Distribution of mean monthly surface/upper air parameters during July-August months of 1982-83 and 1987- 88

Abstract

Lkkj & Hkkjrh; xzh"edkyhu ekulwu dks leqnz vkSj /kjkry dh feyh&tqyh ok;qeaMyh; ifj?kVuk ekurs gq, bldk v/;;u HkweaMyh; izÑfr ds ifjn`’; esa fd;k x;k gSA bl v/;;u esa nks fo"ke ifjfLFkfr;ksa  esa ekulwu ds O;ogkj dks le>us ds fy, Øe’k% de vkSj vf/kd nksuksa rjg dh o"kkZ okys nks o"kksaZ ¼1982] 1987½] nks o"kksaZ ¼1983] 1988½ esa xzh"edkyhu ekulwu ds nks izeq[k eghuksa tqykbZ vkSj vxLr ds nkSjku 'kwU; va’k m- ls 40 va’k m-@40 va’k iw- ls 100 va’k iw- ds {ks= esa ek/; ekfld /kjkryh; izkpyksa ds forj.k dks fy;k x;k gSA blds vfrfjDr xzh"edkyhu ekulwu ij {kksHkeaMyh; if’peh gokvksa ds izHkko vkSj if’peh fo{kksHkksa dh xfrfof/k dk ewY;kadu djus ds fy, fuEu {kksHkeaMy dh dfVca/kh; iouksa ds forj.k vFkkZr~] tqykbZ] vxLr ds eghuksa esa 850 gSDVkikLdy vkSj 700 gSDVkikLdy ds Lrjksa tuojh] ebZ] tqykbZ vkSj vxLr ds eghuksa ds fy, 500 gSDVkikLdy ij HkwfLFkfrt Å¡pkb;ksa dk v/;;u fd;k x;k gSA bl v/;;u ls izkIr gq, ifj.kkeksa ij fopkj&foe’kZ fd;k x;k gSA

 Indian summer monsoon is considered as an ocean-land-atmosphere coupled phenomenon and also of global nature. In present study, the distribution of mean monthly surface parameters within 0° N – 40° N / 40° E – 100° E region during the two representative months of summer monsoon, July and August,  in both deficient years (1982, 1987) and excess years (1983, 1988) was taken up to understand the behaviour of monsoon during two contrasting situations. Apart from this, the distribution of lower tropospheric zonal winds viz., 850 hPa and 700 hPa levels during July, August months, 500 hPa geopotential heights for the months of January, May, July and August months studied to assess the influence of tropospheric westerlies and  activity of Western Disturbances on the summer monsoon. The results discussed.