`ICE CORES HOLD CLUES TOMONSOON CHANGES'

Down to Earth - - APPRAISAL -

The main ob­jec­tive of study­ing mon­soon at the Na­tional Cen­tre for Antarc­tic and Ocean Re­search (ncaor) is to understand how it has evolved over a long pe­riod of time. At­mo­spheric study helps us de­ter­mine short-term changes

in mon­soon pat­terns, Work at the Cen­tre for At­mo­spheric and Oceanic Sci­ences (caos) broadly re­volves around the mon­soon but is not lim­ited to it. We mon­i­tor the at­mos­phere and oceans at dif­fer­ent scales, rang­ing from cloud cov­ers to cli­mate change. We also try to understand in­tra-sea­sonal and inter-an­nual vari­abil­ity of mon­soons and the im­pact of aerosols and oceans on them. This is be­cause phys­i­cal pro­cesses on the ocean sur­face are very dif­fer­ent from the phys­i­cal mech­a­nisms at deeper lay­ers.

We are part of the Ocean Mix­ing and Mon­soon (omm) pro­gramme along with sev­eral other In­dian and Amer­i­can in­sti­tu­tions,through which we hope to learn why the Bay of Ben­gal has a per­sis­tent shal­low, fresh layer in spite of mix­ing by winds, waves and tides; and to understand how this layer af­fects ocean ther­mo­dy­nam­ics,air-sea fluxes and air-sea in-

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