Drought Monitoring of Southwestern China Using Insufficient GRACE Data for the Long-Term Mean Reference Frame under Global Change

doi:10.1175/JCLI-D-17-0869.1

	Drought Monitoring of Southwestern China Using Insufficient GRACE Data for the Long-Term Mean Reference Frame under Global Change
	Zhao, Chuanpeng ; Huang, Yaohuan 1; Li, Zhonghua ; Chen, Mingxing
刊名	JOURNAL OF CLIMATE
	2018-09-01
卷号	31 期号:17 页码:6897-6911
关键词	Principal components analysis Regression analysis Statistics Time series Adaptive models
ISSN号	0894-8755
DOI	10.1175/JCLI-D-17-0869.1
通讯作者	Huang, Yaohuan(huangyh@igsnrr.ac.cn)
英文摘要	Global changes, such as human activities and climate change, increase the odds of worsening drought. The Gravity Recovery and Climate Experiment (GRACE) satellite provides an opportunity to monitor drought levels by the total amount of water, instead of using a small finite set of water cycle elements or indirect indicators. The potential gap lies in the insufficient size of the GRACE record. The database does not meet the requirements of a stationary annual cycle calculated over a relatively long period as recommended by the IPCC, and the disturbance from long-term global changes is often not considered. In this work, a GRACE-based modulated water deficit (GRACE-MWD) process for drought monitoring under the modulated annual cycle (MAC) reference frame in southwest China was proposed. GRACE-MWD achieved a higher ratio of agreement with the standardized precipitation evapotranspiration index at a time scale of 3 months (SPEI03): it ranged from 0.48 to 0.84, while the GRACE-based drought severity index (GRACE-DSI) ranged from 0.48 to 0.68. Compared with remote sensing datasets widely used in drought monitoring, GRACE-MWD data are less affected by seasonality from land-cover categories, which benefit from the MAC reference frame. The ratio-of-agreement metric for the study area showed that GRACE-MWD had a time scale between 7 and 11 months in reference to SPEI and the standardized precipitation index (SPI). The stability of the MAC reference frame to GRACE-MWD was further discussed when GRACE records were extended and was more stable than that of the stationary annual cycle. GRACE-MWD meets global changes via an adaptive reference frame, which is worthy of generalizing to global applications.
资助项目	National Key Research and Development Program of China[2017YFB0503005] ; National Key Research and Development Program of China[2016YFC0401404]
WOS关键词	EMPIRICAL MODE DECOMPOSITION ; REMOTE-SENSING DATA ; CLIMATE-CHANGE ; WATER-RESOURCES ; TIME-SERIES ; SATELLITE-OBSERVATIONS ; VEGETATION DYNAMICS ; UNITED-STATES ; ANNUAL CYCLE ; EVAPOTRANSPIRATION
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER METEOROLOGICAL SOC
WOS记录号	WOS:000439546100002
资助机构	National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/129985]
专题	中国科学院地理科学与资源研究所
通讯作者	Huang, Yaohuan
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Chuanpeng,Huang, Yaohuan,Li, Zhonghua,et al. Drought Monitoring of Southwestern China Using Insufficient GRACE Data for the Long-Term Mean Reference Frame under Global Change[J]. JOURNAL OF CLIMATE,2018,31(17):6897-6911.
APA	Zhao, Chuanpeng,Huang, Yaohuan,Li, Zhonghua,&Chen, Mingxing.(2018).Drought Monitoring of Southwestern China Using Insufficient GRACE Data for the Long-Term Mean Reference Frame under Global Change.JOURNAL OF CLIMATE,31(17),6897-6911.
MLA	Zhao, Chuanpeng,et al."Drought Monitoring of Southwestern China Using Insufficient GRACE Data for the Long-Term Mean Reference Frame under Global Change".JOURNAL OF CLIMATE 31.17(2018):6897-6911.