistry has not been fully incorporated into many chemical transport models (CTMs). Due to the lack of atmospheric HONO processes, CTM simulations often tend to underestimate atmospheric
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Effect of wind speed on marine aerosol optical properties over remote oceans with use of spaceborne lidar observations Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Kangwen Sun, Guangyao Dai, Songhua Wu, Oliver Reitebuch, Holger Baars, Jiqiao Liu, Suping Zhang
Abstract. Marine aerosol affects the global energy budget and regional weather. The production of marine aerosol is primarily driven by wind at the sea–air interface. Previous studies have explored the effects of wind on marine aerosol, mostly by examining the relationships between aerosol optical depth (AOD) and surface wind speed. In this paper, utilizing the synergy of aerosol and wind observations
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Modeling the drivers of fine PM pollution over Central Europe: impacts and contributions of emissions from different sources Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Lukáš Bartík, Peter Huszár, Jan Karlický, Ondřej Vlček, Kryštof Eben
Abstract. Fine particulate matter (PM2.5) is among the air pollutants representing the most critical threat to human health in Europe. For designing strategies to mitigate this kind of air pollution, it is essential to identify and quantify the sources of its components. Here, we utilized the regional chemistry transport model CAMx (Comprehensive Air Quality Model with Extensions) to investigate the
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Analysis of an intense O3 pollution episode on the Atlantic coast of the Iberian Peninsula using photochemical modeling: characterization of transport pathways and accumulation processes Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Eduardo Torre-Pascual, Gotzon Gangoiti, Ana Rodríguez-García, Estibaliz Sáez de Cámara, Joana Ferreira, Carla Gama, María Carmen Gómez, Iñaki Zuazo, Jose Antonio García, Maite de Blas
Abstract. A tropospheric O3 pollution episode over the Atlantic coast of the Iberian Peninsula during 2–6 August 2018 has been analyzed. The episode was characterized by a permanent wind shear throughout the entire period, making the observed ozone surface distribution especially difficult to explain. A new methodology is described to analyze upper-level atmospheric parameters, such as temperature
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Measurement report: Characteristics of nitrogen-containing organics in PM2.5 in Ürümqi, northwestern China – differential impacts of combustion of fresh and aged biomass materials Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Yi-Jia Ma, Yu Xu, Ting Yang, Hong-Wei Xiao, Hua-Yun Xiao
Abstract. Nitrogen-containing organic compounds (NOCs) are abundant and important aerosol components deeply involved in the global nitrogen cycle. However, the sources and formation processes of NOCs remain largely unknown, particularly in the city (Ürümqi, China) farthest from the ocean worldwide. Here, NOCs in PM2.5 collected in Ürümqi over a 1-year period were characterized by ultra-high-resolution
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Measurement report: Formation of tropospheric brown carbon in a lifting air mass Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Can Wu, Xiaodi Liu, Ke Zhang, Si Zhang, Cong Cao, Jianjun Li, Rui Li, Fan Zhang, Gehui Wang
Abstract. An enhanced formation of brown carbon (BrC) with a non-negligible warming effect at the tropopause has recently been found. However, its formation mechanism is unclear. Here we report a BrC formation process that happens during air mass upward transport by conducting simultaneously a 4-hour time resolution of measurement on atmospheric BrC at the mountain foot (MF, 400 m a.s.l.) and mountainside
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Retrieval of refractive index and water content for the coating materials of aged black carbon aerosol based on optical properties: a theoretical analysis Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Jia Liu, Cancan Zhu, Donghui Zhou, Jinbao Han
Abstract. Water content in the coatings of aged black carbon (BC) aerosol can be reflected through complex refractive index. In this study, the retrieval of refractive index and water content for the non-absorbing coatings of BC aerosol during the hygroscopic growth (RH=0–95 %) based on scattering and absorption properties is theoretically investigated. Optical properties of morphologically realistic
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Occurrence, abundance, and formation of atmospheric tarballs from a wide range of wildfires in the western US Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-15 Kouji Adachi, Jack E. Dibb, Joseph M. Katich, Joshua P. Schwarz, Hongyu Guo, Pedro Campuzano-Jost, Jose L. Jimenez, Jeff Peischl, Christopher D. Holmes, James Crawford
