DOI: 10.1007/s00382-016-3144-1
Scopus记录号: 2-s2.0-84965069029
论文题名: The impact of an extreme case of irrigation on the southeastern United States climate
作者: Selman C. ; Misra V.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-03-04 起始页码: 1309
结束页码: 1327
语种: 英语
英文关键词: Agriculture
; Anthropogenic
; Anthropogenic influences
; Climate
; Climate change
; Diurnal
; Diurnal climatology
; Impact
; Irrigation
; Model
; Parametrization
; Regional
; Regional climate modeling
; Regional model
; Southeast
; Southeast United States
; Southeast US
英文摘要: The impacts of irrigation on southeast United States diurnal climate are investigated using simulations from a regional climate model. An extreme case is assumed, wherein irrigation is set to 100 % of field capacity over the growing season of May through October. Irrigation is applied to the root zone layers of 10–40 and 40–100 cm soil layers only. It is found that in this regime there is a pronounced decrease in monthly averaged temperatures in irrigated regions across all months. In non-irrigated areas a slight warming is simulated. Diurnal maximum temperatures in irrigated areas warm, while diurnal minimum temperatures cool. The daytime warming is attributed to an increase in shortwave flux at the surface owing to diminished low cloud cover. Nighttime and daily mean cooling result as a consequence repartitioning of energy into latent heat flux over sensible heat flux, and of a higher net downward ground heat flux. Excess heat is transported into the deep soil layer, preventing a rapidly intensifying positive feedback loop. Both diurnal and monthly average precipitations are reduced over irrigated areas at a magnitude and spatial pattern similar to one another. Due to the excess moisture availability, evaporation is seen to increase, but this is nearly balanced by a corresponding reduction in sensible heat flux. Concomitant with additional moisture availability is an increase in both transient and stationary moisture flux convergences. However, despite the increase, there is a large-scale stabilization of the atmosphere stemming from a cooled surface. © 2016, Springer-Verlag Berlin Heidelberg. 资助项目: USGS, U.S. Geological Survey
; NOAA, National Oceanic and Atmospheric Administration
; NOAA, National Oceanic and Atmospheric Administration
; NOAA, National Oceanic and Atmospheric Administration
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53348
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Center for Ocean-Atmospheric Prediction Studies, Florida State University, Tallahassee, FL, United States; Florida Climate Institute, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Selman C.,Misra V.. The impact of an extreme case of irrigation on the southeastern United States climate[J]. Climate Dynamics,2017-01-01,48(2017-03-04)