Effectiveness of WRF wind direction for retrieving coastal sea surface wind from synthetic aperture radar
Effectiveness of WRF wind direction for retrieving coastal sea surface wind from synthetic aperture radar
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DOI：
10.1002/we.1526
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发表时间：
2013-09
期刊：
影响因子：
4.1
通讯作者：
Yuko Takeyama;T. Ohsawa;K. Kozai;C. Hasager;Merete Badger
中科院分区：
文献类型：
--
作者：
Yuko Takeyama;T. Ohsawa;K. Kozai;C. Hasager;Merete Badger
孔径雷达DTU Orbit（2018年12月29日）WRF风向对从合成孔径雷达（SAR）图像反演沿海海面风的有效性风向需要作为地球物理模型函数（GMF）的输入，以便从合成孔径雷达（SAR）图像反演海面风速。本研究验证了使用从天气研究和预报模式（WMF）获得的风向作为输入到GMF的有效性，以检索精确的风场在沿海沃茨邻近复杂的陆上地形。基于日本海上平台的实测数据，对42幅ENVISAT ASAR图像反演的风速进行了验证。精度还与使用风向的情况进行了比较：日本气象厅（MANAL）的中尺度分析，QuikSCAT上的SeaWinds微波散射仪和国家环境预测中心最终业务全球分析数据（NCEP FNL）。与使用WRF，MANAL，QuikSCAT和NCEP FNL风向获得的SAR反演风速的误差相比，误差的大小似乎与风向本身的误差无关。除风向外，地形因素被认为是除风向外的主要误差来源。专注于陆上风（从海上吹到陆地），风速的均方根误差为0.75 m s-1（原位），0.96 m s-1（WRF），1.75 m s-1（MANAL），1.58 m s-1（QuikSCAT）和2.00 m s − 1（NCEP FNL），但由于案例数量较少，不确定性具有相同的数量级。这些结果表明，虽然使用准确的WRF风向的风反演的有效性得到了部分证实，进一步的努力，以消除由于风向以外的因素，在沿海沃茨更准确的风反演的误差是必要的。版权所有© 2012约翰威利父子有限公司.
aperture radar DTU Orbit (29/12/2018) Effectiveness of WRF wind direction for retrieving coastal sea surface wind from synthetic aperture radar Wind direction is required as input to the geophysical model function (GMF) for the retrieval of sea surface wind speed from a synthetic aperture radar (SAR) images. The present study verifies the effectiveness of using the wind direction obtained from the weather research and forecasting model (WMF) as input to the GMF to retrieve accurate wind fields in coastal waters adjacent to complex onshore terrain. The wind speeds retrieved from 42 ENVISAT ASAR images are validated based on in situ measurements at an offshore platform in Japan. Accuracies are also compared with cases using wind directions: the meso‐analysis of the Japan Meteorological Agency (MANAL), the SeaWinds microwave scatterometer on QuikSCAT and the National Center for Environmental Prediction final operational global analysis data (NCEP FNL). In comparison with the errors of the SAR‐retrieved wind speeds obtained using the WRF, MANAL, QuikSCAT and NCEP FNL wind directions, the magnitudes of the errors do not appear to be correlated with the errors of the wind directions themselves. In addition to wind direction, terrain factors are considered to be a main source of error other than wind direction. Focusing on onshore winds (blowing from the sea to land), the root mean square errors on wind speed are found to be 0.75 m s − 1 (in situ), 0.96 m s − 1 (WRF), 1.75 m s − 1 (MANAL), 1.58 m s − 1 (QuikSCAT) and 2.00 m s − 1 (NCEP FNL), respectively, but the uncertainty is of the same order of magnitude because of the low number of cases. These results indicate that although the effectiveness of using the accurate WRF wind direction for the wind retrieval is partly confirmed, further efforts to remove the error due to factors other than wind direction are necessary for more accurate wind retrieval in coastal waters. Copyright © 2012 John Wiley & Sons, Ltd.