Comparison of NEXRAD, modified NEXRAD, and Nimrod gauge adjustement schemes
GIBSON, M.
The Nimrod radar processing system applies a radar domain wide gauge adjustment factor to radar data in order to reduce biases in the radar data due to sensitivity problems and calibration errors. Some weaknesses have been identified in the scheme currently used and an investigation has been carried out into alternative methods based on a scheme developed under the NEXRAD program by the National Weather Service (NWS) in the US. This investigation has shown that the schemes based on the NEXRAD method are effective at reducing errors in the radar data and perform significantly better than the current Nimrod scheme. The modified NEXRAD scheme is particularly effective at reducing errors in the radar data (the RMSf for all radars for 0-100 km range is 2.28 compared with 2.36 from the Nimrod gauge adjustment scheme). It would be beneficial to Nimrod rainrate products if the modified NEXRAD scheme were implemented in place of the current Nimrod gauge adjustment scheme.
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