Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain
Abstract 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...
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Nature Portfolio
2024-11-01
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| Series: | Communications Earth & Environment |
| Online Access: | https://doi.org/10.1038/s43247-024-01792-y |
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| author | Thejas Kallihosur Vijayakumar S. Nair P. R. Sinha |
| author_facet | Thejas Kallihosur Vijayakumar S. Nair P. R. Sinha |
| author_sort | Thejas Kallihosur |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-d3fa43f9f0a34c1ea67b39d0c20bb51d |
| institution | DOAJ |
| issn | 2662-4435 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Nature Portfolio |
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| series | Communications Earth & Environment |
| spelling | doaj-art-d3fa43f9f0a34c1ea67b39d0c20bb51d2025-08-20T02:50:08ZengNature PortfolioCommunications Earth & Environment2662-44352024-11-01511910.1038/s43247-024-01792-yWinter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic PlainThejas Kallihosur0Vijayakumar S. Nair1P. R. Sinha2Department of Earth and Space Sciences, Indian Institute of Space Science and TechnologySpace Physics Laboratory, Vikram Sarabhai Space CentreDepartment of Earth and Space Sciences, Indian Institute of Space Science and TechnologyAbstract 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.https://doi.org/10.1038/s43247-024-01792-y |
| spellingShingle | Thejas Kallihosur Vijayakumar S. Nair P. R. Sinha Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain Communications Earth & Environment |
| title | Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain |
| title_full | Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain |
| title_fullStr | Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain |
| title_full_unstemmed | Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain |
| title_short | Winter haze amplification by aerosol hygroscopic growth over eastern Indo- Gangetic Plain |
| title_sort | winter haze amplification by aerosol hygroscopic growth over eastern indo gangetic plain |
| url | https://doi.org/10.1038/s43247-024-01792-y |
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