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3DVAR Assimilation of Saphir Radiance from Meghatropiques : Case Study of A Heavy Rainfall events over South Indian Peninsula

Publication Type : Conference Paper

Thematic Areas : Wireless Network and Application

Publisher : High Impact Weather Events and their prediction over the SAARC Region, At New Delhi, India, March 2013

Source : SAARC seminar on High Impact Weather Events and their prediction over the SAARC Region

Campus : Amritapuri

School : School of Physical Sciences

Center : Amrita Center for Wireless Networks and Applications (AmritaWNA)

Department : Physics

Verified : Yes

Year : 2013

Abstract : The Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) and Precipitation Radar (PR) have enhanced the accuracy of rainfall estimation from satellites over ocean and land. An algorithm to merge TRMM Multi-satellite Precipitation Analysis (TMPA) satellite estimates with the India Meteorological Department (IMD) rain-gauge values is tested for the Indian monsoon region. A daily merged gauge and satellite data product (NMSG) at 1° latitude-longitude resolution for the Indian monsoon region is prepared to depict the large-scale aspects of monsoon rainfall. The satellite product used as a first guess is the TRMM TMPA for daily estimates. Incorporation of IMD gauge data corrects the mean biases of the TMPA values. TMPA alone is able to depict the space-time distribution of monsoon rainfall patterns. The merging of gauge data enhances the value of the satellite information; therefore, the NMSG is more representative than TMPA. Daily, monthly, and seasonal fields are prepared and compared with the land-only gridded data of the India Meteorological Department National Climate Centre (IMDNCC) at the same resolution. This inter-comparison with another independent dataset confirms the utility of the NMSG, produced by this objective analysis algorithm. The comparison of the merged data with the TMPA data reveals the regions where the satellite estimates have mean biases. Objective statistical scores also confirm the goodness of NMSG. The NMSG data are meant for use in verification of large-scale rainfall features from numerical models for the monsoon region.

Cite this Research Publication : Chandrasekar and Dhanya M., "3DVAR Assimilation of Saphir Radiance from Meghatropiques : Case Study of A Heavy Rainfall events over South Indian Peninsula", in High Impact Weather Events and their prediction over the SAARC Region, At New Delhi, India, March 2013, 2013.

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