Ram Mohan, H S; Santosh, K R; Sajith, V(American Geophysical Union, 2003)
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Abstract:
TRMM Microwave Imager (TMI) is reported to be a
useful sensor to measure the atmospheric and oceanic
parameters even in cloudy conditions. Vertically integrated
specific humidity, Total Precipitable Water (TPW) retrieved
from the water vapour absorption channel (22GHz.) along
with 10m wind speed and rain rate derived from TMI is
used to investigate the moisture variation over North Indian
Ocean. Intraseasonal Oscillations (ISO) of TPW during the
summer monsoon seasons 1998, 1999, and 2000 over North
Indian Ocean is explored using wavelet analysis. The
dominant waves in TPW during the monsoon periods and
the differences in ISO over Arabian Sea and Bay of Bengal
are investigated. The northward propagation of TPW
anomaly and its coherence with the coastal rainfall is also
studied. For the diagnostic study of heavy rainfall spells
over the west coast, the intrusion of TPW over the North
Arabian Sea is seen to be a useful tool.