[1]何坤龙,刘晓辉,刘 蛟*,等.不同偏差校正方法对青藏高原地区GPM的应用效果研究[J].山地学报,2021,(3):439-449.[doi:10.16089/j.cnki.1008-2786.000609]
　HE Kunlong,LIU Xiaohui,LIU Jiao*,et al.Performances of Different Deviation Calibration Methods on GPM in the Qinghai-Tibet Plateau, China[J].Mountain Research,2021,(3):439-449.[doi:10.16089/j.cnki.1008-2786.000609]
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不同偏差校正方法对青藏高原地区GPM的应用效果研究()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第3期
页码:
439-449
栏目:
山地技术
出版日期:
2021-05-25

文章信息/Info

Title:
Performances of Different Deviation Calibration Methods on GPM in the Qinghai-Tibet Plateau, China
文章编号:
1008-2786-(2021)3-439-11
作者:
何坤龙1;  刘晓辉1;  刘 蛟2; 3*;  张越关1
1.西华大学 能源与动力工程学院, 成都 610039; 2.西南科技大学 环境与资源学院,四川 绵阳621010; 3.国家遥感中心绵阳科技城分部,四川 绵阳621010
Author(s):
HE Kunlong1;  LIU Xiaohui1;  LIU Jiao2; 3*;  ZHANG Yueguan1
1. School of Energy and Power Engineering, Xihua University, Chengdu 610039, China; 2.School of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China; 3.Mianyang S&T City Division, National Remote Sensing Center of China, Mianyang 621010, Sichuan, China
关键词:
卫星遥感降水;  偏差校正;  GPM;  精度评估;  青藏高原
Keywords:
satellite remote sensing precipitation;  deviation correction;  GPM;  accuracy assessment;  the Qinghai-Tibet Plateau
分类号:
TP79
DOI:
10.16089/j.cnki.1008-2786.000609
文献标志码:
A
摘要:
新一代卫星降水产品GPM在全球降雨观测精度上较TRMM有大幅提升,但在青藏高原地区的精度仍然不理想,而目前遥感降水数据校正缺乏对数据中降水量、雨天频率以及概率分布多重属性的综合考虑。本文根据19个典型站点2014—2017年的日降水数据,在分析GPM降水探测精度的基础上,采用线性缩放法(LS)、局部强度缩放法(LOCI)、Gamma分布映射法以及Gamma和LOCI结合的方法(Gamma-LOCI)对青藏高原GPM数据进行了偏差校正。结果表明:(1)GPM对青藏高原日降水事件探测能力总体上表现出从年降水量较少的西北部洪积平原区以及中部腹地向年降水更丰富的东部山地区和平原区转好的趋势,从日降水强度来看,存在对小雨事件(<2 mm)高估和对大雨事件(>10 mm)低估的现象;(2)经四种方法校正后,GPM与站点观测数据在各百分位点上的整体偏差均有不同程度的降低,Gamma分布映射对降水时间序列的概率分布进行调整,修正了降水量并保留了极值,使其在降水偏丰区域的应用效果优于LS和LOCI; 和LOCI结合后同时对降水数据中雨量、雨天频率和时间概率分布校正,其应用效果进一步改善了GPM日降水过程的精度,提高了与站点日降水序列的拟合度和匹配度。研究结果为GPM在青藏高原地区的准确应用提供参考的校正方法,为区域水文模拟、水资源管理研究奠定基础条件。
Abstract:
Although a new generation of satellite precipitation product, Global Precipitation Measurement(GPM)can improve the accuracy of global precipitation observation data as compared with the previous Tropical Rainfall Measuring Mission(TRMM), its accuracy is still not high enough when applying it to the Qinghai-Tibet Plateau, China. Due to unique local climate and precipitous relief in the Qinghai-Tibet Plateau, precipitations collected at sparse rainfall gauges exhibited strong space-time heterogeneity, making some available approaches of precipitation calibration for GPM lacked of an integrated consideration of multiple attributes of rainfall volumes, rainfall frequency in rainy days and relevant probability distribution. In this study, GPM data for 2014-2017 was calibrated by observed precipitation collected at 19 meteorological stations in Tibet on a daily basis. Linear Scaling(LS), local Intensity(LOCI), Gamma Distribution Mapping(GDM)and GDM-LOCI methods were used to eliminate the deviation between GPM and the ground observations. The results show that:(1)Overall, the performance of GPM to detect daily precipitation over the Qinghai-Tibet Plateau described an increasing trend in space, rising gradually from low annual precipitation in the northwest pluvial plain and the central hinterland to rich annual precipitation in the eastern intermountainous plain. Unfortunately, light rain event(<2 mm)was overestimated but heavy rain event(>10 mm)was underestimated in terms of daily precipitation intensity.(2)After calibration by aforesaid four methods, the overall deviation between GPM and site observations were reduced to some extent at each percentile. The probability distribution of precipitation time series was optimized by GDM, and it calibrated precipitation values and retained extreme value by properly adjusting the probability distribution of GPM, making its application effect better than those of LS and LOCI in the area with more abundant precipitation. After combining with LOCI, GDM calibrated the precipitation, frequency of rainy day and time probability distribution of rainfall in GPM, and its application effect further improved the accuracy of GPM, and improved the fitting degree and matching degree to the daily precipitation series provided by ground stations. GDM-LOCI was the best suitable method to calibrate GPM after compared with any other single method. This research provides a reference calibration method for an accurate application of GPM in the Qinghai-Tibet Plateau, and lays a basic condition for regional hydrological simulation and water resources management research.

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备注/Memo

备注/Memo:
收稿日期(Received date):2020-12-08; 改回日期(Accepted date): 2021-05-28
基金项目(Foundation item):西华大学重点科研基金(Z17110); 西华大学研究生创新基金(ycjj2020109)。[Key Scientific Research Fund Of Xihua University(Z17110); Xihua University Graduate Student Innovation Fund(ycjj2020109)]
第一作者(Biography):何坤龙(1995-),男,四川巴中人,硕士研究生,主要研究方向:遥感水文水资源学。[HE Kunlong(1995-), male, born in Bazhong, Sichuan province, M.Sc. candidate, research on remote sensing hydrology and water resources] E-mail:m18833028159@163.com
*通讯作者(Corresponding author):刘蛟(1986-),男,博士,讲师,主要研究方向:遥感水文学。[LIU Jiao(1986-), male, Ph.D., lecturer, specialized in remote sensing hydrology] E-mail: liujiao1102@aliyun.com
更新日期/Last Update: 2021-05-30