DOI: 10.1002/jgrd.50393
论文题名: Changes in reference evapotranspiration across the Tibetan Plateau: Observations and future projections based on statistical downscaling
作者: Wang W. ; Xing W. ; Shao Q. ; Yu Z. ; Peng S. ; Yang T. ; Yong B. ; Taylor J. ; Singh V.P.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4049
结束页码: 4068
语种: 英语
英文关键词: changes
; reference evapotranspiration
; statistical downscaling
; Tibetan Plateau
Scopus关键词: Climate change
; Climate models
; Geographic information systems
; Meteorology
; Water supply
; Actual evapotranspiration
; changes
; Historical observation
; Reference evapotranspiration
; Statistical downscaling
; Tibetan Plateau
; Vapor pressure deficit
; Water resources systems
; Evapotranspiration
; air temperature
; climate modeling
; data assimilation
; downscaling
; evapotranspiration
; global climate
; information system
; vapor pressure
; China
; Qinghai-Xizang Plateau
英文摘要: Long-term changes in historical observations and future projections of reference evapotranspiration (ET0 ) are of great importance in assessing the potential impacts of climate change on the hydrologic regime as well as water resources systems. In this study, with the aid of nonparametric trend analysis and geographic information system methods, spatial and seasonal patterns of changes in ET0 across the Tibetan Plateau (TP) were investigated using meteorological data of 81 stations for the period of 1961-2010. Almost half of all stations in the plateau, most of which were distributed in the north plateau, and the southwest and southeast corners, were characterized by decreasing trends in ET0 during 1961-2010 at both annual and seasonal scales. The temporal regional average series presented a zigzag increasing-decreasing-increasing pattern with two joint points in 1973 and 1993. The increasing vapor pressure deficit and air temperature dominated the increase in ET0 in the past two decades. The intrinsic mechanism term of hydrological feedback was attempted to be explored by examining the applicability of the Bouchet's hypothesis and Budyko-type expressions in the TP. Complementary effect existed between potential evaporation and actual evapotranspiration, deviating from theoretic relationship of Bouchet's hypothesis. Water-limited and energy-limited evaporation patterns at mean annual scale can be described well by Budyko-type expressions in the TP, especially Zhang's curve. Changing characteristics of the projected ET0 on the plateau during 2011-2100 from the HadCM3 (Hadley Centre Coupled Model version 3) under A2 and B2 emission scenarios and CGCM3 (the third generation couple global climate model) under A2 and A1B emission scenarios were projected based on a statistical downscaling method (SDSM). The SDSM performed fairly well in reproducing ET0 . The continuous increase in ET0 in the 21st century was revealed by both climate models. Concurrently, a larger increasing magnitude in ET0 was generally projected by HadCM3 compared with that by CGCM3. Spatially, projected annual ET0 changes under the different scenarios are similar with the increments in the north and southeast corners of the plateau and low increments over the southwest, northwest, and middle of the plateau. The results can provide beneficial reference to agriculture, water resource, and eco-environment management strategies in the plateau region for associated policymakers and stakeholders. Key PointsReveal reversal phenomenon of ET0 since 1994 and its dominated factorInvestigate the adaptability of SDSM for downscaling ET 0 on the TPDiscuss the future change patterns of ET0 based on the projection results ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63774
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China; College of Water Resources and Hydrology, Hohai University, Nanjing, China; CSIRO Mathematics, Informatics and Statistics, Wembley, Australia; Department of Geoscience, University of Nevada, Las Vegas NV, United States; CSIRO Mathematics, Informatics and Statistics, Canberra, Australia; Department of Biological and Agricultural Engineering, Texas A and M University, TX, United States; Department of Civil and Environmental Engineering, Texas A and M University, TX, United States
Recommended Citation:
Wang W.,Xing W.,Shao Q.,et al. Changes in reference evapotranspiration across the Tibetan Plateau: Observations and future projections based on statistical downscaling[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)