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The Response of the Upper Ocean to Tropical Cyclones in the South Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-16 Chao Han, Melissa Bowen, Philip Sutton
Consecutive Argo float profiles are used to observe upper ocean changes resulting from the passage of tropical cyclones (TCs) in the South Pacific between 2001 and 2023. Cross-sectional composites of the ocean response are produced by normalizing the distance between the profile and cyclone track by the 34-knot wind radius (R34) of each TC to better resolve the average changes in water properties.
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Spatiotemporal Variations in Upper-Ocean Salinity Over the North Pacific in 2004–2021 J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-16 Yoshimi Kawai, Shota Katsura, Shigeki Hosoda
Interannual variations in upper ocean salinity in the North Pacific Ocean (NP) were examined comprehensively over a period of 18 years (2004–2021) with gridded data sets considering vertical profiles of salinity. The salinity in nearly half of the basin varied in phase with a slight lag, and the rest of the basin exhibited the opposite phase on a decadal scale. The average salinity above 400 dbar prominently
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Distribution, Seasonality, and Water-Mass Transformation of Temperature and Salinity Inversions in the Southern Yellow Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-16 Zhaoyi Wang, Wei Yang, Guisheng Song, Haiyan Zhang, Hao Wei
In the southern Yellow Sea (SYS) there are temperature and salinity inversions associated with the presence of middepth low temperature and salinity water. Many questions regarding with the inversions, such as the seasonal variation and transformation mechanism, still remain unexplained. In this study, based on hydrographic measurements obtain from 12 cruises within 6-year (2017–2022), we explored
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The Combined Effects of Ocean Acidification and Respiration on Habitat Suitability for Marine Calcifiers Along the West Coast of North America J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-12 Richard A. Feely, Brendan R. Carter, Simone R. Alin, Dana Greeley, Nina Bednaršek
The California Current Ecosystem (CCE) is a natural laboratory for studying the chemical and ecological impacts of ocean acidification. Biogeochemical variability in the region is due primarily to wind-driven near-shore upwelling of cold waters that are rich in re-mineralized carbon and poor in oxygen. The coastal regions are exposed to surface waters with increasing concentrations of anthropogenic
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Impact of the North Atlantic Oscillation on the Decadal Variability of the Upper Subtropical-Tropical Atlantic Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-11 M. Roch, P. Brandt, S. Schmidtko, F. P. Tuchen
In the northeastern tropical Atlantic, a region of high potential vorticity (PV) determines the size of the exchange window for the interior thermocline flow of the subtropical cell via its variations in strength and extent. Variability of this PV barrier has the potential to impact the ventilation of the tropical Atlantic on decadal timescales. Here, the impact of the North Atlantic Oscillation (NAO)
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Impacts of ENSO on Tropical Pacific Chlorophyll Biomass Under Historical and RCP8.5 Scenarios J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-09 Ruiying Chen, Bizhi Wu, Zeming Li, Shanlin Wang
The present study aims to investigate the influences of El Niño and Southern Oscillation (ENSO) events on chlorophyll biomass in the tropical Pacific under historical and RCP8.5 scenarios with simulations from the Community Earth System Model Large Ensemble (CESM-LE) project. Large variance in surface chlorophyll concentrations is identified across the Peruvian Upwelling (PU), Equatorial Upwelling
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Odden Ice Melt Linked to Labrador Sea Ice Expansions and the Great Salinity Anomalies of 1970–1995 J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-09 David Allan, Richard P. Allan
In each of the last three decades of the 20th century there were unprecedented expansions of sea-ice over the Labrador Sea basin and influxes of cold fresh water into the subpolar gyre (SPG) which have been described as the Great Salinity Anomalies (GSAs). Employing data for sea surface temperature, salinity, and sea-ice cover, we propose that these events were downstream consequences of the expansion
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Breaking the Ice: Exploring the Changing Dynamics of Winter Breakup Events in the Beaufort Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-09 Jonathan W. Rheinlænder, Heather Regan, Pierre Rampal, Guillaume Boutin, Einar Ólason, Richard Davy
