期刊
ICES JOURNAL OF MARINE SCIENCE
卷 66, 期 7, 页码 1448-1454出版社
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsp094
关键词
Labrador Sea Water; long-term changes; North Atlantic Oscillation; overflow; Subpolar Gyre; Subtropical Gyre
资金
- Russian Ministry of Education and Science [01.420.1.2.0001]
- Russian Foundation for Basic Research [08-05-00858]
- Russian President [MK-1998.2008.5]
The close relationship between the observed water mass properties and the winter North Atlantic Oscillation (NAO) index (1950-2000s; r(2) approximate to 0.65) implies that changes in the NAO-related atmospheric forcing may account for up to two-thirds of thermohaline changes at the intermediate and deep levels in the subpolar North Atlantic on a decadal time-scale. Persistent NAO decline (amplification) results in increase (decrease) in temperature and salinity in the intermediate-deep water column. A general mechanism explaining the close link between the NAO and coherent decadal changes in the intermediate and deep-water temperature and salinity in the region is inferred from the observed changes in the regional circulation and water mass properties. Two factors dominate this link: (i) intensity of convection in the Labrador Sea controlling injection of relatively cold freshwater into the intermediate layer, and (ii) zonal extension of the Subpolar Gyre that regulates the relative contribution of cold fresh subpolar water and warm saline subtropical water to the deep-water formation.
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