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

DRS at CSIR-National Institute of Oceanography

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Title Surface layer temperature inversion in the Bay of Bengal: Main characteristics and related mechanisms
 
Creator Pankajakshan, T.
Suresh, I.
Gautham, S.
PrasannaKumar, S.
Lengaigne, M.
Rao, R.R.
Neetu, S.
Hegde, A.
 
Subject Meteorology and climatology
Meteorology and climatology
Oceanography and limnology
Oceanography and limnology
 
Description 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
 
Date 2016-12-02T11:43:58Z
2016-12-02T11:43:58Z
2016
 
Type Journal Article
 
Identifier Journal of Geophysical Research: Oceans, vol.121(8); 2016; 5682-5696
no
http://drs.nio.org/drs/handle/2264/5048
 
Language en
 
Relation J_Geophys_Res_C_Oceans_121_5682.jpg
 
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.
 
Publisher American Geophysical Union