The Beaufort Sea has experienced a significant decline in sea ice, with thinner first-year ice replacing thicker multi-year ice. This transition makes the ice cover weaker and more mobile, making it more vulnerable to breakup during winter. Using a coupled ocean-sea-ice model, we investigated the impact of these changes on sea-ice breakup events and lead formation from 2000 to 2018. The simulation
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Can Mesoscale Eddy Kinetic Energy Sources and Sinks Be Inferred From Sea Surface Height in the Agulhas Current Region? J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-09 P. Tedesco, J. Gula, P. Penven, C. Ménesguen, Q. Jamet, C. Vic
Western boundaries have been suggested as mesoscale eddy graveyards, using a diagnostic of the eddy kinetic energy (EKE) flux divergence based on sea surface height (η). The graveyard's paradigm relies on the approximation of geostrophy—required by the use of η—and other approximations that support long baroclinic Rossby waves as the dominant contribution to the EKE flux divergence. However, a recent
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Circulation and Retention of River Plumes Around Capes J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-09 L. Fernando Pareja-Roman, Robert J. Chant, Piero L. F. Mazzini, Kelly Cole
River plumes often interact with capes in the coastal ocean, impacting local hydrodynamics and the transport of scalars. However, our current knowledge on how capes affect river plume separation, mixing, and retention is limited. Here, we conducted idealized numerical experiments with Gaussian-shaped capes of varying curvature radii, constant river discharge, a sloping bottom, and scenarios with and
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Observational Analysis of Vertical Heat Flux Caused by Typhoon-Induced Near-Inertial Waves Under the Modulation of Mesoscale Eddies J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-08 Xiaojie Lu, Changming Dong, Han Zhang, Kenny T. C. Lim Kam Sian, Jingsong Yang, Zhenhua Xu, Gang Li, Qingyue Wang, Qian Cao, Zhiwei You, Joёl Sommeria
Tropical cyclones (TCs) induce heat pump and cold suction in the upper ocean layer. However, limited research investigated whether this heat can be effectively transported into the deep ocean. The present study shows that seawater at Station S2 is anomalously warmer in the deep ocean layer than at S1 and S3 during Typhoon Kalmaegi (2014) in the South China Sea. The turbulence-induced vertical heat
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Three-Dimensional Water Exchanges in the Shelf Circulation System of the Northern South China Sea Under Climatic Modulation From ENSO J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-08 Lingbo Cui, Zhiqiang Liu, Ying Chen, Zhongya Cai
Using the numerical calculations of exposure time ( θ ‾ $\overline{\theta }$ ), this study investigated the three-dimensional characteristics of water exchanges associated with the coastal-shelf circulations of the Northern South China Sea (NSCS). The circulation connectivity and its interannual variability under the modulation of El Niño Southern Oscillation (ENSO) were investigated. The θ ‾ $\overline{\theta
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Nitrogen Fixation at the Mid-Atlantic Bight Shelfbreak and Transport of Newly Fixed Nitrogen to the Slope Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-05 C. R. Selden, M. R. Mulholland, K. E. Crider, S. Clayton, A. Macías-Tapia, P. Bernhardt, D. J. McGillicuddy, W. G. Zhang, P. D. Chappell
Continental shelves contribute a large fraction of the ocean's new nitrogen (N) via N2 fixation; yet, we know little about how physical processes at the ocean's margins shape diazotroph biogeography and activity. Here, we test the hypothesis that frontal mixing favors N2 fixation at the Mid-Atlantic Bight shelfbreak. Using the 15N2 bubble release method, we measured N2 fixation rates on repeat cross-frontal
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The Summer Kuroshio Intrusion Into the East China Sea Revealed by a New Mixed-Layer Water Mass Analysis J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-06 Shuangzhao Li, Yisen Zhong, Meng Zhou, Hui Wu, Yonghui Gao, Peng Zhou, Yihe Wang, Zhaoru Zhang, Han Zhang
Though the Kuroshio intrusion (KI) into the East China Sea (ECS) is relatively weaker during summer, it is of great importance to the ECS shelf ecosystem in this biologically-active season. The interannual variability of the summer intrusion is less explored as the long-term observations of the oceanic current are insufficient to draw a complete and unbiased conclusion. Using 3-year in situ measurements
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A Global Assessment of Eddy-Induced Salinity Anomalies and Salt Transport by Eddy Movement J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-06 Danhong Mo, Qingyou He, Weikang Zhan, Yinghui He, Haigang Zhan
