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Title : An analysis of aeolian dust in climate models
Name of the speaker : Amato Evan
Affiliation : University of California, San Diego - USA
Laboratory organizer : Labex IPSL
Date and time : 11-07-2014 11h00
Location : UPMC - LATMOS - Salle de réunion - Tour 45-46, 4e étage
Summary :

This seminar is organised in the frame of Labex L-IPSL.

Aeolian dust is a key aspect of the climate system. Dust can modify the Earth’s energy budget, provide long-range transport of nutrients, and influence land surface processes via erosion. Consequently, effective modeling of the climate system, particularly at regional scales, requires a reasonably accurate representation of dust emission, transport, and deposition. Here I evaluate African dust in 23 state-of-the-art global climate models used in the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. I find that all models fail to reproduce basic aspects of dust emission and transport over the second half of the 20th century. The models systematically underestimate dust emission, transport and optical depth, and year-to-year changes in these properties bear little resemblance to observations. These findings cast doubt on the ability of these models to simulate the regional climate and the response of African dust to future climate change.