Abstract. Biomass burning emits large numbers of organic aerosol particles, a subset of which are called tarballs (TBs). TBs possess spherical morphology and unique physical, chemical, and optical properties. They are recognized as brown carbon aerosol particles, thereby having implications for climate through the absorption of solar radiation. Aerosol particles were collected from wildfire and agricultural
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Contribution of cooking emissions to the urban volatile organic compounds in Las Vegas, NV Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-12 Matthew M. Coggon, Chelsea E. Stockwell, Lu Xu, Jeff Peischl, Jessica B. Gilman, Aaron Lamplugh, Henry J. Bowman, Kenneth Aikin, Colin Harkins, Qindan Zhu, Rebecca H. Schwantes, Jian He, Meng Li, Karl Seltzer, Brian McDonald, Carsten Warneke
Abstract. Cooking is a source of volatile organic compounds (VOCs), which degrade air quality. Cooking VOCs have been investigated in laboratory and indoor studies, but the contribution of cooking to the spatial and temporal variability in urban VOCs is uncertain. In this study, a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) is used to identify and quantify cooking emission
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Atmospheric NH3 in urban Beijing: long-term variations and implications for secondary inorganic aerosol control Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-11 Ziru Lan, Xiaoyi Zhang, Weili Lin, Xiaobin Xu, Zhiqiang Ma, Jun Jin, Lingyan Wu, Yangmei Zhang
Abstract. Ammonia (NH3) has major effects on the environment and climate. In-situ measurements of NH3 concentrations taken between June 2009 and July 2020 at an urban site in Beijing were analyzed to study their long-term behaviors, responses to meteorological conditions and influences on the formation of secondary inorganic aerosols (SIAs). The total average NH3 mixing ratio was 26.9 ± 19.3 ppb (median
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A global re-analysis of regionally resolved emissions and atmospheric mole fractions of SF6 for the period 2005–2021 Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-11 Martin Vojta, Andreas Plach, Saurabh Annadate, Sunyong Park, Gawon Lee, Pallav Purohit, Florian Lindl, Xin Lan, Jens Mühle, Rona L. Thompson, Andreas Stohl
Abstract. We determine the global emission distribution of the potent greenhouse gas sulfur hexafluoride (SF6) for the period 2005–2021 using inverse modeling. The inversion is based on 50-day backward simulations with the Lagrangian Particle Dispersion Model (LPDM) FLEXPART and on a comprehensive observation data set of SF6 mole fractions, in which we combine continuous with flask measurements sampled
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Diurnal evolution of non-precipitating marine stratocumuli in an LES ensemble Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-11 Yao-Sheng Chen, Jianhao Zhang, Fabian Hoffmann, Takanobu Yamaguchi, Franziska Glassmeier, Xiaoli Zhou, Graham Feingold
Abstract. We explore the impacts of the diurnal cycle, free-tropospheric (FT) humidity values, and interactive surface fluxes on the cloud system evolution of non-precipitating marine stratocumuli based on a large ensemble of large-eddy simulations. Cases are separated into three categories based on their degree of decoupling and cloud liquid water path (LWPc). A new budget analysis method is proposed
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Revealing dominant patterns of aerosols regimes in the lower troposphere and their evolution from preindustrial times to the future in global climate model simulations Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-11 Jingmin Li, Mattia Righi, Johannes Hendricks, Christof G. Beer, Ulrike Burkhardt, Anja Schmidt
Abstract. Aerosols play an important role in the Earth system, but their impact on cloud properties and the resulting radiative forcing of climate remains highly uncertain. The large temporal and spatial variability of a number of aerosols properties and the choice of different ‘pre-industrial’ reference years prevent a concise understanding of basic underlying patterns and trends in aerosols and their
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Elucidating the boundary layer turbulence dissipation rate using high-resolution measurements from a radar wind profiler network over the Tibetan Plateau Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-11 Deli Meng, Jianping Guo, Xiaoran Guo, Yinjun Wang, Ning Li, Yuping Sun, Zhen Zhang, Na Tang, Haoran Li, Fan Zhang, Bing Tong, Hui Xu, Tianmeng Chen
Abstract. The planetary boundary layer (PBL) over the Tibetan Plateau (TP) exerts a significant influence on regional and global climate, while its vertical structures of turbulence and evolution features remain poorly understood, largely due to the scarcity of observation. This study examines the vertical profile and daytime variation of turbulence dissipation rate (ε) in the PBL over the TP using
