Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jastp.2016.02.013 |
Simulation of bulk aerosol direct radiative effects and its climatic feedbacks in South Africa using RegCM4 | |
Tesfaye, M.1,2,3; Botai, J.1,3; Sivakumar, V.4; Tsidu, G. Mengistu5,6; Rautenbach, C. J. deW.1; Moja, Shadung J.2,7 | |
通讯作者 | Tesfaye, M. |
来源期刊 | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
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ISSN | 1364-6826 |
EISSN | 1879-1824 |
出版年 | 2016 |
卷号 | 142页码:1-19 |
英文摘要 | In this study, 12 year runs of the Regional Climate Model (RegCM4) have been used to analyze the bulk aerosol radiative effects and its climatic feedbacks in South Africa. Due to the geographical locations where the aerosol potential source regions are situated and the regional dynamics, the South African aerosol spatial-distribution has a unique feature. Across the west and southwest areas, desert dust particles are dominant. However, sulfate and carbonaceous aerosols are primarily distributed over the east and northern regions of the country. Analysis of the Radiative Effects (RE) shows that in South Africa the bulk aerosols play a role in reducing the net radiation absorbed by the surface via enhancing the net radiative heating in the atmosphere. Hence, across all seasons, the bulk aerosol-radiation-climate interaction induced statistically significant positive feedback on the net atmospheric heating rate. Over the western and central parts of South Africa, the overall radiative feedbacks of bulk aerosol predominantly induces statistically significant Cloud Cover (CC) enhancements. Whereas, over the east and southeast coastal areas, it induces minimum reductions in CC. The CC enhancement and RE of aerosols jointly induce radiative cooling at the surface which in turn results in the reduction of Surface Temperature (ST: up to -1 K) and Surface Sensible Heat Flux (SSHF: up to -24 W/m(2)). The ST and SSHF decreases cause a weakening of the convectively driven turbulences and surface buoyancy fluxes which lead to the reduction of the boundary layer height, surface pressure enhancement and dynamical changes. Throughout the year, the maximum values of direct and semi-direct effects of bulk aerosol were found in areas of South Africa which are dominated by desert dust particles. This signals the need for a strategic regional plan on how to reduce the dust production and monitoring of the dust dispersion as well as it initiate the need of further research on different aspects of dust particle in South Africa. (C) 2016 Elsevier Ltd. All rights reserved. |
英文关键词 | Aerosol radiative effects Aerosol-radiation-climate interactions Regional climate model South Africa |
类型 | Article |
语种 | 英语 |
国家 | South Africa ; Botswana ; Ethiopia |
收录类别 | SCI-E |
WOS记录号 | WOS:000374079700001 |
WOS关键词 | MINERAL DUST AEROSOL ; REGIONAL CLIMATE ; HYDROLOGICAL CYCLE ; BLACK CARBON ; WEST-AFRICA ; ANTHROPOGENIC AEROSOLS ; AIR TRANSPORT ; TRACE GASES ; MARCH 2006 ; EAST-ASIA |
WOS类目 | Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/194240 |
作者单位 | 1.South African Weather Serv, Pretoria, South Africa; 2.Univ S Africa, Dept Environm Sci, Florida Sci Campus, ZA-0001 Pretoria, South Africa; 3.Univ Pretoria, Dept Geog Geoinformat & Meteorol, Lynwood Rd, ZA-0002 Pretoria, South Africa; 4.Univ KwaZulu Natal, Sch Chem & Phys, Discipline Phys, ZA-4000 Durban, South Africa; 5.Botswana Int Univ Technol & Sci, Dept Earth & Environm Sci, Palapye, Botswana; 6.Univ Addis Ababa, Dept Phys, POB 1176, Addis Ababa, Ethiopia; 7.Council Geosci, D&O Sect, 280 Pretoria St, Pretoria, South Africa |
推荐引用方式 GB/T 7714 | Tesfaye, M.,Botai, J.,Sivakumar, V.,et al. Simulation of bulk aerosol direct radiative effects and its climatic feedbacks in South Africa using RegCM4[J],2016,142:1-19. |
APA | Tesfaye, M.,Botai, J.,Sivakumar, V.,Tsidu, G. Mengistu,Rautenbach, C. J. deW.,&Moja, Shadung J..(2016).Simulation of bulk aerosol direct radiative effects and its climatic feedbacks in South Africa using RegCM4.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,142,1-19. |
MLA | Tesfaye, M.,et al."Simulation of bulk aerosol direct radiative effects and its climatic feedbacks in South Africa using RegCM4".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 142(2016):1-19. |
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