Kakeru OKURA
A study of better estimation of surface wind speed using mesoscale meteorological numerical simulation model
Toshiro KUMAKURA
Because surface wind speed is essential to estimate accurate snowfall amount, the wind speed should be observed. Unfortunately, many meteorological stations do not observe it. Then we attempt to estimate the wind speed using a meteorological numerical simulation model at five meteorological stations, Kashiwazaki, Takada, Nagaoka, Yuzawa, and Tsunan, with dynamic adaptation, which is iteratively performed on time step and leads temporal snap shot of dynamical condition of atmosphere using constant initial condition and constant boundary condition at the time of the snap shot. The result shows that the mean error is 0.4m/s and the rout mean square error is 1.7m/s under the condition of the observed weekly-averaged wind speed 2.8m/s. And we calculate the hourly snow water equivalent (SWE) over one week using the snowfall amount which is corrected by both of observed and estimated wind speed. The result of weekly-accumulated SWEs shows that the error rate of SWE (using estimated wind) is about 5% of SWE (using observed wind) 172 kg/m2.
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