Arid
DOI10.1007/s00703-014-0328-2
Simulation of biomass burning aerosols mass distributions and their direct and semi-direct effects over South Africa using a regional climate model
Tesfaye, M.1,2; Botai, J.1; Sivakumar, V.1,3; Tsidu, G. Mengistu4
通讯作者Tesfaye, M.
来源期刊METEOROLOGY AND ATMOSPHERIC PHYSICS
ISSN0177-7971
EISSN1436-5065
出版年2014
卷号125期号:3-4页码:177-195
英文摘要

In this study, we examine the mass distributions, direct and semi-direct effects of different biomass burning aerosols (BBAs) over South Africa using the 12-year runs of the Regional Climate Model (RegCM4). The results were analyzed and presented for the main BB season (July-October). The results show that Mpumalanga, KwaZulu Natal and the eastern parts of Limpopo are the main local source areas of BBAs in South Africa. In comparison to carbonaceous aerosols, BB-induced sulfate aerosol mass loading and climatic effects were found to be negligible. All carbonaceous aerosols reduce solar radiation at the surface by enhancing local atmospheric radiative heating. The climatic feedback caused by BBAs, resulted in changes in background aerosol concentrations. Thus, on a regional scale, climatic effects of BBAs were also found in areas far away from the BBA loading zones. The feedback mechanisms of the climate system to the aerosol radiative effects resulted in both positive and negative changes to the low-level columnar averaged net atmospheric radiative heating rate (NAHR). Areas that experienced an NAHR reduction showed an increase in cloud cover (CC). During the NAHR enhancement, CC over arid areas decreased; whereas CC over the wet/semi-wet regions increased. The changes in surface temperature (ST) and surface sensible heat flux are more closely correlated with BBA semi-direct effects induced CC alteration than their direct radiative forcing. Furthermore, decreases (or increases) in ST, respectively, lead to the reductions (and enhancements) in boundary layer height and the vice versa on surface pressure. The direct and semi-direct effects of BBAs also jointly promoted a reduction and rise in surface wind speed that was spatially highly variable. Overall, the results suggest that the CC change induced by the presence of radiatively interactive BBAs is important to determine alterations in other climatic variables.


类型Article
语种英语
国家South Africa ; Ethiopia
收录类别SCI-E
WOS记录号WOS:000339890800006
WOS关键词INITIATIVE SAFARI 2000 ; HYDROLOGICAL CYCLE ; BLACK CARBON ; TRACE GASES ; VEGETATION FIRE ; DUST AEROSOLS ; WEST-AFRICA ; CLOUD COVER ; EMISSIONS ; SENSITIVITY
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183861
作者单位1.Univ Pretoria, Dept Geog Geoinformat & Meteorol, ZA-0002 Pretoria, South Africa;
2.CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa;
3.Univ KwaZulu Natal, Sch Chem & Phys, Discipline Phys, ZA-4000 Durban, South Africa;
4.Univ Addis Ababa, Dept Phys, Addis Ababa, Ethiopia
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Tesfaye, M.,Botai, J.,Sivakumar, V.,et al. Simulation of biomass burning aerosols mass distributions and their direct and semi-direct effects over South Africa using a regional climate model[J],2014,125(3-4):177-195.
APA Tesfaye, M.,Botai, J.,Sivakumar, V.,&Tsidu, G. Mengistu.(2014).Simulation of biomass burning aerosols mass distributions and their direct and semi-direct effects over South Africa using a regional climate model.METEOROLOGY AND ATMOSPHERIC PHYSICS,125(3-4),177-195.
MLA Tesfaye, M.,et al."Simulation of biomass burning aerosols mass distributions and their direct and semi-direct effects over South Africa using a regional climate model".METEOROLOGY AND ATMOSPHERIC PHYSICS 125.3-4(2014):177-195.
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