测绘学报 ›› 2023, Vol. 52 ›› Issue (11): 1883-1891.doi: 10.11947/j.AGCS.2023.20220484

• 大地测量学与导航 • 上一篇    下一篇

GNSS/GRACE/GRACE-FO/气象数据结合反演干旱指数

姚朝龙1,2,3, 陈涌鑫1, 罗志才4, 李琼5, 叶雪淼1, 温进杰1   

  1. 1. 华南农业大学资源环境学院, 广东 广州 510642;
    2. 自然资源部建设用地再开发重点实验室, 广东 广州 510642;
    3. 广东省土地信息工程技术研究中心, 广东 广州 510642;
    4. 华中科技大学物理学院地球物理研究所, 湖北 武汉 430074;
    5. 西南石油大学土木工程与测绘学院, 成都 四川 610500
  • 收稿日期:2022-08-02 修回日期:2023-07-03 发布日期:2023-12-15
  • 作者简介:姚朝龙(1986-),男,博士,讲师,研究方向为GNSS、卫星重力数据处理及水文气象应用。E-mail:clyao@scau.edu.cn
  • 基金资助:
    国家自然科学基金(42004013);广东省自然科学基金面上项目(2022A1515010469);广州市科技计划项目基础研究计划-基础与应用基础研究项目(202102020526;202102020380)

A drought index derived from a combination of GNSS GRACE/GRACE-FO and meteorological data

YAO Chaolong1,2,3, CHEN Yongxin1, LUO Zhicai4, LI Qiong5, YE Xuemiao1, WEN Jinjie1   

  1. 1. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;
    2. Key Laboratory of the Ministry of Land and Resources for Construction Land Transformation, South China Agricultural University, Guangzhou 510642, China;
    3. Guangdong Province Land Information Engineering Technology Research Center, South China Agricultural University, Guangzhou 510642, China;
    4. MOE Key Laboratory of Fundamental Physical Quantities Measurement, Institute of Geophysics and PGMF, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
    5. School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
  • Received:2022-08-02 Revised:2023-07-03 Published:2023-12-15
  • Supported by:
    The National Natural Science Foundation of China (No. 42004013);Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515010469);Guangzhou Science and Technology Project (Nos. 202102020526;202102020380)

摘要: 构建融合多源数据的综合干旱指数对准确、客观、全面监测与评价干旱具有重要意义。本文利用主成分分析方法,将基于GNSS测站垂向形变和GRACE/GRACE Follow-On(GRACE-FO)重力卫星数据的单一水文干旱指数与我国常用的综合干旱指数(CI)进行融合,在西南地区构建反映水文气象要素的新型综合干旱指数(CDI)。结果表明,相比于CI和基于GNSS、GRACE/GRACE-FO数据的单一干旱指数,CDI指数与改进的帕默尔干旱指数(scPDSI)的相关性均有较大提升,最大相关系数达到0.84,相关系数提高的站点数占比分别达到100%、93%和67%,所有站点相关系数的平均值从0.48、0.34、0.57提高到0.64,表明本文构建的CDI指数能有效融合多源数据包含的干旱信息,提升区域干旱监测的效果。

关键词: GNSS, GRACE/GRACE Follow-On, 数据融合, 干旱指数, 主成分分析

Abstract: Developing the combined drought index (CDI) integrating multi-source data is of important significance for accurate, objective and comprehensive drought monitoring and assessment. In this study, we built a novel CDI reflecting hydro-meteorological variables in Southwest China based on the principle component analysis. The proposed CDI integrates drought indices derived from Global Navigation Satellite System (GNSS) vertical displacements and time-variable gravity fields from Gravity Recovery and Climate Experiment (GRACE)/GRACE Follow-On (GRACE-FO) as well as the commonly used meteorological composite index (CI) in China. The results show that compared to the individual CI index and the drought indices based on GNSS, GRACE/GRACE-FO data, correlation coefficients between the proposed CDI and self-calibrating palmer drought severity index (scPDSI) improved significantly, with the maximum value of 0.84; the number of sites with improved correlations for the individual drought indices account for 100%, 93%, and 67%, respectively;the averaged correlation coefficients of all studied sites increased from 0.48, 0.34, 0.57 to 0.64, respectively. The results indicate the effectiveness of integrating drought information containing in multi-source data in the proposed CDI index, which could help to improve regional drought monitoring.

Key words: GNSS, GRACE/GRACE Follow-On, data fusion, drought index, principle component analysis

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