Is Ekman pumping responsible for the seasonal variation of warm circumpolar deep water in the Amundsen Sea? SCIE SCOPUS

DC Field Value Language Kim, T. W. - Ha, H. K. - Wahlin, A. K. - Lee, S. H. - Kim, C. S. - Lee, J. H. - Cho, Y. K. - 2020-04-16T11:25:05Z - 2020-04-16T11:25:05Z - 2020-01-28 - 2017-01-01 -
dc.identifier.issn 0278-4343 -
dc.identifier.uri -
dc.description.abstract Ekman pumping induced by horizontally varying wind and sea ice drift is examined as an explanation for observed seasonal variation of the warm layer thickness of circumpolar deep water on the Amundsen Sea continental shelf. Spatial and temporal variation of the warm layer thickness in one of the deep troughs on the shelf (Dotson Trough) was measured during two oceanographic surveys and a two-year mooring deployment. A hydrographic transect from the deep ocean, across the shelf break, and into the trough shows a local elevation of the warm layer at the shelf break. On the shelf, the water flows south-east along the trough, gradually becoming colder and fresher due to mixing with cold water masses. A mooring placed in the trough shows a thicker and warmer layer in February and March (late summer/early autumn) and thinner and colder layer in September, October and November (late winter/early spring). The amplitude of this seasonal variation is up to 60 m. In order to investigate the effects of Ekman pumping, remotely sensed wind (Antarctic Mesoscale Prediction System wind data) and sea ice velocity and concentration (EASE Polar Pathfinder) were used. From the estimated surface stress field, the Ekman transport and Ekman pumping were calculated. At the shelf break, where the warm layer is elevated, the Ekman pumping shows a seasonal variation correlating with the mooring data. Previous studies have not been able to show a correlation between observed wind and bottom temperature, but it is shown here that when sea ice drift is taken into account the Ekman pumping at the outer shelf correlates with bottom temperature in Dotson Trough. The reason why the Ekman pumping varies seasonally at the shelf break appears to be the migration of the ice edge in the expanding polynya in combination with the wind field which on average is westward south of the shelf break. -
dc.description.uri 1 -
dc.language English -
dc.subject WEST ANTARCTICA -
dc.subject WIND STRESS -
dc.subject SHELF -
dc.subject VARIABILITY -
dc.subject INFLOW -
dc.subject LAYER -
dc.title Is Ekman pumping responsible for the seasonal variation of warm circumpolar deep water in the Amundsen Sea? -
dc.type Article -
dc.citation.endPage 48 -
dc.citation.startPage 38 -
dc.citation.volume 132 -
dc.identifier.bibliographicCitation CONTINENTAL SHELF RESEARCH, v.132, pp.38 - 48 -
dc.identifier.doi 10.1016/j.csr.2016.09.005 -
dc.identifier.scopusid 2-s2.0-85002170009 -
dc.identifier.wosid 000393005500005 -
dc.type.docType Article -
dc.description.journalClass 1 -
dc.subject.keywordPlus ANTARCTIC ICE-SHEET -
dc.subject.keywordPlus PINE ISLAND GLACIER -
dc.subject.keywordPlus OCEAN CIRCULATION -
dc.subject.keywordPlus DRAG COEFFICIENTS -
dc.subject.keywordPlus WEST ANTARCTICA -
dc.subject.keywordPlus WIND STRESS -
dc.subject.keywordPlus SHELF -
dc.subject.keywordPlus VARIABILITY -
dc.subject.keywordPlus INFLOW -
dc.subject.keywordPlus LAYER -
dc.subject.keywordAuthor Southern Ocean -
dc.subject.keywordAuthor Ekman transport -
dc.subject.keywordAuthor Sea ice drift -
dc.subject.keywordAuthor Amundsen Sea -
dc.subject.keywordAuthor Circumpolar deep water -
dc.subject.keywordAuthor Antarctic winter water -
dc.subject.keywordAuthor Wind stress -
dc.subject.keywordAuthor Surface stress -
dc.subject.keywordAuthor Marginal ice zone -
dc.relation.journalWebOfScienceCategory Oceanography -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.relation.journalResearchArea Oceanography -
Appears in Collections:
Marine Environmental & Climate Research Division > Ocean Circulation Research Center > 1. Journal Articles
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