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Nitrogen Cycling Feedback on Carbon Dynamics Leads to Greater CH4 Emissions and Weaker Cooling Effect of Northern Peatlands Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-27 Bailu Zhao, Qianlai Zhuang
Northern peatlands have been a carbon sink since their initiation. This has been simulated by existing process-based models. However, most of these models are limited by lacking sufficient processes of the N cycle in peatlands. Here, we use a peatland biogeochemistry model incorporated with N-related processes of fixation, deposition, gas emission, loss through water flow, net mineralization, plant
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Overwinter and Spring Thaw Nitrous Oxide Fluxes in a Northern Prairie Cropland Are Limited but a Significant Proportion of Annual Emissions Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-27 Claudia Wagner-Riddle, Kate A. Congreves, Shannon E. Brown, Warren D. Helgason, Richard E. Farrell
Croplands that experience seasonal soil freezing and thawing have been shown to be significant sources of N2O emissions. Yet, there is a paucity of year-round N2O emission data for one of the most significant crop production regions that seasonally freeze, the Prairies. Here, we present micrometeorological N2O fluxes measured over 4 years in Saskatchewan, Canada, to evaluate the magnitude of freeze-thaw
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The Importance of Riverine Nutrient Supply for the Marine Silica Pump of Arctic Shelves: Evidence From the Laptev Sea Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-27 M. C. F. Debyser, L. Pichevin, R. E. Tuerena, A. Doncila, I. Semiletov, R. S. Ganeshram
Arctic shelves receive a large load of nutrients from Arctic rivers, which play a major role in the biogeochemical cycles of the Arctic Ocean. In this study, we present measurements of dissolved silicon isotopes (δ30Si(OH)4) around the Laptev Sea and surface waters of the Eurasian shelves collected in October 2018 to document terrestrial silicon modifications on shelves and their contribution to the
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-27
No abstract is available for this article.
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Mechanisms Underpinning the Net Removal Rates of Dissolved Organic Carbon in the Global Ocean Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-23 Sinikka T. Lennartz, David P. Keller, Andreas Oschlies, Bernd Blasius, Thorsten Dittmar
With almost 700 Pg of carbon, marine dissolved organic carbon (DOC) stores more carbon than all living biomass on Earth combined. However, the controls behind the persistence and the spatial patterns of DOC concentrations on the basin scale remain largely unknown, precluding quantitative assessments of the fate of this large carbon pool in a changing climate. Net removal rates of DOC along the overturning
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Controls on Polar Southern Ocean Deep Chlorophyll Maxima: Viewpoints From Multiple Observational Platforms Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-23 Philip W. Boyd, David Antoine, Kimberley Baldry, Marin Cornec, Michael Ellwood, Svenja Halfter, Leo Lacour, Pauline Latour, Robert F. Strzepek, Thomas W. Trull, Tyler Rohr
Deep Chlorophyll Maxima (DCMs) are ubiquitous in low-latitude oceans, and of recognized biogeochemical and ecological importance. DCMs have been observed in the Southern Ocean, initially from ships and recently from profiling robotic floats, but with less understanding of their onset, duration, underlying drivers, or whether they are associated with enhanced biomass features. We report the characteristics
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Mechanistic Constraints on the Drivers of Southern Ocean Meridional Iron Distributions Between Tasmania and Antarctica Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-21 Christopher D. Traill, Paula Conde-Pardo, Tyler Rohr, Pier van der Merwe, Ashley T. Townsend, Pauline Latour, Melanie Gault-Ringold, Kathrin Wuttig, Matthew Corkill, Thomas M. Holmes, Mark J. Warner, Elizabeth Shadwick, Andrew R. Bowie
While modeling efforts have furthered our understanding of marine iron biogeochemistry and its influence on carbon sequestration, observations of dissolved iron (dFe) and its relationship to physical, chemical and biological processes in the ocean are needed to both validate and inform model parameterization. Where iron comes from, how it is transported and recycled, and where iron removal takes place
