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The Weddell Gyre, Southern Ocean: Present knowledge and future challenges

TitleThe Weddell Gyre, Southern Ocean: Present knowledge and future challenges
Publication TypeJournal Article
Year of Publication2019
AuthorsVernet M, Geibert W., Hoppema M., Brown P.J, Haas C., Hellmer H.H, Jokat W., Jullion L., Mazloff M., Bakker D.CE, Brearley J.A, Croot P., Hattermann T., Hauck J., Hillenbrand C.D, Hoppe C.JM, Huhn O., Koch B.P, Lechtenfeld O.J, Meredith M.P, Garabato A.CN, Nothig E.M, Peeken I., van der Loeff M.MR, Schmidtko S., Schroder M., Strass V.H, Torres-Valdes S., Verdy A.
Date Published2019/09
Type of ArticleReview
ISBN Number8755-1209
Accession NumberWOS:000492796700001
Keywordsantarctic sea-ice; antarctica; atlantic sector; austral summer; bottom-water; circumpolar deep-water; dissolved organic-matter; fecal pellet production; Geochemistry & Geophysics; long-termsampling; oceanography; Regional models; seasonal variability; silverfish pleuragramma-antarcticum; trough-mouth fan; Weddell Gyre; weddell sea

The Weddell Gyre (WG) is one of the main oceanographic features of the Southern Ocean south of the Antarctic Circumpolar Current which plays an influential role in global ocean circulation as well as gas exchange with the atmosphere. We review the state-of-the art knowledge concerning the WG from an interdisciplinary perspective, uncovering critical aspects needed to understand this system's role in shaping the future evolution of oceanic heat and carbon uptake over the next decades. The main limitations in our knowledge are related to the conditions in this extreme and remote environment, where the polar night, very low air temperatures, and presence of sea ice year-round hamper field and remotely sensed measurements. We highlight the importance of winter and under-ice conditions in the southern WG, the role that new technology will play to overcome present-day sampling limitations, the importance of the WG connectivity to the low-latitude oceans and atmosphere, and the expected intensification of the WG circulation as the westerly winds intensify. Greater international cooperation is needed to define key sampling locations that can be visited by any research vessel in the region. Existing transects sampled since the 1980s along the Prime Meridian and along an East-West section at similar to 62 degrees S should be maintained with regularity to provide answers to the relevant questions. This approach will provide long-term data to determine trends and will improve representation of processes for regional, Antarctic-wide, and global modeling efforts-thereby enhancing predictions of the WG in global ocean circulation and climate.

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