Eddy-induced salt transport is essential in maintaining the oceanic salinity balance and global climate. However, the paucity of in situ measurements poses challenges in obtaining the spatial structure of the eddy salt transport globally. Here, we conduct a global estimation of eddy-induced salinity anomalies and salt transport by eddy movement using 2 million historical hydrographic profile measurements
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Fetch-Limited, Strongly Forced Wind Waves in Waters With Frazil and Grease Ice – Spectral Modeling and Satellite Observations in an Antarctic Coastal Polynya J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-03 Agnieszka Herman, Katarzyna Bradtke
Sea ice–wave interactions have been widely studied in the marginal ice zone, at relatively low wind speeds and wave frequencies. Here, we focus on very different conditions typical of coastal polynyas: extremely high wind speeds and locally generated, short, steep waves. We overview available parameterizations of relevant physical processes (nonlinear wave–wave interactions, energy input by wind, whitecapping
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Trends of Sediment Resuspension and Budget in Southern Lake Michigan Under Changing Wave Climate and Hydrodynamic Environment J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-05 Longhuan Zhu, Pengfei Xue, Guy A. Meadows, Chenfu Huang, Jianzhong Ge, Cary D. Troy, Chin H. Wu
Sediment suspension and transport driven by waves and currents play a significant role in both the ecological and physical environments of large lakes. Lake Michigan has faced a rapidly increasing water level associated with intensified wind waves in the past decade. To investigate the spatiotemporal characteristics of suspended sediment concentration (SSC) and associated coastal sediment budgets in
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Coarse Sand Transport Processes in the Ripple Vortex Regime Under Asymmetric Nearshore Waves J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-05 N. Fritsch, G. Fromant, D. Hurther, I. Cáceres
Large-scale wave flume experiments are conducted in the ripple vortex regime to study near bed coarse sand transport processes below asymmetric surface waves typical of the coastal nearshore region. For this purpose, a set of complementary acoustic instruments were deployed under regular nearshore wave conditions. Time-resolved velocity, sand concentration and sand flux profiles are measured across
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Methane Distribution, Production, and Emission in the Western North Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-05 Hao-Nan Wang, Guan-Xiang Du, Shu-Xian Yu, Hong-Hai Zhang, Guo-Dong Song, Su-Mei Liu, Nan Zheng, Xiao-Hua Zhang, Gui-Ling Zhang
The ocean is a source of atmospheric methane (CH4), but there are still large uncertainties in the estimations of global oceanic CH4 emission due to sparse data coverage. In this study, we investigated the spatial distribution and influencing factors of CH4 in the Western North Pacific (WNP) during May–June 2021. High-resolution continuous underway measurements showed that surface CH4 concentrations
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Modulation of Annual Rossby Waves on the Formation of Basin-Wide Salinity Fronts J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-05 Jiechao Zhu, Yuhong Zhang, Ke Huang, Yifan Xia, Yan Du
This study reveals the formation mechanisms of a group of salinity fronts across the Arabian Sea (AS) and explores their associations with annual Rossby waves, utilizing Soil Moisture Active Passive (SMAP) satellite data and other relevant data sets. As low-salinity water is transported westward and northward at varying rates between 6°N ∼ 20°N, substantial basin-wide northeast-southwest oriented salinity
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Response of Onshore Oceanic Heat Supply to Yearly Changes in the Amundsen Sea Icescape (Antarctica) J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-04 P. St-Laurent, S. E. Stammerjohn, T. Maksym
The heat transfer between the warm oceanic water and the floating portion of the Antarctic ice sheet (the ice shelves) occurs in a dynamic environment with year-to-year changes in the distribution of icebergs and fast-ice (the “icescape”). Dramatic events such as the collapse of glacier tongues are apparent in satellite images but oceanographic observations are insufficient to capture the synoptic
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On the Spatio-Temporal Scales of the Subtropical Mode Water Formation in the South Atlantic J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-02 O. T. Sato, P. S. Polito, M. Dottori
We examined the changes in the ocean’s upper layer structure involved in the formation of the subtropical mode water in the South Atlantic. Here we present the results from a survey done in the region of formation between 37°W and 32°W and 34°S and 37°S from July–October 2018, using high-resolution measurements obtained from an underwater glider. From its records, the mode water development was observed