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Unraveling the Physical and Biological Controls of the Global Coastal CO2 Sink Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-20 Alizée Roobaert, Laure Resplandy, Goulven G. Laruelle, Enhui Liao, Pierre Regnier
The drivers governing the air-sea CO2 exchange and its variability in the coastal ocean are poorly understood. Using a global ocean biogeochemical model, this study quantifies the influences of thermal changes, oceanic transport, freshwater fluxes, and biological activity on the spatial and seasonal variability of CO2 sources/sinks in the global coastal ocean. We identify five typical coastal behaviors
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Re-Evaluating Hydrogen Sulfide as a Sink for Cadmium and Zinc in the Oxic to Suboxic Upper Water Column of the Pacific Ocean Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-17 N. R. Buckley, E. E. Black, J. A. Kenyon, N. T. Lanning, M. Sieber, T. M. Conway, J. N. Fitzsimmons, G. A. Cutter
Hydrogen sulfide is produced by heterotrophic bacteria in anoxic waters and via carbonyl sulfide hydrolysis and phytoplankton emissions under oxic conditions. Apparent losses of dissolved cadmium (dCd) and zinc (dZn) in oxygen minimum zones (OMZs) of the Atlantic and Pacific Oceans have been attributed to metal-sulfide precipitation formed via dissimilatory sulfate reduction. It has also been argued
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Atypical Seasonality of the Silicon Cycle in the Yellow River Estuary and Bohai Sea Revealed by Stable Silicon Isotopes Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-12 Quanchao Cui, Xiaowen Liu, Zhenyan Wang, Weidong Sun, Yuanyuan Xiao, Xiaole Sun
Biogeochemical Si cycle in coastal areas is of vital importance due to its close link with the carbon cycle. However, the coastal Si cycle has been heavily perturbated by human activities. In this study, we studied the spatiotemporal distribution of biogenic Si (BSi) and dissolved Si (DSi) combined with stable Si isotopes of DSi (δ30SiDSi) in the Yellow River estuary and Bohai Sea, one of the most
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A 2,000-Year Record of Eelgrass (Zostera marina L.) Colonization Shows Substantial Gains in Blue Carbon Storage and Nutrient Retention Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-11 Martin Dahl, Martin Gullström, Irene Bernabeu, Oscar Serrano, Carmen Leiva-Dueñas, Hans W. Linderholm, Maria E. Asplund, Mats Björk, Tinghai Ou, J. Robin Svensson, Elinor Andrén, Thomas Andrén, Sanne Bergman, Sara Braun, Anneli Eklöf, Zilvinas Ežerinskis, Andrius Garbaras, Petter Hällberg, Elin Löfgren, Malin E. Kylander, Pere Masqué, Justina Šapolaitė, Rienk Smittenberg, Miguel A. Mateo
Assessing historical environmental conditions linked to habitat colonization is important for understanding long-term resilience and improving conservation and restoration efforts. Such information is lacking for the seagrass Zostera marina, an important foundation species across cold-temperate coastal areas of the Northern Hemisphere. Here, we reconstructed environmental conditions during the last
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Integrating Trait-Based Stoichiometry in a Biogeochemical Inverse Model Reveals Links Between Phytoplankton Physiology and Global Carbon Export Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-08 Megan R. Sullivan, François W. Primeau, George I. Hagstrom, Wei-Lei Wang, Adam C. Martiny
The elemental ratios of carbon, nitrogen, and phosphorus (C:N:P) within organic matter play a key role in coupling biogeochemical cycles in the global ocean. At the cellular level, these ratios are controlled by physiological responses to the environment. But linking these cellular-level processes to global biogeochemical cycles remains challenging. We present a novel model framework that combines
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Decreasing Photoreactivity and Concurrent Change in Dissolved Organic Matter Composition With Increasing Inland Water Residence Time Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-07 C. Grasset, K. Einarsdottir, N. Catalán, L. J. Tranvik, M. Groeneveld, J. A. Hawkes, K. Attermeyer
Photochemical degradation of dissolved organic matter (DOM) has been the subject of numerous studies; however, its regulation along the inland water continuum is still unclear. We aimed to unravel the DOM photoreactivity and concurrent DOM compositional changes across 30 boreal aquatic ecosystems including peat waters, streams, rivers, and lakes distributed along a water residence time (WRT) gradient
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-03-07
No abstract is available for this article.
