Aerosol type influences on air and climate over the southern hemisphere

IF 2.9 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Air Quality Atmosphere and Health Pub Date : 2025-07-26 DOI:10.1007/s11869-025-01801-9

Ibtissam Marsli, Mohammed Diouri

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引用次数: 0

Abstract

Southern hemisphere (SH) registers significant seasonal variations due to westerly winds, and observes an important intercontinental air pollution transport. We investigate aerosol optical properties based on AERONET/PHOTONS ground measurements of fifteen SH sites. Aerosol optical depth AOD_0,5 increases from August to October over South African sites with a peak reaching 0.4, and aerosol particle size distributions display the predominance of fine mode. However, the coarse mode was high in East Africa. The relating AOD_0,5 versus Ångström exponent (α_0.44–0.87) shows a dominated two main aerosol types, marine aerosols (CM) neighboring to the ocean, and urban/industrial pollution and biomass-burning particles (BB/UI). The aerosol radiative forcing of the vertical columnar atmospheric balance showed a heating effect in all sites with high values observed over South African sites suggesting a large abundance of absorbing aerosols and mostly biomass burning. The variation of single scattering albedo (SSA) over all the studied sites reveals the presence of many aerosol particle classes during the whole period (2018–19).

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气溶胶类型对南半球空气和气候的影响

南半球（SH）由于西风的影响，具有显著的季节变化，是重要的洲际空气污染输送。我们研究了基于AERONET/光子地面测量的气溶胶光学特性。8 ~ 10月，南非站点气溶胶光学深度AOD0,5增加，峰值达到0.4，气溶胶粒径分布以细模为主。然而，东非的粗态较高。AOD0,5与Ångström指数（α0.44-0.87）的相关关系表明，主要有两种气溶胶类型，即邻近海洋的海洋气溶胶（CM）和城市/工业污染和生物质燃烧颗粒（BB/UI）。垂直柱状大气平衡的气溶胶辐射强迫在所有站点都显示出加热效应，在南非站点观测到的数值较高，这表明大量气溶胶被吸收，主要是生物质燃烧。所有研究站点的单散射反照率（SSA）变化揭示了整个时期（2018 - 2019年）存在多种气溶胶颗粒类别。

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来源期刊

Air Quality Atmosphere and Health ENVIRONMENTAL SCIENCES-

CiteScore

8.80

自引率

2.00%

发文量

146

审稿时长

>12 weeks

期刊介绍： Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health. It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes. International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals. Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements. This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.