On the Nature of Temporal Variability of the Gulf Stream Path from 75° to 55°W

Earth Interactions

AvijitGangopadhyay¹ 

关键词: Circulation/dynamics;    Ocean circulation;    Ocean dynamics;    Atmosphere/ocean structure/phenomena;    Atmosphere–ocean interaction;    North Atlantic Oscillation;   

DOI  :  10.1175/EI-D-15-0025.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractThe response of the Gulf Stream (GS) system to atmospheric forcing is generally linked either to the basin-scale winds on the subtropical gyre or to the buoyancy forcing from the Labrador Sea. This study presents a multiscale synergistic perspective to describe the low-frequency response of the GS system. The authors identify dominant temporal variability in the North Atlantic Oscillation (NAO), in known indices of the GS path, and in the observed GS latitudes along its path derived from sea surface height (SSH) contours over the period 1993–2013. The analysis suggests that the signature of interannual variability changes along the stream’s path from 75° to 55°W. From its separation at Cape Hatteras to the west of 65°W, the variability of the GS is mainly in the near-decadal (7–10 years) band, which is missing to the east of 60°W, where a new interannual (4–5 years) band peaks. The latter peak (4–5 years) was missing to the west of 65°W. The region between 65° and 60°W seems to be a transition reg...

【 授权许可】

Unknown