ASIRI : an ocean–atmosphere initiative for Bay of Bengal

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Wijesekera, Hemantha W.
Shroyer, Emily L.
Tandon, Amit
Ravichandran, M.
Sengupta, Debasis
Jinadasa, S. U. P.
Fernando, Harindra J. S.
Agrawal, Neeraj
Arulananthan, India K.
Bhat, G. S.
Baumgartner, Mark F.
Buckley, Jared
Centurioni, Luca R.
Conry, Patrick
Farrar, J. Thomas
Gordon, Arnold L.
Hormann, Verena
Jarosz, Ewa
Jensen, Tommy G.
Johnston, T. M. Shaun
Lankhorst, Matthias
Lee, Craig M.
Leo, Laura S.
Lozovatsky, Iossif
Lucas, Andrew J.
MacKinnon, Jennifer A.
Mahadevan, Amala
Nash, Jonathan D.
Omand, Melissa M.
Pham, Hieu
Pinkel, Robert
Rainville, Luc
Ramachandran, Sanjiv
Rudnick, Daniel L.
Sarkar, Sutanu
Send, Uwe
Sharma, Rashmi
Simmons, Harper L.
Stafford, Kathleen M.
St. Laurent, Louis C.
Venayagamoorthy, Subhas K.
Venkatesan, Ramasamy
Teague, William J.
Wang, David W.
Waterhouse, Amy F.
Weller, Robert A.
Whalen, Caitlin B.
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Air–Sea Interactions in the Northern Indian Ocean (ASIRI) is an international research effort (2013–17) aimed at understanding and quantifying coupled atmosphere–ocean dynamics of the Bay of Bengal (BoB) with relevance to Indian Ocean monsoons. Working collaboratively, more than 20 research institutions are acquiring field observations coupled with operational and high-resolution models to address scientific issues that have stymied the monsoon predictability. ASIRI combines new and mature observational technologies to resolve submesoscale to regional-scale currents and hydrophysical fields. These data reveal BoB’s sharp frontal features, submesoscale variability, low-salinity lenses and filaments, and shallow mixed layers, with relatively weak turbulent mixing. Observed physical features include energetic high-frequency internal waves in the southern BoB, energetic mesoscale and submesoscale features including an intrathermocline eddy in the central BoB, and a high-resolution view of the exchange along the periphery of Sri Lanka, which includes the 100-km-wide East India Coastal Current (EICC) carrying low-salinity water out of the BoB and an adjacent, broad northward flow (∼300 km wide) that carries high-salinity water into BoB during the northeast monsoon. Atmospheric boundary layer (ABL) observations during the decaying phase of the Madden–Julian oscillation (MJO) permit the study of multiscale atmospheric processes associated with non-MJO phenomena and their impacts on the marine boundary layer. Underway analyses that integrate observations and numerical simulations shed light on how air–sea interactions control the ABL and upper-ocean processes.
Author Posting. © American Meteorological Society, 2016. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Bulletin of the American Meteorological Society 97 (2016): 1859–1884, doi:10.1175/BAMS-D-14-00197.1.
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Bulletin of the American Meteorological Society 97 (2016): 1859–1884
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