The independence of SST skewness to thermocline feedback in the eastern equatorial Indian Ocean.

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Title:	The independence of SST skewness to thermocline feedback in the eastern equatorial Indian Ocean.
Authors:	洪志誠;Chi-Cherng Hong;Tim Li
Contributors:	地球環境暨生物資源學系(含環境教育與資源碩士班)
Keywords:	skewness;thermocline feedback
Date:	2010-06
Issue Date:	2014-01-17 19:30:23 (UTC+8)
Abstract:	The observed sea surface height (SSH)-sea surface temperature (SST) in east equatorial Indian Ocean (EEIO) shows a significant asymmetric relation between the positive and negative SSH anomalies during boreal autumn. Whether or not the thermocline- SST feedback is responsible for the negative SST skewness in the EEIO is explored by diagnosing various air-sea feedback processes and a mixed layer heat budget. Our analysis based on observations suggests that the SSH-subsurface temperature relation is approximately symmetric between the positive and negative episode, which is significantly different from the asymmetric SSH-SST relation. This implies that the observed SSH-SST asymmetry is not attributed to the ocean thermocline feedback. A further analysis of the SST-precipitation, precipitation-wind stress and wind stress-SSH relations demonstrates that the asymmetry arises from asymmetric atmospheric heating/wind responses to the SST anomaly. A mixed layer heat budget analysis reveals that the ratio of the mixed-layer temperature tendency between the positive and negative events keeps approximately unchanged with and without vertical temperature advection, suggesting that the thermocline-feedback is not crucial for generating the negative SST skewness in the EEIO.
Relation:	Geophysical Research Letters，Vol. 37, Issue 11，Pages L11702
Appears in Collections:	[Department of Earth and Life Science] Periodical Articles

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