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CR 59:27-37 (2014)  -  DOI:

Role of soil moisture in the amplification of climate warming in the eastern Mediterranean and the Middle East

George Zittis1,*, Panos Hadjinicolaou1, Jos Lelieveld1,2

1Energy Environment and Water Research Center, The Cyprus Institute, 1645 Nicosia, Cyprus
2Department of Atmospheric Chemistry, Max Plank Institute for Chemistry, 55020 Mainz, Germany
*Corresponding author:

ABSTRACT: Projections for the 21st century suggest that climate change will be associated with changes in the frequency and intensity of weather and climate extremes (e.g. heat waves, droughts, heavy precipitation events). In the already warm summertime eastern Mediterranean and Middle East (ΕΜΜΕ) climate change may involve mechanisms and feedbacks that cause or intensify hot weather events. A potentially important feedback mechanism involves soil moisture-atmosphere interactions. When the soil water content and evapotranspiration are decreased, near-surface air temperatures are enhanced due to reduced evaporative cooling. Here we show the importance of this mechanism, especially in the northern part of the EMME, using the output of a regional climate model (HadRM3P). We applied the classical hydrology framework to define evapotranspiration regimes as a function of soil moisture and latent heat fluxes. Further, we used the correlation of summer maximum temperature and evapotranspiration as a diagnostic of this coupling, and we performed a composite analysis of maximum temperature for the dry and wet years of our dataset. Since temperature and precipitation regimes are expected to change in the EMME, we considered alterations of the relationship between soil moisture and the maximum temperature throughout the 21st century.

KEY WORDS: Land-atmosphere interactions · Soil moisture · Summer temperature · HadRM3P · Regional climate model · Eastern Mediterranean-Middle East

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Cite this article as: Zittis G, Hadjinicolaou P, Lelieveld J (2014) Role of soil moisture in the amplification of climate warming in the eastern Mediterranean and the Middle East. Clim Res 59:27-37.

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