Source-diagnostic dual-isotope composition and optical properties of water-soluble organic carbon and elemental carbon in the South Asian outflow intercepted over the Indian Ocean

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Fältnamn	Indikatorer	Metadata
000		04029naa a2200469 4500
001		oai:DiVA.org:su-111938
003		SwePub
008		150108s2014 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1119382 URI
024	7	a https://doi.org/10.1002/2014JD0221272 DOI
040		a (SwePub)su
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Bosch, Carmeu Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)4 aut0 (Swepub:su)cbosc
245	1 0	a Source-diagnostic dual-isotope composition and optical properties of water-soluble organic carbon and elemental carbon in the South Asian outflow intercepted over the Indian Ocean
264	1	c 2014
338		a print2 rdacarrier
500		a AuthorCount:10;
520		a The dual carbon isotope signatures and optical properties of carbonaceous aerosols have been investigated simultaneously for the first time in the South Asian outflow during an intensive campaign at the Maldives Climate Observatory on Hanimaadhoo (MCOH) (February and March 2012). As one component of the Cloud Aerosol Radiative Forcing Dynamics Experiment, this paper reports on the sources and the atmospheric processing of elemental carbon (EC) and water-soluble organic carbon (WSOC) as examined by a dual carbon isotope approach. The radiocarbon (C-14) data show that WSOC has a significantly higher biomass/biogenic contribution (865%) compared to EC (594%). The more C-13-enriched signature of MCOH-WSOC (-20.80.7) compared to MCOH-EC (-25.8 +/- 0.3 parts per thousand) and megacity Delhi WSOC (-24.1 +/- 0.9 parts per thousand) suggests that WSOC is significantly more affected by aging during long-range transport than EC. The C-13-C-14 signal suggests that the wintertime WSOC intercepted over the Indian Ocean largely represents aged primary biomass burning aerosols. Since light-absorbing organic carbon aerosols (Brown Carbon (BrC)) have recently been identified as potential contributors to positive radiative forcing, optical properties of WSOC were also investigated. The mass absorption cross section of WSOC (MAC(365)) was 0.5 +/- 0.2 m(2)g(-1) which is lower than what has been observed at near-source sites, indicating a net decrease of WSOC light-absorption character during long-range transport. Near-surface WSOC at MCOH accounted for similar to 1% of the total direct solar absorbance relative to EC, which is lower than the BrC absorption inferred from solar spectral observations of ambient aerosols, suggesting that a significant portion of BrC might be included in the water-insoluble portion of organic aerosols.
650	7	a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe
650	7	a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng
653		a radiocarbon
653		a brown carbon
653		a source apportionment
653		a stable carbon
653		a black carbon
653		a MAC
700	1	a Andersson, Augustu Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)4 aut0 (Swepub:su)auand
700	1	a Kirillova, Elena N.u Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)4 aut
700	1	a Budhavant, Krishnakant4 aut
700	1	a Tiwari, Suresh4 aut
700	1	a Praveen, P. S.4 aut
700	1	a Russell, Lynn M.4 aut
700	1	a Beres, Nicholas D.4 aut
700	1	a Ramanathan, Veerabhadran4 aut
700	1	a Gustafsson, Örjanu Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)4 aut0 (Swepub:su)ogust
710	2	a Stockholms universitetb Institutionen för tillämpad miljövetenskap (ITM)4 org
773	0	t Journal of Geophysical Research - Atmospheresg 119:20, s. 11743-11759q 119:20<11743-11759x 2169-897Xx 2169-8996
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-111938
856	4 8	u https://doi.org/10.1002/2014JD022127

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Av författaren/redakt...: Bosch, Carme; Andersson, Augus ...; Kirillova, Elena ...; Budhavant, Krish ...; Tiwari, Suresh; Praveen, P. S.; visa fler...; Russell, Lynn M.; Beres, Nicholas ...; Ramanathan, Veer ...; Gustafsson, Örja ...; visa färre...

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