气候变化领域集成服务门户(CCPortal): Seasonal distribution and drivers of surface fine particulate matter and organic aerosol over the Indo-Gangetic Plain

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DOI	10.5194/acp-21-10881-2021
	Seasonal distribution and drivers of surface fine particulate matter and organic aerosol over the Indo-Gangetic Plain
	Mogno C.; Palmer P.I.; Knote C.; Yao F.; Wallington T.J.
发表日期	2021
ISSN	1680-7316
起始页码	10881
结束页码	10909
卷号	21 期号:14
英文摘要	The Indo-Gangetic Plain (IGP) is home to 9g% of the global population and is responsible for a large fraction of agricultural crop production in Pakistan, India, and Bangladesh. Levels of fine particulate matter (mean diameterg<2.5gμm, PM2.5) across the IGP often exceed human health recommendations, making cities across the IGP among the most polluted in the world. Seasonal changes in the physical environment over the IGP are dominated by the large-scale south Asian monsoon system that dictates the timing of agricultural planting and harvesting. We use the WRF-Chem model to study the seasonal anthropogenic, pyrogenic, and biogenic influences on fine particulate matter and its constituent organic aerosol (OA) over the IGP that straddles Pakistan, India, and Bangladesh during 2017-2018. We find that surface air quality during pre-monsoon (March-May) and monsoon (June-September) seasons is better than during post-monsoon (October-December) and winter (January-February) seasons, but all seasonal mean values of PM2.5 still exceed the recommended levels, so that air pollution is a year-round problem. Anthropogenic emissions influence the magnitude and distribution of PM2.5 and OA throughout the year, especially over urban sites, while pyrogenic emissions result in localised contributions over the central and upper parts of IGP in all non-monsoonal seasons, with the highest impact during post-monsoon seasons that correspond to the post-harvest season in the agricultural calendar. Biogenic emissions play an important role in the magnitude and distribution of PM2.5 and OA during the monsoon season, and they show a substantial contribution to secondary OA (SOA), particularly over the lower IGP. We find that the OA contribution to PM2.5 is significant in all four seasons (17g%-30g%), with primary OA generally representing the larger fractional contribution. We find that the volatility distribution of SOA is driven mainly by the mean total OA loading and the washout of aerosols and gas-phase aerosol precursors that result in SOA being less volatile during the pre-monsoon and monsoon season than during the post-monsoon and winter seasons. © 2021 Caterina Mogno et al.
语种	英语
scopus关键词	aerosol composition; aerosol formation; carbon emission; monsoon; particulate matter; seasonal variation; Bangladesh; India; Pakistan
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246720
作者单位	School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; National Centre for Earth Observation, University of Edinburgh, Edinburgh, United Kingdom; Model-Based Environmental Exposure Science (MBEES), Faculty of Medicine, University of Augsburg, Augsburg, Germany; Research and Advanced Engineering, Ford Motor Company, Dearborn, MI 48121-2053, United States
推荐引用方式 GB/T 7714	Mogno C.,Palmer P.I.,Knote C.,et al. Seasonal distribution and drivers of surface fine particulate matter and organic aerosol over the Indo-Gangetic Plain[J],2021,21(14).
APA	Mogno C.,Palmer P.I.,Knote C.,Yao F.,&Wallington T.J..(2021).Seasonal distribution and drivers of surface fine particulate matter and organic aerosol over the Indo-Gangetic Plain.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(14).
MLA	Mogno C.,et al."Seasonal distribution and drivers of surface fine particulate matter and organic aerosol over the Indo-Gangetic Plain".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.14(2021).