The sharply contrasting northern embayments of the Indian

  • Slides: 2
Download presentation
The sharply contrasting, northern embayment's of the Indian Ocean 2012 -2016 SSS (Aquarius, SMAP)

The sharply contrasting, northern embayment's of the Indian Ocean 2012 -2016 SSS (Aquarius, SMAP) and MDOT AS AS Sv -0. 11 Sv Bo. B +0. 13 Sv Low SSS spreading pathways Low SSS ITF Furthest SSS-max from equator Agulhas Leakage caught in Interocean’ vise’ ITF and ACC § The Bay of Bengal (Bo. B) and the Arabian Sea (AS) SSS difference is >3 ppt, more so than the ‘salty’ Atlantic and the ‘fresh’ Pacific! § Bo. B receives immense terrestrial freshwater inflow, while AS is subjected to strong evaporation. P-E+R for Bo. B is +0. 13 Sv, for AS its -0. 11 Sv: ~balance § Bo. B/AS DSSS depends on the efficiency of the interchange of their waters: the salty Arabian Sea invades Bo. B within thermocline as Bo. B exports low salinity surface layer, an estuary set-up. ACC Wind acting on the variable stratification between anticyclonic and cyclone eddies may induce different SST response. Bo. B’s rich field of mesoscale offers a unique ‘marine face’ to tropical atmosphere. The windy atmosphere sees not a smooth regional scale climatology but rather a freckled SST pattern reflecting the field Might this affect the evolution and pathways of TC? of intraseasonal oscillations? eddy rich SSH Hovmöller @12. 5°N

Bo. B/AS pathways [work in progress] AS box B D Peaks in winter, but

Bo. B/AS pathways [work in progress] AS box B D Peaks in winter, but a few (2013/2014) summer peaks winter winter summer B Bo. B T/S Box C dec Bo. B T/S Box D feb Strong interannual signal apr feb none 2015 -16 ITF