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How well do analyses capture dust-generating winds in the Sahara and Sahel?

Roberts, A.; Marsham, J. H.; Knippertz, P.; Parker, D. J.

Abstract (englisch):
Airborne mineral dust is important for weather, climate and earth-system prediction. Uncertainty in winds, as well as the land-surface, are known to be key to model uncertainties for dust uplift. Recent research has shown that during the summer wet season in the Sahel strong winds generated by the cold outflow from organized convective systems are an important dust storm mechanism (so called haboobs), while over the inner Sahara nocturnal low-level jets forming on the pressure gradient around the heat low dominate. Together the Sahel and Sahara are the world's largest dust source. Until now there has been a severe shortage of data for evaluating models for this region. Here, we bring together new observations from the remote Sahara, made during the Fennec project, with Sahelian data from the African Monsoon Multidisciplinary Analysis (AMMA), to provide an unprecedented evaluation of dust-generating winds in the European Centre for Medium-Range Weather Forecasts ERA-Interim (ERA-I) reanalysis. Differences between observations and ERA-I are explored with specific attention to monsoon and non-monsoon influenced regions. The main result ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Vortrag
Jahr 2016
Sprache Englisch
Identifikator KITopen ID: 1000064988
HGF-Programm 12.01.02; LK 01
Erschienen in EGU General Assembly, 17–22 April 2016, Vienna, A
Bemerkung zur Veröffentlichung EGU2016-8072
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