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Climate & Radiation
Geodesy and Geophysics
Wallops Field Support
New High Resolution Precipitation Products for Satellite Verification and Hydrological Applications
NASA/GSFC-Mesoscale Atmospheric Processes Laboratory, Chapman University
Wednesday, March 28, 2012 - 11:30
Quantifying accurate instantaneous rainfall intensities is important for many hydrological applications. Having accurate instantaneous precipitation reference products is also very important for verifying precipitation estimates from LEO satellites, which suffer from temporal sampling errors. In this presentation we will present comparisons between instantaneous rainfall rate fields retrieved from individual satellites and from high-resolution ground-based observations at overpass times (snapshot comparisons).
For the first time, instantaneous rainfall rate fields from the TRMM Precipitation Radar (PR) are compared with those from a dense gauge network. Can such an in situ verification indicate improvement in the new released PR products (V7 vs. V6)? Comparisons of instantaneous rainfall rate fields from the PR, passive microwave imagers and sounders carried by several satellites and those from the NOAA/NSSL high-resolution national mosaics (Q2), also will be presented. The Q2 products include the NSSL radar-only national mosaics, and the gauge adjusted radar national mosaics, which we have developed. The Q2 and the new gauge-adjusted products provide a breakthrough in the accuracy of large-scale high-resolution surface reference data available for various hydrological applications, and for verification of satellite snapshot observations. Additional improvement is expected by integrating the PR data into these reference products.
Eyal Amitai received the M.Sc. and Ph.D. degrees in atmospheric sciences from the Hebrew University of Jerusalem, Israel, in 1991 and 1996, respectively. Since 1996, he has been working at NASA GSFC, with the Precipitation Measurement Missions. He spent two years on a postdoctoral fellowship with USRA. From 1998 to 2002, he was a research faculty with UMBC. From 2003 to 2008, he was a Research Professor with the Center for Earth Observing and Space Research at GMU. Since 2008, he has been with Chapman University, Orange, CA. Currently, he is a member of the NASA PMM and NEWS science teams. He serves as a PI on NASA and NSF grants and Co-I on several other grants. His research interests include hydrometeorology, radar hydrology, and remote sensing of precipitation from space, ground, and underwater platforms. His research is focused on combining information from a variety of sensors to evaluate and improve precipitation estimates.