DOI: 10.1002/2017JD026740
论文题名: The influence of land cover on surface energy partitioning and evaporative fraction regimes in the U.S. Southern Great Plains
作者: Bagley J.E. ; Kueppers L.M. ; Billesbach D.P. ; Williams I.N. ; Biraud S.C. ; Torn M.S.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 11 起始页码: 5793
结束页码: 5807
语种: 英语
英文关键词: agricultural systems
; land-atmosphere interactions
; water-energy interactions
Scopus关键词: Triticum aestivum
英文摘要: Land-atmosphere interactions are important to climate prediction, but the underlying effects of surface forcing of the atmosphere are not well understood. In the U.S. Southern Great Plains, grassland/pasture and winter wheat are the dominant land covers but have distinct growing periods that may differently influence land-atmosphere coupling during spring and summer. Variables that influence surface flux partitioning can change seasonally, depending on the state of local vegetation. Here we use surface observations from multiple sites in the U.S. Department of Energy Atmospheric Radiation Measurement Southern Great Plains Climate Research Facility and statistical modeling at a paired grassland/agricultural site within this facility to quantify land cover influence on surface energy balance and variables controlling evaporative fraction (latent heat flux normalized by the sum of sensible and latent heat fluxes). We demonstrate that the radiative balance and evaporative fraction are closely related to green leaf area at both winter wheat and grassland/pasture sites and that the early summer harvest of winter wheat abruptly shifts the relationship between evaporative fraction and surface state variables. Prior to harvest, evaporative fraction of winter wheat is strongly influenced by leaf area and soil-atmosphere temperature differences. After harvest, variations in soil moisture have a stronger effect on evaporative fraction. This is in contrast with grassland/pasture sites, where variation in green leaf area has a large influence on evaporative fraction throughout spring and summer, and changes in soil-atmosphere temperature difference and soil moisture are of relatively minor importance. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62676
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: Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Energy and Resources Group, University of California, Berkeley, CA, United States; Department of Biological Sciences Engineering, University of Nebraska–Lincoln, Lincoln, NE, United States
Recommended Citation:
Bagley J.E.,Kueppers L.M.,Billesbach D.P.,et al. The influence of land cover on surface energy partitioning and evaporative fraction regimes in the U.S. Southern Great Plains[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(11)