気象庁MSM風資料の精度評価  [in Japanese] ESTIMATING ACCURACY OF JMA-PROVIDED MSM-BASED WINDS DATA SAMPLES  [in Japanese]

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Abstract

近年,気象庁によりMSM(Meso Scale Model)に基づく日本周辺の高空間解像度風資料が公開されているが,海上風に関しては比較に用いるべき観測資料が不足していることから,その精度の検証は十分でない.本研究では,異なる期間をもつ10年前後のブイロボット観測風資料や衛星観測結果に基づくblended sea winds資料,さらにGPSブイにおける2台風時の観測風速資料を用いてMSM風資料の精度を間接的または直接的に検討した.得られた知見はつぎのようである.1)期間が異なる10年前後のblended sea winds資料とブイロボット観測風資料およびMSM風資料の相互比較から,MSM風資料がブイロボット観測風資料と概略で対応する特性が間接的に推測される.2)MSM風速は継続時間5日程度のGPSブイ観測風速に経時的に追従するが,減衰期には観測風速ほど急減せず,大きめの値を与える.

 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.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 72(2), I_336-I_341, 2016

    Japan Society of Civil Engineers

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