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Wind Forcing of Salinity Anomalies in the Denmark Strait Overflow : Volume 8, Issue 3 (21/06/2011)

By Hall, S.

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Book Id: WPLBN0003973697
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Wind Forcing of Salinity Anomalies in the Denmark Strait Overflow : Volume 8, Issue 3 (21/06/2011)  
Author: Hall, S.
Volume: Vol. 8, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Heywood, K. J., Wadley, M. R., Dye, S. R., & Hall, S. (2011). Wind Forcing of Salinity Anomalies in the Denmark Strait Overflow : Volume 8, Issue 3 (21/06/2011). Retrieved from http://worldebookfair.org/


Description
Description: School of Environmental Sciences, University of East Anglia, Norwich, UK. The overflow of dense water from the Nordic Seas to the North Atlantic through Denmark Strait is an important part of the global thermohaline circulation. The salinity of the overflow plume has been measured by an array of current meters across the continental slope off the coast of Angmagssalik, southeast Greenland since September 1998. During 2004 the salinity of the overflow plume changed dramatically, with the entire width of the array (70 km) freshening between January 2004 and July 2004, with a significant negative salinity anomaly of about 0.06 in May. The event in May represents a fresh anomaly of over 3 standard deviations from the mean since recording began in 1998. We show that the OCCAM 1/12° Ocean General Circulation Model not only reproduces the 2004 freshening event (r=0.96, p<0.01), but also correlates well with salinity observations over a previous 6 year period (r=0.54, p<0.01). Consequently the physical processes causing the 2004 anomaly and prior variability in salinity are investigated using the model output. Our results reject the hypotheses that the anomaly is caused by processes occurring between the overflow sill and the moorings, or by an increase in upstream net freshwater input. Instead, we show that the 2004 salinity anomaly is caused by an increase in volume flux of low salinity water, with a potential density greater than 27.60 kg m−3, flowing towards the Denmark Strait sill in the East Greenland Current. This is caused by an increase of southward wind stress upstream of the sill at around 75° N 20° W four and a half months earlier, and an associated spin-up of the Greenland Sea Gyre.

Summary
Wind forcing of salinity anomalies in the Denmark Strait overflow

Excerpt
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