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Turbulence From Tropical Instability Waves in the Equatorial Cold Tongues: Quantification From Multiyear Moored Records J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-02 Suneil Iyer, James N. Moum
Tropical instability waves (TIWs) are identified in three multiyear equatorial mooring records in Pacific and Atlantic cold tongues to evaluate how TIWs modulate turbulence. At 0°, 140°W in the Pacific, TIWs are present in 43% of observations, and are associated with elevated vertical shear and a 40% average increase in turbulence dissipation rates (ϵ) above the Equatorial Undercurrent. Zonal shear
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Observed Spatiotemporal Variability in the Annual Sea Level Cycle Along the Global Coast J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-02 A. Barroso, T. Wahl, S. Li, A. Enriquez, J. Morim, S. Dangendorf, C. Piecuch, P. Thompson
Changes in the seasonal sea level cycle can modulate the flooding risk along coastlines. Here, we use harmonic analysis to quantify changes in the amplitude and phase of the annual component of the sea level cycle at 798 tide gauge locations along the global coastline where long records are available. We identify coastal hotspots by applying clustering methods revealing coherent regions with similar
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Response of Internal Wave-Induced Turbulent Dissipation to ENSO in the Western Pacific Warm Pool J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-04-01 Jiahan Jiang, Guoqing Han, Yu Liu, Xiayan Lin, Yinghui He
This paper utilizes a finescale parameterization scheme based on strain spectra and characterizes the temporal and spatial distributions of diapycnal turbulent mixing in the West Pacific Warm Pool. We use Array for Real-Time Geostrophic Oceanography (Argo) profiles from 2011 to 2022 to generate the turbulent dissipation rate (ε) as a representative of internal-wave-induced mixing. We then discuss the
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Vertical Interaction Between NBC Rings and Its Implications for South Atlantic Water Export J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-27 Dante C. Napolitano, Xavier Carton, Jonathan Gula
Northwestward-propagating North Brazil Current (NBC) Rings are often destroyed upon reaching the Caribbean islands, carrying South Atlantic waters into the North Atlantic gyre and connecting the two branches of the Atlantic Meridional Overturning Circulation. Recent observations of NBC rings reported surface and subsurface cores separated by strong stratification. As independent structures, the subsurface
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Issue Information J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-27
No abstract is available for this article.
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Gas Emission Characteristics and Tectonic Implications in the Southernmost Okinawa Trough From Split-Beam Echo Sounder Observations J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-23 Yi Chin Lin, Jing-Yi Lin, Shu-Kun Hsu, Song-Chuen Chen, Shiao-Shan Lin, Ching-Hui Tsai
Traditionally, single-beam echo sounder (SBES) data are used to determine the position of emission structures in the form of a two-dimensional profile, which may not be straightforward enough to correlate the data of adjacent profiles and determine the exact discharge area. In this study, we develop semiautomatic software to remove noise and select possible flare signals to enhance the speed and precision
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Modeling Ocean Circulation and Ice Shelf Melt in the Bellingshausen Sea J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-21 Shuntaro Hyogo, Yoshihiro Nakayama, Vigan Mensah
The ice shelves in the Bellingshausen Sea are melting and thinning rapidly due to modified Circumpolar Deep Water (mCDW) intrusions carrying heat toward ice-shelf cavities. Observations are, however, sparse in time and space, and extensive model-data comparisons have never been possible. Here, using a circulation model of the region and ship-based observations, we show that the simulated water mass
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Evidence for Kilometer-Scale Biophysical Features at the Gulf Stream Front J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-21 Patrick Clifton Gray, Ivan Savelyev, Nicolas Cassar, Marina Lévy, Emmanuel Boss, Yoav Lehahn, Guillaume Bourdin, Kate A. Thompson, Anna Windle, Jessica Gronniger, Sheri Floge, Dana E. Hunt, Greg Silsbe, Zackary I. Johnson, David W. Johnston
Understanding the interplay of ocean physics and biology at the submesoscale and below (<30 km) is an ongoing challenge in oceanography. While poorly constrained, these scales may be of critical importance for understanding how changing ocean dynamics will impact marine ecosystems. Fronts in the ocean, regions where two disparate water masses meet and isopycnals become tilted toward vertical, are considered