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The Greenhouse Gas Budget of Terrestrial Ecosystems in East Asia Since 2000 Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-02-22 Xuhui Wang, Yuanyi Gao, Sujong Jeong, Akihiko Ito, Ana Bastos, Benjamin Poulter, Yilong Wang, Philippe Ciais, Hanqin Tian, Wenping Yuan, Naveen Chandra, Frédéric Chevallier, Lei Fan, Songbai Hong, Ronny Lauerwald, Wei Li, Zhengyang Lin, Naiqing Pan, Prabir K. Patra, Shushi Peng, Lishan Ran, Yuxing Sang, Stephen Sitch, Maki Takashi, Rona Louise Thompson, Chenzhi Wang, Kai Wang, Tao Wang, Yi Xi, Liang
East Asia (China, Japan, Koreas, and Mongolia) has been the world's economic engine over at least the past two decades, exhibiting a rapid increase in fossil fuel emissions of greenhouse gases (GHGs) and has expressed the recent ambition to achieve climate neutrality by mid-century. However, the GHG balance of its terrestrial ecosystems remains poorly constrained. Here, we present a synthesis of the
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Stream Nitrogen Concentrations Across Arctic Vegetation Gradients Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-02-22 C. M. H. Holmboe, A. Pastor, T. Riis
The Arctic is experiencing dramatic climate-induced changes, which could have substantial consequences for nutrient export from land to streams and, thus, in-stream nutrient availability and composition. Arctic freshwater ecosystems are low-productive systems often limited by nitrogen (N) availability. Studying small streams is important due to their high abundance across the landscape, intimate connection
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Biodegradation of Ancient Organic Carbon Fuels Seabed Methane Emission at the Arctic Continental Shelves Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-02-17 Kehua You
This study explores the carbon stability in the Arctic permafrost following the sea-level transgression since the Last Glacial Maximum (LGM). The Arctic permafrost stores a significant amount of organic carbon sequestered as frozen particulate organic carbon, solid methane hydrate and free methane gas. Post-LGM sea-level transgression resulted in ocean water, which is up to 20°C warmer compared to
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Early Diagenetic Controls on Sedimentary Iodine Release and Iodine-To-Organic Carbon Ratios in the Paleo-Record Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-02-04 Florian Scholz, Dalton S. Hardisty, Andrew W. Dale
Iodine cycling in the ocean is closely linked to productivity, organic carbon export, and oxygenation. However, iodine sources and sinks at the seafloor are poorly constrained, which limits the applicability of iodine as a biogeochemical tracer. We present pore water and solid phase iodine data for sediment cores from the Peruvian continental margin, which cover a range of bottom water oxygen concentrations
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-29
No abstract is available for this article.
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The Influence of Air-Sea CO2 Disequilibrium on Carbon Sequestration by the Ocean's Biological Pump Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-29 Michael Nowicki, Tim DeVries, David A. Siegel
The ocean's biological carbon pump (BCP) affects the Earth's climate by sequestering CO2 away from the atmosphere for decades to millennia. One primary control on the amount of carbon sequestered by the biological pump is air-sea CO2 disequilibrium, which is controlled by the rate of air-sea CO2 exchange and the residence time of CO2 in surface waters. Here, we use a data-assimilated model of the soft
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A Synthesis of Global Coastal Ocean Greenhouse Gas Fluxes Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-20 L. Resplandy, A. Hogikyan, J. D. Müller, R. G. Najjar, H. W. Bange, D. Bianchi, T. Weber, W.-J. Cai, S. C. Doney, K. Fennel, M. Gehlen, J. Hauck, F. Lacroix, P. Landschützer, C. Le Quéré, A. Roobaert, J. Schwinger, S. Berthet, L. Bopp, T. T. T. Chau, M. Dai, N. Gruber, T. Ilyina, A. Kock, M. Manizza, Z. Lachkar, G. G. Laruelle, E. Liao, I. D. Lima, C. Nissen, C. Rödenbeck, R. Séférian, K. Toyama, H
The coastal ocean contributes to regulating atmospheric greenhouse gas concentrations by taking up carbon dioxide (CO2) and releasing nitrous oxide (N2O) and methane (CH4). In this second phase of the Regional Carbon Cycle Assessment and Processes (RECCAP2), we quantify global coastal ocean fluxes of CO2, N2O and CH4 using an ensemble of global gap-filled observation-based products and ocean biogeochemical
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Cycling Rates of Particulate Organic Carbon Along the GEOTRACES Pacific Meridional Transect GP15 Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-16 Vinícius J. Amaral, Phoebe J. Lam, Olivier Marchal, Jennifer A. Kenyon
Understanding particle cycling processes in the ocean is critical for predicting the response of the biological carbon pump to external perturbations. Here, measurements of particulate organic carbon (POC) concentration in two size fractions (1–51 and >51 μm) from GEOTRACES Pacific meridional transect GP15 are combined with a POC cycling model to estimate rates of POC production, (dis)aggregation,
