Testing the performance of state-of-the-art dust emission schemes using DO4Models field data

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dc.contributor.authorHaustein, K
dc.contributor.authorWashington, R
dc.contributor.authorKing, J
dc.contributor.authorWiggs, G
dc.contributor.authorThomas, D S G
dc.contributor.authorEckardt, F D
dc.contributor.authorBryant, R G
dc.contributor.authorMenut, L
dc.date.accessioned2021-10-08T07:04:08Z
dc.date.available2021-10-08T07:04:08Z
dc.date.issued2015
dc.description.abstractWithin the framework of the Dust Observations for Models (DO4Models) project, the performance of three commonly used dust emission schemes is investigated in this paper using a box model environment. We constrain the model with field data (surface and dust particle properties as well as meteorological parameters) obtained from a dry lake bed with a crusted surface in Botswana during a 3 month period in 2011. Our box model results suggest that all schemes fail to reproduce the observed horizontal dust flux. They overestimate the magnitude of the flux by several orders of magnitude. The discrepancy is much smaller for the vertical dust emission flux, albeit still overestimated by up to an order of magnitude. The key parameter for this mismatch is the surface crusting which limits the availability of erosive material, even at higher wind speeds. The second-most important parameter is the soil size distribution. Direct dust entrainment was inferred to be important for several dust events, which explains the smaller gap between modelled and measured vertical dust fluxes. We conclude that both features, crusted surfaces and direct entrainment, need to be incorporated into dust emission schemes in order to represent the entire spectra of source processes. We also conclude that soil moisture exerts a key control on the threshold shear velocity and hence the emission threshold of dust in the model. In the field, the state of the crust is the controlling mechanism for dust emission. Although the crust is related to the soil moisture content to some extent, we are not as yet able to deduce a robust correlation between state of crust and soil moisture.
dc.identifier.apacitationHaustein, K., Washington, R., King, J., Wiggs, G., Thomas, D. S. G., Eckardt, F. D., ... Menut, L. (2015). Testing the performance of state-of-the-art dust emission schemes using DO4Models field data. <i>Geoscientific Model Development</i>, 8(2), 341 - 362. http://hdl.handle.net/11427/34436en_ZA
dc.identifier.chicagocitationHaustein, K, R Washington, J King, G Wiggs, D S G Thomas, F D Eckardt, R G Bryant, and L Menut "Testing the performance of state-of-the-art dust emission schemes using DO4Models field data." <i>Geoscientific Model Development</i> 8, 2. (2015): 341 - 362. http://hdl.handle.net/11427/34436en_ZA
dc.identifier.citationHaustein, K., Washington, R., King, J., Wiggs, G., Thomas, D.S.G., Eckardt, F.D., Bryant, R.G. & Menut, L. et al. 2015. Testing the performance of state-of-the-art dust emission schemes using DO4Models field data. <i>Geoscientific Model Development.</i> 8(2):341 - 362. http://hdl.handle.net/11427/34436en_ZA
dc.identifier.issn1991-959X
dc.identifier.issn1991-9603
dc.identifier.ris TY - Journal Article AU - Haustein, K AU - Washington, R AU - King, J AU - Wiggs, G AU - Thomas, D S G AU - Eckardt, F D AU - Bryant, R G AU - Menut, L AB - Within the framework of the Dust Observations for Models (DO4Models) project, the performance of three commonly used dust emission schemes is investigated in this paper using a box model environment. We constrain the model with field data (surface and dust particle properties as well as meteorological parameters) obtained from a dry lake bed with a crusted surface in Botswana during a 3 month period in 2011. Our box model results suggest that all schemes fail to reproduce the observed horizontal dust flux. They overestimate the magnitude of the flux by several orders of magnitude. The discrepancy is much smaller for the vertical dust emission flux, albeit still overestimated by up to an order of magnitude. The key parameter for this mismatch is the surface crusting which limits the availability of erosive material, even at higher wind speeds. The second-most important parameter is the soil size distribution. Direct dust entrainment was inferred to be important for several dust events, which explains the smaller gap between modelled and measured vertical dust fluxes. We conclude that both features, crusted surfaces and direct entrainment, need to be incorporated into dust emission schemes in order to represent the entire spectra of source processes. We also conclude that soil moisture exerts a key control on the threshold shear velocity and hence the emission threshold of dust in the model. In the field, the state of the crust is the controlling mechanism for dust emission. Although the crust is related to the soil moisture content to some extent, we are not as yet able to deduce a robust correlation between state of crust and soil moisture. DA - 2015 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - Geoscientific Model Development LK - https://open.uct.ac.za PY - 2015 SM - 1991-959X SM - 1991-9603 T1 - Testing the performance of state-of-the-art dust emission schemes using DO4Models field data TI - Testing the performance of state-of-the-art dust emission schemes using DO4Models field data UR - http://hdl.handle.net/11427/34436 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34436
dc.identifier.vancouvercitationHaustein K, Washington R, King J, Wiggs G, Thomas DSG, Eckardt FD, et al. Testing the performance of state-of-the-art dust emission schemes using DO4Models field data. Geoscientific Model Development. 2015;8(2):341 - 362. http://hdl.handle.net/11427/34436.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Environmental and Geographical Science
dc.publisher.facultyFaculty of Science
dc.sourceGeoscientific Model Development
dc.source.journalissue2
dc.source.journalvolume8
dc.source.pagination341 - 362
dc.source.urihttps://dx.doi.org/10.5194/gmd-8-341-2015
dc.subject.otherQ
dc.subject.otherGeology
dc.subject.otherQE1-996.5
dc.subject.otherScience
dc.titleTesting the performance of state-of-the-art dust emission schemes using DO4Models field data
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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