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Submesoscale Processes Fueled by the Kuroshio in the Tokara Strait J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-18 Juntian Chen, Xiao-Hua Zhu, Hirohiko Nakamura, Ruixiang Zhao, Min Wang, Hua Zheng, Ayako Nishina
Submesoscale processes are essential in balancing global oceanic energy cascades and stimulating air–sea communications. However, measurements of submesoscale turbulence are still not acquired easily. Based on long-term (2003–2012) shipboard current observations, we obtained direct evidence of considerable submesoscale energization in the Kuroshio, implied by conspicuous spectral characteristics across
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Mixing of the Connecticut River Plume During Ambient Flood Tides: Spatial Heterogeneity and Contributions of Bottom-Generated and Interfacial Mixing J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-18 Michael M. Whitney, Preston Spicer, Daniel G. MacDonald, Kimberly D. Huguenard, Kelly L. Cole, Yan Jia, Nikiforos Delatolas
The Connecticut River plume is influenced by energetic ambient tides in the Long Island Sound receiving waters. The objectives of this modeling study are (a) characterizing the spatial heterogeneity of turbulent buoyancy fluxes, (b) partitioning turbulent buoyancy fluxes into bottom-generated and interfacial shear contributions, and (c) quantifying contributions to plume-integrated mixing within the
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Interannual Variability of Subpolar Mode Water in the Subpolar North Atlantic J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-18 I. Stendardo, B. Buongiorno Nardelli, S. Durante, D. Iudicone, D. Kieke
Subpolar Mode Water (SPMW) is an important water mass originating in the eastern North Atlantic. Its formation, subject to modification through oceanic interior mixing, can directly influence the volume of water contributing to the Atlantic meridional overturning circulation. Utilizing observation-based data sets spanning from 1993 to 2018, we estimated the formation rates and volume of SPMW within
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Spatial Scales of Kinetic Energy in the Arctic Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-16 Caili Liu, Qiang Wang, Sergey Danilov, Nikolay Koldonov, Vasco Müller, Xinyue Li, Dmitry Sidorenko, Shaoqing Zhang
Despite the importance of the Arctic Ocean for the large-scale circulation and climate, there is still a knowledge gap in our understanding of the spatial characteristics of the Arctic Ocean circulation, especially for the mesoscale. This paper investigates the spatial characteristics of the Arctic Ocean circulation using a simulation with 1 km horizontal resolution. We revealed that there are two
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Dynamics and Controls of Methane Oxidation in the Aerobic Waters of Eastern China Marginal Seas J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-12 Qiao Liu, Guanxiang Du, Xiao-Jun Li, Jiarui Liu, Ni Meng, Chun-Yang Li, Xiting Liu, Guiling Zhang, Gui-Peng Yang, Samantha Joye, Guang-Chao Zhuang
Aerobic methane oxidation (MOx) mediated by methanotrophs is a crucial mechanism in controlling methane emissions from the surface ocean to the atmosphere. Coastal waters dominate global oceanic methane emissions, but the dynamics, controls and roles of MOx remain largely unconstrained in the marginal seas around China. Here, we conducted a variety of biogeochemical analyses to investigate the controls
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Collapses, Maxima, Multi-Year Modulation and Trends of the Zapiola Anticyclonic Circulation: Insights From Mercator Reanalysis J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-13 Lea Poli, Camila Artana, Christine Provost, Jérôme Sirven, Ruben Le Blanc-Pressenda
The Argentine Basin hosts a unique oceanic feature: the Zapiola Anticyclonic Circulation (ZAC) located above a sedimentary deposit. Taking advantage of a high-resolution (1/12°) global ocean reanalysis (GLORYS12) we examine the ZAC over 27 years (1993–2019). The mean ZAC is bottom-intensified with bottom currents reaching 0.10 ms−1. The ZAC volume transport ranges from −18.5 to 268 Sv with a mean of
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Laboratory Investigation of Energy Dissipation and Turbulent Mixing During Internal Solitary Wave Breaking on the Rough Shelf Slope J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-09 Yeping Yuan, Yuanye Luo, Yixin Wang, Ying-Tien Lin, Qian Liu, Jinbao Song
When internal solitary waves (ISW) propagate to the continental shelf, they typically runup and break on the forereef. This process might lead to periodic temperature drops at the reef slope, which has potential to protect coral reefs from bleaching threats. A series of laboratory experiments were conducted to investigate turbulence characteristics and energy dissipation during the ISW breaking events