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The radiative impact of biomass burning aerosols on dust emissions over Namibia and the long-range transport of smoke observed during the Aerosols, Radiation and Clouds in southern Africa (AEROCLO-sA) campaign Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-10 Cyrille Flamant, Jean-Pierre Chaboureau, Marco Gaetani, Kerstin Schepanski, Paola Formenti
Abstract. The radiative effects of biomass burning aerosols (BBAs) on low-level atmospheric circulation over southern Africa are investigated on 5 September 2017 during the Aerosols, Radiation and Clouds in southern Africa (AEROCLO-sA) field campaign. This is conducted using a variety of in situ and remote sensing observations, as well as two 5 d ensemble simulations made with the Meso-NH mesoscale
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Present-Day Methane Shortwave Absorption Mutes Surface Warming and Wetting Relative to Preindustrial Conditions Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-10 Robert J. Allen, Xueying Zhao, Cynthia A. Randles, Ryan J. Kramer, Bjorn H. Samset, Christopher J. Smith
Abstract. Recent analyses show the importance of methane shortwave absorption, which many climate models lack. In particular, Allen et al. (2023) used idealized climate model simulations to show that methane shortwave absorption mutes up to 30 % of the surface warming and 60 % of the precipitation increase associated with its longwave radiative effects. Here, we explicitly quantify the radiative and
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Pollution affects Arabian and Saharan dust optical properties in the Eastern Mediterranean Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-10 Marilena Teri, Josef Gasteiger, Katharina Heimerl, Maximilian Dollner, Manuel Schöberl, Petra Seibert, Anne Tipka, Thomas Müller, Sudharaj Aryasree, Konrad Kandler, Bernadett Weinzierl
Abstract. Uncertainties in the mineral dust’s direct radiative effect arise from the variability in its optical properties. The optical properties can also be influenced by mixing processes with anthropogenic aerosols, such as black carbon or fine particles (called "pollution" in this study). We aimed to investigate the effect of mixing pollution with mineral dust aerosols from different source regions
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Atmospheric oxygen as a tracer for fossil fuel carbon dioxide: a sensitivity study in the UK Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Hannah Chawner, Eric Saboya, Karina E. Adcock, Tim Arnold, Yuri Artioli, Caroline Dylag, Grant L. Forster, Anita Ganesan, Heather Graven, Gennadi Lessin, Peter Levy, Ingrid T. Luijkx, Alistair Manning, Penelope A. Pickers, Chris Rennick, Christian Rödenbeck, Matthew Rigby
Abstract. We investigate the use of atmospheric oxygen (O2) and carbon dioxide (CO2) measurements for the estimation of the fossil fuel component of atmospheric CO2 in the UK. Atmospheric potential oxygen (APO) – a tracer that combines O2 and CO2, minimizing the influence of terrestrial biosphere fluxes – is simulated at three sites in the UK, two of which make APO measurements. We present a set of
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Reanalysis of NOAA H2 observations: implications for the H2 budget Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Fabien Paulot, Gabrielle Pétron, Andrew M. Crotwell, Matteo B. Bertagni
Abstract. Hydrogen (H2) is a promising low-carbon alternative to fossil fuels for many applications. However, significant gaps in our understanding of the atmospheric H2 budget limit our ability to predict the impacts of greater H2 usage. Here we use NOAA H2 dry air mole fraction observations from air samples collected from ground-based and ship platforms during 2010–2019 to evaluate the representation
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Correction of stratospheric age of air (AoA) derived from sulfur hexafluoride (SF6) for the effect of chemical sinks Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Hella Garny, Roland Eichinger, Johannes C. Laube, Eric A. Ray, Gabriele P. Stiller, Harald Bönisch, Laura Saunders, Marianna Linz
Abstract. Observational monitoring of the stratospheric transport circulation, the Brewer–Dobson circulation (BDC), is crucial to estimate any decadal to long-term changes therein, a prerequisite to interpret trends in stratospheric composition and to constrain the consequential impacts on climate. The transport time along the BDC (i.e. the mean stratospheric age of air, AoA) can best be deduced from
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Identifying episodic carbon monoxide emission events in the MOPITT measurement dataset Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Paul S. Jeffery, James R. Drummond, Jiansheng Zou, Kaley A. Walker
