Seasonal variability of the East Greenland Coastal Current
Abstract The East Greenland Coastal Current (EGCC) is characterized as cold, low-salinity polar waters flowing equatorward on the east Greenland shelf. It is an important conduit of freshwater from the Arctic Ocean, but our present understanding of it is poor, outside of an assortment of measurement...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.652.3688 http://eprints.soton.ac.uk/365708/1/jgrc20734.pdf |
| Summary: | Abstract The East Greenland Coastal Current (EGCC) is characterized as cold, low-salinity polar waters flowing equatorward on the east Greenland shelf. It is an important conduit of freshwater from the Arctic Ocean, but our present understanding of it is poor, outside of an assortment of measurements which stem mainly from summertime visits by research vessels. This manuscript first describes measurements from moored instruments deployed on the East Greenland shelf (63N) between 2000 and 2004. The measure-ments are then used to show that a high-resolution coupled ice-ocean global general circulation model sup-ports a realistic representation of the EGCC. The results show that the EGCC exists throughout the year and is stronger in winter than in summer. The model EGCC seawater transports are a maximum (minimum) in February (August), at 3.8 (1.9)3 106 m3 s21. Freshwater transports, including modeled estimates of sea ice transport and referenced to salinity 35.0, are a maximum (minimum) in February (August) at 106 (59)3 103 m3 s21. The model results show that wind and buoyancy forcing are of similar importance to EGCC trans-port. An empirical decomposition of the buoyancy-forced transport into a buoyancy-only component and a coupled wind and buoyancy component indicates the two to be of similar magnitude in winter. The model annual mean freshwater flux of 80–90 3 103 m3 s21 approaches 50 % of the net rate of Arctic freshwater gain, underlining the climatic importance of the EGCC. 1. |
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