Mineral dust aerosol distributions, its direct and semi-direct effects over South Africa based on regional climate model simulation

M. Tesfaye, G. Mengistu Tsidu, J. Botai, V. Sivakumar, C. J. deW. Rautenbach

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The present contribution investigates the seasonal mean mass distributions, direct and semi-direct climatic effects of desert dust aerosols over South Africa, using the 12 year runs of Regional Climate Model (RegCM4). The results have shown that the desert dust particles which burden the western and southern regions of South Africa are mainly produced from the Kalahari and Namib Desert areas. At the surface and within the atmosphere, the short- and long-wave radiative forcing (RF) of dust showed contrasting effects. However, due to the dust short-wave RF dominant influence, the Net-RF of dust causes reduction on net radiation absorbed by the surface via enhancing radiative heating in the atmosphere. The radiative feedbacks of desert dust particles predominantly result in a positive response on net atmospheric radiative heating rate, Cloud Cover (CC) and cloud liquid water path. The CC enhancement and Net-RF of dust, cooperatively, induce reduction in surface temperature (up to-1.1K) and surface sensible heat flux (up to-24W/m2). The presence of desert dust aerosol also causes boundary layer height reduction, surface pressure enhancement and dynamical changes. Overall, the present contribution underscores the importance of including the effects of wind-eroded dust particles in climate change studies over South Africa.

    Original languageEnglish
    Pages (from-to)22-40
    Number of pages19
    JournalJournal of Arid Environments
    Volume114
    DOIs
    Publication statusPublished - Mar 1 2015

    Fingerprint

    climate models
    aerosols
    dust
    regional climate
    climate modeling
    South Africa
    aerosol
    minerals
    mineral
    deserts
    radiative forcing
    simulation
    desert
    heat
    cloud cover
    heating
    distribution
    effect
    Africa
    atmosphere

    All Science Journal Classification (ASJC) codes

    • Ecology, Evolution, Behavior and Systematics
    • Earth-Surface Processes
    • Ecology

    Cite this

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    abstract = "The present contribution investigates the seasonal mean mass distributions, direct and semi-direct climatic effects of desert dust aerosols over South Africa, using the 12 year runs of Regional Climate Model (RegCM4). The results have shown that the desert dust particles which burden the western and southern regions of South Africa are mainly produced from the Kalahari and Namib Desert areas. At the surface and within the atmosphere, the short- and long-wave radiative forcing (RF) of dust showed contrasting effects. However, due to the dust short-wave RF dominant influence, the Net-RF of dust causes reduction on net radiation absorbed by the surface via enhancing radiative heating in the atmosphere. The radiative feedbacks of desert dust particles predominantly result in a positive response on net atmospheric radiative heating rate, Cloud Cover (CC) and cloud liquid water path. The CC enhancement and Net-RF of dust, cooperatively, induce reduction in surface temperature (up to-1.1K) and surface sensible heat flux (up to-24W/m2). The presence of desert dust aerosol also causes boundary layer height reduction, surface pressure enhancement and dynamical changes. Overall, the present contribution underscores the importance of including the effects of wind-eroded dust particles in climate change studies over South Africa.",
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    Mineral dust aerosol distributions, its direct and semi-direct effects over South Africa based on regional climate model simulation. / Tesfaye, M.; Tsidu, G. Mengistu; Botai, J.; Sivakumar, V.; deW. Rautenbach, C. J.

    In: Journal of Arid Environments, Vol. 114, 01.03.2015, p. 22-40.

    Research output: Contribution to journalArticle

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