Abstract. The Measurements Of Pollution In The Troposphere (MOPITT) instrument aboard NASA's Terra satellite has been measuring upwelling radiance in a nadir-viewing mode since March 2000. These radiance measurements are inverted to yield estimates of carbon monoxide (CO) profiles and total columns, providing the longest satellite record of this trace gas to date. The CO measurements from MOPITT have
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Parameterizations for global thundercloud corona discharge distributions Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Sergio Soler, Francisco J. Gordillo-Vázquez, Francisco J. Pérez-Invernón, Patrick Jöckel, Torsten Neubert, Olivier Chanrion, Victor Reglero, Nikolai Østgaard
Abstract. Four parameterizations have been developed to simulate global distributions of thundercloud streamer corona discharges (also known as Blue LUminous Events or BLUEs) mainly producing bluish optical emissions associated to the second positive system of N2 accompanied by no (or hardly detectable) 777.4 nm light emission. BLUEs occur globally between about 7 and 12 times less frequently (Soler
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Synergistic effects of previous winter NAO and ENSO on the spring dust activities in North China Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Falei Xu, Shuang Wang, Yan Li, Juan Feng
Abstract. Dust plays an important role in influencing global weather and climate via impacting the Earth's radiative balance. Based on the atmospheric and oceanic datasets during 1980–2022, the impacts of preceding winter North Atlantic Oscillation (NAO) and El Niño-Southern Oscillation (ENSO) on the following spring dust activities over North China are explored. It is found that both NAO and ENSO
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Ice-nucleating particles active below -24 °C in a Finnish boreal forest and their relationship to bioaerosols Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-09 Franziska Vogel, Michael P. Adams, Larissa Lacher, Polly Foster, Grace C. E. Porter, Barbara Bertozzi, Kristina Höhler, Julia Schneider, Tobias Schorr, Nsikanabasi S. Umo, Jens Nadolny, Zoé Brasseur, Paavo Heikkilä, Erik S. Thomson, Nicole Büttner, Martin I. Daily, Romy Fösig, Alexander D. Harrison, Jorma Keskinen, Ulrike Proske, Jonathan Duplissy, Markku Kulmala, Tuukka Petäjä, Ottmar Möhler, Benjamin
Abstract. Cloud properties are strongly influenced by ice formation, hence we need to understand the sources of ice-nucleating particles (INPs) around the globe. Boreal forests are known as sources of bioaerosol and recent work indicates that these dominate the INP spectra above -24 °C. To quantify the INP population at temperatures below -24 °C, we deployed a portable cloud expansion chamber (PINE)
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Measurement report: Bio-physicochemistry of tropical clouds at Maïdo (Réunion, Indian Ocean): overview of results from the BIO-MAÏDO campaign Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Maud Leriche, Pierre Tulet, Laurent Deguillaume, Frédéric Burnet, Aurélie Colomb, Agnès Borbon, Corinne Jambert, Valentin Duflot, Stéphan Houdier, Jean-Luc Jaffrezo, Mickaël Vaïtilingom, Pamela Dominutti, Manon Rocco, Camille Mouchel-Vallon, Samira El Gdachi, Maxence Brissy, Maroua Fathalli, Nicolas Maury, Bert Verreyken, Crist Amelynck, Niels Schoon, Valérie Gros, Jean-Marc Pichon, Mickael Ribeiro
Abstract. The BIO-MAÏDO (Bio-physicochemistry of tropical clouds at Maïdo: processes and impacts on secondary organic aerosols formation) campaign was conducted from 13 March to 4 April 2019 on the tropical island of Réunion. The main objective of the project was to improve understanding of cloud impacts on the formation of secondary organic aerosols (SOA) from biogenic volatile organic compound (BVOC)
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Sharp increase in Saharan dust intrusions over the western Euro-Mediterranean in February–March 2020–2022 and associated atmospheric circulation Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Emilio Cuevas-Agulló, David Barriopedro, Rosa Delia García, Silvia Alonso-Pérez, Juan Jesús González-Alemán, Ernest Werner, David Suárez, Juan José Bustos, Gerardo García-Castrillo, Omaira García, África Barreto, Sara Basart
Abstract. During the months of February–March (FM) of the 2020–2022 period, several intense dust intrusions from northern Africa affected Europe. The frequency of dust events was exceptional, considering that wintertime is the season with minimum dust activity in the Mediterranean, and some episodes displayed a duration and/or intensity never recorded before, affecting large areas of the western Euro-Mediterranean
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Temporal and spatial variations in dust activity in Australia based on remote sensing and reanalysis datasets Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Yahui Che, Bofu Yu, Katherine Bracco
