Use of large-scale atmospheric energetics for understanding the dynamics of contrasting Indian summer monsoon rainfall in different years

摘要: An attempt has been made to understand the dynamics of contrasting Indian summer monsoon rainfall (ISMR) in different years during 1979–2017, from large-scale atmospheric energetics aspects. Daily values eddy and zonal available potential energy (APE), their generation, kinetic (KE), conversions KE APE KE, were computed over region bounded by 65°E–95°E 5°N–35°N period 1 May 30 September for 39 years (1979–2017), using daily ECMWF reanalyzed data at 0.125° × 0.125° resolution (3 components wind temperature). ISMR was classified into three categories, viz., deficient below normal, normal above excess. The anomaly these parameters each jackknife method then composite anomalies constructed with above-mentioned categories ISMR. following salient features emerge this study: Analysis shows that case excess (below deficient) ISMR, C(AZ, KZ) less (more) than normal. In C(AE, KE) more (less) Broadly, AE) whereas it G(AZ) Total total conversion