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- W3042911447 endingPage "1758" @default.
- W3042911447 startingPage "1743" @default.
- W3042911447 abstract "The near UV-visible light-absorbing organic carbon (OC) of ambient aerosols, referred to here as brown carbon (BrC), significantly influences the atmospheric radiative forcing on both regional and global scales. Here, we documented BrC absorption in the aqueous and methanol extracts of marine aerosols collected over the Bay of Bengal (BoB: September-October 2017) and a city, Visakhapatnam (May-June 2018), in southern India during the southwest monsoon (i.e., a transition period with weak continental impact). The absorption spectra of BrC over the BoB showed several peaks around 300-400 nm and differ from those observed over Visakhapatnam. The absorption coefficient of BrC over the BoB, unlike Visakhapatnam data, does not seem to covary with other chemical proxies of biomass burning (non-sea-salt or nss-K+) and coal combustion (nss-SO42-) in the continental outflows, suggesting a different source of BrC over the BoB. Besides, we observed higher proportions of water-insoluble organic carbon (WIOC/OC: 0.89 ± 0.02) and significant enrichment of Mg2+ over Na+ (i.e., relative to seawater) in BoB aerosols. This result and the backward air mass trajectories both hinted their major source of OC from marine-derived organic matter. In contrast, the absorption spectra of BrC over Visakhapatnam are like those from biomass burning emissions in the Indo-Gangetic Plain. This observation is further supported by the satellite-based fire counts and backward air mass trajectories. Therefore, our study underscores the BrC aerosols from the oceanic sources and southern India, hitherto unknown, and can improve our understanding of the regional climate effects of carbonaceous aerosols if included in models." @default.
- W3042911447 created "2020-07-23" @default.
- W3042911447 creator A5004248297 @default.
- W3042911447 creator A5008949708 @default.
- W3042911447 creator A5011950094 @default.
- W3042911447 creator A5016001350 @default.
- W3042911447 creator A5021555258 @default.
- W3042911447 creator A5043002879 @default.
- W3042911447 date "2020-01-01" @default.
- W3042911447 modified "2023-10-01" @default.
- W3042911447 title "Evidence for brown carbon absorption over the Bay of Bengal during the southwest monsoon season: a possible oceanic source" @default.
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