地理科学进展

地理科学进展 ›› 2012, Vol. 31 ›› Issue (9): 1164-1170.doi: 10.11820/dlkxjz.2012.09.007

• 水文与气象过程 • 上一篇    下一篇

基于TRMM数据的鄱阳湖流域降雨时空分布特征及其精度评价

李相虎1,2, 张奇1, 邵敏1   

  1. 1. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京210008;
    2. 河海大学水文水资源与水利工程科学国家重点实验室, 南京210098
  • 收稿日期:2012-01-01 修回日期:2012-05-01 出版日期:2012-09-25 发布日期:2012-09-25
  • 作者简介:李相虎(1980-),男,博士,助研,主要从事水文过程模拟及其环境效应研究。E-mail:lxh8010@yahoo.com.cn
  • 基金资助:

    国家重点基础研究发展计划(973 计划)项目(2012CB417003);国家自然科学基金项目(41101024);水文水资源与水利工程科学国家重点实验室开放研究基金项目(2010490811)。

Spatio-temporal Distribution of Precipitation in Poyang Lake Basin Based on TRMM Data and Precision Evaluation

LI Xianghu1,2, ZHANG Qi1, SHAO Min1   

  1. 1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China;
    2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
  • Received:2012-01-01 Revised:2012-05-01 Online:2012-09-25 Published:2012-09-25

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摘要： 基于1998-2007 年热带测雨卫星(TRMM) 3B42 V6 降雨数据分析鄱阳湖流域降雨时空分布特征, 并利用40个气象站观测日降雨数据对TRMM数据在不同子流域、不同降雨强度及不同季节里的精度进行了对比分析, 弥补了以往只评价整体精度的不足。结果显示:鄱阳湖流域北部地区修水、饶河子流域较易出现暴雨, 导致雷达信号衰减, 使TRMM对大雨强降雨的探测出现较大偏差;流域内降雨以10~50 mm为主, 其雨量占到总雨量的60%;流域降雨在年内1-3 月中旬为干旱少雨期, 3 月下旬-9 月初为湿润多雨期, 9-12 月再次进入干旱少雨期;而空间分布呈东、西部大, 中部小的格局;同时发现, 在赣南山区TRMM降雨较观测雨量低300~400 mm, 这可能受高程和坡度的影响, 使TRMM对山区降雨的探测精度也出现较大偏差。

关键词: TRMM, 降雨, 精度评价, 鄱阳湖流域, 时空特征

Abstract: Based on the precipitation data of Poyang lake basin based on TRMM (tropical rainfall measuring mission) satellite 3B42 V6 during 1998-2007, this paper studies the spatio-temporal distribution of precipitation. And the precisions of TRMM data are evaluated for different sub-basins, rainfall intensities and seasons through the observation rainfall data obtained from 40 weather stations, which fills in a gap in the previous studies. The results show that the heavy rain events generally occur in the northern part of Poyang lake basin (Xiushui and Raohe sub-basins) based on TRMM and observation data, which can cause signal attenuation of radar and make a large error for TRMM. The class of 10~50 mm makes the greatest contribution to the total rainfall, accounting for about 60%. The temporal distribution of precipitation in the lake basin shows that there is a dry spell from January to mid-March and a wet spell from late March to September, and another dry spell is observed after September. The spatial distribution presents that more rainfall is observed in the eastern and western parts of the basin than in the central parts. It is also found that the rainfall is 300~400 mm less than observed data in the mountainous areas of southern Jiangxi province, which may be affected by elevation and gradient of landform. So, there is a limitation for TRMM to measure the heavy rain events and the rainfall in mountainous areas.

Key words: Poyang lake basin, precipitation, precision evaluation, spatio-temporal distribution, TRMM