干旱区生态环境知识资源中心(Arid): 利用GRACE-FO重力卫星探测2019年长江中下游极端干旱

Arid

	利用GRACE-FO重力卫星探测2019年长江中下游极端干旱
其他题名	Monitoring the extreme drought in the middle and lower reaches of the Yangtze River in 2019 from GRACE-FO satellites
	冉艳红; 钟敏; 陈威; 钟玉龙; 冯伟
来源期刊	科学通报
ISSN	0023-074X
出版年	2021
卷号	66 期号:1 页码:107-117
中文摘要	2019年夏秋季长江中下游地区持续半年的极端干旱给当地的农业生产和生态环境带来了严重的影响.目前对于干旱程度的估计主要依赖于降水、蒸散发、径流和土壤含水量等参数的监测. GRACE/GRACE-FO重力卫星通过探测全球地球重力场变化,捕捉地表水、土壤水分和地下水储量变化信息,从而跟踪全球范围的干旱事件.虽然利用G RACE和GRACE-FO卫星观测全球和区域陆地水储量变化取得了重大成就,但利用重力卫星监测干旱程度的研究依然较少.因此基于GRACE/GRAC E-FO卫星观测资料,通过估计GRACE-DSI,研究分析了2019年夏秋季长江中下游地区的干旱强度及其时空分布.结果表明: (1) GRACE-DSI很好地反映了2019年夏秋季长江中下游地区持续干旱的发生、发展过程,其中极端干旱区域位于湖北东部、江西北部、安徽南部等区域; (2)湖北、江西、安徽和湖南四省区域平均的GRACE-DSI指数与6个月时间尺度的SPEI-Z的时间序列吻合最好,相关性为0.84,说明GRAC E-DSI能够反映干旱的长期积累效应; (3)通过比较长江中下游区域2011年春夏和2019年夏秋两次极端干旱事件的监测,显示GRACE-FO与GRACE前后两组重力卫星具有等同的干旱监测能力.今后随着重力卫星观测的空间分辨率和时间分辨率的不断提高, GRACE-DSI将能够更为准确、快速地探测水文极端干旱事件.
英文摘要	In the summer and autumn of 2019, an extreme drought lasting 0.5 year in the middle and lower reaches of the Yangtze River had a major impact on local agricultural production and the ecological environment. Traditionally, drought severity assessment relies on drought-related parameters observed by in situ measurements, such as precipitation, evapotranspiration, runoff, and soil moisture. In the past two decades, GRACE/GRACE-FO gravity satellite data have been widely used to estimate global and regional terrestrial water storage anomalies (TWSA), but there are still limited studies on the quantitative assessment of the severity of drought using GRACE/GRACE-FO data. The objective of this study was to analyse the drought severity in the middle and lower reaches of the Yangtze River in the summer and autumn of 2019 using GRACE/GRACE-FO data and to compare our estimates with the traditional drought index. The GRACE-based drought severity index (GRACE-DSI) is a monthly global drought severity index based on the TWSA from the GRACE/GRACE-FO (GRACE-TWSA). In this study, we used spherical harmonic (SH) products from the GRACE/GRACE-FO to obtain the TWSA. GRACE data processing includes replacing the degree-1 and C20, removing the 2004-2009 mean SH, filtering to reduce correlated errors, Gaussian smoothing, calculating the equivalent water layer thickness on 1° * 1° grids, and correcting leakage errors with scale factors. We then calculated the GRACE-DSI based on the GRACE-TWSA with the trend and seasonal cycles removed. To ensure consistency, we processed the standardised precipitation evapotranspiration index (SPEI) similar to the GRACE data and standardised the new SPEI as the SPEI-Z. Our results indicated that the GRACE-DSI can successfully monitor the occurrence and development of drought in the middle and lower reaches of the Yangtze River in spatiotemporal domains. The GRACE/GRACE-FO successfully detected the extreme drought event that occurred in the east of Hubei, north of Jiangxi, and south of Anhui during the summer and autumn of 2019. In July, the arid region was located in the north of the Yangtze River basin, including Henan and Shandong provinces. In August, the drought intensified and moved south to the middle and lower reaches of the Yangtze River, reaching a maximum in September, especially in Hubei, Jiangxi, and Anhui provinces. The drought was weakened in October, but intensified again in November and December and expanded through the middle and lower reaches of the Yangtze River to the coastal regions, such as Fujian and Guangzhou provinces. The mean time series of the GRACE-DSI over Hubei, Jiangxi, Anhui, and Hunan provinces showed good agreement with the SPEI-Z in both amplitude and phase on the six month time scale (SPEI06-Z) with a correlation coefficient of 0.84. The time series of the GRACE-DSI and SPEI06-Z both clearly showed the extreme drought events that occurred in Hubei, Jiangxi, Anhui, and Hunan provinces during the spring and summer of 2011 and the summer and autumn of 2019. Our results also indicate that the GRACE-FO has the same drought monitoring capability as the GRACE.
中文关键词	GRACE-FO重力卫星 ; 干旱指数 ; 长江中下游
英文关键词	GRACE-DSI GRACE-FO GRACE-DSI drought index the middle and lower reaches of the Yangtze River
类型	Article
语种	中文
开放获取类型	Bronze
收录类别	CSCD
WOS类目	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6916672
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/354353
作者单位	冉艳红, 中国科学院精密测量科学与技术创新研究院;;中国科学院大学地球与行星科学学院, 大地测量与地球动力学国家重点实验室;;, 武汉;;, ;;北京 430077;;100049. 钟敏, 中国科学院精密测量科学与技术创新研究院;;中国科学院大学地球与行星科学学院, 大地测量与地球动力学国家重点实验室;;, 武汉;;, ;;北京 430077;;100049. 陈威, 中国科学院精密测量科学与技术创新研究院;;中国科学院大学地球与行星科学学院;;School of Earth Sciences, the Ohio State University, 大地测量与地球动力学国家重点实验室;;;;, 武汉;;;;Columbus, ;;北京;;USA 430077;;100049;;43210. 钟玉龙, 中国地质大学(武汉)地理与信息工程学院, 武汉, 湖北 430074, 中国. 冯伟, 中国科学院精密测量科学与技术创新研究院, 大地测量与地球动力学国家重点实验室, 武汉, 湖北 430077, 中国.
推荐引用方式 GB/T 7714	冉艳红,钟敏,陈威,等. 利用GRACE-FO重力卫星探测2019年长江中下游极端干旱[J],2021,66(1):107-117.
APA	冉艳红,钟敏,陈威,钟玉龙,&冯伟.(2021).利用GRACE-FO重力卫星探测2019年长江中下游极端干旱.科学通报,66(1),107-117.
MLA	冉艳红,et al."利用GRACE-FO重力卫星探测2019年长江中下游极端干旱".科学通报 66.1(2021):107-117.