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Drivers of Air-Sea CO2 Flux in the Subantarctic Zone Revealed by Time Series Observations Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-12 Xiang Yang, Cathryn A. Wynn-Edwards, Peter G. Strutton, Elizabeth H. Shadwick
The subantarctic zone is an important region in the Southern Ocean with respect to its influence on air-sea CO2 exchange and the global ocean carbon cycle. However, understanding of the magnitude and drivers of the flux are still being refined. Using observations from the Southern Ocean Time Series (SOTS) station (∼47°S, 142°E) and auxiliary data, we developed a multiple linear regression model to
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A Circum-Antarctic Plankton Isoscape: Carbon Export Potential Across the Summertime Southern Ocean Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-12 Luca Stirnimann, Thomas G. Bornman, Heather J. Forrer, Joshua Mirkin, Thomas J. Ryan-Keogh, Raquel F. Flynn, Rosemary A. Dorrington, Hans M. Verheye, Sarah E. Fawcett
The Southern Ocean accounts for ∼30% of the ocean's CO2 sink, partly due to its biological pump that transfers surface-produced organic carbon to deeper waters. To estimate large-scale Southern Ocean carbon export potential and characterize its drivers, we measured the carbon and nitrogen isotope ratios of surface suspended particulate matter (δ13CSPM, δ15NSPM) for samples collected in summer 2016/2017
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The Role of Coastal Yedoma Deposits and Continental Shelf Sediments in the Arctic Ocean Silicon Cycle Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2024-01-09 Nicholas E. Ray, Jannik Martens, Marco Ajmar, Tommaso Tesi, Evgeniy Yakushev, Ivan Gangnus, Jens Strauss, Lutz Schirrmeister, Igor Semiletov, Birgit Wild
The availability of silicon (Si) in the ocean plays an important role in regulating biogeochemical and ecological processes. The Si budget of the Arctic Ocean appears balanced, with inputs equivalent to outputs, though it is unclear how a changing climate might aggravate this balance. In this study, we focus on Si cycling in Arctic coastal areas and continental shelf sediments to better constrain the
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-27
No abstract is available for this article.
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Coral Reef Carbonate Chemistry Reveals Interannual, Seasonal, and Spatial Impacts on Ocean Acidification Off Florida Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-26 A. M. Palacio-Castro, I. C. Enochs, N. Besemer, A. Boyd, M. Jankulak, G. Kolodziej, H. K. Hirsh, A. E. Webb, E. K. Towle, C. Kelble, I. Smith, D. P. Manzello
Ocean acidification (OA) threatens coral reef persistence by decreasing calcification and accelerating the dissolution of reef frameworks. The carbonate chemistry of coastal areas where many reefs exist is strongly influenced by the metabolic activity of the underlying benthic community, contributing to high spatiotemporal variability. While characterizing this variability is difficult, it has important
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Neutral Tropical African CO2 Exchange Estimated From Aircraft and Satellite Observations Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-21 Benjamin Gaubert, Britton B. Stephens, David F. Baker, Sourish Basu, Michael Bertolacci, Kevin W. Bowman, Rebecca Buchholz, Abhishek Chatterjee, Frédéric Chevallier, Róisín Commane, Noel Cressie, Feng Deng, Nicole Jacobs, Matthew S. Johnson, Shamil S. Maksyutov, Kathryn McKain, Junjie Liu, Zhiqiang Liu, Eric Morgan, Chris O’Dell, Sajeev Philip, Eric Ray, David Schimel, Andrew Schuh, Thomas E. Taylor
Tropical lands play an important role in the global carbon cycle yet their contribution remains uncertain owing to sparse observations. Satellite observations of atmospheric carbon dioxide (CO2) have greatly increased spatial coverage over tropical regions, providing the potential for improved estimates of terrestrial fluxes. Despite this advancement, the spread among satellite-based and in-situ atmospheric
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Climatic Changes in North Atlantic O2 Amplified by Temperature Sensitivity of Phytoplankton Growth Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-22 A. Margolskee, T. Ito, M. Long, C. Deutsch
Ocean warming is associated with a decline in the global oxygen (O2) inventory, but the ratio of O2 loss to heat gain is poorly understood. We analyzed historical variability in temperature (T), O2, and nitrate N O 3 − $\left(\mathrm{N}{\mathrm{O}}_{3}^{-}\right)$ in hydrographic observations and model simulations of the North Atlantic, a relatively well-sampled region that is important for deep ocean
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Water Stress Dominates 21st-Century Tropical Land Carbon Uptake Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-19 Paul A. Levine, A. Anthony Bloom, Kevin W. Bowman, John T. Reager, John R. Worden, Junjie Liu, Nicholas C. Parazoo, Victoria Meyer, Alexandra G. Konings, Marcos Longo
Water stress regulates land-atmosphere carbon dioxide (CO2) exchanges in the tropics; however, its role remains poorly characterized due to the confounding roles of radiation, temperature and canopy dynamics. In particular, uncertainty stems from the relative roles of plant-available water (supply) and atmospheric water vapor deficit (demand) as mechanistic drivers of photosynthetic carbon (C) uptake
