Long-lived vortices as a mode of deep ventilation in the Greenland Sea

Jean Claude Gascard, Andrew J. Watson, Marie-Jose Messias, Kristina Anders Olsson, Truls Johannesen, Knud Simonsen

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

The Greenland Sea is one of a few sites in the world ocean where convection to great depths occurs 1 – 4 —a process that forms some of the densest waters in the ocean. But the role of deep convective eddies, which result from surface cooling and mixing across density surfaces followed by geostrophic adjustment 5 , has not been fully taken into account in the description of the initiation
and growth of convection 6 . Here we present tracer, float and hydrographic observations of long-lived (,1 year) and compact (,5 km core diameter) vortices that reach down to depths of 2 km. The eddies form in winter, near the rim of the Greenland Sea central gyre, and rotate clockwise with periods of a few days. The cores of the observed eddies are constituted from a mixture
of modified Atlantic water that is warm and salty with polar water that is cold and fresh. We infer that these submesoscale coherent eddies contribute substantially to the input of Atlantic and polar waters to depths greater than 500 m in the central
Greenland Sea.
Original languageEnglish
Pages (from-to)525-527
Number of pages3
JournalNature
Volume416
DOIs
Publication statusPublished - 4 Apr 2002

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