Arid
DOI10.1016/j.agrformet.2011.07.005
Coupled land-atmosphere modeling of the effects of shrub encroachment on nighttime temperatures
He, Yufei1; De Wekker, Stephan F. J.1; Fuentes, Jose D.2; D’Odorico, Paolo1
通讯作者He, Yufei
来源期刊AGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
出版年2011
卷号151期号:12页码:1690-1697
英文摘要

Changes in vegetation cover affect the interactions between the land surface and the overlying atmosphere with important impacts on surface energy balance and microclimate conditions. A major ongoing change in vegetation cover has been observed in dryland regions around the world, where desert shrubs are encroaching into arid grasslands. However, the impact of shrub encroachment on local climate has not been investigated. We used a mesoscale model coupled with a Land Surface Model to simulate the effects of shrub encroachment on nighttime temperatures. These effects can have an important effect on the establishment of shrubs and need to be represented well by land surface parameterization schemes that are also used in long-term climate simulations. Idealized 2-dimensional simulations were conducted with vegetation types corresponding to shrubland and grassland typical of the Northern Chihuahuan Desert. Simulated surface energy and radiation fluxes and near-ground air temperature were analyzed and compared with observations. Results show a good comparison between the simulations and observations as long as vegetation parameters are adjusted in the model to be in better agreement with the observed parameters. The sensitivity of the nighttime air temperatures to green vegetation fraction, albedo, emissivity and roughness length is investigated. The results indicate that the green vegetation fraction is the key factor that causes the higher nighttime temperature in shrubland than in adjacent grassland, mainly by its effects on soil surface insulation, soil thermal diffusivity, and therefore on ground heat fluxes. (C) 2011 Elsevier B.V. All rights reserved.


英文关键词Shrub encroachment Microclimate, Land-atmosphere interaction Green vegetation fraction
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000297277200018
WOS关键词SURFACE MODEL ; COVER DATA ; ETA-MODEL ; CLIMATE ; VEGETATION ; HYDROLOGY ; DESERTIFICATION ; IMPLEMENTATION ; EVAPORATION ; GRASSLANDS
WOS类目Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/166899
作者单位1.Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA;
2.Penn State Univ, Dept Meteorol, University Pk, PA 16902 USA
推荐引用方式
GB/T 7714
He, Yufei,De Wekker, Stephan F. J.,Fuentes, Jose D.,et al. Coupled land-atmosphere modeling of the effects of shrub encroachment on nighttime temperatures[J],2011,151(12):1690-1697.
APA He, Yufei,De Wekker, Stephan F. J.,Fuentes, Jose D.,&D’Odorico, Paolo.(2011).Coupled land-atmosphere modeling of the effects of shrub encroachment on nighttime temperatures.AGRICULTURAL AND FOREST METEOROLOGY,151(12),1690-1697.
MLA He, Yufei,et al."Coupled land-atmosphere modeling of the effects of shrub encroachment on nighttime temperatures".AGRICULTURAL AND FOREST METEOROLOGY 151.12(2011):1690-1697.
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