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Isotope Constraints on Nitrate Exchanges Between Precipitation and Forest Canopy Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-15 Xue-Yan Liu, Mei-Na Liu, Wan-Xiao Qin, Wei Song
Atmospheric nitrogen (N) deposition is a key process influencing plant-soil N processes and associated functions of forest ecosystems. However, the N deposition into soils based on open-field precipitation observations remains inaccurate due to the unconstrained precipitation-canopy N exchanges, which prevents a better evaluation of N deposition effects on forest N cycles and functions. Nitrate (N
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Authigenic Iron Is a Significant Component of Oceanic Labile Particulate Iron Inventories Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-14 Laura E. Sofen, Olga A. Antipova, Kristen N. Buck, Salvatore Caprara, Lauren Chacho, Rodney J. Johnson, Gabriella Kim, Peter Morton, Daniel C. Ohnemus, Sara Rauschenberg, Peter N. Sedwick, Alessandro Tagliabue, Benjamin S. Twining
Particulate phases transport trace metals (TM) and thereby exert a major control on TM distribution in the ocean. Particulate TMs can be classified by their origin as lithogenic (crustal material), biogenic (cellular), or authigenic (formed in situ), but distinguishing these fractions analytically in field samples is a challenge often addressed using operational definitions and assumptions. These different
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A Comprehensive Assessment of Anthropogenic and Natural Sources and Sinks of Australasia's Carbon Budget Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-08 Yohanna Villalobos, Josep G. Canadell, Elizabeth D. Keller, Peter R. Briggs, Beata Bukosa, Donna L. Giltrap, Ian Harman, Timothy W. Hilton, Miko U. F. Kirschbaum, Ronny Lauerwald, Liyin L. Liang, Taylor Maavara, Sara E. Mikaloff-Fletcher, Peter J. Rayner, Laure Resplandy, Judith Rosentreter, Eva-Marie Metz, Oscar Serrano, Benjamin Smith
Regional carbon budget assessments attribute and track changes in carbon sources and sinks and support the development and monitoring the efficacy of climate policies. We present a comprehensive assessment of the natural and anthropogenic carbon (C-CO2) fluxes for Australasia as a whole, as well as for Australia and New Zealand individually, for the period from 2010 to 2019, using two approaches: bottom-up
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Transport of Anthropogenic Carbon From the Antarctic Shelf to Deep Southern Ocean Triggers Acidification Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-06 Shuang Zhang, Yingxu Wu, Wei-Jun Cai, Wenju Cai, Richard A. Feely, Zhaomin Wang, Toste Tanhua, Yanmin Wang, Chengyan Liu, Xichen Li, Qinghua Yang, Minghu Ding, Zhongsheng Xu, Rodrigo Kerr, Yiming Luo, Xiao Cheng, Liqi Chen, Di Qi
Flow of dense shelf water provide an efficient mechanism for pumping CO2 to the deep ocean along the continental shelf slope, particularly around the Antarctic bottom water (AABW) formation areas where much of the global bottom water is formed. However, the contribution of the formation of AABW to sequestering anthropogenic carbon (Cant) and its consequences remain unclear. Here, we show prominent
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Isoprene Production and Its Driving Factors in the Northwest Pacific Ocean Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-05 Jian Wang, Hong-Hai Zhang, Dennis Booge, Yue-Qi Zhang, Xiao-Jun Li, Ying-Cui Wu, Jia-Wei Zhang, Zhao-Hui Chen
Marine isoprene plays a crucial role in the formation of secondary organic aerosol within the remote marine boundary layer. Due to scarce field measurements of oceanic isoprene and limited laboratory-based studies of isoprene production, assessing the importance of marine isoprene on atmospheric chemistry and climate is challenging. Calculating in-field isoprene production rates is a crucial step to
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Processes in the Surface Ocean Regulate Dissolved Organic Matter Distributions in the Deep Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-12-02 Sarah K. Bercovici, Thorsten Dittmar, Jutta Niggemann
Marine dissolved organic matter (DOM) is a major global carbon pool, consisting of thousands of compounds with distinct lifetimes. While marine DOM persists for millennia, its molecular and isotopic composition imply that it is dynamic on shorter timescales. To determine the extent to which DOM deviates from conservative water mass mixing, we conducted a two-endmember mixing analysis on dissolved organic
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Global Patterns of Surface Ocean Dissolved Organic Matter Stoichiometry Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-28 Zhou Liang, Robert T. Letscher, Angela N. Knapp
Surface ocean marine dissolved organic matter (DOM) serves as an important reservoir of carbon (C), nitrogen (N), and phosphorus (P) in the global ocean, and is produced and consumed by both autotrophic and heterotrophic communities. While prior work has described distributions of dissolved organic carbon (DOC) and nitrogen (DON) concentrations, our understanding of DOC:DON:DOP stoichiometry in the
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-28
No abstract is available for this article.
