Relationships between horizontal transport flux and vertical deposition flux during dry deposition of atmospheric dust particles

Goossens, Dirk

doi:10.1029/2007jf000775

Cited by 19 publications

(18 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The MWAC samplers do not measure deposition fluxes but instead measure dust concentrations. Only 1 % or less drops out of a moving dust cloud within 5 min; hence, the horizontal dust flux is at least ∼ 100 times higher than the dust deposition flux (Goossens, 2008). The fact that the dust fluxes decreased with height (not shown) further complicated a comparison between the sites due to the different sampling heights of the dust collectors (2.90 m at Iwik versus sediment traps in the water).…”

Section: Identification Of Dust Source Regionsmentioning

confidence: 97%

Seasonal provenance changes of present-day Saharan dust collected on- and offshore Mauritania

Friese¹,

Hateren²,

Vogt³

et al. 2017

Preprint

View full text Add to dashboard Cite

Abstract. Saharan dust has a crucial influence on the earth climate system and its emission, transport and deposition are intimately related to, e.g., wind speed, precipitation, temperature and vegetation cover. The alteration in the physical and chemical properties of Saharan dust due to environmental changes is often used to reconstruct the climate of the past. However, to better interpret possible climate changes the dust source regions need to be known. By analysing the mineralogical composition of transported or deposited dust, potential dust source areas can be inferred. Summer dust transport off northwest Africa occurs in the Saharan air layer (SAL). In continental dust source areas, dust is also transported in the SAL; however, the predominant dust input occurs from nearby dust sources with the low-level trade winds. Hence, the source regions and related mineralogical tracers differ with season and sampling location. To test this, dust collected in traps onshore and in oceanic sediment traps off Mauritania during 2013 to 2015 was analysed. Meteorological data, particle-size distributions, back-trajectory and mineralogical analyses were compared to derive the dust provenance and dispersal. For the onshore dust samples, the source regions varied according to the seasonal changes in trade-wind direction. Gibbsite and dolomite indicated a Western Saharan and local source during summer, while chlorite, serpentine and rutile indicated a source in Mauritania and Mali during winter. In contrast, for the samples that were collected offshore, dust sources varied according to the seasonal change in the dust transporting air layer. In summer, dust was transported in the SAL from Mauritania, Mali and Libya as indicated by ferroglaucophane and zeolite. In winter, dust was transported with the trades from Western Sahara as indicated by, e.g., fluellite.

show abstract

Section: Identification Of Dust Source Regionsmentioning

confidence: 97%

Seasonal provenance changes of present-day Saharan dust collected on- and offshore Mauritania

Friese¹,

Hateren²,

Vogt³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…Wet deposition processes correspond to the capture of particles by droplets either inside or below the clouds (Dana and Hales, 1976;Slinn, 1984;Garcia Nieto et al, 1994). These deposition processes of atmospheric particles are supposed to be well understood.…”

Section: Previous Studies Of Dust Deposition Samplingmentioning

confidence: 99%

“…Quantitative estimates of dust deposition remain challenging (see for example Wiggs et al, 2002;Goossens and Rajot, 2008). Various techniques have been proposed to directly measure or to estimate (from atmospheric concentrations) dry deposition of dust on surfaces (Seinfeld and Pandis, 1998;Etyemezian et al, 2003;Goossens, 2005;Sow et al, 2006). Experimental studies usually show a wide range in dry deposition values, depending on the sampling device (Goossens and Rajot, 2008).…”

Section: Previous Studies Of Dust Deposition Samplingmentioning

confidence: 99%

“…These deposition processes of atmospheric particles are supposed to be well understood. However, most of the theoretical understanding and parameterizations of deposition were based on studies and measurements performed under controlled conditions, for instance in wind tunnels (Chamberlain, 1967;Goossens, 2008) or towers and laboratories (Wang and Pruppacher, 1977;Leong et al, 1982;Barlow and Latham, 1983;Pranesha and Kamra, 1996).…”

Section: Previous Studies Of Dust Deposition Samplingmentioning

confidence: 99%

“…Various techniques have been proposed to directly measure or to estimate (from atmospheric concentrations) dry deposition of dust on surfaces (Seinfeld and Pandis, 1998;Etyemezian et al, 2003;Goossens, 2005;Sow et al, 2006). Experimental studies usually show a wide range in dry deposition values, depending on the sampling device (Goossens and Rajot, 2008). Even if wet deposition measurements are easier to perform, correctly sampling the first millimetres of a precipitation event is crucial to precisely measure wet deposition (Claassen and Halm, 1995).…”

Section: Previous Studies Of Dust Deposition Samplingmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2015

View full text Add to dashboard Cite

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

show abstract

Gross erosion, net erosion and gross deposition of dust by wind: field data from 17 desert surfaces

Buck

2010

Earth Surf Processes Landf

Self Cite

View full text Add to dashboard Cite

Wind erosion measurements were carried out in Nellis Dunes Recreation Area, southern Nevada, USA. Gross erosion (the total mass of sediment effectively blown away from a surface), gross deposition (the total mass of sediment effectively depositing on a surface) and net erosion (the difference in sediment mass before and after an event) were measured for 1 year, on 17 different types of surfaces developed on loose dune sand, compacted sand, loose silt, compacted and/or aggregated silt, rock-covered sands and silts, mixtures of sand, silt and clay, exposed petrocalcic horizons, gravelly substrata and bedrock. Results showed that net erosion, which is the type of erosion measured in field and laboratory experiments, strongly differs from gross erosion. Activity on a surface is much higher than classic net erosion measurements suggest. Future studies on wind erosion should better acknowledge the distinction between the two types of process. Also, a grain diameter of maximum susceptibility to wind erosion ('optimum deflation diameter') near 70 mm as proposed by the aeolian literature only exists for net wind erosion. No such optimum diameter was found for gross wind erosion within the particle range 0-100 mm delineating the transport modes of suspension and modified saltation. In addition, desert surfaces predominantly composed of sand did not show an optimum deflation diameter (for net erosion) around 70 mm. Instead, there was a preferential grain size around 15 mm at which particles were most vulnerable to net emission. Desert surfaces poor in sand showed the classic value of 70 mm. This suggests that interactions exist between the type of surface and the susceptibility of particles to wind erosion. This study is solely based on field data. Although results are supported by two previous wind tunnel studies, more wind tunnel experiments documenting the interactions between gross erosion and gross deposition are necessary.

show abstract

Relationships between horizontal transport flux and vertical deposition flux during dry deposition of atmospheric dust particles

Cited by 19 publications

References 30 publications

Seasonal provenance changes of present-day Saharan dust collected on- and offshore Mauritania

Seasonal provenance changes of present-day Saharan dust collected on- and offshore Mauritania

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

Gross erosion, net erosion and gross deposition of dust by wind: field data from 17 desert surfaces

Contact Info

Product

Resources

About