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Observational Evide...
Observational Evidence of Large Contribution from Primary Sources for Carbon Monoxide in the South Asian Outflow
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- Dasari, Sanjeev, 1989- (author)
- Stockholms universitet,Institutionen för miljövetenskap
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- Andersson, August (author)
- Stockholms universitet,Institutionen för miljövetenskap
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Popa, Maria E. (author)
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Röckmann, Thomas (author)
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- Holmstrand, Henry (author)
- Stockholms universitet,Institutionen för miljövetenskap
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- Budhavant, Krishnakant (author)
- Stockholms universitet,Institutionen för miljövetenskap,Maldives Meteorological Services, Republic of the Maldives; Indian Institute of Sciences (IISC), India
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- Gustafsson, Örjan (author)
- Stockholms universitet,Institutionen för miljövetenskap
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(creator_code:org_t)
- 2021-12-16
- 2022
- English.
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In: Environmental Science and Technology. - : American Chemical Society (ACS). - 0013-936X .- 1520-5851. ; 56:1, s. 165-174
- Related links:
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https://doi.org/10.1...
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https://pubs.acs.org...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- South Asian air is among the most polluted in the world, causing premature death of millions and asserting a strong perturbation of the regional climate. A central component is carbon monoxide (CO), which is a key modulator of the oxidizing capacity of the atmosphere and a potent indirect greenhouse gas. While CO concentrations are declining elsewhere, South Asia exhibits an increasing trend for unresolved reasons. In this paper, we use dual-isotope (δ13C and δ18O) fingerprinting of CO intercepted in the South Asian outflow to constrain the relative contributions from primary and secondary CO sources. Results show that combustion-derived primary sources dominate the wintertime continental CO fingerprint (fprimary ∼ 79 ± 4%), significantly higher than the global estimate (fprimary ∼ 55 ± 5%). Satellite-based inventory estimates match isotope-constrained fprimary-CO, suggesting observational convergence in source characterization and a prospect for model–observation reconciliation. This “ground-truthing” emphasizes the pressing need to mitigate incomplete combustion activities for climate/air quality benefits in South Asia.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- air pollution
- incomplete combustion
- atmospheric chemistry
- isotopes
- source apportionment
- model−observation reconciliation
- Atmospheric Sciences and Oceanography
- atmosfärvetenskap och oceanografi
Publication and Content Type
- ref (subject category)
- art (subject category)
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