DOI: 10.1007/s00382-013-1794-9
Scopus记录号: 2-s2.0-84885935998
论文题名: Soil moisture-temperature feedbacks at meso-scale during summer heat waves over Western Europe
作者: Stéfanon M. ; Drobinski P. ; D'Andrea F. ; Lebeaupin-Brossier C. ; Bastin S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-05-06 起始页码: 1309
结束页码: 1324
语种: 英语
英文关键词: Droughts
; Heatwaves
; Hydrological cycle
; HyMeX
; MED-CORDEX
; Mediterranean climate
; Meso-scale circulations
英文摘要: This paper investigates the impact of soil moisture-temperature feedback during heatwaves occurring over France between 1989 and 2008. Two simulations of the weather research and forecasting regional model have been analysed, with two different land-surface models. One resolves the hydrology and is able to simulate summer dryness, while the other prescribes constant and high soil moisture and hence no soil moisture deficit. The sensitivity analysis conducted for all heatwave episodes highlights different soil moisture-temperature responses (1) over low-elevation plains, (2) over mountains and (3) over coastal regions. In the plains, soil moisture deficit induces less evapotranspiration and higher sensible heat flux. This has the effect of heating the planetary boundary layer and at the same time of creating a general condition of higher convective instability and a slight increase of shallow cloud cover. A positive feedback is created which increases the temperature anomaly during the heatwaves. In mountainous regions, enhanced heat fluxes over dry soil reinforce upslope winds producing strong vertical motion over the mountain slope, first triggered by thermal convection. This, jointly to the instability conditions, favors convection triggering and produces clouds and precipitation over the mountains, reducing the temperature anomaly. In coastal regions, dry soil enhances land/sea thermal contrast, strengthening sea-breeze circulation and moist cold marine air advection. This damps the magnitude of the heatwave temperature anomaly in coastal areas, expecially near the Mediterranean coast. Hence, along with heating in the plains, soil dryness can also have a significant cooling effect over mountains and coastal regions due to meso-scale circulations. © 2013 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54251
Appears in Collections: 过去全球变化的重建
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作者单位: Institut Pierre Simon Laplace, Laboratoire de Météorologie Dynamique, CNRS/Ecole Polytechnique/ENS/UPMC, Palaiseau, France; CNRM-GAME, Météo-France and CNRS, Toulouse, France; Institut Pierre Simon Laplace, Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, Guyancourt, France
Recommended Citation:
Stéfanon M.,Drobinski P.,D'Andrea F.,et al. Soil moisture-temperature feedbacks at meso-scale during summer heat waves over Western Europe[J]. Climate Dynamics,2014-01-01,42(2017-05-06)