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Atmospheric dust modeling from meso to global scales with the online NMMB/BSC-Dust model � Part 2: Experimental campaigns in Northern Africa

Haustein, K. und Perez, C. und Baldasano, J.M. und Jorba, O. und Basart, S. und Miller, R. L. und Janjic, Z. und Black, T. und Nickovic, S. und Todd, M.C. und Washington, R. und Müller, D. und Tesche, M. und Weinzierl, Bernadett und Esselborn, M. und Schladitz, A. (2012) Atmospheric dust modeling from meso to global scales with the online NMMB/BSC-Dust model âÂ�Â� Part 2: Experimental campaigns in Northern Africa. Atmospheric Chemistry and Physics, 12 (L03812), Seiten 2933-2958. DOI: 10.5194/acp-12-2933-2012.

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Offizielle URL: http://www.atmos-chem-phys.net/12/2933/2012/

Kurzfassung

The new NMMB/BSC-Dust model is intended to provide short to medium-range weather and dust forecasts from regional to global scales. It is an online model in which the dust aerosol dynamics and physics are solved at each model time step. The companion paper (P�©rez et al., 2011) develops the dust model parameterizations and provides daily to annual evaluations of the model for its global and regional configurations. Modeled aerosol optical depth (AOD) was evaluated against AERONET Sun photometers over Northern Africa, Middle East and Europe with correlations around 0.6â��0.7 on average without dust data assimilation. In this paper we analyze in detail the behavior of the model using data from the Saharan Mineral Dust experiment (SAMUM-1) in 2006 and the Bod�©l�© Dust Experiment (BoDEx) in 2005. AOD from satellites and Sun photometers, vertically resolved extinction coefficients from lidars and particle size distributions at the ground and in the troposphere are used, complemented by wind profile data and surface meteorological measurements. All simulations were performed at the regional scale for the Northern African domain at the expected operational horizontal resolution of 25 km. Model results for SAMUM-1 generally show good agreement with satellite data over the most active Saharan dust sources. The model reproduces the AOD from Sun photometers close to sources and after long-range transport, and the dust size spectra at different height levels. At this resolution, the model is not able to reproduce a large haboob that occurred during the campaign. Some deficiencies are found concerning the vertical dust distribution related to the representation of the mixing height in the atmospheric part of the model. For the BoDEx episode, we found the diurnal temperature cycle to be strongly dependant on the soil moisture, which is underestimated in the NCEP analysis used for model initialization. The low level jet (LLJ) and the dust AOD over the Bod�©l�© are well reproduced. The remaining negative AOD bias (due to underestimated surface wind speeds) can be substantially reduced by decreasing the threshold friction velocity in the model.

Dokumentart:Zeitschriftenbeitrag
Titel:Atmospheric dust modeling from meso to global scales with the online NMMB/BSC-Dust model � Part 2: Experimental campaigns in Northern Africa
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Haustein, K.BSC, Barcelona, E
Perez, C.NASA Goddard Inst. for Space Studies, New York, USA
Baldasano, J.M.BSC, Barcelona, E
Jorba, O.BSC, Barcelona, E
Basart, S.BSC, Barcelona, E
Miller, R. L.NASA Goddard Inst. for Space Studies, New York, USA
Janjic, Z.NCEP, Camp Springs, MA, USA
Black, T.NCEP, Camp Springs, MA, USA
Nickovic, S.WMO, Geneva, CH
Todd, M.C.Univ. of Sussex, Brighton, UK
Washington, R.Univ. of Oxford, Oxford, UK
Müller, D.IfT, Leipzig
Tesche, M.IfT, Leipzig
Weinzierl, BernadettDLR
Esselborn, M.DLR
Schladitz, A.IfT, Leipzig
Datum:2012
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:12
DOI :10.5194/acp-12-2933-2012
Seitenbereich:Seiten 2933-2958
Status:veröffentlicht
Stichwörter:dust forecasts, online model
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:03 Aug 2012 18:19
Letzte Änderung:12 Dez 2013 21:44

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