Details

Autor(en) / Beteiligte

• Sengupta, Debasis
• Bharath Raj, G. N.
• Ravichandran, M.
• Sree Lekha, J.
• Papa, Fabrice

Titel

Near‐surface salinity and stratification in the north Bay of Bengal from moored observations

Ist Teil von

• Geophysical research letters, 2016-05, Vol.43 (9), p.4448-4456

Ort / Verlag

Washington: John Wiley & Sons, Inc

Erscheinungsjahr

2016

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• A thin layer of fresh water from summer monsoon rain and river runoff in the Bay of Bengal (BoB) has profound influence on air‐sea interaction across the south Asian region, but the mechanisms that sustain the low‐salinity layer are as yet unknown. Using the first long time series of high‐frequency observations from a mooring in the north BoB and satellite salinity data, we show that fresh water from major rivers is transported by large‐scale flow and eddies, and shallow salinity stratification persists from summer through the following winter. The moored observations show frequent 0.2–1.2 psu salinity jumps with time scales of 10 min to days, due to O(1–10) km submesoscale salinity fronts moving past the mooring. In winter, satellite sea surface temperature shows 10 km wide filaments of cool water, in line with moored data. Rapid salinity and temperature changes at the mooring are highly coherent, suggesting slumping of salinity‐dominated fronts. Based on these observations, we propose that submesoscale fronts may be one of the important drivers for the persistent fresh layer in the north BoB. Key Points Persistence of shallow stratification and river water from moored data in the north Bay of Bengal First evidence of submesoscale (order 1–10 km) salinity fronts in the Bay of Bengal Slumping of submesoscale fronts may sustain shallow stratification