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Meridional Shift of the Oyashio Extension Front in the Past 36 Years
Author(s) -
Wu Baolan,
Lin Xiaopei,
Qiu Bo
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl078433
Subject(s) - geology , front (military) , zonal and meridional , ekman transport , wind stress , climatology , curl (programming language) , geophysics , geodesy , oceanography , upwelling , computer science , programming language
The meridional shift of Oyashio Extension (OE) front in the past 36 years was analyzed by using the high‐resolution Optimum Interpolation SST data. The annual mean OE front has moved northward in its eastern part (between 157°E and 172°E) by 0.018°/year but no obvious poleward shift in the western OE front (between 145°E and 157°E). It is shown that the trade wind became stronger and broader, and the whole wind field moved northward in the past 36 years, shifting the zero wind stress curl line (or the zero Sverdrup streamline) and the eastern OE front northward. The above mechanism is confirmed by a 1.5‐layer reduced‐gravity model simulation as well as the altimetry data. Meanwhile, the local Ekman heat transport anomaly due to the wind field changes is found to be one of the contributors to the northward shift of the eastern OE front. However, both wind stress curl and local Ekman heat transport anomalies do not favor northward shift of the western OE front.