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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.38 [2009] >
IJRSP Vol.38(6) [December 2009] >
| Title: | Atmospheric stability estimation using radio occultation data over India and surrounding region |
| Authors: | Sharma, Neerja
Jagadheesha, D
Joshi, P C
Pal, P K |
| Keywords: | Radio occultation data
Atmospheric stability indices
Refractivity index
Rainfall intensity |
| Issue Date: | Dec-2009 |
| Publisher: | CSIR |
| PACS No.: | 92.40.eg; 95.10.Gi |
| Abstract: |
The paper presents analysis of occurrence
and intensity of rainfall with the lifted index (LI), total precipitable water
(TPW), average relative humidity (ARH) and average refractivity (RI) derived
from radio occultation (RO) data. Constellation Observing System has been used
for meteorology, ionosphere and climate (COSMIC) refractivity and 1-d
variational assimilation retrievals of pressure, temperature and water vapour
pressure during May-August 2007 over India and the surrounding region.
The results mainly indicate that RO data can be a sensitive measure of
rainfall. LI, TPW and ARH together are linked to give 90% probability of
occurrence of rainfall events. Almost similar probability of rainfall
occurrence and its intensity is captured when RI is used in place of LI. The
results emphasize that RO average refractivity (above a certain threshold) is a
measure of instability of the atmosphere and can be used as stability index
instead of LI. RI in combination with moisture indices is able to give
potential signature of rainfall occurrence and its intensity.
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| Page(s): | 317-325 |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.38(6) [December 2009]
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