This paper investigates the validity of the method used in the Japanese offshore wind map (NeoWins) to seamlessly connecting satellite‐derived wind speed for open oceans to mesoscale model‐simulated wind speed for coastal waters. In the NeoWins, the former was obtained from the satellite‐borne Advanced Scatterometer (ASCAT), and the latter was obtained from numerical simulations using the Weather Research and Forecasting (WRF) model. In this study, the consistency of the ASCAT and WRF 10‐m height wind speeds is examined in their overwrapping areas. The comparison between ASCAT and WRF model reveals that their differences in annual mean wind speed are mostly within ±5% and that the ASCAT annual mean wind speed is, as a whole, slightly higher than the WRF annual mean wind speed. The results indicate that there are no large wind speed gaps between WRF and ASCAT in most parts of the Japanese offshore areas. It is moreover found that the discrepancies between the two wind speeds are due to two factors: one is the existence of winter sea ice in the ASCAT observation in the Sea of Okhotsk in ASCAT observation and the other is that the accuracy of the WRF wind speed depends on atmospheric stability.

中文翻译：

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日本海上风资源图的高级散射仪与天气研究和风速预测的比较

本文研究了日本离岸风图（NeoWins）中用于将卫星衍生的大洋风速无缝连接到中尺度模型模拟的沿海风速的方法的有效性。在NeoWins中，前者是从星载高级散射仪（ASCAT）获得的，后者是从使用Weather Research and Forecasting（WRF）模型的数值模拟获得的。在本研究中，检查了ASCAT和WRF 10-m高风速在其包裹区域内的一致性。ASCAT和WRF模型之间的比较表明，它们的年平均风速差异大多在±5％之内，并且ASCAT年平均风速总体上略高于WRF的年平均风速。结果表明，在日本近海大部分地区，WRF和ASCAT之间没有较大的风速差距。此外，发现两个风速之间的差异是由于两个因素造成的：一个是ASCAT观测的鄂霍次克海ASCAT观测中存在冬季海冰，另一个是WRF风速的准确性取决于大气的稳定性。