Article ; Online: Black carbon over tropical Indian coast during the COVID-19 lockdown: inconspicuous role of coastal meteorology.
Environmental science and pollution research international
2023 Volume 30, Issue 15, Page(s) 44773–44781
Abstract: Black carbon (BC) aerosols critically impact the climate and hydrological cycle. The impact of anthropogenic emissions and coastal meteorology on BC dynamics, however, remains unclear over tropical India, a globally identified hotspot. In this regard, we ...
| Abstract | Black carbon (BC) aerosols critically impact the climate and hydrological cycle. The impact of anthropogenic emissions and coastal meteorology on BC dynamics, however, remains unclear over tropical India, a globally identified hotspot. In this regard, we have performed in situ measurements of BC over a megacity (Chennai, 12° 59' 26.5″ N, 80° 13' 51.8″ E) on the eastern coast of India during January-June 2020, comprising the period of COVID-19-induced strict lockdown. Our measurements revealed an unprecedented reduction in BC concentration by an order of magnitude as reported by other studies for various other pollutants. This was despite having stronger precipitation during pre-lockdown and lesser precipitation washout during the lockdown. Our analyses, taking mesoscale dynamics into account, unravels stronger BC depletion in the continental air than marine air. Additionally, the BC source regime also shifted from a fossil-fuel dominance to a biomass burning dominance as a result of lockdown, indicating relative reduction in fossil fuel combustion. Considering the rarity of such a low concentration of BC in a tropical megacity environment, our observations and findings under near-natural or background levels of BC may be invaluable to validate model simulations dealing with BC dynamics and its climatic impacts in the Anthropocene. |
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| MeSH term(s) | Humans ; Air Pollutants/analysis ; COVID-19 ; Meteorology ; India ; Communicable Disease Control ; Respiratory Aerosols and Droplets ; Fossil Fuels/analysis ; Carbon/analysis ; Environmental Monitoring |
| Chemical Substances | Air Pollutants ; Fossil Fuels ; Carbon (7440-44-0) |
| Language | English |
| Publishing date | 2023-01-26 |
| Publishing country | Germany |
| Document type | Journal Article |
| ZDB-ID | 1178791-0 |
| ISSN | 1614-7499 ; 0944-1344 |
| ISSN (online) | 1614-7499 |
| ISSN | 0944-1344 |
| DOI | 10.1007/s11356-023-25370-5 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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