Abstract. Spatial and temporal variations in the level of dust activity can provide valuable information for policymaking and climate research. Recently, Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol products have been successfully used for retrieving dust aerosol optical depth (DAOD), especially over bright dust source areas, and Modern-Era Retrospective analysis for Research and Applications
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Evaluation of downward and upward solar irradiances simulated by the Integrated Forecasting System of ECMWF using airborne observations above Arctic low-level clouds Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Hanno Müller, André Ehrlich, Evelyn Jäkel, Johannes Röttenbacher, Benjamin Kirbus, Michael Schäfer, Robin J. Hogan, Manfred Wendisch
Abstract. The simulations of upward and downward irradiances by the Integrated Forecasting System (IFS) of the European Centre for Medium-Range Weather Forecasts are compared with broadband solar irradiance measurements from the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) campaign. For this purpose, offline radiative transfer simulations were performed with the ecRad
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Diagnosing ozone–NOx–VOC–aerosol sensitivity and uncovering causes of urban–nonurban discrepancies in Shandong, China, using transformer-based estimations Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Chenliang Tao, Yanbo Peng, Qingzhu Zhang, Yuqiang Zhang, Bing Gong, Qiao Wang, Wenxing Wang
Abstract. Narrowing surface ozone disparities between urban and nonurban areas escalate health risks in densely populated urban zones. A comprehensive understanding of the impact of ozone photochemistry on this transition remains constrained by current knowledge of aerosol effects and the availability of surface monitoring. Here we reconstructed spatiotemporal gapless air quality concentrations using
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Atmospheric Black Carbon in the metropolitan area of La Paz and El Alto, Bolivia: concentration levels and emission sources Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Valeria Mardoñez-Balderrama, Griša Močnik, Marco Pandolfi, Robin Modini, Fernando Velarde, Laura Renzi, Angela Marinoni, Jean-Luc Jaffrezo, Isabel Moreno R., Diego Aliaga, Federico Bianchi, Claudia Mohr, Martin Gysel-Beer, Patrick Ginot, Radovan Krejci, Alfred Widensohler, Gaëlle Uzu, Marcos Andrade, Paolo Laj
Abstract. Black carbon (BC) is a major component of sub-micron particulate matter (PM) with significant health and climate impacts. Many cities in emerging countries lack comprehensive knowledge about BC emissions and exposure levels. This study investigates BC concentration levels, identify its emission sources, and characterize the optical properties of BC at urban background sites of the two largest
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Source analyses of ambient VOCs considering reactive losses: methods of reducing loss effects, impacts of losses, and sources Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Baoshuang Liu, Yao Gu, Yutong Wu, Qili Dai, Shaojie Song, Yinchang Feng, Philip K. Hopke
Abstract. Chemical losses of ambient reactive volatile organic compounds (VOCs) is a long-term issue yet to be resolved in VOC source apportionments. These losses substantially reduce the concentrations of highly reactive species in the apportioned factor profiles and result in the underestimation of source contributions. This review assesses the common methods and existing issues in ways to reduce
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Impact of improved representation of VOC emissions and production of NOx reservoirs on modeled urban ozone production Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Katherine R. Travis, Benjamin A. Nault, James H. Crawford, Kelvin H. Bates, Donald R. Blake, Ronald C. Cohen, Alan Fried, Samuel R. Hall, L. Greg Huey, Young Ro Lee, Simone Meinardi, Kyung-Eun Min, Isobel J. Simpson, Kirk Ullman
Abstract. The fraction of urban volatile organic compounds (VOC) emissions attributable to fossil fuel combustion has been declining in many parts of the world, resulting in a need to better constrain other anthropogenic sources of these emissions. During the National Institute of Environmental Research (NIER) and National Aeronautics and Space Administration (NASA) Korea-United States Air Quality
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Ice nucleation from drop-freezing experiments: Impact of droplet volume dispersion and cooling rates Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Ravi Kumar Reddy Addula, Ingrid de Almeida Ribeiro, Valeria Molinero, Baron Peters
