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DOI	10.1016/j.atmosenv.2020.117658
	Two heavy haze events over Lumbini in southern Nepal: Enhanced aerosol radiative forcing and heating rates
	Rupakheti D.; Kang S.; Rupakheti M.
发表日期	2020
ISSN	1352-2310
卷号	236
英文摘要	The Indo-Gangetic Plain (IGP) suffers from recurrent heavy air pollution during the dry season of each year. The AERONET station established in Lumbini, a semi-urban site and historically significant location as the birthplace of Buddha in the northern edge of the central IGP in Nepal, captured two events of heavy air pollution: 29–30 October (Event-I) and 1–2 December (Event-II) of 2014. Daily aerosol optical depth (AOD) was found to be 2.66, 2.44, 2.09 and 2.15 respectively with Ångström exponent (AE) > 1 during both events. The daily AOD during two events was 3.26–4.43 times higher than average AOD observed during the monitoring period 2013-2014. Based on various aerosol parameters we concluded that the fine-mode aerosols sourced from biomass-burning and urban/industrial activities were responsible for the haze events. Aerosol absorbed 205-240 Wm-2 of the solar radiation in the atmosphere, resulting in aerosol-induced atmospheric heating rate of 5.76–7.28 K day−1 during the hazy days. Back-trajectory analysis of air masses reaching Lumbini showed that the air masses either originated or travelled over the regions with open fires both prior and during the events. In addition to this, meteorological conditions (e.g. prevailing winds) also played role in initiation/persistence of the haze events. © 2020 Elsevier Ltd
关键词	AERONET Aerosol optical properties Haze events Lumbini Radiative forcing
语种	英语
scopus关键词	Air pollution; Atmospheric radiation; Heating rate; Urban growth; Aerosol optical depths; Aerosol parameters; Aerosol radiative forcing; Atmospheric heating rate; Back trajectory analysis; Indo-Gangetic Plains; Meteorological condition; Significant locations; Aerosols; AERONET; aerosol; air mass; atmospheric pollution; biomass burning; dry season; haze; heating; pollution monitoring; radiative forcing; aerosol; air pollution; Article; atmosphere; biomass; combustion; fire; haze; heating; industry; meteorology; Nepal; optical depth; priority journal; radiative forcing; solar radiation; urban area; wind; Gangetic Plain; Lumbini; Nepal
来源期刊	ATMOSPHERIC ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249076
作者单位	State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China; Institute for Advanced Sustainability Studies, Potsdam, Germany
推荐引用方式 GB/T 7714	Rupakheti D.,Kang S.,Rupakheti M.. Two heavy haze events over Lumbini in southern Nepal: Enhanced aerosol radiative forcing and heating rates[J]. 中国科学院西北生态环境资源研究院,2020,236.
APA	Rupakheti D.,Kang S.,&Rupakheti M..(2020).Two heavy haze events over Lumbini in southern Nepal: Enhanced aerosol radiative forcing and heating rates.ATMOSPHERIC ENVIRONMENT,236.
MLA	Rupakheti D.,et al."Two heavy haze events over Lumbini in southern Nepal: Enhanced aerosol radiative forcing and heating rates".ATMOSPHERIC ENVIRONMENT 236(2020).