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Amplified Subsurface Signals of Ocean Acidification Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-28 Andrea J. Fassbender, Brendan R. Carter, Jonathan D. Sharp, Yibin Huang, Mar C. Arroyo, Hartmut Frenzel
We evaluate the impact of anthropogenic carbon (Cant) accumulation on multiple ocean acidification (OA) metrics throughout the water column and across the major ocean basins using the GLODAPv2.2016b mapped product. OA is largely considered a surface-intensified process caused by the air-to-sea transfer of Cant; however, we find that the partial pressure of carbon dioxide gas (pCO2), Revelle sensitivity
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Depth Variance of Organic Matter Respiration Stoichiometry in the Subtropical North Atlantic and the Implications for the Global Oxygen Cycle Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-28 Skylar D. Gerace, Adam J. Fagan, François W. Primeau, Allison R. Moreno, Paul Lethaby, Rodney J. Johnson, Adam C. Martiny
Climate warming likely drives ocean deoxygenation, but models still cannot fully explain observed declines in oxygen. One unconstrained parameter is the oxygen demand per carbon respired for complete remineralization of organic matter (i.e., the total respiration quotient, rΣ-O2:C). Here, we tested if rΣ-O2:C declined with depth by quantifying suspended concentrations of particulate organic carbon
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Trace Element Geochemistry in North Pacific Red Clay Sediment Porewaters and Implications for Water-Column Studies Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-14 Zvi Steiner, Gilad Antler, William M. Berelson, Peter W. Crockford, Ann G. Dunlea, Yi Hou, Jess F. Adkins, Alexandra V. Turchyn, Eric P. Achterberg
Geochemical analyses of trace elements in the ocean water column have suggested that pelagic clay-rich sediments are a major source of various elements to bottom-waters. However, corresponding high-quality measurements of trace element concentrations in porewaters of pelagic clay-rich sediments are scarce, making it difficult to evaluate the contributions from benthic processes to global oceanic cycles
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Identifying the Most (Cost-)Efficient Regions for CO2 Removal With Iron Fertilization in the Southern Ocean Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-16 Lennart T. Bach, Veronica Tamsitt, Kimberlee Baldry, Jeffrey McGee, Emmanuel C. Laurenceau-Cornec, Robert F. Strzepek, Yinghuan Xie, Philip W. Boyd
Ocean iron fertilization (OIF) aims to remove carbon dioxide (CO2) from the atmosphere by stimulating phytoplankton carbon-fixation and subsequent deep ocean carbon sequestration in iron-limited oceanic regions. Transdisciplinary assessments of OIF have revealed overwhelming challenges around the detection and verification of carbon sequestration and wide-ranging environmental side-effects, thereby
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Ecosystem CO2 Exchange and Its Economic Implications in Northern Permafrost Regions in the 21st Century Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-13 Cuicui Mu, Xiaoxiao Mo, Yuan Qiao, Yating Chen, Yuguo Wei, Mei Mu, Jinyue Song, Zhilong Li, Wenxin Zhang, Xiaoqing Peng, Guofei Zhang, Qianlai Zhuang, Mika Aurela
Climate warming increases carbon assimilation by plant growth and also accelerates permafrost CO2 emissions; however, the overall ecosystem CO2 balance in permafrost regions and its economic impacts remain largely unknown. Here we synthesize in situ measurements of net ecosystem CO2 exchange to assess current and future carbon budgets across the northern permafrost regions using the random forest model
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The Southern Ocean Carbon Cycle 1985–2018: Mean, Seasonal Cycle, Trends, and Storage Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-10 Judith Hauck, Luke Gregor, Cara Nissen, Lavinia Patara, Mark Hague, Precious Mongwe, Seth Bushinsky, Scott C. Doney, Nicolas Gruber, Corinne Le Quéré, Manfredi Manizza, Matthew Mazloff, Pedro M. S. Monteiro, Jens Terhaar
We assess the Southern Ocean CO2 uptake (1985–2018) using data sets gathered in the REgional Carbon Cycle Assessment and Processes Project Phase 2. The Southern Ocean acted as a sink for CO2 with close agreement between simulation results from global ocean biogeochemistry models (GOBMs, 0.75 ± 0.28 PgC yr−1) and pCO2-observation-based products (0.73 ± 0.07 PgC yr−1). This sink is only half that reported
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An Assessment of CO2 Uptake in the Arctic Ocean From 1985 to 2018 Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-10 Sayaka Yasunaka, Manfredi Manizza, Jens Terhaar, Are Olsen, Ryohei Yamaguchi, Peter Landschützer, Eiji Watanabe, Dustin Carroll, Hanani Adiwira, Jens Daniel Müller, Judith Hauck