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Surface Heat Fluxes Drive a Two-Phase Response in Southern Ocean Mode Water Stratification J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-09 Ciara Pimm, Richard G. Williams, Dani Jones, Andrew J. S. Meijers
Subantarctic mode waters have low stratification and are formed through subduction from thick winter mixed layers in the Southern Ocean. To investigate how surface forcing affects the stratification in mode water formation regions in the Southern Ocean, a set of adjoint sensitivity experiments are conducted. The objective function is the annual-average stratification over the mode water formation region
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Signature of Mesoscale Eddies on Air-Sea Heat Fluxes in the North Indian Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-09 Yanxu Chen, Lisan Yu
Using a combination of 20-year (1999–2018) remotely-sensed air-sea heat flux products and altimeter-based eddy atlas, we investigate the signature of mesoscale eddies on sea surface temperature (SST) and air-sea turbulent latent and sensible fluxes, or simply, turbulent heat fluxes (THFs), in the North Indian Ocean. On average, eddy-induced THF feedback can approach ∼40 W m−2 k−1 for warm-core anticyclones
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Loop Current Eddies as a Possible Cause of the Rapid Sea Level Rise in the Gulf of Mexico J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-06 Gabriel Thirion, Florence Birol, Julien Jouanno
The Gulf of Mexico (GOM), with its densely populated coastline, is one of the world's most vulnerable regions to climate change and sea level (SL) rise. Over the last three decades, various works have been conducted to assess coastal SL trends around the basin using tide gauge stations, separately from studies dealing with regional dynamical processes. Using altimetry, Argo, and eddy atlas products
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East Australian Current System: Frontal Barrier and Fine-Scale Control of Chlorophyll-a Distribution J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-06 Natacha Bourg, Amandine Schaeffer, Anne Molcard
The East Australian Current (EAC), as the western boundary current of the South Pacific Gyre, governs the mesoscale circulation dynamics along the East Coast of Australia. It also exhibits meandering and instabilities that generate fine-scale structures. Understanding the interplay between these fine-scale processes and the larger-scale EAC patterns is crucial in regards to chlorophyll-a distribution
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Variability of Eddy Kinetic Energy in the Eurasian Basin of the Arctic Ocean Inferred From a Model Simulation at 1-km Resolution J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-05 Vasco Müller, Qiang Wang, Nikolay Koldunov, Sergey Danilov, Dmitry Sidorenko, Thomas Jung
Mesoscale eddies play an important role in driving the dynamics of the Arctic Ocean. Understanding their behavior is crucial for comprehending the ongoing changes in the region. In this study, by using a novel decade-long simulation at 1 km resolution with the unstructured-mesh Finite volumE Sea ice-Ocean Model, we evaluate the spatial and temporal variability of eddy kinetic energy in the Eurasian
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Influence of Physical Factors on Restratification of the Upper Water Column in Antarctic Coastal Polynyas J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-03 Yilang Xu, Weifeng (Gordon) Zhang, Ted Maksym, Rubao Ji, Yun Li, Catherine Walker
Antarctic coastal polynyas are hotspots of biological production with intensive springtime phytoplankton blooms that strongly depend on meltwater-induced restratification in the upper part of the water column. However, the fundamental physics that determine spatial inhomogeneity of the spring restratification remain unclear. Here, we investigate how different meltwaters affect springtime restratification
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The Ocean's Meridional Oxygen Transport J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-03-04 Esther Portela, Nicolas Kolodziejczyk, Thomas Gorgues, Jan Zika, Coralie Perruche, Alexandre Mignot
Quantification of oxygen uptake at the ocean surface and its surface-to-interior pathways is crucial for understanding oxygen concentration change in a warming ocean. We investigate the mean meridional global oxygen transport between 1950 and 2009 using coupled physical-biogeochemical model output. We introduce a streamfunction in latitude-oxygen coordinates to reduce complexity in the description
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Submesoscale Dynamics in the Bay of Bengal: Inversions and Instabilities J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-29 Taylor McKie, Andrew J. Lucas, Jennifer MacKinnon
