干旱区生态环境知识资源中心(Arid): Regional climate effects of irrigation and urbanization in thewestern united states: a model intercomparison

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DOI	10.2172/893610
报告编号	LBNL--60284; CEC-500-2006-031
来源ID	OSTI_ID: 893610
	Regional climate effects of irrigation and urbanization in thewestern united states: a model intercomparison
	Snyder, M.A.; Kueppers, L.M.; Sloan, L.C.; Cavan, D.C.; Jin, J.; Kanamaru, H.; Miller, N.L.; Tyree, M.; Du, H.; Weare, B.
英文摘要	In the western United States, more than 30,500 square miles has been converted to irrigated agriculture and urban areas. This study compares the climate responses of four regional climate models (RCMs) to these past land-use changes. The RCMs used two contrasting land cover distributions: potential natural vegetation, and modern land cover that includes agriculture and urban areas. Three of the RCMs represented irrigation by supplementing soil moisture, producing large decreases in August mean (-2.5 F to -5.6 F) and maximum (-5.2 F to -10.1 F) 2-meter temperatures where natural vegetation was converted to irrigated agriculture. Conversion to irrigated agriculture also resulted in large increases in relative humidity (9 percent 36 percent absolute change). Only one of the RCMs produced increases in summer minimum temperature. Converting natural vegetation to urban land cover produced modest but discernable climate effects in all models, with the magnitude of the effects dependent upon the preexisting vegetation type. Overall, the RCM results indicate that land use change impacts are most pronounced during the summer months, when surface heating is strongest and differences in surface moisture between irrigated land and natural vegetation are largest. The irrigation effect on summer maximum temperatures is comparable in magnitude (but opposite in sign) to predicted future temperature change due to increasing greenhouse gas concentrations.
出版年	2006
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	54 ENVIRONMENTAL SCIENCES ; AGRICULTURE ; CLIMATE MODELS ; CLIMATES ; GREENHOUSE GASES ; HEATING ; HUMIDITY ; IRRIGATION ; LAND USE ; MOISTURE ; PLANTS ; SOILS ; URBAN AREAS
URL	http://www.osti.gov/scitech/servlets/purl/893610
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/269179
推荐引用方式 GB/T 7714	Snyder, M.A.,Kueppers, L.M.,Sloan, L.C.,et al. Regional climate effects of irrigation and urbanization in thewestern united states: a model intercomparison,2006.