Improving Princeton Forcing Dataset over Iran Using the Delta-Ratio Method

doi:10.3390/w12030630

	Improving Princeton Forcing Dataset over Iran Using the Delta-Ratio Method
	Zhang, Qinghuan 1; Tang, Qiuhong 1,3; Liu, Xingcai 1; Hosseini-Moghari, Seyed-Mohammad 1; Attarod, Pedram 2
刊名	WATER
	2020-03-01
卷号	12 期号:3 页码:15
关键词	Iran meteorological forcing data observed data precipitation wind speed
DOI	10.3390/w12030630
通讯作者	Tang, Qiuhong(tangqh@igsnrr.ac.cn)
英文摘要	In this study, we corrected the bias in the Princeton forcing dataset, i.e., precipitation, maximum and minimum temperatures, and wind speed, by adjusting its long-term mean monthly climatology to match observations for the period 1988-2012 using the delta-ratio method. To this end, we collected meteorological data from 97 stations covering the domain of Iran. We divided Iran into three climatic zones based on the De Martonne classification, i.e., Arid, Humid, and Per-Humid zones, and then applied the delta-ratio method for each climatic zone separately to adjust the bias. After adjustment, the new datasets were compared to the observations in 1958-1987. Results based on four skill scores, including the Nash Sutcliffe efficiency (NSE), percent bias (PBIAS), root-mean-square error (RMSE), and R-2, indicate that the adjustment greatly improved the quality of the gridded dataset, specifically, precipitation, maximum temperature, and wind speed. For example, NSE for annual precipitation during the validation time period increased from -0.03 to 0.72, PBIAS reduced from 29.2% to 6.6%, RMSE decreased by 182.44 mm, and R-2 increased from 0.06 to 0.75. Assessing the results in different climatic zones of Iran reveals that precipitation improved more significantly in the Per-Humid zone followed by the Humid zone, while maximum temperature improved better in the Arid areas. For wind speed, the values improved comparably in the three climate zones. However, the delta values for monthly minimum temperature calculated during the adjustment time period cannot be applied in the validation time period, due to the fact that the Princeton climate data cannot follow the behavior of minimum temperature during the validation phase. In short, we showed that a simple bias adjustment approach, along with minimum observed station data, can significantly improve the performance of global gridded datasets.
资助项目	National Natural Science Foundation of China[41790424] ; National Natural Science Foundation of China[41730645] ; National Natural Science Foundation of China[41425002] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20060402] ; CAS-VPST Silk Road Science Fund 2018[131A11KYSB20170113] ; Iran National Science Foundation (INSF)[96001633] ; Newton Advanced Fellowships
WOS关键词	REGIONAL CLIMATE MODEL ; PRECIPITATION ; BASIN ; PRODUCTS ; IMPACT
WOS研究方向	Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000529249500015
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; CAS-VPST Silk Road Science Fund 2018 ; Iran National Science Foundation (INSF) ; Newton Advanced Fellowships
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/159792]
专题	中国科学院地理科学与资源研究所
通讯作者	Tang, Qiuhong
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Univ Tehran, Coll Agr & Nat Resources, Fac Nat Resources, Forestry & Forest Econ Dept, Karaj 7787131587, Iran 3.Univ Chinese Acad Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qinghuan,Tang, Qiuhong,Liu, Xingcai,et al. Improving Princeton Forcing Dataset over Iran Using the Delta-Ratio Method[J]. WATER,2020,12(3):15.
APA	Zhang, Qinghuan,Tang, Qiuhong,Liu, Xingcai,Hosseini-Moghari, Seyed-Mohammad,&Attarod, Pedram.(2020).Improving Princeton Forcing Dataset over Iran Using the Delta-Ratio Method.WATER,12(3),15.
MLA	Zhang, Qinghuan,et al."Improving Princeton Forcing Dataset over Iran Using the Delta-Ratio Method".WATER 12.3(2020):15.