As a contribution to the Regional Carbon Cycle Assessment and Processes phase 2 (RECCAP2) project, we present synthesized estimates of Arctic Ocean sea-air CO2 fluxes and their uncertainties from surface ocean pCO2-observation products, ocean biogeochemical hindcast and data assimilation models, and atmospheric inversions. For the period of 1985–2018, the Arctic Ocean was a net sink of CO2 of 116 ± 4 TgC yr−1
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Environmental Drivers of Coccolithophore Growth in the Pacific Sector of the Southern Ocean Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-09 H. Oliver, D. J. McGillicuddy, K. M. Krumhardt, M. C. Long, N. R. Bates, B. C. Bowler, D. T. Drapeau, W. M. Balch
The Great Calcite Belt (GCB) is a band of high concentrations of suspended particulate inorganic carbon (PIC) spanning the subantarctic Southern Ocean and plays an important role in the global carbon cycle. The key limiting factors controlling coccolithophore growth supporting this high PIC have not yet been well-characterized in the remote Pacific sector, the lowest PIC but largest area of the GCB
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The Role of Glacier Erosion in Riverine Particulate Organic Carbon Export Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-11-01 Megan I. Behnke, Jason B. Fellman, Sonia Nagorski, Robert G. M. Spencer, Eran Hood
Biospheric particulate organic carbon (POCbio) burial and rock petrogenic particulate organic carbon (POCpetro) oxidation are opposing long-term controls on the global carbon cycle, sequestering and releasing carbon, respectively. Here, we examine how watershed glacierization impacts the POC source by assessing the concentration and isotopic composition (δ13C and Δ14C) of POC exported from four watersheds
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Central Role of Nitrogen Fertilizer Relative to Water Management in Determining Direct Nitrous Oxide Emissions From Global Rice-Based Ecosystems Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-30 Hanxiong Song, Qiuan Zhu, Jean-Pierre Blanchet, Zhi Chen, Kerou Zhang, Tong Li, Feng Zhou, Changhui Peng
The increasing atmospheric nitrous oxide (N2O) concentration stems from the development of agriculture. However, N2O emissions from global rice-based ecosystems have not been explicitly and systematically quantified. Therefore, this study aims to estimate the spatiotemporal magnitudes of the N2O emissions from global rice-based ecosystems and determine different contribution factors by improving a
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BioGeoChemical-Argo Floats Reveal Stark Latitudinal Gradient in the Southern Ocean Deep Carbon Flux Driven by Phytoplankton Community Composition Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-27 Louis Terrats, Hervé Claustre, Nathan Briggs, Antoine Poteau, Benjamin Briat, Léo Lacour, Florian Ricour, Antoine Mangin, Griet Neukermans
The gravitational sinking of particles in the mesopelagic layer (∼200–1,000 m) transfers to the deep ocean a part of atmospheric carbon fixed by phytoplankton. This process, called the gravitational pump, exerts an important control on atmospheric CO2 levels but remains poorly characterized given the limited spatio-temporal coverage of ship-based flux measurements. Here, we examined the gravitational
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-26
No abstract is available for this article.
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Macroecology Differentiation Between Bacteria and Fungi in Topsoil Across the United States Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-26 Liyuan He, Nicolas Viovy, Xiaofeng Xu
Bacteria and fungi possess distinct physiological traits. Their macroecology is vital for ecosystem functioning such as carbon cycling. However, bacterial and fungal biogeography and underlying mechanisms remain elusive. In this study, we investigated bacterial versus fungal macroecology by integrating a microbial-explicit model—CLM-Microbe—with measured fungal (FBC) and bacterial biomass carbon (BBC)
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The Contribution of Biotic Factors in Explaining the Global Distribution of Inorganic Carbon in Surface Soils Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-25 Xiao-Min Zeng, Felipe Bastida, César Plaza, Guiyao Zhou, Alfonso Vera, Yu-Rong Liu, Manuel Delgado-Baquerizo
Soil inorganic carbon (SIC) plays a crucial role in regulating global carbon (C) cycling by linking the long-term geological and short-term biological C cycles. Soil inorganic carbon stocks are thought to be mainly driven by abiotic factors. However, despite the well-known influence of vegetation and soil microbes on terrestrial C pools, the relative contribution of biotic and abiotic factors in explaining
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Response of Dissolved Trace Metals to Dust Storms, Sediment Resuspension, and Flash Floods in Oligotrophic Oceans Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-23 T. Benaltabet, G. Lapid, A. Torfstein
