Rainfall Monitoring for the Indian Monsoon Region from Merged Gauge, METEOSAT, INSAT and NWP Models

摘要

For study of Asian monsoon, IR based estimates from Kalpana-1, Meteosat-5 and microwave based estimates from TRMM rainfall data are very useful, particularly for the oceanic regions. Satellite only estimates have biases, but are able to represent the large-scale monsoon rainfall features. IR estimates are unable to capture the heavy rain over the west coast of India. Even the TRMM values are underestimating the heavy rainfall over the west coast of India. Inclusion of gauge data (over land and island) improves the representation of daily rainfall. Gauge data corrects the biases in the satellite estimates. The number of gauge stations available in real time is less, and for a better analysis of the large-scale rainfall field at least the full set of 540 stations from India will be very useful. For meso-scale analysis a much denser network of gauge stations will be required. These gauge data will be very useful to correct the current biases in the satellite estimates.