Intercomparison of the Version-6 and Version-7 TMPA precipitation products over high and low latitudes basins with independent gauge networks: Is the newer version better in both real-time and post-real-time analysis for water resources and hydrologic ext
Intercomparison of the Version-6 and Version-7 TMPA precipitation products over high and low latitudes basins with independent gauge networks: Is the newer version better in both real-time and post-real-time analysis for water resources and hydrologic ext
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TMPA 6版和7版独立监测网络高低纬度流域降水产品对比：新版本在水资源和水文延伸的实时和后实时分析方面是否更好
DOI：
10.1016/j.jhydrol.2013.10.050
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发表时间：
2014
影响因子：
6.4
通讯作者：
Luyan Gong
中科院分区：
文献类型：
--
作者：
Bin Yong;Bo Chen;Jonathan J.Gourley;Liliang Ren;Yang Hong;Xi Chen;Weiguang Wang;Sheng Chen;Luyan Gong
2013年初，TRMM多卫星降水分析系统进行了一次重要升级，正式发布了最新的版本7 TMPA产品。在这项研究中，利用独立的量规观测网络对位于不同纬度带的中国两个具有代表性的盆地进行了为期7年(2003年至2009年)的TMPA连续版本的评估和比较。研究的TMPA产品是版本6和版本7实时3B42RT估计(RTV6和RTV7)和后实时3B42估计(版本6和V7)。评估表明，在低纬密水盆地的系统偏差方面，RTV7比RTV6有了很大的改进，达到了与经量规调整的研究产品类似的精度水平。但是，在高纬度的老哈河盆地没有发现这样的改进，这表明目前的版本7 TMPA实时估计在高纬度仍然有很大的改进空间。另一方面，后实时研究产品V7有望为未测量区域的水资源管理提供更好的降水信息，其表现通常优于两个测量流域的V6，并在四个标准TMPA估计中表现最好。季节分析表明，新的Version-7算法显著降低了低纬密水盆地冬季月降水与实测值之间的偏差，但不能有效缓解高纬老哈河流域冬季降水的严重高估。研究还表明，所有的TMPA产品都严重低估了密水流域的高降雨率，特别是夏季的强台风事件。因此，在对洪水或山体滑坡等与强降雨有关的水文极端情况进行模拟和预测时，应谨慎使用当前版本7的TMPA产品。
The TRMM Multi-satellite Precipitation Analysis (TMPA) system underwent an important upgrade in early 2013, at which the newest Version-7 TMPA products were formally released. In this study, the TMPA successive versions, original Version-6 and current Version-7, were evaluated and intercompared by using independent gauge observation networks for a 7-yr (2003–09) period over two representative basins in China at different latitude bands. The TMPA products studied are the Version-6 and Version-7 real-time 3B42RT estimates (RTV6 and RTV7) and post-real-time 3B42 estimates (V6 and V7). Assessments indicate that RTV7 represents a substantial improvement over RTV6 with respect to the systematic bias in the low-latitude Mishui basin, reaching similar accuracy levels as with the gauge-adjusted research products. But, such improvement was not found in the high-latitude Laohahe basin, suggesting that the current Version 7 TMPA real-time estimates still have much room for improvement at high latitudes. On the other hand, the post-real-time research product V7, which is expected to provide better precipitation information for water resources management in ungauged regions, generally outperforms V6 over both gauged basins and has the best performance among the four standard TMPA estimates. The seasonal analyses show that the new Version-7 algorithm notably reduces the bias between TMPA and observations during winter months for the low-latitude Mishui basin, but fails to effectively alleviate the serious overestimation for winter precipitation occurring in the high-latitude Laohahe basin. The study also reveals that all the TMPA products significantly underestimate high rain rates over the Mishui basin, especially for strong typhoon events during summer. Thus, caution should be exercised when applying the current Version-7 TMPA products for simulation and prediction of hydrologic extremes associated with heavy rainfall, such as floods or landslides.