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Title of Journal: J Oceanogr

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Abbravation: Journal of Oceanography

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Publisher

Springer Netherlands

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DOI

10.1007/bf02868058

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1573-868X

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Further evidence for nonreemergence of winter SST

Authors: Shusaku Sugimoto Kimio Hanawa
Publish Date: 2007/08/01
Volume: 63, Issue: 4, Pages: 625-635
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Abstract

Following our previous study Sugimoto and Hanawa 2005b we further investigate the reason why reemergence of winter sea surface temperature anomalies does not occur in the North Pacific eastern subtropical mode water NPESTMW area despite its occurrence in the North Pacific subtropical mode water and North Pacific central mode water areas We use vertical temperature and salinity profiles of the World Ocean Circulation Experiment Hydrographic Program and Argo floats with high vertical and temporal resolution together with heat flux data through the sea surface We point out first that one of the causes for nonoccurrence of reemergence is that the thickness of NPESTMW is very thin In addition to this basic cause two major reasons are found a vigorous mixing in the lower portion of NPESTMW and less heat input from the atmosphere in the warming season Since in the lower portion of NPESTMW and deeper the stratification is favorable for saltfinger type convection to occur compared with the other mode water areas vigorous mixing takes place This is confirmed by both a large Turner Angle there and the existence of staircase structures in vertical temperature and salinity profiles From the viewpoint of heat input the NPESTMW area gradually gains heat in the warming season compared with other mode water areas As a result NPESTMW cannot be capped so quickly by the shallow summer mixed layer and water properties of NPESTMW are to be gradually modified even in the upper portion

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