Surface layer temperature inversion in the Bay of Bengal: Main characteristics and related mechanisms

Show simple item record Pankajakshan, T. Suresh, I. Gautham, S. PrasannaKumar, S. Lengaigne, M. Rao, R.R. Neetu, S. Hegde, A. 2016-12-02T11:43:58Z 2016-12-02T11:43:58Z 2016
dc.identifier.citation Journal of Geophysical Research: Oceans, vol.121(8); 2016; 5682-5696
dc.identifier.other no
dc.description.abstract Surface layer temperature inversion (SLTI), a warm layer sandwiched between surface and subsurface colder waters, has been reported to frequently occur in conjunction with barrier layers in the Bay of Bengal (BoB), with potentially commensurable impacts on climate and postmonsoon tropical cyclones. Lack of systematic measurements from the BoB in the past prevented a thorough investigation of the SLTI spatiotemporal variability, their formation mechanisms, and their contribution to the surface temperature variations. The present study benefits from the recent Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction (RAMA) buoys located in BoB along 90°E at 4°N, 8°N, 12°N, and 15°N over the 2006-2014 period. Analysis of data from these RAMA buoys indicates that SLTI forms after the summer monsoon and becomes fully developed during winter (December–February). SLTI exhibits a strong geographical dependency, with more frequent (80% times during winter) and intense inversions (amplitude, DeltaT ~0.7°C) occurring only in the northern BoB compared to central and southern Bay. SLTI also exhibits large interannual and intraseasonal variations, with intraseasonal amplitude significantly larger (DeltaT ~0.44°C) than the interannual amplitude (~0.26°C). Heat budget analysis of the mixed layer reveals that the net surface heat loss is the most dominant process controlling the formation and maintenance of SLTI. However, there are instances of episodic advection of cold, low-saline waters over warm-saline waters leading to the formation of SLTI as in 2012–2013. Vertical processes contribute significantly to the mixed layer heat budget during winter, by warming the surface layer through entrainment and vertical diffusion
dc.language.iso en
dc.publisher American Geophysical Union
dc.relation.requires J_Geophys_Res_C_Oceans_121_5682.jpg
dc.rights Copyright [2016]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
dc.subject Meteorology and climatology
dc.subject Meteorology and climatology
dc.subject Oceanography and limnology
dc.subject Oceanography and limnology
dc.title Surface layer temperature inversion in the Bay of Bengal: Main characteristics and related mechanisms
dc.type Journal Article

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