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Quantifying the Drivers of Ocean-Atmosphere CO₂ Fluxes
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Dependence of the ocean-atmosphere partitioning of carbon on temperature and alkalinity
Published 2018“…We develop and extend a theoretical framework to analyze the impacts of changes in temperature and alkalinity on the ocean-atmosphere carbon partitioning. When investigating the impact of temperature, we assume that there is no change in the global ocean alkalinity. …”
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Wind-driven changes in Southern Ocean residual circulation, ocean carbon reservoirs and atmospheric CO[subscript 2]
Published 2015“…A positive correlation is obtained between the meridional overturning or residual circulation in the Southern Ocean and atmospheric CO[subscript 2]: stronger or northward-shifted westerly winds in the Southern Hemisphere result in increased residual circulation, greater upwelling of carbon-rich deep waters and oceanic outgassing, which increases atmospheric pCO[subscript 2] by ~20 μatm; weaker or southward-shifted winds lead to the opposing result. …”
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Is AOU a good measure of respiration in the oceans?
Published 2017“…Apparent Oxygen Utilization (AOU) is widely used to infer respiration in the oceans by assuming that surface oxygen concentration is close to saturation with the overlying atmosphere. However, significant disequilibrium of oxygen has been observed in high latitude surface oceans where the deep waters are formed. …”
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An analysis of the carbon balance of the Arctic Basin from 1997 to 2006
Published 2014“…This study used several model-based tools to analyse the dynamics of the Arctic Basin between 1997 and 2006 as a linked system of land-ocean-atmosphere C exchange. The analysis estimates that terrestrial areas of the Arctic Basin lost 62.9 Tg C yr[superscript -1] and that the Arctic Ocean gained 94.1 Tg C yr[superscript -1]. …”
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On the potential role of marine calcifiers in glacial-interglacial dynamics: CALCIFIERS AND GLACIAL DYNAMICS
Published 2020“…Ice core measurements have revealed a highly asymmetric cycle in Antarctic temperature and atmospheric CO2 over the last 800 kyr. Both CO 2 and temperature decrease over 100 kyr going into a glacial period and then rise steeply over less than 10 kyr at the end of a glacial period. …”
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Multiple regimes of air-sea carbon partitioning identified from constant-alkalinity buffer factors
Published 2018“…Numerical studies have indicated that the steady-state ocean-atmosphere partitioning of carbon will change profoundly as emissions continue. …”
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Changes in the Arctic Ocean CO
Published 2018“…We use a regional physical-biogeochemical model of the Arctic Ocean, forced by the National Centers for Environmental Prediction/National Center for Atmospheric Research atmospheric reanalysis, to evaluate the mean present-day CO[subscript 2] sink and its temporal evolution. …”
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On nitrogen fixation and preferential remineralization of phosphorus
Published 2018“…However the patterns of this tracer reflect the influence of numerous processes including nitrogen fixation, denitrification, remineralization of organic matter, variable stoichiometry, atmospheric deposition and physical transport. Here we have used idealized models to illustrate how preferential remineralization of organic phosphorous may explain observed features of N* distribution in the North Atlantic Ocean, including a subsurface maximum and an increased temporal variability in the mid-thermocline. …”
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A flux‐based threshold for anaerobic activity in the ocean
Published 2021“…Anaerobic microbial activity in the ocean causes losses of bioavailable nitrogen and emission of nitrous oxide to the atmosphere, but its predictability at global scales remains limited. …”
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Modeling Ocean Ecosystems: The PARADIGM Program
Published 2012“…This is a daunting but exciting challenge, because the ocean-atmosphere system is dynamically linked, and oceanic habitats are both diverse and complex, providing tremendous variety in environmental conditions and associated life forms. …”
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Anthropogenic Asian aerosols provide Fe to the North Pacific Ocean
Published 2021“…Fossil-fuel emissions may impact phytoplankton primary productivity and carbon cycling by supplying bioavailable Fe to remote areas of the ocean via atmospheric aerosols. However, this pathway has not been confirmed by field observations of anthropogenic Fe in seawater. …”
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Interannual variability of the air-sea flux of oxygen in the North Atlantic
Published 2017“…In studies using timeseries observations of atmospheric O[subscript 2]/N[subscript 2] to infer the fate of fossil fuel CO[subscript 2], it has been assumed that multi-year trends in observed O[subscript 2]/N[subscript 2] are insensitive to interannual variability in air-sea fluxes of oxygen. …”
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How have recent temperature changes affected the efficiency of ocean biological carbon export?
Published 2018“…The ocean's large, microbially mediated reservoirs of carbon are intimately connected with atmospheric CO2 and climate, yet quantifying the feedbacks between them remains an unresolved challenge. …”
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Metabolic evolution and the self-organization of ecosystems
Published 2017“…We discuss the implications of this framework for the evolution of Earth's biogeochemical cycles and the rise of atmospheric oxygen.…”
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Dynamic macromolecular composition and high exudation rates in Prochlorococcus
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