DOI: 10.1002/2016MS000656
Scopus记录号: 2-s2.0-84980316454
论文题名: Irrigation impacts on California's climate with the variable-resolution CESM
作者: Huang X ; , Ullrich P ; A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 3 起始页码: 1151
结束页码: 1163
语种: 英语
英文关键词: Agricultural products
; Agriculture
; Atmospheric temperature
; Climate models
; Earth (planet)
; Heat flux
; Soil moisture
; Agricultural water use
; Earth system model
; Frequency distributions
; High resolution simulations
; Near surface temperature
; Regional climate modeling
; Surface evaporation
; Variable resolution
; Irrigation
; climate conditions
; climate modeling
; environmental impact
; evaporation
; global climate
; humidity
; irrigation
; latent heat flux
; parameterization
; regional climate
; soil moisture
; spatiotemporal analysis
; temperature profile
; water use
; California
; Central Valley [California]
; United States
英文摘要: The variable-resolution capability within the Community Earth System Model (VR-CESM) is applied to understand the impact of irrigation on the regional climate of California. Irrigation is an important contributor to the regional climate of heavily irrigated regions, and within the U.S. there are few regions that are as heavily irrigated as California's Central Valley, responsible for 25% of domestic agricultural products. A flexible irrigation scheme with relatively realistic estimates of agricultural water use is employed. The impact of irrigation on mean climatology and heat extremes is investigated over the 26 year period 1980–2005 using a relatively fine grid resolution of 0.25˚ (∼28 km). Three simulations are performed, including an unirrigated control run and two irrigation-enabled runs, with results compared to gridded observations and weather station data sets. During the summer months (when irrigation peaks), irrigation leads to cooling of the daily maximum near-surface temperature field (Tmax) by approximately 1.1 K. Under irrigation, latent heat flux increased by ∼61% during the daytime as a result of increased surface evaporation; specific humidity increased by about 12%; heat stress was reduced by 22% and the average soil moisture exhibited a small (∼4.4%) but statistically significant increase. Compared with observations, irrigation improved the frequency distribution of Tmax, and both length and frequency of hot spells were better represented with irrigation enabled. Consequently, we argue that high-resolution simulations of regional climate in CESM, particularly over heavily irrigated regions, should likely enable the irrigation parameterization to better represent local temperature statistics. © 2016. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75881
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Land, Air and Water Resources, University of California, Davis, CA, United States
Recommended Citation:
Huang X,, Ullrich P,A. Irrigation impacts on California's climate with the variable-resolution CESM[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(3)