Abstract. Because homogeneous ice nucleation is important for atmospheric science, special assays have been developed to monitor ultra-pure nanoscale water droplets for nucleation as the temperature is gradually lowered to deeply supercooled conditions. To analyze the experimental data and predict droplet freezing, we develop model that accounts for the cooling rate and the distribution of droplet
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Cluster Dynamics-based Parameterization for Sulfuric Acid-Dimethylamine Nucleation: Comparison and Selection through Box- and Three-Dimensional- Modeling Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Jiewen Shen, Bin Zhao, Shuxiao Wang, An Ning, Yuyang Li, Runlong Cai, Da Gao, Biwu Chu, Yang Gao, Manish Shrivastava, Jingkun Jiang, Xiuhui Zhang, Hong He
Abstract. Clustering of gaseous sulfuric acid (SA) enhanced by dimethylamine (DMA) is a major mechanism for new particle formation (NPF) in polluted atmospheres. However, uncertainty remains regarding the SA-DMA nucleation parameterization that reasonably represents cluster dynamics and is applicable across various atmospheric conditions. This uncertainty hinders accurate three-dimensional (3-D) modeling
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Impacts of elevated anthropogenic emissions on physicochemical characteristics of BC-containing particles over the Tibetan Plateau Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-08 Jinbo Wang, Jiaping Wang, Yuxuan Zhang, Tengyu Liu, Xuguang Chi, Xin Huang, Dafeng Ge, Shiyi Lai, Caijun Zhu, Lei Wang, Qiaozhi Zha, Ximeng Qi, Wei Nie, Congbin Fu, Aijun Ding
Abstract. Black carbon (BC) in the Tibetan Plateau (TP) region has distinct climate effect, which strongly depends on its mixing state. The aging processes of BC in TP are subject to emissions from various regions, resulting in considerable variability of its mixing state and physicochemical properties. However, the mechanism and magnitude of this effect are not yet clear. In this study, filed observations
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Sensitivity of global direct aerosol shortwave radiative forcing to uncertainties in aerosol optical properties Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-05 Jonathan Elsey, Nicolas Bellouin, Claire Ryder
Abstract. New satellite missions promise global reductions in the uncertainties in aerosol optical properties, but it is unclear how those reductions will propagate to uncertainties in the shortwave (SW) direct aerosol radiative effect (DARE) and direct aerosol radiative forcing (DARF), which are currently large, on the order of at least 20 %. In this work, we build a Monte Carlo framework to calculate
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Global Spatial Variation in the PM2.5 to AOD Relationship Strongly Influenced by Aerosol Composition Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-05 Haihui Zhu, Randall Martin, Aaron van Donkelaar, Melanie Hammer, Chi Li, Jun Meng, Christopher Oxford, Xuan Liu, Yanshun Li, Dandan Zhang, Inderjeet Singh, Alexei Lyapustin
Abstract. Ambient fine particulate matter (PM2.5) is the leading global environmental determinant of mortality. However, large gaps exist in ground-based PM2.5 monitoring. Satellite remote sensing of aerosol optical depth (AOD) offers information to fill these gaps worldwide, when augmented with a modeled PM2.5 to AOD relationship (η). This study aims to understand the spatial pattern and driving factors
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The impact of nanostructure on hygroscopicity and reactivity of fatty acid atmospheric aerosol proxies Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-05 Adam Milsom, Adam M. Squires, Ben Laurence, Ben Wōden, Andrew J. Smith, Andrew D. Ward, Christian Pfrang
Abstract. Atmospheric aerosol hygroscopicity and reactivity play key roles in determining the aerosol’s fate and are strongly affected by its composition and physical properties. Fatty acids are surfactants commonly found in organic aerosol emissions. They form a wide range of different nanostructures dependent on water content and mixture composition. In this study we follow nano-structural changes
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An Air Quality and Boundary Layer Dynamics Analysis of the Los Angeles Basin Area During the Southwest Urban NOx and VOCs Experiment (SUNVEx) Atmos. Chem. Phys. (IF 6.3) Pub Date : 2024-04-05 Edward J. Strobach, Sunil Baidar, Brian J. Carroll, Steven S. Brown, Kristen Zuraski, Matthew Coggon, Chelsea E. Stockwell, Lu Xu, Yelena L. Pichugina, Alan Brewer, Carsten Warneke, Jeff Peischl, Jessica Gilman, Brandi McCarty, Maxwell Holloway, Richard Marchbanks
Abstract. The NOAA Chemical Sciences Laboratory (CSL) conducted the Southwest Urban NOx and VOCs Experiment (SUNVEx) to study emissions and the role of boundary layer (BL) dynamics and seabreeze (SB) transitions on the time evolution of coastal air quality. The study presented focuses utilizes remote sensing and in situ observations in Pasadena, California. Investigations of the synoptic conditions