Does the Western-Ghats play any dynamical role in the distance effect of vortex over the Bay of Bengal on the enhancement of monsoon rainfall over Pune?

Abstract

lkj & bl ’kks/k i= esa nf{k.k&if’pe ekulwu _rq ¼,l-MCY;w-,e-,l-½ ds nkSjku caxky dh [kkM++h esa mBs coaMj ds nwjorhZ izHkko ds QyLo:Ik iq.ks esa o"kkZ esa gqbZ o`f) esa if’peh ?kkV ¼MCY;w-th-½ dh xR;kRed Hkwfedk ¼;fn dksbZ gks rks½ dh tk¡p djus dk iz;kl fd;k x;k gSA bldh tk¡p djus ds fy, e/; ekiØe vojks/k ds Åij ok;q&izokg ds ,d xR;kRed ekWMy dk mi;ksx fd;k x;k gSA N% ?kVukvksa ds v/;;u ls ;g Kkr gqvk gS fd caxky dh [kkM+h esa coaMj mBus dh fLFkfr esa iq.ks esa gqbZ o"kkZ esa o`f) ns[kh xbZ gSA bu N% ?kVukvksa esa ls pkj  ?kVukvksa esa ;g ns[kk x;k gS fd xR;kRed ekWMy iq.ks esa o"kkZ dh izsf{kr ?kV&c<+ ¼deh&cs’kh½ dk irk yxkus esa xq.kkRed :Ik ls lQy jgk gSA bu pkjksa ?kVukvksa esa if’peh iousa if’pe rV ds fdukjs m/okZ/kj esa vis{kkÑr dkQh rhoz FkhaA vU; nks ?kVukvksa esa ls ,d ?kVuk esa ;g ekWMy o"kkZ dh vf/kdrk dks] de ls de xq.kkRed :Ik esa] irk yxkus esa lQy jgk gS ijUrq o"kkZ esa deh dk irk yxkus esa vlQy jgk gSA ,d vU; ?kVuk esa ;g ekWMy iq.ks esa o"kkZ dh ?kV&c<+ Kkr djus esa xq.kkRed :Ik ls Hkh iw.kZr;k vlQy jgk gSA vafre nks ?kVukvksa esa if’pe rVh; LVs’ku ij if’peh iou detksj ,oa lrgh FkhA 

 An attempt has been made to examine the dynamical role (if any) played by the Western Ghats (WG), in the distance effect of vortex over the Bay of Bengal (BOB) on the rainfall enhancement over Pune, during southwest monsoon season (SWMS). To examine it, a dynamical model of airflow over a meso-scale barrier has been used. Six cases have been studied, in which enhancement of rainfall over Pune in presence of vortex over the Head Bay are noticed. Out of these six cases, in four cases it is found that the dynamical model can capture, at least qualitatively, the observed fluctuation (rise and fall) of rainfall over Pune. In these four cases westerly along west coast was strong with considerable depth in vertical. In one of the other two cases, the model has been able to capture, at least qualitatively, the observed rise in rainfall but failed to capture the observed fall in rainfall. In the other case the model has failed completely to capture, even qualitatively, the fluctuation in observed rainfall over Pune. In the last two cases, westerly along west coast station was weak and shallow.