Dr. Akhilesh Kumar Mishra Profile

Dr. Akhilesh Kumar Mishra

at Technion Israel Institute of Technology

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Proceedings Article | 3 December 2008 Paper

Adjustment of TRMM rainfall algorithm for monsoon land areas

Anu Simon, A. K. Mishra, T. N. Krishnamurti

Proceedings Volume 7148, 71480H (2008) https://doi.org/10.1117/12.806428

KEYWORDS: Meteorology, Microwave radiation, Ions, Data archive systems, Calibration, Data modeling, Statistical modeling, Climatology, Infrared radiation, Temporal resolution

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The TRMM 3B42 is a gridded 3 hourly data archive that is being provided to the research community at a horizontal resolution of 25 Km. These estimates are produced in four stages; (1) the microwave estimates precipitation are calibrated and combined, (2) infrared precipitation estimates are created using the calibrated microwave precipitation, (3) the microwave and IR estimates are combined, and (4) rescaling to monthly data is applied. Each precipitation field is best interpreted as the precipitation rate effective at the nominal observation time. These gridded estimates are on a 3-hour temporal resolution and a 0.25-degree by 0.25-degree spatial resolution in a global belt extending from 50°S to 50°N latitude. Given a rich data base (India Meteorological Department, IMD) of 2100 well distributed rain gauges over India (Rajeevan et. al. 2006), it is possible to reexamine the TRMM-3B42 data at a very high resolution (25 Km and 3 hours) over land areas. This is a statistical regression exercise which shows the local correction for the TRMM 3B42 rain over India. A further validation of this product is demonstrated from daily rainfall prediction using a suite of operational multimodels.

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