ESTIMATING ACCURACY OF JMA-PROVIDED MSM-BASED WINDS DATA SAMPLES

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  • 気象庁MSM風資料の精度評価

Abstract

 In recent years, MSM(Meso-Scale Model)-based analysis and prediction winds data sets with a high space resolution have been open to public domain by JMA(Japan Meteorological Agency), but validation for accuracy of sea winds in the data sets may not be satisfactory because of the lack of observed sea winds data to be used in the comparison. This study investigates implicitly and explicitly the accuracy of MSM winds data, in cases where not only JMA buoy robot-based winds data and blended winds product based on satellite observation associated with around a 10-year different period but also GPS buoy-based wind speed data during typhoons with 5-day duration are used for the comparison. The main findings are as follows; 1)It may be indirectly deduced that MSM winds data are in rough agreement with JMA buoy winds data on the basis of both the comparison between JMA buoy winds data and blended winds data and the comparison between MSM winds data and blended winds data. 2)MSM wind speed data follows the GPS buoy wind speed data well for its time variation during a typhoon but gives larger values due to a slower decrease at the decaying stage.

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