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Long-range transport of Saharan dust and its radiative impact on precipitation forecast over western Europe: a case study during COPS

Chaboureau, Jean-Pierre und Richard, Evelyne und Pinty, Jean-Pierre und Flamant, Cyrille und Di Girolamo, Paolo und Kiemle, Christoph und Behrendt, Andreas und Chepfer, Hélène und Chiriaco, Marjolaine und Wulfmeyer, Volker (2011) Long-range transport of Saharan dust and its radiative impact on precipitation forecast over western Europe: a case study during COPS. Quarterly Journal of the Royal Meteorological Society, 137, Seiten 236-251. DOI: 10.1002/qj.719.

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A Saharan dust event affected the Rhine valley in southwestern Germany and eastern France on 1 August 2007 during the Convective and Orographically-induced Precipitation Study (COPS) experiment. Prior to an episode of intense convection, a layer of dry, clean air capped by a moist, dusty layer was observed using Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO), airborne and ground-based lidar observations from North Africa to western Europe. The origin of the different layers was investigated using the regional model Meso-NH. For the purpose of modeling evaluation, a lidar simulator was developed for directly comparing observed and simulated vertical structures of the lidar backscattered signal. Overall, the model reproduced the vertical structure of dust probed at several times by the different lidar systems during its long-range transport. From Lagrangian back trajectories it was found that the dust was mobilized from sources inMauritania six days earlier, while the dry layer subsided over the north Atlantic. Off the Moroccan coasts, the dry layer folded down beneath the dusty airmass and the two-layer structure was advected to the Rhine valley in about two days. By heating the atmosphere, the dust layer changed the static stability of the atmosphere and thus the occurrence of convection. A sensitivity study to the radiative effect of dust indeed shows a better prediction of precipitation when a dust prognostic scheme was used rather than climatology or when dust effects were ignored. This result suggests that dust episodes that occur prior to convective events might be important for quantitative precipitation forecasts.

Titel:Long-range transport of Saharan dust and its radiative impact on precipitation forecast over western Europe: a case study during COPS
AutorenInstitution oder E-Mail-Adresse der Autoren
Chaboureau, Jean-PierreCNRS, Paris, F
Richard, EvelyneCNRS, Paris, F
Pinty, Jean-PierreCNRS, Paris, F
Flamant, CyrilleCNRS, Paris, F
Di Girolamo, PaoloUniv. degli Studi della Basilicata, Potenza, I
Kiemle, ChristophDLR IPA
Behrendt, AndreasUniv. Hohenheim, Stuttgart
Chepfer, HélèneUniv. Pierre et Marie Curie, Paris, F
Chiriaco, MarjolaineCNRS, Paris, F
Wulfmeyer, VolkerUniv. Hohenheim, Stuttgart
Erschienen in:Quarterly Journal of the Royal Meteorological Society
Referierte Publikation:Ja
In Open Access:Nein
In ISI Web of Science:Ja
DOI :10.1002/qj.719
Seitenbereich:Seiten 236-251
Stichwörter:Saharan dust; convective precipitation; mesoscale modelling
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt, Luftfahrt
HGF - Programmthema:Erdbeobachtung, ATM und Flugbetrieb
DLR - Schwerpunkt:Raumfahrt, Luftfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung, L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung, L - Klima, Wetter und Umwelt
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Dr.rer.nat. Christoph Kiemle
Hinterlegt am:06 Dez 2010 14:45
Letzte Änderung:12 Dez 2013 21:06

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