High resolution shipboard observations reveal the complex processes controlling the evolution and subduction of a cold and salty, dense filament in the Bay of Bengal (BoB). The filament, likely formed through coastal upwelling, was advected offshore by the mesoscale velocity field, and was brought adjacent to a shallow, low salinity mixed layer by mesoscale strain. The front that formed on the Eastern
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Influence of Lee Wave Breaking on Far-Field Mixing in the Deep Ocean J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-29 Kaiwen Zheng, Zhiwei Zhang, Zhibin Yang, Hui Sun, Shoude Guan, Xiaodong Huang, Chun Zhou, Wei Zhao, Jiwei Tian
Breaking of internal lee waves generated by flow-topography interaction is an important driving mechanism for abyssal mixing. By assuming that lee-wave-driven mixing is a local process, direct measurements in the past mainly focused on the water column over rough topography. In this study, a non-local role of lee waves on remote mixing is investigated by using mooring observations in the northwestern
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Formation and Variability of Barrier Layer in the South Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-29 Jindong Jiang, Jiuxin Shi, Yaohua Zhu, Zexun Wei
The oceanic barrier layer (BL), dominated by salinity stratification, plays an important role in regulating heat exchange between the mixed layer and the interior ocean. However, the salinity contribution is ignored or underestimated when analyses relying only on temperature threshold methods. Here we introduce the Turner Angle method to quantify the salinity contribution and to obtain relatively accurate
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Turbulent Diffusivity Profiles on the Shelf and Slope at the Southern Edge of the Canada Basin J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-28 Ruby Yee, Ruth Musgrave, Elizabeth Fine, Jonathan Nash, Louis St. Laurent, Robert Pickart
Vertical profiles of temperature microstructure at 95 stations were obtained over the Beaufort shelf and shelfbreak in the southern Canada Basin during a November 2018 research cruise. Two methods for estimating the dissipation rates of temperature variance and turbulent kinetic energy were compared using this data set. Both methods require fitting a theoretical spectrum to observed temperature gradient
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Eddy-Mediated Turbulent Mixing of Oxygen in the Equatorial Pacific J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Yassir A. Eddebbar, Daniel B. Whitt, Ariane Verdy, Matthew R. Mazloff, Aneesh C. Subramanian, Matthew C. Long
In the tropical Pacific, weak ventilation and intense microbial respiration at depth give rise to a low dissolved oxygen (O2) environment that is thought to be ventilated primarily by the equatorial current system (ECS). The role of mesoscale eddies and vertical mixing as potential pathways of O2 supply in this region, however, remains poorly known due to sparse observations and coarse model resolution
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Variability of Fine-Scale Chlorophyll Fronts in the Tīpaka Moana Te Moananui ā Toi Hauraki Gulf, Aotearoa New Zealand J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Alexandre Lhériau-Nice, Alice Della Penna
Aotearoa New Zealand's marine environment is heavily impacted by El Niño Southern Oscillation (ENSO). Little is known about the effect of ENSO on oceanographic properties in the area or their consequences on the distribution of marine organisms. Here we characterize the spatio-temporal variability of fine-scale fronts (<10 km) in the area of the Tīpaka Moana Te Moananui ā Toi Hauraki Gulf (HG) and
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Physical and Biogeochemical Properties of California Current Upwelled Source Waters J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Jerome Fiechter, Andrew M. Moore
Coastal upwelling variability in the California Current region, one of the four main eastern boundary current upwelling systems, is controlled by processes acting over a wide range of spatial and temporal scales. While the ensuing ecosystem response depends strongly on upwelled water properties, determining their exact physical and biogeochemical characteristics is notoriously difficult as it requires
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Role of Intersecting Equatorial and Coastal Waveguides Near Sri Lanka on Intraseasonal Sea Level Variability Along the West Coast of India J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Iyyappan Suresh, Jérôme Vialard, Takeshi Izumo, Matthieu Lengaigne
The sea level variations along the west coast of India (WCI) significantly affect the ecosystems and fisheries, because of their tight coupling with the oxycline depths in this region, which hosts the world's largest natural hypoxic system. Here, we investigate the main causes of the WCI sea level variability. Using idealized experiments with a linear, continuously stratified ocean model, we first
