利用GPS垂向位移监测西南地区干旱事件

doi:10.11947/j.AGCS.2019.20180308

测绘学报 ›› 2019, Vol. 48 ›› Issue (5): 547-554.doi: 10.11947/j.AGCS.2019.20180308

利用GPS垂向位移监测西南地区干旱事件

姚朝龙¹, 罗志才², 胡月明^1,3,4,5, 王长委¹, 张瑞¹, 李金明¹

1. 华南农业大学资源环境学院, 广东广州 510642;
2. 华中科技大学物理学院地球物理研究所, 湖北武汉 430074;
3. 国土资源部建设用地再开发重点实验室, 广东广州 510642;
4. 广东省土地利用与整治重点实验室, 广东广州 510642;
5. 广东省土地信息工程技术研究中心, 广东广州 510642

收稿日期:2018-06-27 修回日期:2019-02-21 出版日期:2019-05-20 发布日期:2019-06-05
通讯作者: 胡月明 E-mail:ymhu163@163.com
作者简介:姚朝龙(1986-),男,博士,讲师,研究方向为时变重力场、GNSS理论及应用。E-mail:clyao@scau.edu.cn
基金资助:
国家自然科学基金（41604017）；武汉大学地球空间环境与大地测量教育部重点实验室开放基金资助项目（17-01-08）；华南农业大学资源环境学院院长基金（ZHXY2018A01）

Detecting droughts in Southwest China from GPS vertical position displacements

YAO Chaolong¹, LUO Zhicai², HU Yueming^1,3,4,5, WANG Changwei¹, ZHANG Rui¹, LI Jinming¹

1. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China;
2. MOE Key Laboratory of Fundamental Physical Quantities Measurement, Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
3. Key Laboratory of the Ministry of Land and Resources for Construction Land Transformation, South China Agricultural University, Guangzhou 510642, China;
4. Guangdong Provincial Key Laboratory of Land Use and Consolidation, South China Agricultural University, Guangzhou 510642, China;
5. Guangdong Province Land Information Engineering Technology Research Center, South China Agricultural University, Guangzhou 510642, China

Received:2018-06-27 Revised:2019-02-21 Online:2019-05-20 Published:2019-06-05
Supported by:
The National Natural Science Foundation of China (No. 41604017);The Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University (No. 17-01-08);The Dean's Fund of College of Natural Resources and Environment, South China Agricultural University (No. ZHXY2018A01)

摘要/Abstract

摘要： GPS垂向位移包含了陆地水储量变化引起的地球弹性形变信息。本文利用中国大陆构造环境监测网（陆态网）31个GPS台站2010年8月-2016年12月的垂向位移数据，分析我国西南地区的干旱事件。结果表明，GPS垂向位移的季节性变化与降雨、GRACE反演的水储量、河流水位变化具有较强的负相关关系，其异常变化（非季节性变化）与我国使用的综合气象干旱指数（CI）、GRACE干旱强度指数（GRACE-DSI）相关性较强（相关系数约为-0.70），而与标准化降水蒸散指数（SPEI）的相关性较弱。相比于CI干旱指数，GPS垂向位移能更好地探测短期降雨急剧减少引起的干旱事件。数据缺失影响了GRACE-DSI探测干旱的准确性，而SPEI的波动较大，且存在高估某些短期降雨严重性的情况。研究结果展示了GPS在干旱监测方面的可靠性和优势。

关键词: GPS垂向位移, 陆地水储量变化, GRACE, 干旱

Abstract: The solid Earth responds elastically to terrestrial water storage (TWS) changes. Here global positioning system(GPS)vertical position data at 31 stations from crustal movement observation network of China (CMONOC)from August 2010 to December 2016 are used to detect droughts in Southwest China. Monthly GPS vertical position displacements respond negatively to precipitation changes and TWS changes observed by gravity recovery and climate experiment(GRACE) as well as river water level variations. GPS vertical position anomalies (the nonseasonal term) are well correlated negatively (correlations of about -0.70) with the commonly used meteorological composite index (CI) in China and the GRACE drought severity index (GRACE-DSI), but less correlated with the standardized precipitation evapotranspiration index (SPEI). Compared to CI, GPS vertical position anomalies have the advantage in detecting droughts caused by abrupt precipitation deficits in a short time period. GRACE-DSI is less accurate in drought monitoring for some periods due to the missing data, while the severity of abrupt precipitation absent in some cases can be overestimated from SPEI with big variability. This study shows the reliability and advantages of GPS data in drought monitoring.

Key words: GPS vertical displacement, terrestrial water storage, GRACE, drought

中图分类号:

P227

姚朝龙, 罗志才, 胡月明, 王长委, 张瑞, 李金明. 利用GPS垂向位移监测西南地区干旱事件[J]. 测绘学报, 2019, 48(5): 547-554.

YAO Chaolong, LUO Zhicai, HU Yueming, WANG Changwei, ZHANG Rui, LI Jinming. Detecting droughts in Southwest China from GPS vertical position displacements[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(5): 547-554.

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利用GPS垂向位移监测西南地区干旱事件

Detecting droughts in Southwest China from GPS vertical position displacements

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