Satellite derived precipitation and freshwater flux variability and its dependence on the North Atlantic Oscillation
Satellite derived precipitation and freshwater flux variability and its dependence on the North Atlantic Oscillation
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卫星得出的降水和淡水通量变化及其对北大西洋涛动的依赖性
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
H. Grassl
中科院分区：
文献类型：
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作者：
A. Andersson;S. Bakan;H. Grassl
摘要对“汉堡海洋大气参数和卫星数据通量”（HOAPS）卫星反演降水和淡水通量的变化进行了评估，特别强调了“北大西洋涛动”（NAO）。为了覆盖陆地地区，使用了一种新的组合，将卫星导出的降水气候学与基于雨量计的“全球降水气候学中心”（GPCC）的“全数据再分析产品版本4”相结合。这产生了独特的高分辨率，准全球降水场从两个独立的数据源编译。在海洋上，淡水平衡和相关参数的NAO的响应进行了研究，首次使用一个纯粹的卫星数据集。在天气尺度上，这与其它卫星和再分析产品的早期发现是一致的。此外，HOAPS-3/GPCC组合数据集的一致性还允许对降水模式进行详细的区域分析。HOAPS-3的淡水通量对NAO的响应在中高纬地区以降水为主，而在亚热带地区则以蒸发反馈为主。
Abstract The variability of satellite retrieved precipitation and freshwater flux from the ‘Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data’ (HOAPS) is assessed with special emphasis on the ‘North Atlantic Oscillation’ (NAO). To cover also land areas, a novel combination of the satellite derived precipitation climatology with the rain gauge based ‘Full Data Reanalysis Product Version 4’, of the ‘Global Precipitation Climatology Centre’ (GPCC) is used. This yields unique high-resolution, quasi-global precipitation fields compiled from two independent data sources. Over the ocean, the response of the freshwater balance and the related parameters to the NAO is investigated for the first time by using a purely satellite based data set. A strong dependence of precipitation patterns to the state of the NAO is found. On synoptic scale this is in accordance with earlier findings by other satellite based and reanalysis products. Furthermore, the consistency of the combined HOAPS-3/GPCC data set allows also detailed regional analyses of precipitation patterns. The response of HOAPS-3 freshwater flux to the NAO is dominated by precipitation at mid and high latitudes, while for the subtropical regions the feedback of the evaporation is stronger.