Response of the Subtropical and subpolar gyres to wind stress anomalies in the North Pacific

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Since the anomaly of the subpolar gyre is found persisting longer than that of the subtropical gyre the negative SST anomaly in the KOE region is thus more prominent than the positive SST anomaly in the Kuroshio region .

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When the westerly wind stress anomaly is prescribed maintaining for a decade the cooling of the KOE region induced by the subpolar gyre anomaly is subsequently able to influence the central North Pacific accordingly maintaining the initial negative SST anomaly over there .

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On the other hand the wind stress curl anomaly also strengthens the subpolar gyre so as to cool the Kuroshio / Oyashio Extension region ( KOE ) .

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It is shown from the annual mean zonally averaged temperature and salinity distributions that the thermocline depths show a W-shaped pattern and there is a salinity front in the subpolar sea area .

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