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A process-based evaluation of dust-emitting winds in the CMIP5 simulation of HadGEM2-ES

Fiedler, S.; Knippertz, P.; Woodward, S.; Martin, G.M.; Bellouin, N.; Ross, A.N.; Heinold, B.; Schepanski, K.; Birch, C.E.; Tegen, I.

Abstract:
Despite the importance of dust aerosol in the Earth system, state-of-the-art models show a large variety for North African dust emission. This study presents a systematic evaluation of dust emitting-winds in 30 years of the historical model simulation with the UK Met Office Earth-system model HadGEM2-ES for the Coupled Model Intercomparison Project Phase 5. Isolating the effect of winds on dust emission and using an automated detection for nocturnal low-level jets (NLLJs) allow an in-depth evaluation of the model performance for dust emission from a meteorological perspective. The findings highlight that NLLJs are a key driver for dust emission in HadGEM2-ES in terms of occurrence frequency and strength. The annually and spatially averaged occurrence frequency of NLLJs is similar in HadGEM2-ES and ERA-Interim from the European Centre for Medium-Range Weather Forecasts. Compared to ERA-Interim, a stronger pressure ridge over northern Africa in winter and the southward displaced heat low in summer result in differences in location and strength of NLLJs. Particularly the larger geostrophic winds associated with the stronger ridge have ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1007/s00382-015-2635-9
ISSN: 0930-7575
URN: urn:nbn:de:swb:90-532446
KITopen ID: 1000053244
HGF-Programm 12.01.02; LK 01
Erschienen in Climate Dynamics
Band 46
Heft 3-4
Seiten 1107-1130
Schlagworte Dust emission, Nocturnal low-level jet, Geostrophic wind, Earth system model, Climatology, North Africa
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