DOI: 10.1175/JCLI-D-16-0727.1
Scopus记录号: 2-s2.0-85028499579
论文题名: Quantifying spatiotemporal variations of soil moisture control on surface energy balance and near-surface air temperature
作者: Schwingshackl C. ; Hirschi M. ; Seneviratne S.I.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 18 起始页码: 7105
结束页码: 7124
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Climate models
; Earth (planet)
; Earth atmosphere
; Evapotranspiration
; Heat flux
; Moisture
; Moisture control
; Soil moisture
; Soils
; Atmosphere-land interactions
; Evaporative fraction
; Land-atmosphere couplings
; Near surface air temperature
; Spatial and temporal variation
; Spatio-temporal variation
; Surface temperatures
; Transitional regimes
; Soil surveys
英文摘要: Soil moisture plays a crucial role for the energy partitioning at Earth's surface. Changing fractions of latent and sensible heat fluxes caused by soil moisture variations can affect both near-surface air temperature and precipitation. In this study, a simple framework for the dependence of evaporative fraction (the ratio of latent heat flux over net radiation) on soil moisture is used to analyze spatial and temporal variations of land- atmosphere coupling and its effect on near-surface air temperature. Using three different data sources (two reanalysis datasets and one combination of different datasets), three key parameters for the relation between soil moisture and evaporative fraction are estimated: 1) the frequency of occurrence of different soil moisture regimes, 2) the sensitivity of evaporative fraction to soil moisture in the transitional soil moisture regime, and 3) the critical soil moisture value that separates soil moisture- and energy-limited evapotranspiration regimes. The results show that about 30%-60% (depending on the dataset) of the global land area is in the transitional regime during at least half of the year. Based on the identification of transitional regimes, the effect of changes in soil moisture on near-surface air temperature is analyzed. Typical soil moisture variations (standard deviation) can impact air temperature by up to 1.1-1.3 K, while changing soil moisture over its full range in the transitional regime can alter air temperature by up to 6-7 K. The results emphasize the role of soil moisture for atmosphere and climate and constitute a useful benchmark for the evaluation of the respective relationships in Earth system models. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48727
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: Institute for Atmospheric and Climate Science, ETH Zürich, Zurich, Switzerland
Recommended Citation:
Schwingshackl C.,Hirschi M.,Seneviratne S.I.. Quantifying spatiotemporal variations of soil moisture control on surface energy balance and near-surface air temperature[J]. Journal of Climate,2017-01-01,30(18)