Black carbon aerosols over Indian Ocean have unique source fingerprint and optical characteristics during monsoon season

被引:7
作者
Budhavant, Krishnakant [1 ,2 ]
Andersson, August [3 ]
Holmstrand, H. [3 ]
Satheesh, S. K. [2 ]
Gustafsson, Orjan [3 ]
机构
[1] Maldives Meteorol Serv, Maldives Climate Observ Hanimaadhoo, Hanimaadhoo 02020, Maldives
[2] Indian Inst Sci, Divecha Ctr Climate Change, Bangalore 560012, India
[3] Stockholm Univ, Bolin Ctr Climate Res, Dept Environm Sci, S-10691 Stockholm, Sweden
基金
瑞典研究理事会;
关键词
air pollution; black carbon; long-range transport; Asian aerosol; SOURCE APPORTIONMENT; LIGHT-ABSORPTION; REUNION ISLAND; ORGANIC-CARBON; RADIOCARBON; PARTICLES; EVENTS; ASIA; CH4; CO;
D O I
10.1073/pnas.2210005120
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Effects of aerosols such as black carbon (BC) on climate and buildup of the monsoon over the Indian Ocean are insufficiently quantified. Uncertain contributions from various natural and anthropogenic sources impede our understanding. Here, we use observations over 5 y of BC and its isotopes at a remote island observatory in northern Indian Ocean to constrain loadings and sources during little-studied monsoon season. Carbon-14 data show a highly variable yet largely fossil (65 +/- 15%) source mixture. Combining carbon-14 with carbon-13 reveals the impact of African savanna burning, which occa-sionally approach 50% (48 +/- 9%) of the total BC loadings. The BC mass-absorption cross-section for this regime is 7.6 +/- 2.6 m2/g, with higher values during savanna fire input. Taken together, the combustion sources, longevity, and optical properties of BC aerosols over summertime Indian Ocean are different than the more-studied winter aerosol, with implications for chemical transport and climate model simulations of the Indian monsoon.
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页数:7
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