A comparison of two dust uplift schemes within the same general circulation model

Ackerley, Duncan, Joshi, Manoj M. ORCID: https://orcid.org/0000-0002-2948-2811, Highwood, Eleanor J., Ryder, Claire L., Harrison, Mark A. J., Walters, David N., Milton, Sean F. and Strachan, Jane (2012) A comparison of two dust uplift schemes within the same general circulation model. Advances in Meteorology, 2012. ISSN 1687-9309

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Aeolian dust modelling has improved significantly over the last ten years and many institutions now consistently model dust uplift, transport and deposition in general circulation models (GCMs). However, the representation of dust in GCMs is highly variable between modelling communities due to differences in the uplift schemes employed and the representation of the global circulation that subsequently leads to dust deflation. In this study two different uplift schemes are incorporated in the same GCM. This approach enables a clearer comparison of the dust uplift schemes themselves, without the added complexity of several different transport and deposition models. The global annual mean dust aerosol optical depths (at 550 nm) using two different dust uplift schemes were found to be 0.014 and 0.023—both lying within the estimates from the AeroCom project. However, the models also have appreciably different representations of the dust size distribution adjacent to the West African coast and very different deposition at various sites throughout the globe. The different dust uplift schemes were also capable of influencing the modelled circulation, surface air temperature, and precipitation despite the use of prescribed sea surface temperatures. This has important implications for the use of dust models in AMIP-style (Atmospheric Modelling Intercomparison Project) simulations and Earth-system modelling.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Faculty of Science > Research Groups > Climatic Research Unit
University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research
Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research
Depositing User: Users 2731 not found.
Date Deposited: 15 Oct 2012 12:22
Last Modified: 25 Jan 2024 01:20
URI: https://ueaeprints.uea.ac.uk/id/eprint/39874
DOI: 10.1155/2012/260515

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