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Soil moisture-temperature feedbacks at meso-scale during summer heat waves over Western Europe

Climate dynamics, 2014-03, Vol.42 (5-6), p.1309-1324 [Peer Reviewed Journal]

Springer-Verlag Berlin Heidelberg 2013 ;2015 INIST-CNRS ;COPYRIGHT 2014 Springer ;Springer-Verlag Berlin Heidelberg 2014 ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0930-7575 ;EISSN: 1432-0894 ;DOI: 10.1007/s00382-013-1794-9 ;CODEN: CLDYEM

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  • Title:
    Soil moisture-temperature feedbacks at meso-scale during summer heat waves over Western Europe
  • Author: Stéfanon, Marc ; Drobinski, Philippe ; D’Andrea, Fabio ; Lebeaupin-Brossier, Cindy ; Bastin, Sophie
  • Subjects: Atmospheric circulation ; Climate science ; Climatology ; Climatology. Bioclimatology. Climate change ; Drought ; Earth and Environmental Science ; Earth Sciences ; Earth, ocean, space ; Environmental Sciences ; Exact sciences and technology ; External geophysics ; Geophysics/Geodesy ; Global Changes ; Hot weather ; Hydrologic cycle ; Meteorology ; Moisture content ; Oceanography ; Precipitation (Meteorology) ; Sciences of the Universe ; Soil mechanics ; Soil moisture
  • Is Part Of: Climate dynamics, 2014-03, Vol.42 (5-6), p.1309-1324
  • Description: 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.
  • Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
  • Language: English
  • Identifier: ISSN: 0930-7575
    EISSN: 1432-0894
    DOI: 10.1007/s00382-013-1794-9
    CODEN: CLDYEM
  • Source: Alma/SFX Local Collection
    ProQuest Central
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