DOI: 10.1002/2015GL066305
论文题名: Vegetation controls on surface heat flux partitioning, and land-atmosphere coupling
作者: Williams I.N. ; Torn M.S.
刊名: Geophysical Research Letters
ISSN: 0094-8524
EISSN: 1944-8255
出版年: 2015
卷: 42, 期: 21 起始页码: 9416
结束页码: 9424
语种: 英语
英文关键词: convective triggering
; evaporative fraction
; evapotranspiration
; land-atmosphere coupling
; phenology
; soil moisture
Scopus关键词: Biology
; Evapotranspiration
; Latent heat
; Moisture
; Soil moisture
; Soils
; Vegetation
; convective triggering
; Evaporative fraction
; Hydrological cycles
; Land-atmosphere couplings
; phenology
; Sensible and latent heat fluxes
; Southern great plains
; Vegetation phenology
; Heat flux
; atmosphere-biosphere interaction
; atmospheric convection
; atmospheric forcing
; correlation
; evapotranspiration
; flux measurement
; hydrological cycle
; latent heat flux
; leaf area index
; partitioning
; phenology
; sensible heat flux
; soil moisture
; vegetation cover
; Great Plains
英文摘要: We provide observational evidence that land-atmosphere coupling is underestimated by a conventional metric defined by the correlation between soil moisture and surface evaporative fraction (latent heat flux normalized by the sum of sensible and latent heat flux). Land-atmosphere coupling is 3 times stronger when using leaf area index as a correlate of evaporative fraction instead of soil moisture, in the Southern Great Plains. The role of vegetation was confirmed using adjacent flux measurement sites having identical atmospheric forcing but different vegetation phenology. Transpiration makes the relationship between evaporative fraction and soil moisture nonlinear and gives the appearance of weak coupling when using linear soil moisture metrics. Regions of substantial coupling extend to semiarid and humid continental climates across the United States, in terms of correlations between vegetation metrics and evaporative fraction. The hydrological cycle is more tightly constrained by the land surface than previously inferred from soil moisture. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954541808&doi=10.1002%2f2015GL066305&partnerID=40&md5=02b1881abee84aa77ce48f48b563cab7
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8140
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Climate Sciences Department, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Recommended Citation:
Williams I.N.,Torn M.S.. Vegetation controls on surface heat flux partitioning, and land-atmosphere coupling[J]. Geophysical Research Letters,2015-01-01,42(21).