Abstract
Radar estimates of rainfall are in general subject to several sources of systematic error, which can have a significant detrimental effect on radar data quality. We investigate here several schemes that attempt to compensate for some of these systematic errors by applying a constant, radar domain wide, multiplicative correction factor utilising rain gauge data. The schemes under investigation are the current gauge adjustment scheme applied operationally in the Nimrod radar correction scheme at The Met. Office, a scheme recently developed at the National Weather Service (NWS) in the US, and a modified version of the NWS scheme. The Nimrod scheme calculates the gauge adjustment factor on a weekly basis, with the adjustment factor being updated only if sufficient data has accumulated. The NWS and modified NWS schemes calculate the adjustment factor hourly using a Kalman filter. We present here preliminary results from the evaluation of these schemes performed using hourly rain gauge and radar data from the UK radar and rain gauge networks.
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