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Modelling mineral dust emissions and atmospheric dispersion with MADE3 in EMAC v2.54

Beer, Christoph G. and Hendricks, Johannes and Righi, Mattia and Heinold, Bernd and Tegen, Ina and Groß, Silke Martha and Sauer, Daniel and Walser, Adrian and Weinzierl, Bernadett (2020) Modelling mineral dust emissions and atmospheric dispersion with MADE3 in EMAC v2.54. Geoscientific Model Development, 13 (9), pp. 4287-4303. Copernicus Publications. doi: 10.5194/gmd-13-4287-2020. ISSN 1991-959X.

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Official URL: https://gmd.copernicus.org/articles/13/4287/2020/

Abstract

It was hypothesized that using mineral dust emission climatologies in global chemistry climate models (GCCMs), i.e. prescribed monthly-mean dust emissions representative of a specific year, may lead to misrepresentations of strong dust burst events. This could result in a negative bias of model dust concentrations compared to observations for these episodes. Here, we apply the aerosol microphysics submodel MADE3 (Modal Aerosol Dynamics model for Europe, adapted for global applications, third generation) as part of the ECHAM/MESSy Atmospheric Chemistry (EMAC) general circulation model. We employ two different representations of mineral dust emissions for our model simulations: (i) a prescribed monthly-mean climatology of dust emissions representative of the year 2000 and (ii) an online dust parametrization which calculates wind-driven mineral dust emissions at every model time step. We evaluate model results for these two dust representations by comparison with observations of aerosol optical depth from ground-based station data. The model results show a better agreement with the observations for strong dust burst events when using the online dust representation compared to the prescribed dust emissions setup. Furthermore, we analyse the effect of increasing the vertical and horizontal model resolution on the mineral dust properties in our model. We compare results from simulations with T42L31 and T63L31 model resolution (2.8 by 2.8 degrees and 1.9 by 1.9 degrees in latitude and longitude, respectively; 31 vertical levels) with the reference setup (T42L19). The different model versions are evaluated against airborne in situ measurements performed during the SALTRACE mineral dust campaign (Saharan Aerosol Long-range Transport and Aerosol-Cloud Interaction Experiment, June-July 2013), i.e. observations of dust transported from the Sahara to the Caribbean. Results show that an increased horizontal and vertical model resolution is able to better represent the spatial distribution of airborne mineral dust, especially in the upper troposphere (above 400 hPa). Additionally, we analyse the effect of varying assumptions for the size distribution of emitted dust but find only a weak sensitivity concerning these changes. The results of this study will help to identify the model setup best suited for future studies and to further improve the representation of mineral dust particles in EMAC-MADE3.

Item URL in elib:https://elib.dlr.de/136111/
Document Type:Article
Title:Modelling mineral dust emissions and atmospheric dispersion with MADE3 in EMAC v2.54
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Beer, Christoph G.DLR, IPAhttps://orcid.org/0000-0003-3815-0007
Hendricks, JohannesDLR, IPAUNSPECIFIED
Righi, MattiaDLR, IPAhttps://orcid.org/0000-0003-3827-5950
Heinold, BerndTROPOS, LeipzigUNSPECIFIED
Tegen, InaTROPOS, Leipzighttps://orcid.org/0000-0003-3700-3232
Groß, Silke Marthadlr, ipahttps://orcid.org/0000-0002-7467-9269
Sauer, DanielDLR, IPA & Univ. Münchenhttps://orcid.org/0000-0002-0317-5063
Walser, AdrianUniv. Wien, Österreich & Univ. München & DLR, IPAhttps://orcid.org/0000-0003-0175-8211
Weinzierl, BernadettUniv. Wien, Österreichhttps://orcid.org/0000-0003-4555-5686
Date:16 September 2020
Journal or Publication Title:Geoscientific Model Development
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:13
DOI :10.5194/gmd-13-4287-2020
Page Range:pp. 4287-4303
Publisher:Copernicus Publications
ISSN:1991-959X
Status:Published
Keywords:Global modelling, Aerosol, Mineral Dust
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Transport und Klima, R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Institute of Atmospheric Physics > Atmospheric Trace Species
Institute of Atmospheric Physics > Lidar
Deposited By: Beer, Christof Gerhard
Deposited On:17 Sep 2020 14:36
Last Modified:17 Sep 2020 14:36

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