Arid
DOI10.1002/joc.4225
Simulation of anthropogenic aerosols mass distributions and analysing their direct and semi-direct effects over South Africa using RegCM4
Tesfaye, M.1,2; Sivakumar, V.1,3; Botai, J.1; Tsidu, G. Mengistu4; Rautenbach, C. J. deW.1
通讯作者Tesfaye, M.
来源期刊INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN0899-8418
EISSN1097-0088
出版年2015
卷号35期号:12页码:3515-3539
英文摘要

This study examines the mass distributions and direct and semi-direct effects of different Anthropogenic Aerosols (AAs) [i.e. sulphate, Black Carbon (BC), Organic Carbon (OC) and all together (SBO)] over South Africa using the 12 year runs of the Regional Climate Model (RegCM4). The maximum burden and Surface Radiative Forcing (SRF) values are found over AA source regions: up to 9mg m(-2) [-12W m(-2)] for sulphate and 12.1mg m(-2) [-14W m(-2)] for SBO during austral summer, as well as, up to 0.85mg m(-2) [-2W m(-2)] for BC and 2.2mg m(-2) [-0.68W m(-2)] for OC during austral winter. Contrary to sulphate, both BC and OC aerosols reduce incoming solar radiation reaching the ground via enhancing shortwave radiative heating in the atmosphere. The climatic feedback caused by AAs resulted in changes in background aerosol concentrations. As a result of this and other processes of the climate system, the climatic effects of AAs were also found in remote areas away from the main AA loading zones. However, in terms of statistical significance, the climatic influences of AAs are more prominent in the vicinity of their source regions. The overall feedback of the climate system to the radiative effects of AAs resulted in both positive and negative changes to the Net Atmospheric radiative Heating Rate (NAHR). Areas that experience a reduction in NAHR exhibited an increase in Cloud Cover (CC). During the NAHR enhancement, CC over arid areas decreased; while CC over the wet/semi-wet regions increased. The changes in Surface Temperature (ST) and sensible heat flux are more closely correlated with the CC change than SRF of AAs. Furthermore, decreases or increases in ST, respectively, lead to reductions or enhancements in boundary layer height and the vice versa in surface pressure. Overall, the results suggest that the feedback of cloud fields has a far-reaching role in moderating other climatic anomalies.


英文关键词anthropogenic aerosols aerosol-climate interactions radiative forcing semi-direct effects regional climate model South Africa
类型Article
语种英语
国家South Africa ; Ethiopia
收录类别SCI-E
WOS记录号WOS:000362731000009
WOS关键词REGIONAL CLIMATE MODEL ; GENERAL-CIRCULATION MODEL ; BLACK CARBON AEROSOL ; HYDROLOGICAL CYCLE ; GLOBAL CLIMATE ; DUST AEROSOLS ; WEST-AFRICA ; EAST-ASIA ; SENSITIVITY ; EMISSIONS
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/2XILL650/187967
作者单位1.Univ Pretoria, Dept Geog Geoinformat & Meteorol, Eskom Sasol Lab Atmospher Studies, ZA-0002 Pretoria, South Africa;
2.CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa;
3.Univ KwaZulu Natal, Sch Chem & Phys, Discipline Phys, Durban, South Africa;
4.Univ Addis Ababa, Dept Phys, Addis Ababa, Ethiopia
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Tesfaye, M.,Sivakumar, V.,Botai, J.,et al. Simulation of anthropogenic aerosols mass distributions and analysing their direct and semi-direct effects over South Africa using RegCM4[J],2015,35(12):3515-3539.
APA Tesfaye, M.,Sivakumar, V.,Botai, J.,Tsidu, G. Mengistu,&Rautenbach, C. J. deW..(2015).Simulation of anthropogenic aerosols mass distributions and analysing their direct and semi-direct effects over South Africa using RegCM4.INTERNATIONAL JOURNAL OF CLIMATOLOGY,35(12),3515-3539.
MLA Tesfaye, M.,et al."Simulation of anthropogenic aerosols mass distributions and analysing their direct and semi-direct effects over South Africa using RegCM4".INTERNATIONAL JOURNAL OF CLIMATOLOGY 35.12(2015):3515-3539.
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