Estimation of Centre and Intensity of Tropical Cyclones over the North Indian Ocean Using Microwave Imageries - Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change - page 190

including Aqua-1, F-13, F-15, F-16, F-17, F-18, Metop-A, NOAA-15, NOAA-
16, NOAA-17, NOAA-18, NOAA-19 and TRMM have been compared and
analysed. Also these estimates have been compared with estimates by Dvorak's
technique applied by Satellite Division of IMD to visible and infrared (IR)
imageries of Kalpana satellite. The objective is to find out the difference in
estimates of location and intensity of cyclonic disturbances over the NIO by
different operational centres and the possible causes therein. The study can be
utilized in better interpretation of the satellite guidance available to cyclone
forecasters for determining the location and intensity of the cyclonic
disturbances.
2. Data and Methodology
To compare the centre and intensity of TCs determined using microwave
imageries by different agencies, six TCs generated over NIO during 2009-
2011 namely Aila, Bijli, Giri Jal, Keila and Thane were considered. TCs Aila,
Bijli, Giri, Jal and Thane originated over the Bay of Bengal whereas the TC
Keila originated over Arabian Sea. The track of these TCs are shown in Fig. 1
(Regional Specialised Meteorological Centre (RSMC), New Delhi, 2012).
The microwave imageries of the TCs were downloaded from the archive
of Navy NRL website and the centre and intensity of the TCs at different times
were determined without being biased with the centre/intensity determined by
Naval Research Laboratory (NRL), USA or Satellite Division on the basis of
Visible/IR imageries of Kalpana-1 satellite. Then the centre/intensity determined
Fig. 1: Tracks of TCs under consideration in the study.