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Title of Journal: J Oceanogr

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Abbravation: Journal of Oceanography

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Springer Japan

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DOI

10.1007/s10734-004-1391-2

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1573-868X

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Interannual variability of the North Pacific Subtr

Authors: Fumiaki Kobashi ShangPing Xie
Publish Date: 2011/07/13
Volume: 68, Issue: 1, Pages: 113-126
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Abstract

Seasonal and interannual variability of the Subtropical Countercurrent STCC in the western North Pacific are investigated using observations by satellites and Argo profiling floats and an atmospheric reanalysis The STCC displays a clear seasonal cycle It is strong in late winter to early summer with a peak in June and weak in fall Interannual variations of the spring STCC are associated with an enhanced subtropical front STF below the surface mixed layer In climatology the SST front induces a band of cyclonic wind stress in May north of the STCC on the background of anticyclonic curls that drive the subtropical gyre The band of cyclonic wind and the SST front show large interannual variability and are positively correlated with each other suggesting a positive feedback between them The cyclonic wind anomaly is negatively correlated with the SSH and SST below The strong weak cyclonic wind anomaly elevates depresses the thermocline and causes the fall rise in the SSH and SST accelerating decelerating STCC to the south It is suggested that the anomalies in the SST front and STCC in the preceding winter affect the subsequent development of the cyclonic wind anomaly in May Results from our analysis of interannual variability support the idea that the local wind forcing in May causes the subsequent variations in STCCConstructive comments from anonymous reviewers greatly helped improve the manuscript This study is partially supported by GrantsinAid for Scientific Research of the Ministry of Education Culture Sports Science and Technology Japan 20740267 22106007 23340139 The altimeter product was produced by Ssalto/Duacs and distributed by AVISO with support from CNES The SST dataset was obtained from the NOAA website the TMI SST and QuikSCAT wind data from the Remote Sensing Systems website and the JRA25 data from the JMA website The Argo profiling float data is obtained from the website http//ocgaoriutokyoacjp/member/eoka/data/ and the Grid Point Value of the Monthly Objective Analysis using the Argo data MOAA GPV from the Japan Agency for MarineEarth Science and Technology JAMSTEC website IPRC publication 796

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