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Five day mean Outgoing Longwave Radiation (OLR) data from June 1974 to May 1988 (14 yr period) derived from the NOAA polar satellite are analysed to determine objectively the onset and withdrawal dates of the southwest monsoon over 7 selected regions of the Indian sub-continent and the adjoining seas. Monthly mean OLR anomalies are derived to examine the intraas well as interannual variability of OLR distribution for each of the 7 regions Linear correlation matrices are also constructed from standardized OLR anomalies to explain the spatial variability of OLR in individual years and to identify the statistical coherency between the regions in the years with excess, normal and deficient monsoon rainfall. Derived dates of the monsoon onset and withdrawal using OLR indices are in fair agreement with the dates of onset and withdrawal obtained based on the rainfall records. In general, the Indian sub-continent has a high positive OLR anomaly during the winter and pre-monsoon months and a moderate negative anomaly in the monsoon season. The distribution of OLR anomalies exhibits strong dependence on both temporal and spatial scales during the years with poor or excess monsoon rainfall.

Space and time variability analyses of the Indian monsoon rainfall as inferred from satellite-derived OLR data