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Sonic layer depth variability in the Arabian Sea

Udaya Bhaskar, TVS and Swain, D and Ravichandran, M (2010) Sonic layer depth variability in the Arabian Sea. International Journal of Oceans and Oceanography, 4 (1). pp. 17-28.

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Spatial and temporal distribution of sonic layer depth (SLD) in the Arabian Sea (AS) was studied using temperature and salinity (T/S) profiles from Argo floats during the years 2003 - 2004 and World Ocean Atlas 2001 (WOA01) climatology. SLD was obtained from sound velocity profiles computed from T/S data. SLD variability as obtained from Argo matched well with those obtained from the WOA01 in certain locations and showed remarkable difference in some other. SLD variability in the AS is mainly related to seasonal variations in T/S owing to influence of seasonal phenomena as well as the geography of the region. Deeper SLDs were observed during summer monsoon (> 90 m) and winter monsoon (> 80 m) respectively. Up-welling and down-welling (Ekman dynamics) associated with the Findlater Jet controlled SLD during the summer monsoon. While in winter monsoon, cooling and convective mixing regulated SLD in the study region. Weak winds, high insolation and positive net heat flux lead to the formation of thin, warm and stratified sonic layer during pre and post summer monsoon periods, respectively. Examination of SLD in selected areas further revealed clear seasonal changes reflecting strong monsoon signals in the AS.

Item Type: Article
Additional Information: Copyright of this article belongs to Research India Publications.
Subjects: Meteorology and Climatology
Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 19 Jul 2014 05:26
Last Modified: 19 Jul 2014 05:26

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