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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.39 [2010] >
IJMS Vol.39(4) [December 2010] >
| Title: | Impact of global warming on cyclonic storms over north Indian Ocean |
| Authors: | Ramesh Kumar, M R.
Sankar, S |
| Keywords: | Global warming
Arabian Sea
Bay of Bengal
Sea surface temperature |
| Issue Date: | Dec-2010 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | The impact of global warming on the cyclonic storms over the north Indian
Ocean have been studied using a suite of multiple datasets that includes the
NCEP/NCAR Reanalysis, the extended reconstruction sea surface temperature
(ERSST) and tracks of storms over the north Indian Ocean for the period 1951 to
2007. Results suggest that the frequency of storms and severe storms do
not show a dramatic rise in-spite of substantial increase in the sea surface
temperature in the Bay of Bengal from 1951-2007 compared to the 1901-1951. This
prompted us to conclude that, the frequency of storms is related to the changes
in a couple of atmospheric parameters over the north Indian Ocean during the
global warming period. It is identified that there is a large decrease in the
mid-tropospheric humidity over the Bay of Bengal during the latter period
(1951-2007). The relationship between the SST over the Bay of Bengal and the
maximum wind speed of the cyclonic systems is complex and there is no preferred
range for the formation of cyclonic or severe cyclonic storms over the north
Indian Ocean. Examination of various aspects related to storms in the present
study revealed that warm SST’s alone are not sufficient for the initiation of
convective systems over the Bay of Bengal. The present study thus suggests that
atmospheric parameters, such as low-level vorticity, mid-tropospheric humidity
and vertical wind shear, play an influential role on the genesis and intensification
of storms over the north Indian Ocean. The present study assumes significance
due to the large contribution of rainfall over India from storms that form over
the north Indian Ocean during the summer and the winter monsoons. |
| Page(s): | 516-520 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.39(4) [December 2010]
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