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Estimated Seasonal Cycle of North Atlantic Eighteen Degree Water Volume

Estimated Seasonal Cycle of North Atlantic Eighteen Degree Water Volume The seasonal cycle in the volume and formation rate of Eighteen Degree Water (EDW) in the North Atlantic is quantified over the 3-yr period from 2004 to 2006. The EDW layer is defined as all waters that have a temperature between 17°° and 19°°C. The study is facilitated by a synthesis of various observations——principally Argo profiles of temperature and salinity, sea surface temperature, and altimetry——using a general circulation model as an interpolation tool. The winter increase in EDW volume is most pronounced in February, peaking at about 8.6 Svy, where 1 Svy ≈≈ 3.15 ×× 10 13 m 3 corresponding to a 1 Sv (Sv ≡≡ 10 6 m 3 s −−1 ) flow sustained for one year. This largely reflects winter EDW formation due to air––sea heat fluxes. Over the remainder of the year, newly created EDW is consumed by air––sea heat fluxes and ocean mixing, which roughly contribute ⅔⅔ and ⅓⅓, respectively. The authors estimate a net annual volume increase of 1.4 Svy, averaged over the 3-yr period. It is small compared to the amplitude of the seasonal cycle (8.6 Svy) and annual formation due to air––sea fluxes (4.6 Svy). The overall EDW layer volume thus appears to fluctuate around a stable point during the study period. An estimate of the full EDW volume budget is provided along with an uncertainty estimate of 1.8 Svy, and largely resolves apparent conflicts between previous estimates. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

Estimated Seasonal Cycle of North Atlantic Eighteen Degree Water Volume

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Publisher
American Meteorological Society
Copyright
Copyright © 2009 American Meteorological Society
ISSN
1520-0485
DOI
10.1175/2010JPO4257.1
Publisher site
See Article on Publisher Site

Abstract

The seasonal cycle in the volume and formation rate of Eighteen Degree Water (EDW) in the North Atlantic is quantified over the 3-yr period from 2004 to 2006. The EDW layer is defined as all waters that have a temperature between 17°° and 19°°C. The study is facilitated by a synthesis of various observations——principally Argo profiles of temperature and salinity, sea surface temperature, and altimetry——using a general circulation model as an interpolation tool. The winter increase in EDW volume is most pronounced in February, peaking at about 8.6 Svy, where 1 Svy ≈≈ 3.15 ×× 10 13 m 3 corresponding to a 1 Sv (Sv ≡≡ 10 6 m 3 s −−1 ) flow sustained for one year. This largely reflects winter EDW formation due to air––sea heat fluxes. Over the remainder of the year, newly created EDW is consumed by air––sea heat fluxes and ocean mixing, which roughly contribute ⅔⅔ and ⅓⅓, respectively. The authors estimate a net annual volume increase of 1.4 Svy, averaged over the 3-yr period. It is small compared to the amplitude of the seasonal cycle (8.6 Svy) and annual formation due to air––sea fluxes (4.6 Svy). The overall EDW layer volume thus appears to fluctuate around a stable point during the study period. An estimate of the full EDW volume budget is provided along with an uncertainty estimate of 1.8 Svy, and largely resolves apparent conflicts between previous estimates.

Journal

Journal of Physical OceanographyAmerican Meteorological Society

Published: Mar 18, 2009

References