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Modulation of Western South Atlantic Marine Heatwaves by Meridional Ocean Heat Transport J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Marlos Goes, Shenfu Dong, Gregory R. Foltz, Gustavo Goni, Denis L. Volkov, Ilana Wainer
Marine heatwaves and cold spells are extreme surface temperature events that have been associated with adverse societal and ecosystem impacts in several regions around the globe. Predicting these events presents a challenge because of their generally short-lived nature and dependence on air-sea interactions, both locally and remotely. Here we analyze oceanic propagating features that promote the occurrence
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Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Nathan P. Shunk, Piero L. F. Mazzini, Ryan K. Walter
Subsurface impacts associated with Marine Heatwaves (MHWs) in estuaries are not well understood, largely due to data scarcity. Using over three decades (1986–2021) of observations from several monitoring programs, this study investigates subsurface temperature and dissolved oxygen (DO) anomalies associated with surface MHWs in the Chesapeake Bay (CB). Seasonal variability in temperature anomalies followed
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Trace and Rare Earth Element Fingerprints of Aerobic Oxidation of Methane in Seep-Dwelling Bivalves J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-26 Yuedong Sun, Pengfei Di, Jörn Peckmann, Junxi Feng, Chunhui Tao, Weifang Yang, Duofu Chen, Niu Li
Aerobic methanotrophic bacteria are pivotal in the global carbon cycle by converting methane into biomass and inorganic carbon species. Light rare earth elements (light-REE; La, Ce) are part of the metalloenzymes mediating the biochemical processes in methanotrophs. However, the partitioning of trace metals and REE in chemosymbiotic megafauna with methanotrophic endosymbionts remains largely unknown
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Feedbacks Between Estuarine Metabolism and Anthropogenic CO2 Accelerate Local Rates of Ocean Acidification and Hasten Threshold Exceedances J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27 Stephen R. Pacella, Cheryl A. Brown, Rochelle G. Labiosa, Burke Hales, T. Chris Mochon Collura, Wiley Evans, George G. Waldbusser
Attribution of the ocean acidification (OA) signal in estuarine carbonate system observations is necessary for quantifying the impacts of global anthropogenic CO2 emissions on water quality, and informing managers of the efficacy of potential mitigation options. We present an analysis of observational data to characterize dynamics and drivers of seasonal carbonate system variability in two seagrass
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Issue Information J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-27
No abstract is available for this article.
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Intrinsic Versus Wind-Forced Great Whirl Non-Seasonal Variability J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-23 Kwatra Sadhvi, Iyyappan Suresh, Matthieu Lengaigne, Takeshi Izumo, Thierry Penduff, Jean-Marc Molines, Aftab A. Can, Jérôme Vialard
The Great Whirl (GW) is a quasi-permanent anticyclonic eddy that appears every summer monsoon offshore of the Somalia upwelling. The annual cycle of the GW is well described, but deviations from its mean seasonal cycle (hereafter non-seasonal variability) have been less explored. Satellite observations reveal that the leading mode of summer non-seasonal sea-level variability in this region is associated
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Turbulence Across the Antarctic Circumpolar Current in the Indian Southern Ocean: Micro-Temperature Measurements and Finescale Parameterizations J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-23 Yusuke Sasaki, Ichiro Yasuda, Katsuro Katsumata, Shinya Kouketsu, Hiroshi Uchida
Turbulence structures across the Antarctic circumpolar current (ACC) in the Indian Ocean at around 50°E were revealed using microstructure measurements. Depth-averaged turbulent energy dissipation rates (ε) in 320 m segments estimated using a conductivity-temperature-depth (CTD)-attached micro-temperature fast-response thermistor (FP07) were well reproduced using existing finescale parameterizations
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Elucidating Dissolved Organic Sulfur in the Coastal Environment by Improved Online Liquid Chromatography Coupled to FT-ICR Mass Spectrometry J. Geophys. Res. Oceans (IF 3.6) Pub Date : 2024-02-21 Shuang Chen, Yulin Qi, Qiaorong Xie, Chao Ma, Shujun Zhong, Libin Wu, Pingqing Fu
Dissolved organic sulfur (DOS) is an important component of dissolved organic matter (DOM) and widely exists at the land-atmosphere interface. However, the characterization of DOS at the molecular level among different environmental samples in coastal regions has not been sufficiently focused. Here, we investigated DOS in aerosol, rainwater, and river water samples in Shanghai using an improved method–online