DOI: 10.1007/s11069-020-03965-2
论文题名: Evaluation of two satellite-based products against ground-based observation for drought analysis in the southern part of Iran
作者: Jafari S.M. ; Nikoo M.R. ; Dehghani M. ; Alijanian M.
刊名: Natural Hazards
ISSN: 0921030X
出版年: 2020
卷: 102, 期: 3 起始页码: 1249
结束页码: 1267
语种: 英语
中文关键词: Downscaling
; Drought
; GLDAS-2
; Iran
; MERRA-Land
; Satellite-based product
英文关键词: data assimilation
; downscaling
; drought
; early warning system
; efficiency measurement
; extreme event
; ground-based measurement
; raingauge
; reliability analysis
; satellite data
; water management
; water stress
; Iran
英文摘要: Water stress or more specifically drought assessment plays a key role in water management, especially in extreme climate conditions. Basically, globally gridded satellite-based precipitation products are potential sources of data as alternatives for ground-based measurements. However, for a reliable application, they should be evaluated in different regions. In this paper, two satellite-based rainfall products, namely Modern-Era Retrospective Analysis for Research and Applications (MERRA)-Land and Global Land Data Assimilation System-2 (GLDAS-2), have been evaluated against ground-based observations in terms of precipitation and their application for drought analysis. At first, the coarse-resolution MERRA-Land is downscaled to the finer resolution of interest for better comparison. After comparison of these datasets against ground-based observations in terms of precipitation, it is concluded that MERRA-Land can better estimate precipitation. Then, the nonparametric SPIs at various timescales are derived to analyze how well MERRA-Land performs in drought monitoring. Different categorical and statistical error indices are used to assess the efficiency of MERRA-Land in capturing drought events. The results revealed that the downscaled MERRA-Land data can properly detect short-term and mid-term drought events known as agricultural and meteorological droughts throughout the study area, respectively. In addition, drought maps show that the majority of lands experience mid-term scale drought which are in agreement with ground-based observations. The methodology adopted in this study can be applied in areas lacking in rain-gauge stations which significantly extend current capabilities for drought monitoring and early warning systems. © 2020, Springer Nature B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/168543
Appears in Collections: 气候变化与战略
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作者单位: Department of Natural Resources and Environmental Studies, University of Northern British ColumbiaBC, Canada; School of Engineering, Department of Civil and Environmental Engineering, Shiraz University, Shiraz, Iran; Department of Civil Engineering and Transportation, University of Isfahan, Isfahan, Iran
Recommended Citation:
Jafari S.M.,Nikoo M.R.,Dehghani M.,et al. Evaluation of two satellite-based products against ground-based observation for drought analysis in the southern part of Iran[J]. Natural Hazards,2020-01-01,102(3)