An intercomparison of four wet deposition schemes used in dust transport modeling

Jung, Eunjoo; Shao, Yaping

doi:10.1016/j.gloplacha.2006.02.008

Cited by 26 publications

(28 citation statements)

References 39 publications

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“…Direct measurements of dust concentrations are needed as well as optical depths, to allow both modeled concentrations and parametrized radiative properties to be assessed. Improved understanding and parametrizations of wet and dry deposition processes are also required (Jung and Shao, 2006;Petroff et al, 2008). The representation of radiative properties is another area where development would be useful.…”

Section: Summary and Status Of Dust In Earth System Modelsmentioning

confidence: 99%

A review of natural aerosol interactions and feedbacks within the Earth system

et al. 2010

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Abstract.The natural environment is a major source of atmospheric aerosols, including dust, secondary organic material from terrestrial biogenic emissions, carbonaceous particles from wildfires, and sulphate from marine phytoplankton dimethyl sulphide emissions. These aerosols also have a significant effect on many components of the Earth system such as the atmospheric radiative balance and photosynthetically available radiation entering the biosphere, the supply of nutrients to the ocean, and the albedo of snow and ice. The physical and biological systems that produce these aerosols can be highly susceptible to modification due to climate change so there is the potential for important climate feedbacks. We review the impact of these natural systems on atmospheric aerosol based on observations and models, including the potential for long term changes in emissions and the feedbacks on climate. The number of drivers of change is very large and the various systems are strongly coupled. There have therefore been very few studies that integrate the various effects to estimate climate feedback factors. Nevertheless, available observations and model studies suggest that the regional radiative perturbations are potentially several Watts per square metre due to changes in these natural aerosol emissions in a future climate. Taking into account only the direct radiative effect of changes in the atmospheric burden of natural aerosols, and neglecting potentially large effects on other parts of the Earth system, a global mean radiative perturbation approaching 1 W m −2 is possible by the end of the century. The level of scientific understanding of the climate drivers, interactions and impacts is very low.

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Section: Summary and Status Of Dust In Earth System Modelsmentioning

confidence: 99%

A review of natural aerosol interactions and feedbacks within the Earth system

et al. 2010

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“…Tegen and Fung [] used a value of 750. Jung and Shao [] tested a value of 500 to compare different wet deposition schemes. This range fits quite well to the median S C mean (~600 to 2000) computed with the mean PM 10 concentrations, while the median S C max are slightly lower (55–142).…”

Section: Parameters Controlling the Deposition Fluxesmentioning

confidence: 99%

“…Based on these recommendations, scavenging ratios have been used to compute dust deposition in 3-D models Tegen and Fung [1994]. used a value of 750 Jung and Shao [2006]. tested a value of 500 to compare different wet deposition schemes.…”

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confidence: 99%

Mineral dust over west and central Sahel: Seasonal patterns of dry and wet deposition fluxes from a pluriannual sampling (2006–2012)

et al. 2017

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Total and wet mineral dust deposition has been monitored since 2006 at three Sahelian stations in Senegal, Mali, and Niger, respectively at the weekly and the event time scale. Average annual deposited mass fluxes range from 75 to 183 g m−2 yr−1, from west to east. Deposition fluxes exhibit a clear seasonal cycle in Mali and Niger. High wet deposition fluxes result from an optimum phasing between dust concentration and precipitation: the maximum occurring at the beginning of the wet season, after the maximum of dust concentration and before the precipitation maximum. The contribution of wet to total deposition varies from 67% in Mali to 8% in Senegal. It is the main factor of variability of the deposition fluxes from year to year and at the seasonal scale in Niger and Mali. Wet deposition fluxes in Mali and Niger are mainly due to the wash out of dust emitted by convective systems. In Senegal, the deposition fluxes are lower and dominated by dry deposition (92% of the annual deposition flux). This is due to the low occurrence of convective systems producing local dust emissions and intense wet deposition. The dry deposition fluxes are primarily driven by the variability of the dust concentration. The dry deposition velocities derived from our measurements are consistent with those estimated by theoretical models. Scavenging ratios computed from the measured wet deposition fluxes, dust concentrations, and precipitation are anticorrelated with precipitation amounts. This suggests that most of the atmospheric dust is scavenged at the very beginning of the precipitation events.

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“…Large uncertainties remain, for instance, on how dry and wet dust deposition processes are modelled (Zhao et al, 2003;Textor et al, 2006;Jung and Shao, 2006;Bergametti and Forêt, 2014). Few experimental field measurements of dust deposition have been performed recently López-Garcia et al, 2013;Heimburger et al, 2013;Osada et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

An automatic collector to monitor insoluble atmospheric deposition: application for mineral dust deposition

et al. 2015

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Abstract. Deposition is one of the key terms of the mineral dust cycle. However, dust deposition remains poorly constrained in transport models simulating the atmospheric dust cycle. This is mainly due to the limited number of relevant deposition measurements. This paper aims to present an automatic collector (CARAGA), specially developed to sample the total (dry and wet) atmospheric deposition of insoluble dust in remote areas. The autonomy of the CARAGA can range from 25 days to almost 1 year depending on the programmed sampling frequency (from 1 day to 2 weeks respectively). This collector is used to sample atmospheric deposition of Saharan dust on the Frioul islands in the Gulf of Lions in the Western Mediterranean. To quantify the mineral dust mass in deposition samples, a weighing and ignition protocol is applied. Almost 2 years of continuous deposition measurements performed on a weekly sampling basis on Frioul Island are presented and discussed with air mass trajectories and satellite observations of dust. Insoluble mineral deposition measured on Frioul Island was 2.45 g m −2

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An intercomparison of four wet deposition schemes used in dust transport modeling

Cited by 26 publications

References 39 publications

A review of natural aerosol interactions and feedbacks within the Earth system

A review of natural aerosol interactions and feedbacks within the Earth system

Mineral dust over west and central Sahel: Seasonal patterns of dry and wet deposition fluxes from a pluriannual sampling (2006–2012)

An automatic collector to monitor insoluble atmospheric deposition: application for mineral dust deposition

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