资源与生态学报 ›› 2012, Vol. 3 ›› Issue (4): 359-366.DOI: 10.5814/j.issn.1674-764x.2012.04.009

• 论文 • 上一篇    下一篇

TRMM 3B42降水产品在鄱阳湖流域梅川江子流域的精度评价

刘军志1,2, 朱阿兴1,3, 段峥4   

  1. 1 中国科学院地理科学与资源研究所 资源与环境信息系统国家重点实验室, 北京100101;
    2 中国科学院大学, 北京 100049;
    3 威斯康星大学(麦迪逊)地理系, 威斯康星州, WI 53706, 美国;
    4 代尔夫特理工大学, 代尔夫特, 2628 CN, 荷兰
  • 收稿日期:2012-11-08 修回日期:2012-12-05 出版日期:2012-12-30 发布日期:2012-12-29
  • 通讯作者: ZHU A-Xing. Email: axing@lreis.ac.cn.

Evaluation of TRMM 3B42 Precipitation Product Using Rain Gauge Data in Meichuan Watershed, Poyang Lake Basin, China

LIU Junzhi1,2, ZHU A-Xing1,3, DUAN Zheng4   

  1. 1 State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Department of Geography, University of Wisconsin-Madison, Madison, WI 53706, USA;
    4 Delft University of Technology, Delft, 2628 CN, Netherlands
  • Received:2012-11-08 Revised:2012-12-05 Online:2012-12-30 Published:2012-12-29
  • Supported by:

    the State High-Tech Development Plan of China (No. 2011AA120305) and the National Natural Science Foundation of China (No. 41023010).

摘要: 在鄱阳湖流域的梅川江子流域,利用52个站点9年(2001-2005及2007-2010)的日降水数据对V6和V7两个版本的TRMM 3B42降水产品进行了精度评价。该评价针对多个时空尺度进行,包括栅格和流域两个空间尺度,日、月和年三个时间尺度。为避免尺度不匹配问题,本文利用泰森多边形方法将点尺度的站点观测数据转换到与TRMM数据相同的栅格尺度。评价结果表明,V6和V7两个版本的TRMM 3B42降水产品差别较小,整体上均轻微高估了降水量(偏差均为0.04)。在日尺度,栅格和流域空间尺度上V6和V7 TRMM 3B42降水产品的精度均较差,相对均方根误差在135%-199%之间。因此,在该地区利用3B42数据进行日尺度的水文分析前需要对其进行校正。在月和年尺度,栅格和流域两个空间尺度上V6和V7两个版本的TRMM 3B42降水产品精度均较高,决定系数达到0.91-0.99,相对均方根误差在4%-23%之间。这表明TRMM 3B42降水产品在该地区月和年尺度的水文分析方面具有很好的应用前景。

关键词: 降水, TRMM 3B42, 泰森多边形, 精度评价, 鄱阳湖流域

Abstract: This study evaluated Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA) product i.e. TRMM 3B42 data, using data from 52 rain gauge stations around the Meichuan watershed, which is a representative watershed of Poyang Lake basin in China. Both the latest Version 7 (V7) and previous Version 6 (V6) of TRMM 3B42 data were compared and evaluated for a 9-year period covering 2001-2005 and 2007-2010. The evaluations were conducted at different spatial (grid and watershed) and temporal (daily, monthly and annual) scales. For evaluation at grid scale, the Thiessen polygon method was used to transform pointed-based rain gauge data to areal precipitation at the same grid scale (0.25°) as TRMM 3B42 data. The results showed that there was little difference in performances of V6 and V7 TRMM 3B42 products. Overall, both V6 and V7 products slightly overestimated precipitation with a bias of 0.04. At daily scale, both V6 and V7 data were considered to be unreliable with large relative RMSE (135%-199%) at the two spatial scales, and they were deficient in capturing large storms. These results suggest that local calibration with rain gauge data should be conducted before V6 and V7 TRMM 3B42 data are used at daily scale. At monthly and annual scales, V6 and V7 TRMM 3B42 data match the rain gauge data well (R2 = 0.91-0.99, relative RMSE = 4%-23%) at both grid and watershed scale and thus have good potential for hydrological applications.

Key words: precipitation, TRMM 3B42, Thiessen polygons, evaluation, Poyang Lake