Mesoscale modeling of aeolian dust emission during the BoDEx 2005 experiment

Bouet, Christel; Cautenet, G.; Washington, Richard; Todd, Martin C.; Bouchet, L.; Marticorena, Béatrice; Bergametti, Gilles

doi:10.1029/2006gl029184

Cited by 24 publications

(30 citation statements)

References 22 publications

(35 reference statements)

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“…Koren and Kaufman (2004) showed that NCEP (National Centre for Environmental Prediction) reanalysis winds underestimate by factor 2 the actual speed of the dust front in this region. Similarly, Bouet et al (2007) found that ECMWF wind surface reanalysis are significantly underestimated compare to the surface wind locally measured in Chicha (Chad) in March 2005 during the the BoDEx 2005 experiment .The ECMWF 10 m surface winds have been compared to the surface wind measured at the meteorological station of Faya-Largeau, located at the North-Eastern edge of the Bodélé depression for the period January to March 2004, a period during which a sufficient number of observations is available both during day and night (Fig. 2).…”

Section: Meteorological Fieldsmentioning

confidence: 99%

“…Tegen et al, 2006;Bouet et al, 2007;Heinold et al, 2007;Tulet et al, 2008;Bou Karam et al, 2009;Stanelle et al, 2010) allow a more accurate description of the dynamics processes involved in the mineral dust cycle. However, these modelling tools are time-consuming and thus are mainly used for the simulations of case-studies.…”

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confidence: 99%

“…However, these modelling tools are time-consuming and thus are mainly used for the simulations of case-studies. As an example, Heinold et al (2007) simulated two major Saharan dust outbreaks transported towards Europe in August and October 2001 with the LM-MUSCAT dust model while Bouet et al (2007), simulated the surface measurements from the BoDEx Experiment with the RAMS (Regional Atmospheric Modelling System) model. More recently, Schepanski et al (2009) investigated the Saharan dust transport and deposition toward the Atlantic Ocean based on three months of simulation with the LM-MUSCAT dust model.…”

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confidence: 99%

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Simulation of the mineral dust content over Western Africa from the event to the annual scale with the CHIMERE-DUST model

et al. 2011

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Abstract.The chemistry and transport model CHIMERE-DUST have been used to simulate the mineral dust cycle over the Sahara in 2006. Surface measurements deployed during the AMMA field campaign allow to test the capability of the model to correctly reproduce the atmospheric dust load and surface concentrations from the daily to the seasonal time-scale. The simulated monthly mean Aerosol Optical Depths (AOD) and surface concentrations are significantly correlated with the measured ones. The simulated daily concentrations and hourly AOD are in the same range of magnitude than the observed ones despite relatively high simulated dust emissions. The level of agreement between the simulations and the observations has been quantified at different time scales using statistical parameters classically used to evaluate air quality models. The capability of the model to reproduce the altitude of the dust transport was tested for two contrasted cases of low and high altitude transport. These results highlight the sensitivity of the simulations to the surface winds used as external forcing and the necessity to further constrain the dust mass budget at the regional scale.

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Section: Meteorological Fieldsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Simulation of the mineral dust content over Western Africa from the event to the annual scale with the CHIMERE-DUST model

et al. 2011

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“…The data from both campaigns have already been used for extensive model evaluation (e.g. Tegen et al, 2006;Bouet et al, 2007;Todd et al, 2007Todd et al, , 2008aHaustein et al, 2009;Heinold et al, 2009;Müller et al, 2009;Otto et al, 2009Otto et al, , 2011. The first phase of SAMUM-1 took place in May/June 2006 at three sites in Morocco accompanied by overflights of two research aircraft as integral part of the campaign.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2012

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Abstract.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 (Pérez 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 0.6-0.7 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 Bodélé 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 Published by Copernicus Publications on behalf of the European Geosciences Union. K. Haustein et al.: NMMB/BSC-Dust Regional test casespart 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 Bodélé 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.

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“…Despite the issues associated with the lack of observational data to constrain dust models, there have been extensive developments for representing individual dust events within the Sahara Desert as given by Bouet et al (2007) (BoDEx), Heinold et al (2007) (SAMUM) and Kallos et al (2006). A model capable of representing individual dust events gives more confidence within the dust modelling community of representing the climatological impacts of desert dust (Mahowald et al, 2006a,b;Yoshioka et al, 2007) as well as for Numerical Weather Prediction (NWP) models (Allan et al, 2007;Jiménez-Guerrero et al, 2008) which can be used to generate short-term dust forecasts.…”

Section: Introductionmentioning

confidence: 99%

The development of a new dust uplift scheme in the Met Office Unified Model™

Ackerley

Highwood

Harrison

et al. 2009

Meteorological Applications

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Aeolian mineral dust aerosol is an important consideration in the Earth's radiation budget as well as a source of nutrients to oceanic and land biota. The modelling of aeolian mineral dust has been improving consistently despite the relatively sparse observations to constrain them. This study documents the development of a new dust emissions scheme in the Met Office Unified Model  (MetUM) based on the Dust Entrainment and Deposition (DEAD) module. Four separate case studies are used to test and constrain the model output. Initial testing was undertaken on a large dust event over North Africa in March 2006 with the model constrained using AERONET data. The second case study involved testing the capability of the model to represent dust events in the Middle East without being re-tuned from the March 2006 case in the Sahara. While the model is unable to capture some of the daytime variation in AERONET AOD there is good agreement between the model and observed dust events. In the final two case studies new observations from in situ aircraft data during the Dust Outflow and Deposition to the Ocean (DODO) campaigns in February and August 2006 were used. These recent observations provided further data on dust size distributions and vertical profiles to constrain the model. The modelled DODO cases were also compared to AERONET data to make sure the radiative properties of the dust were comparable to observations.

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Mesoscale modeling of aeolian dust emission during the BoDEx 2005 experiment

Cited by 24 publications

References 22 publications

Simulation of the mineral dust content over Western Africa from the event to the annual scale with the CHIMERE-DUST model

Simulation of the mineral dust content over Western Africa from the event to the annual scale with the CHIMERE-DUST model

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

The development of a new dust uplift scheme in the Met Office Unified Model™

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