Impact of the surface wind flow on precipitation characteristics over the southern Himalayas: GPM observations
Impact of the surface wind flow on precipitation characteristics over the southern Himalayas: GPM observations
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DOI：
10.1016/j.atmosres.2017.11.001
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发表时间：
2018-04
影响因子：
5.5
通讯作者：
A. Zhang;Yunfei Fu;Yilun Chen;Guosheng Liu;Xiangdong Zhang
中科院分区：
文献类型：
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作者：
A. Zhang;Yunfei Fu;Yilun Chen;Guosheng Liu;Xiangdong Zhang
在区域和全球尺度上研究了南喜马拉雅地区降水的分布和影响。然而，以前的研究由于对降水触发因素的重视不足或缺乏液滴尺寸分布(DSD)数据而受到限制。在这里，利用全球降水任务的双频雷达数据确定了降水系统，然后根据欧洲中期天气预报中期数据中心的地表流量将其分为五类。引入面流来指示降水的触发，这在本研究中得到了验证。通过个例和统计分析表明，不同地表流量的降水系统具有不同的降水特征，包括时空特征、反射率廓线、DSD和降雨强度。此外，模拟结果还表明，地表径流来源对降水的强度和DSD有影响。地形对五类降水系统的影响不同，导致了南喜马拉雅地区降水特征的不同分布。我们的结果表明，面流和降水系统的DSD的引入提供了对喜马拉雅南部复杂降水的洞察。降水系统的不同特征可能是由地表水流引起的。因此，今后对地形降水的研究应考虑地表径流的影响及其动力机制。
The distribution and influence of precipitation over the southern Himalayas have been investigated on regional and global scales. However, previous studies have been limited by the insufficient emphasis on the precipitation triggers or the lack of droplet size distribution (DSD) data. Here, precipitating systems were identified using Global Precipitation Mission dual-frequency radar data, and then categorized into five classes according to surface flow from the European Centre for Medium-Range Weather Forecast Interim data. The surface flow is introduced to indicate the precipitation triggers, which is validated in this study. Using case and statistical analysis, we show that the precipitating systems with different surface flow had different precipitation characteristics, including spatio-temporal features, reflectivity profile, DSD, and rainfall intensity. Furthermore, the results show that the source of the surface flow influences the intensity and DSD of precipitation. The terrain exerts different impacts on the precipitating systems of five categories, leading to various distributions of precipitation characteristics over the southern Himalayas. Our results suggest that the introduction of surface flow and DSD for precipitating systems provides insight into the complex precipitation of the southern Himalayas. The different characteristics of precipitating systems may be caused by the surface flow. Therefore, future study on the orographic precipitations should take account the impact of the surface flow and its relevant dynamic mechanism.