globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015JD023239
论文题名:
Urban irrigation effects on WRF-UCM summertime forecast skill over the Los Angeles metropolitan area
作者: Vahmani P.; Hogue T.S.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2015
卷: 120, 期:19
起始页码: 9869
结束页码: 9881
语种: 英语
英文关键词: evapotranspiration ; irrigation ; Los Angeles ; UCM ; urban ; WRF
Scopus关键词: air temperature ; anthropogenic effect ; climate feedback ; cooling ; evapotranspiration ; hydrological cycle ; irrigation system ; latent heat flux ; metropolitan area ; performance assessment ; pixel ; semiarid region ; summer ; weather forecasting ; California ; Los Angeles [California] ; United States
英文摘要: In the current study, we explicitly address the impacts of urban irrigation on the local hydrological cycle by integrating a previously developed irrigation scheme within the coupled framework of the Weather Research and Forecasting-Urban Canopy Models (WRF-UCM) over the semiarid Los Angeles metropolitan area. We focus on the impacts of irrigation on the urban water cycle and atmospheric feedback. Our results demonstrate a significant sensitivity of WRF-UCM simulated surface turbulent fluxes to the incorporation of urban irrigation. Introducing anthropogenic moisture, vegetated pixels show a shift in the energy partitioning toward elevated latent heat fluxes. The cooling effects of irrigation on daily peak air temperatures are evident over all three urban types, with the largest influence over low-intensity residential areas (average cooling of 1.64'C). The evaluation of model performance via comparison against CIMIS (California Irrigation Management Information System) evapotranspiration (ET) estimates indicates that WRF-UCM, after adding irrigation, performs reasonably during the course of the month of July, tracking day-to-day variability of ET with notable consistency. In the nonirrigated case, CIMIS-based ET fluctuations are significantly underestimated by the model. Our analysis shows the importance of accurate representation of urban irrigation in modeling studies, especially over water-scarce regions such as the Los Angeles metropolitan area. We also illustrate that the impacts of irrigation on simulated energy and water cycles are more critical for longer-term simulations due to the interactions between irrigation and soil moisture fluctuations. ©2015. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62992
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: Civil and Environmental Engineering, University of Southern California, Los Angeles, CA, United States; Civil and Environmental Engineering, Colorado School of Mines, Golden, CO, United States; Hydrologic Science and Engineering Program, Colorado School of Mines, Golden, CO, United States

Recommended Citation:
Vahmani P.,Hogue T.S.. Urban irrigation effects on WRF-UCM summertime forecast skill over the Los Angeles metropolitan area[J]. Journal of Geophysical Research: Atmospheres,2015-01-01,120(19)
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