A combined passive-active microwave retrieval of quantitative rainfall from Topex/Poseidon radar altimeter and Topex microwave radiometer

Synergistic measurements of both active and passive nadir looking microwave sensors onboard Topex/Poseidon (T/P) satellite are explored for their instantaneous rain estimation capability over tropical oceans. Data of T/P altimeter (the differential radar backscatter at C and Ku band frequencies, i.e...

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Bibliographic Details
Published in:International journal of remote sensing 2005-04, Vol.26 (8), p.1729-1753
Main Authors: Gairola, R. M., Pokhrel, S., Varma, A. K., Agarwal, Vijay K.
Format: Article
Language:English
Subjects:
Applied geophysics
Earth sciences
Earth, ocean, space
Exact sciences and technology
Internal geophysics
Marine geology
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Summary:Synergistic measurements of both active and passive nadir looking microwave sensors onboard Topex/Poseidon (T/P) satellite are explored for their instantaneous rain estimation capability over tropical oceans. Data of T/P altimeter (the differential radar backscatter at C and Ku band frequencies, i.e. δσ° = σ° C −σ° Ku ), and Topex microwave radiometer (TMR) (brightness temperatures at 18, 21 and 37 GHz frequencies) coincident with special sensor microwave/imager (SSM/I) and tropical rainfall measuring mission (TRMM)-microwave radiometer (TMI) have been analysed for this purpose. The rainfall response has been separated from the surface variability and atmospheric water content (in terms of water vapour and liquid water), by analysing the TMR data in view of the radiative response of its channels under different ocean-atmospheric conditions over the Indian oceanic region. Among a large collocated data on different spatial and temporal scales, the most restrictive criteria (
ISSN:0143-1161
1366-5901
DOI:10.1080/01431160512331326585