TRMM卫星降水产品在南流江流域的精度评估
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摘要
为了评估TRMM 3B42-V7的两套卫星降水反演数据产品的精度,选取南流江流域的常乐水文站以上集水区域为研究区域,以雨量站点的观测资料为参考,采用相关系数、探测率等指标,以及绘制空间降雨量分布图,建立评价模型。结果表明,两套卫星降雨产品都存在高估降雨量的现象,日尺度降雨量相对偏差在5%左右,且流域内有区域性差别;整体上TRMM3B42V7降雨产品的精度优于TRMM3B42RTV7,前者TRMM3B42V7降雨产品存在一定误差,但在缺乏地面降雨资料的地区仍具有应用价值。
In order to evaluate Version-7 TRMM3B42 multi-satellite precipitation analysis (TMPA) products including nearreal-time products (3B42RTV7) and post-real-time research products (3B42V7) via comparison with the rain gauge observations, the area controlled by the Changle Hydrologic Station in upper Nanliu River Basin is selected as the study area.By using the indicators of correlation coefficient and detection rate and drawing spatial rainfall distribution maps, the evaluation model is established. The results show that, (a) there is an overestimation of rainfall between two TRMM multi-satellite rainfall products, and the relative bias of daily rainfall is about 5% at daily scale and there are regional differences in the basin; and (b) the accuracy of TRMM3B42V7 rainfall product is better than that of TRMM3B42RTV7 as a whole, In summary, there is some error in TRMM3B42V7 rainfall product, but it still has application value in areas lacking rainfall data.
In order to evaluate Version-7 TRMM3B42 multi-satellite precipitation analysis (TMPA) products including nearreal-time products (3B42RTV7) and post-real-time research products (3B42V7) via comparison with the rain gauge observations, the area controlled by the Changle Hydrologic Station in upper Nanliu River Basin is selected as the study area.By using the indicators of correlation coefficient and detection rate and drawing spatial rainfall distribution maps, the evaluation model is established. The results show that, (a) there is an overestimation of rainfall between two TRMM multi-satellite rainfall products, and the relative bias of daily rainfall is about 5% at daily scale and there are regional differences in the basin; and (b) the accuracy of TRMM3B42V7 rainfall product is better than that of TRMM3B42RTV7 as a whole, In summary, there is some error in TRMM3B42V7 rainfall product, but it still has application value in areas lacking rainfall data.
引文
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[2]王兆礼,钟睿达,赖成光,等.TRMM卫星降水反演数据在珠江流域的适用性研究---以东江和北江为例[J].水科学进展,2017,28(2):174-182.
[3]唐国强,李哲,薛显武,等.赣江流域TRMM遥感降水对地面站点观测的可替代性[J].水科学进展,2015,26(3):340-346.
[4]DINKU T,ANAGNOSTOU E N,BORGA M.Improving radar-based estimation of rainfall over complex terrain[J].Journal of Applied Meteorology,2002,41(12):1163-1178.
[5]江善虎,任立良,雍斌,等.TRMM卫星降水数据在洣水流域径流模拟中的应用[J].水科学进展,2014,25(5):641-649.
[6]BITEW M M,GEBREMICHAEL M,GHEBREMICHAEL L T,et al.Evaluation of high-resolution satellite rainfall products through streamflow simulation in a hydrological modeling of a small mountainous watershed in Ethiopia[J].Journal of Hydrometeorology,2012,13(1):338-350.
[7]杨云川.遥感卫星TRMM降雨数据融合及其在流域水文模拟中的应用[D].北京:中国科学院大学,2013.
[8]陈志敏.TRMM卫星降雨数据在ESSI分布式水文模型淮河流域水文过程模拟中的应用[D].南京:南京大学,2014.
[9]YONG B,CHEN B,GOURLEY J J,et al.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 extr[J].Journal of Hydrology,2014,508(2):77-87.
[10]杨云川,程根伟,范继辉,等.卫星降雨数据在高山峡谷地区的代表性与可靠性[J].水科学进展,2013,24(1):24-33.
[11]ZENG Hongwei,LI Lijuan,LI Jiuyi.The evaluation of TRMM multisatellite precipitation analysis(TMPA)in drought monitoring in the Lancang River Basin[J].Journal of Geographical Sciences,2012,22(2):273-282.
[12]CHEN S,HONG Y,CAO Q,et al.Similarity and difference of the two successive V6 and V7 TRMM multisatellite precipitation analysis performance over China[J].Journal of Geophysical Research:atmospheres,2013,118(23):13060-13074.