北海、挪威海和巴伦支海的高分辨率风浪后报
A high-resolution hindcast of wind and waves for The North Sea, The Norwegian Sea and The Barents Sea
摘要：
基于ERA-40再分析的高分辨率大气降尺度和波浪后报，覆盖了挪威海、北海和巴伦支海。所涉期间为1957年9月至2002年8月。动态大气降尺度是作为一系列短期预报运行进行的，这些运行是从ERA-40和以前的预报运行的混合中初始化的，以保留高分辨率模式的精细尺度表面特征，同时保持ERA-40的大尺度天气场。嵌套WAM波模型后报包括一个粗略的50公里的模式，覆盖北大西洋强迫与ERA-40风和嵌套的10-11公里分辨率的模式强迫与降尺度风。与现场和卫星观测的风和海况的比较表明，在ERA-40上，风矢量的平均值和上风向以及显着的波高有显着的改善。平均波周期也有所改善。ERA-40在风速和显着波高方面存在偏差，这种偏差不会通过缩小尺度来重现。大气降尺度也再现了ERA-40无法分辨的极地低压，但由于降尺度无法捕捉其整个生命周期，因此这些低压太弱且持续时间短。
英文摘要：
A combined high-resolution atmospheric downscaling and wave hindcast based on the ERA-40 reanalysis covering the Norwegian Sea, the North Sea and the Barents Sea is presented. The period covered is from September 1957 to August 2002. The dynamic atmospheric downscaling is performed as a series of short prognostic runs initialized from a blend of ERA-40 and the previous prognostic run to preserve the fine-scale surface features from the high-resolution model while maintaining the large-scale synoptic field from ERA-40. The nested WAM wave model hindcast consists of a coarse 50 km model covering the North Atlantic forced with ERA-40 winds and a nested 10-11 km resolution model forced with downscaled winds. A comparison against in situ and satellite observations of wind and sea state reveals significant improvement in mean values and upper percentiles of wind vectors and the significant wave height over ERA-40. Improvement is also found in the mean wave period. ERA-40 is biased low in wind speed and significant wave height, a bias which is not reproduced by the downscaling. The atmospheric downscaling also reproduces polar lows, which can not be resolved by ERA-40, but the lows are too weak and short-lived as the downscaling is not capable of capturing their full life cycle.
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