印度洋-恒河平原东部上空气溶胶吸湿性增长导致冬季雾霾扩大

IF 8.1 1区 地球科学 Q1 ENVIRONMENTAL SCIENCES Communications Earth & Environment Pub Date : 2024-11-04 DOI:10.1038/s43247-024-01792-y
Thejas Kallihosur, Vijayakumar S. Nair, P. R. Sinha
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引用次数: 0

摘要

印度北部经常出现大范围的冬季雾霾,其主要原因似乎是人为排放的细颗粒物浓度过高。然而,人们对印度北部冬季雾霾的根本原因还不甚了解。这项研究利用 2006 年至 2021 年的卫星和再分析数据的协同作用,评估了气溶胶光学深度的吸湿增长在印度-甘肃平原东部冬季烟雾中的作用。开发了一种从环境气溶胶光学深度中提取干气溶胶光学深度的方法,以阐明冬季灰霾的起源。在环境湿度条件下,约有 31% 的严重雾霾事件(气溶胶光学深度为 0.85)在干燥条件下降至 5% 以下,这表明颗粒吸湿性增长起着关键作用。与地表和大气中的变化相比,吸湿增长导致的大气顶部辐射强迫变化相对较小,表明大气变暖加剧。在高人为气溶胶排放条件下,吸湿性增长加剧了印度洋-甘肃平原东部无处不在的冬季雾霾,而气溶胶-辐射反馈又进一步加剧了雾霾。这些结果对于设计雾霾预报、实施有效的减缓政策以及在气候模型中体现气溶胶吸湿性都很有价值。根据对 2006 至 2021 年期间卫星和再分析数据的分析,人为气溶胶排放通过气溶胶-辐射反馈和颗粒吸湿性增长加剧了印度洋-长江平原东部的冬季灰霾。
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Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain
Frequent occurrences of widespread winter haze over Northern India largely appear to originate from exceedingly high concentrations of fine particulate matter from anthropogenic emissions. However, the underlying mechanisms driving winter haze in Northern India are not well understood. This study employed a synergy of satellite and reanalysis data from 2006 to 2021 to assess the role of hygroscopic growth of aerosol optical depth in winter haze over the eastern Indo-Gangetic Plain. A method has been developed to extract dry aerosol optical depth from ambient aerosol optical depth to elucidate the origin of winter haze. About 31% of severe haze episodes (aerosol optical depth > 0.85) occurring under ambient humidity conditions decrease to below 5% for dry conditions, indicating the critical role of particle hygroscopic growth. The change in radiative forcing at the top of the atmosphere due to hygroscopic growth is relatively small compared to that at the surface and in the atmosphere, indicating enhanced atmospheric warming. The ubiquitous winter haze over the eastern Indo-Gangetic Plain is exacerbated by hygroscopic growth under high anthropogenic aerosol emissions, further aggravated through aerosol-radiation feedback. These results will be valuable in devising haze forecasts, implementing effective mitigation policies, and representing aerosol hygroscopicity in climate models. Anthropogenic aerosol emissions aggravate winter haze over the eastern Indo-Gangetic Plain by aerosol-radiation feedback and particle hygroscopic growth, according to an analysis of satellite and reanalysis data between 2006 and 2021.
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来源期刊
Communications Earth & Environment
Communications Earth & Environment Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
8.60
自引率
2.50%
发文量
269
审稿时长
26 weeks
期刊介绍: Communications Earth & Environment is an open access journal from Nature Portfolio publishing high-quality research, reviews and commentary in all areas of the Earth, environmental and planetary sciences. Research papers published by the journal represent significant advances that bring new insight to a specialized area in Earth science, planetary science or environmental science. Communications Earth & Environment has a 2-year impact factor of 7.9 (2022 Journal Citation Reports®). Articles published in the journal in 2022 were downloaded 1,412,858 times. Median time from submission to the first editorial decision is 8 days.
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