Trace metals (TM) delivered by atmospheric dust play a key role in oceanic biogeochemical cycles. However, the impact of short-term environmental perturbations such as dust storms and sediment resuspension events on the oceanic water column is poorly constrained due to the low temporal sampling resolution and episodic nature of these events. The Gulf of Aqaba (GoA), Red Sea, is a highly accessible
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Shifts in the Isotopic Composition of Nitrous Oxide Between El Niño and La Niña in the Eastern Tropical South Pacific Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-19 Noah Gluschankoff, Alyson E. Santoro, Carolyn Buchwald, Karen L. Casciotti
The El Niño-Southern Oscillation (ENSO) is a natural climate phenomenon that alters the biogeochemical and physical dynamics of the Eastern Tropical Pacific Ocean. Its two phases, El Niño and La Niña, are characterized by decreased and increased coastal upwelling, respectively, which have cascading effects on primary productivity, organic matter supply, and ocean-atmosphere interactions. The Eastern
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Global Nitrogen Mass Flux From the Active Freshwater Aquifer Element Pool Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-18 Warren W. Wood, Ward E. Sanford, John A. Cherry, David W. Hyndman, Warren T. Wood
The estimated current global mean nitrogen concentration (geogenic + anthropogenic) in the active continental freshwater aquifer element pool is 1.1 mg/L as N, or between four and five times greater than the assumed geogenic mean. This concentration, combined with groundwater flux, generates a continental mass flux of 17 Tg N/y (teragrams of nitrogen, as N, per year) as a result of direct ocean discharge
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Increased Terrestrial Carbon Export and CO2 Evasion From Global Inland Waters Since the Preindustrial Era Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-10-13 Hanqin Tian, Yuanzhi Yao, Ya Li, Hao Shi, Shufen Pan, Raymond G. Najjar, Naiqing Pan, Zihao Bian, Philippe Ciais, Wei-Jun Cai, Minhan Dai, Marjorie A. M. Friedrichs, Hong-Yi Li, Steven Lohrenz, L. Ruby Leung
Global carbon dioxide (CO2) evasion from inland waters (rivers, lakes, and reservoirs) and carbon (C) export from land to oceans constitute critical terms in the global C budget. However, the magnitudes, spatiotemporal patterns, and underlying mechanisms of these fluxes are poorly constrained. Here, we used a coupled terrestrial–aquatic model to assess how multiple changes in climate, land use, atmospheric
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Issue Information Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-09-28
No abstract is available for this article.
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A Spatial Assessment of Current and Future Foliar Hg Uptake Fluxes Across European Forests Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-09-28 Lena Wohlgemuth, Aryeh Feinberg, Allan Buras, Martin Jiskra
Atmospheric mercury (Hg) is deposited to land surfaces mainly through vegetation uptake. Foliage stomatal gas exchange plays an important role for net vegetation Hg uptake, because foliage assimilates Hg via the stomata. Here, we use empirical relationships of foliar Hg uptake by forest tree species to produce a spatially highly resolved (1 km2) map of foliar Hg fluxes to European forests over one
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Seasonal Tropospheric Distribution and Air-Sea Fluxes of Atmospheric Potential Oxygen From Global Airborne Observations Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-09-27 Yuming Jin, Britton B. Stephens, Ralph F. Keeling, Eric J. Morgan, Christian Rödenbeck, Prabir K. Patra, Matthew C. Long
Seasonal change of atmospheric potential oxygen (APO ∼ O2 + CO2) is a tracer for air-sea O2 flux with little sensitivity to the terrestrial exchange of O2 and CO2. In this study, we present the tropospheric distribution and inventory of APO in each hemisphere with seasonal resolution, using O2 and CO2 measurements from discrete airborne campaigns between 2009 and 2018. The airborne data are represented
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Arctic Permafrost Thawing Enhances Sulfide Oxidation Glob. Biogeochem. Cycles (IF 5.2) Pub Date : 2023-09-22 Preston Cosslett Kemeny, Gen K. Li, Madison Douglas, William Berelson, Austin J. Chadwick, Nathan F. Dalleska, Michael P. Lamb, William Larsen, John S. Magyar, Nick E. Rollins, Joel Rowland, M. Isabel Smith, Mark A. Torres, Samuel M. Webb, Woodward W. Fischer, A. Joshua West
Permafrost degradation is altering biogeochemical processes throughout the Arctic. Thaw-induced changes in organic matter transformations and mineral weathering reactions are impacting fluxes of inorganic carbon (IC) and alkalinity (ALK) in Arctic rivers. However, the net impact of these changing fluxes on the concentration of carbon dioxide in the atmosphere (pCO2) is relatively unconstrained. Resolving