气候变化领域集成服务门户(CCPortal): A framework for deriving drought indicators from the Gravity Recovery and Climate Experiment (GRACE)

CCPortal

DOI	10.5194/hess-24-227-2020
	A framework for deriving drought indicators from the Gravity Recovery and Climate Experiment (GRACE)
	Gerdener H.; Engels O.; Kusche J.
发表日期	2020
ISSN	1027-5606
起始页码	227
结束页码	248
卷号	24 期号:1
英文摘要	Identifying and quantifying drought in retrospective is a necessity for better understanding drought conditions and the propagation of drought through the hydrological cycle and eventually for developing forecast systems. Hydrological droughts refer to water deficits in surface and subsurface storage, and since these are difficult to monitor at larger scales, several studies have suggested exploiting total water storage data from the GRACE (Gravity Recovery and Climate Experiment) satellite gravity mission to analyze them. This has led to the development of GRACE-based drought indicators. However, it is unclear how the ubiquitous presence of climate-related or anthropogenic water storage trends found within GRACE analyses masks drought signals. Thus, this study aims to better understand how drought signals propagate through GRACE drought indicators in the presence of linear trends, constant accelerations, and GRACE-specific spatial noise. Synthetic data are constructed and existing indicators are modified to possibly improve drought detection. Our results indicate that while the choice of the indicator should be application-dependent, large differences in robustness can be observed. We found a modified, temporally accumulated version of the Zhao et al. (2017) indicator particularly robust under realistic simulations. We show that linear trends and constant accelerations seen in GRACE data tend to mask drought signals in indicators and that different spatial averaging methods required to suppress the spatially correlated GRACE noise affect the outcome. Finally, we identify and analyze two droughts in South Africa using real GRACE data and the modified indicators. © 2020 Author(s).
语种	英语
scopus关键词	Digital storage; Geodetic satellites; Constant acceleration; Drought conditions; Drought detection; Gravity recovery and climate experiments; Hydrological cycles; Hydrological droughts; Realistic simulation; Satellite gravity missions; Drought; anthropogenic effect; environmental indicator; GRACE; hydrological cycle; noise; satellite data; satellite mission; spatial analysis; water storage; South Africa
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159524
作者单位	Gerdener, H., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, Germany; Engels, O., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, Germany; Kusche, J., Institute of Geodesy and Geoinformation, University of Bonn, Bonn, Germany
推荐引用方式 GB/T 7714	Gerdener H.,Engels O.,Kusche J.. A framework for deriving drought indicators from the Gravity Recovery and Climate Experiment (GRACE)[J],2020,24(1).
APA	Gerdener H.,Engels O.,&Kusche J..(2020).A framework for deriving drought indicators from the Gravity Recovery and Climate Experiment (GRACE).Hydrology and Earth System Sciences,24(1).
MLA	Gerdener H.,et al."A framework for deriving drought indicators from the Gravity Recovery and Climate Experiment (GRACE)".Hydrology and Earth System Sciences 24.1(2020).