DOI: 10.1029/2012JD018400
论文题名: Spatial-temporal variations of evapotranspiration and runoff/ precipitation ratios responding to the changing climate in the pacific northwest during 1921-2006
作者: Liu M. ; Adam J.C. ; Hamlet A.F.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 380
结束页码: 394
语种: 英语
Scopus关键词: Economics
; Evapotranspiration
; Meteorology
; Water supply
; Changing temperature
; Controlled simulation
; Eddy covariance measurements
; Hydrologic modeling
; Meteorological data
; Pacific decadal oscillation
; Precipitation ratios
; Variable infiltration capacities
; Climate change
; climate change
; eddy covariance
; evapotranspiration
; hydrological modeling
; numerical model
; Pacific Decadal Oscillation
; precipitation (climatology)
; runoff
; spatiotemporal analysis
; water resource
; Pacific Ocean
; Pacific Ocean (Northwest)
英文摘要: Water resources in the Pacific Northwest (PNW) are very sensitive to climate change. There are still big knowledge gaps on how evapotranspiration (ET) varies in responding to changing temperature (T) and precipitation (P) over different zones in terms of supply and demand regime for ET. Here, we employ the Variable Infiltration Capacity (VIC) hydrologic model and a high-resolution meteorological data set to quantify spatial and seasonal variations of ET and the runoff (R)/precipitation (P) ratio over the PNW and attribute effects of T and P. We evaluate modeled ET and R with eddy covariance measurements, upscaled regional ET, and reconstructed natural streamflow. Simulation results indicate that water-limited (annual potential ET (PET) ≥ P) and energy-limited zones (annual PET < P) have different responses to changing climate. In general, waterlimited zones tend to be more associated with increasing ET and decreasing R/P than do energy-limited regions. With controlled simulation experiments, we document that trends in annual and warm-season ET and R/P are dominantly controlled by P, while in the cool season they are mainly controlled by T. During an entire cycle of the Pacific Decadal Oscillation (1947-2006), the PNW experienced a substantial increase in ET and a decrease in R and R/P under the trends of warming and drying. In this snowmelt-dominated region where warming-induced changes to the snowpack are impacting seasonal freshwater availability, decreases in R/P could further aggravate water scarcity. To reduce uncertainties, high-resolution meteorological data sets and intensive model calibrations and evaluations against ET are required. © 2012. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64005
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: Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, United States
Recommended Citation:
Liu M.,Adam J.C.,Hamlet A.F.. Spatial-temporal variations of evapotranspiration and runoff/ precipitation ratios responding to the changing climate in the pacific northwest during 1921-2006[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)