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  1. Article ; Online: High interannual surface p CO 2 variability in the southern Canadian Arctic Archipelago's Kitikmeot Sea

    R. P. Sims / M. M. M. Ahmed / B. J. Butterworth / P. J. Duke / S. F. Gonski / S. F. Jones / K. A. Brown / C. J. Mundy / W. J. Williams / B. G. T. Else

    Ocean Science, Vol 19, Pp 837-

    2023  Volume 856

    Abstract: Warming of the Arctic due to climate change means the Arctic Ocean is now free from ice for longer, as sea ice melts earlier and refreezes later. Yet, it remains unclear how this extended ice-free period will impact carbon dioxide (CO 2 ) fluxes due to ... ...

    Abstract Warming of the Arctic due to climate change means the Arctic Ocean is now free from ice for longer, as sea ice melts earlier and refreezes later. Yet, it remains unclear how this extended ice-free period will impact carbon dioxide (CO 2 ) fluxes due to scarcity of surface ocean CO 2 measurements. Baseline measurements are urgently needed to understand spatial and temporal air–sea CO 2 flux variability in the changing Arctic Ocean. There is also uncertainty as to whether the previous basin-wide surveys are representative of the many smaller bays and inlets that make up the Canadian Arctic Archipelago (CAA). By using a research vessel that is based in the remote Inuit community of Ikaluqtuutiak (Cambridge Bay, Nunavut), we have been able to reliably survey p CO 2 shortly after ice melt and access previously unsampled bays and inlets in the nearby region. Here we present 4 years of consecutive summertime p CO 2 measurements collected in the Kitikmeot Sea in the southern CAA. Overall, we found that this region is a sink for atmospheric CO 2 in August (average of all calculated fluxes over the four cruises was − 4.64 mmol m −2 d −1 ), but the magnitude of this sink varies substantially between years and locations (average calculated fluxes of + 3.58, − 2.96, − 16.79 and − 0.57 mmol m −2 d −1 during the 2016, 2017, 2018 and 2019 cruises, respectively). Surface ocean p CO 2 varied by up to 156 µ atm between years, highlighting the importance of repeat observations in this region, as this high interannual variability would not have been captured by sparse and infrequent measurements. We find that the surface ocean p CO 2 value at the time of ice melt is extremely important in constraining the magnitude of the air–sea CO 2 flux throughout the ice-free season. However, further constraining the air–sea CO 2 flux in the Kitikmeot Sea will require a better understanding of how p CO 2 changes outside of the summer season. Surface ocean p CO 2 measurements made in small bays and inlets of the Kitikmeot Sea were ∼ 20–40 µ atm ...
    Keywords Geography. Anthropology. Recreation ; G ; Environmental sciences ; GE1-350
    Language English
    Publishing date 2023-06-01T00:00:00Z
    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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