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  1. Article ; Online: Underestimation of oceanic carbon uptake in the Arctic Ocean

    B. Richaud / K. Fennel / E. C. J. Oliver / M. D. DeGrandpre / T. Bourgeois / X. Hu / Y. Lu

    The Cryosphere, Vol 17, Pp 2665-

    ice melt as predictor of the sea ice carbon pump

    2023  Volume 2680

    Abstract: The Arctic Ocean is generally undersaturated in CO 2 and acts as a net sink of atmospheric CO 2 . This oceanic uptake is strongly modulated by sea ice, which can prevent air–sea gas exchange and has major impacts on stratification and primary production. ...

    Abstract The Arctic Ocean is generally undersaturated in CO 2 and acts as a net sink of atmospheric CO 2 . This oceanic uptake is strongly modulated by sea ice, which can prevent air–sea gas exchange and has major impacts on stratification and primary production. Moreover, carbon is stored in sea ice with a ratio of alkalinity to dissolved inorganic carbon that is larger than in seawater. It has been suggested that this storage amplifies the seasonal cycle of seawater p CO 2 and leads to an increase in oceanic carbon uptake in seasonally ice-covered regions compared to those that are ice-free. Given the rapidly changing ice scape in the Arctic Ocean, a better understanding of the link between the seasonal cycle of sea ice and oceanic uptake of CO 2 is needed. Here, we investigate how the storage of carbon in sea ice affects the air–sea CO 2 flux and quantify its dependence on the ratio of alkalinity to inorganic carbon in ice. To this end, we present two independent approaches: a theoretical framework that provides an analytical expression of the amplification of carbon uptake in seasonally ice-covered oceans and a simple parameterization of carbon storage in sea ice implemented in a 1D physical–biogeochemical ocean model. Sensitivity simulations show a linear relation between ice melt and the amplification of seasonal carbon uptake. A 30 % increase in carbon uptake in the Arctic Ocean is estimated compared to ice melt without amplification. Applying this relationship to different future scenarios from an earth system model that does not account for the effect of carbon storage in sea ice suggests that Arctic Ocean carbon uptake is underestimated by 5 % to 15 % in these simulations.
    Keywords Environmental sciences ; GE1-350 ; Geology ; QE1-996.5
    Language English
    Publishing date 2023-07-01T00:00:00Z
    Publisher Copernicus Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Canada's marine carbon sink

    P.J. Duke / B. Richaud / R. Arruda / J. Länger / K. Schuler / P. Gooya / M.M.M. Ahmed / M.R. Miller / C.A. Braybrook / K. Kam / R. Piunno / Y. Sezginer / G. Nickoloff / A.C. Franco

    FACETS, Vol 8, Iss , Pp 1-

    an early career perspective on the state of research and existing knowledge gaps

    2023  Volume 21

    Abstract: Improving our understanding of how the ocean absorbs carbon dioxide is critical to climate change mitigation efforts. We, a group of early career ocean professionals working in Canada, summarize current research and identify steps forward to improve our ... ...

    Abstract Improving our understanding of how the ocean absorbs carbon dioxide is critical to climate change mitigation efforts. We, a group of early career ocean professionals working in Canada, summarize current research and identify steps forward to improve our understanding of the marine carbon sink in Canadian national and offshore waters. We have compiled an extensive collection of reported surface ocean air–sea carbon dioxide exchange values within each of Canada's three adjacent ocean basins. We review the current understanding of air–sea carbon fluxes and identify major challenges limiting our understanding in the Pacific, the Arctic, and the Atlantic Ocean. We focus on ways of reducing uncertainty to inform Canada's carbon stocktake, establish baselines for marine carbon dioxide removal projects, and support efforts to mitigate and adapt to ocean acidification. Future directions recommended by this group include investing in maturing and building capacity in the use of marine carbon sensors, improving ocean biogeochemical models fit-for-purpose in regional and ocean carbon dioxide removal applications, creating transparent and robust monitoring, verification, and reporting protocols for marine carbon dioxide removal, tailoring community-specific approaches to co-generate knowledge with First Nations, and advancing training opportunities for early career ocean professionals in marine carbon science and technology.
    Keywords early career ; future research ; oceans ; ocean carbon flux ; marine carbon cycle ; ocean biogeochemistry ; Education ; L ; Science ; Q
    Subject code 551 ; 333
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher Canadian Science Publishing
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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