Holocene polynya dynamics and their interaction with oceanic heat transport in northernmost Baffin Bay.

Autor: Jackson R; Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, Copenhagen, Denmark. rjac@geus.dk., Kvorning AB; Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, Copenhagen, Denmark.; Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark., Limoges A; Department of Earth Sciences, University of New Brunswick, 2 Bailey Drive, Fredericton, E3B 5A3, Canada., Georgiadis E; Department of Geography, Durham University, Lower Mountjoy, South Road, DH1 3LE, Durham, UK.; Université Bordeaux, CNRS, EPHE, UMR 5805 EPOC, Allée Geoffroy Saint-Hilaire CS 50023, 33615, Pessac Cedex, France., Olsen SM; Danish Meteorological Institute (DMI), Lyngbyvej 100, 2100, Copenhagen, Denmark., Tallberg P; Faculty of Biological and Environmental Sciences, University of Helsinki, P.O. Box 65, Helsinki, 00014, Finland., Andersen TJ; Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350, Copenhagen, Denmark., Mikkelsen N; Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, Copenhagen, Denmark., Giraudeau J; Université Bordeaux, CNRS, EPHE, UMR 5805 EPOC, Allée Geoffroy Saint-Hilaire CS 50023, 33615, Pessac Cedex, France., Massé G; Station Marine De Concarneau, Place De La Croix, 29900, Concarneau, France.; Université Laval, CNRS, UM 3376 TAKUVIK, Allée de la Médecine, Québec, G1V0A6, Canada., Wacker L; Ion Beam Physics, Physics, Swiss Federal Institute of Technology in Zurich, Otto-Stern-Weg 5, 8093, Zürich, Switzerland., Ribeiro S; Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350, Copenhagen, Denmark.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2021 May 12; Vol. 11 (1), pp. 10095. Date of Electronic Publication: 2021 May 12.
DOI: 10.1038/s41598-021-88517-9
Abstrakt: Baffin Bay hosts the largest and most productive of the Arctic polynyas: the North Water (NOW). Despite its significance and active role in water mass formation, the history of the NOW beyond the observational era remains poorly known. We reconcile the previously unassessed relationship between long-term NOW dynamics and ocean conditions by applying a multiproxy approach to two marine sediment cores from the region that, together, span the Holocene. Declining influence of Atlantic Water in the NOW is coeval with regional records that indicate the inception of a strong and recurrent polynya from ~ 4400 yrs BP, in line with Neoglacial cooling. During warmer Holocene intervals such as the Roman Warm Period, a weaker NOW is evident, and its reduced capacity to influence bottom ocean conditions facilitated northward penetration of Atlantic Water. Future warming in the Arctic may have negative consequences for this vital biological oasis, with the potential knock-on effect of warm water penetration further north and intensified melt of the marine-terminating glaciers that flank the coast of northwest Greenland.
Databáze: MEDLINE
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