Abstract
We measured carbonaceous material and water‐soluble ionic species in the fine fraction (Dp < 1.3 μm) of aerosol samples collected on NCAR's C‐130 aircraft during the intensive field phase (February–March 1999) of the Indian Ocean Experiment (INDOEX). Polluted layers were present over most of the study region north of the equator at altitudes up to 3.2 km. The estimated aerosol mass (sum of carbonaceous and soluble ionic aerosol components) of fine‐mode particles in these layers was 15.3 ± 7.9 μg m−3. The major components were particulate organic matter (POM, 35%), SO42− (34%), black carbon (BC, 14%), and NH4+ (11%). The main difference between the composition of the marine boundary layer (MBL, 0 to ∼1.2 km), and the overlying residual continental boundary layer (1.2 to ∼3.2 km) was a higher abundance of SO42− relative to POM in the MBL, probably due to a faster conversion of SO2 into SO42− in the MBL. Our results show that carbon is a major, and sometimes dominant, contributor to the aerosol mass and that its contribution increases with altitude. Low variability was observed in the optical properties of the aerosol in the two layers. Regression analysis of the absorption coefficient at 565 nm on BC mass (BC < 4.0 μg C m−3) yielded a specific absorption cross section of 8.1 ± 0.7 m2 g−1 for the whole period. The unusually high fraction of BC and the good correlation between the absorption coefficient and BC suggest that BC was responsible for the strong light absorption observed for the polluted layers during INDOEX. High correlation between BC and total carbon (TC) (r2 = 0.86) suggest that TC is predominantly of primary origin. Good correlations were also found between the scattering coefficient at 550 nm and the estimated aerosol mass for the fine fraction. These yielded a specific scattering cross section of 4.9 ± 0.4 m2 g−1. The observed BC/TC, BC/OC, SO42−/BC, and K+/BC ratios were fairly constant throughout the period. These ratios suggest that between 60 and 80% of the aerosol in the polluted layers during INDOEX originated from fossil fuel and between 20 and 40% from biofuel combustion.
Bibliography
MayolâBracero, O. L., Gabriel, R., Andreae, M. O., Kirchstetter, T. W., Novakov, T., Ogren, J., Sheridan, P., & Streets, D. G. (2002). Carbonaceous aerosols over the Indian Ocean during the Indian Ocean Experiment (INDOEX): Chemical characterization, optical properties, and probable sources. Journal of Geophysical Research: Atmospheres, 107(D19). Portico.
References
94
Referenced
146
10.1126/science.288.5468.1042
10.1126/science.220.4602.1148
10.1029/2000GB001382
10.1029/JD093iD02p01509
10.1029/98JD02280
10.1034/j.1600-0889.2000.00105.x
10.1029/2001JD900252
10.1175/1520-0426(2001)018<1387:AEOTCA>2.0.CO;2
10.1016/0004-6981(89)90093-0
10.1080/027868299304435
{'key': 'e_1_2_6_12_1', 'first-page': '79', 'article-title': 'Direct climate forcing by anthropogenic aerosols: Quantifying the link between atmospheric sulfate and radiation', 'volume': '72', 'author': 'Charlson R. J.', 'year': '1999', 'journal-title': 'Contrib. Atmos. Phys.'}
/ Contrib. Atmos. Phys. / Direct climate forcing by anthropogenic aerosols: Quantifying the link between atmospheric sulfate and radiation by Charlson R. J. (1999)10.1029/96JD01221
10.1016/0960-1686(93)90245-T
10.1029/2001JD000572
10.1029/1999JD900187
10.1080/02786829008959331
10.1126/science.250.4988.1669
10.1029/2001JD000501
- Dod R. L. H.Rosen andT.Novakov Optico‐thermal analysis of the carbonaceous fraction of aerosol particles Rep. LBL‐8696 Lawrence Berkeley Lab. Berkeley Calif. 1979.
- R. J. Downing R. Ramankutty J. J. Shah 1997 The World Bank Washington D.C.
- Draxler R. R. andG. D.Hess Hybrid single‐particle Langrangian integrated trajectories (HY‐SPLIT): Version 4 User's guide and model description NOAATech. Memo ERL ARL‐224 1997.
10.1016/0960-1686(93)90247-V
10.1029/98JD00692
10.1029/2000JD900556
10.1029/2000JD000034
10.1080/10473289.2000.10464186
10.1021/es991320p
10.1016/0004-6981(81)90063-9
10.1016/0048-9697(84)90266-3
10.1029/1999RG000078
10.1029/93JD01615
10.1029/97JD02293
10.1029/1999JD901173
10.1029/1999GL900156
10.1016/0960-1686(93)90104-7
{'key': 'e_1_2_6_37_1', 'volume-title': 'Climate Change 1995: The Science of Climate Change', 'author': 'Intergovernmental Panel on Climate Change (IPCC)', 'year': '1996'}
/ Climate Change 1995: The Science of Climate Change by Intergovernmental Panel on Climate Change (IPCC) (1996)10.1029/1999GL010968
10.1016/0004-6981(83)90054-9
10.1034/j.1600-0889.2000.00057.x
10.1016/1352-2310(94)00356-P
10.1016/S1352-2310(98)00313-6
10.1029/2000JD900381
10.1016/S1352-2310(00)00448-9
10.1021/es981276y
10.1016/S1352-2310(98)00328-8
10.1126/science.1057103
10.1364/AO.32.006077
10.1016/0960-1686(93)90246-U
10.1038/346552a0
10.1016/1352-2310(94)90050-7
10.1029/96JD00552
{'key': 'e_1_2_6_53_1', 'volume-title': 'in Trends: A Compendium of Data on Global Change', 'author': 'Marland G.', 'year': '1999'}
/ in Trends: A Compendium of Data on Global Change by Marland G. (1999)10.1016/0960-1686(90)90134-9
10.1016/S0021-8502(98)00027-5
10.1126/science.282.5394.1664
{'key': 'e_1_2_6_57_1', 'volume-title': 'Aerosol Radiative Forcing and Climate Change', 'author': 'National Research Council (NRC)', 'year': '1996'}
/ Aerosol Radiative Forcing and Climate Change by National Research Council (NRC) (1996)10.1038/365823a0
10.1029/97JD01487
10.1029/97JD02793
10.1034/j.1600-0889.2000.00019.x
10.1029/2000GL011759
10.1007/BF00547184
10.1007/s003820050259
10.1034/j.1600-0889.2000.d01-4.x
10.1034/j.1600-0889.2000.00033.x
10.1029/2001JD900133
10.1029/2000JD900508
10.1016/S1352-2310(00)00105-9
10.1016/S1352-2310(01)00463-0
{'key': 'e_1_2_6_71_1', 'first-page': '697', 'article-title': 'Inventory of aerosol and sulphur dioxide emissions from India, II, Biomass combustion', 'volume': '36', 'author': 'Reddy M. S.', 'year': '2002', 'journal-title': 'Atmos. Environ.'}
/ Atmos. Environ. / Inventory of aerosol and sulphur dioxide emissions from India, II, Biomass combustion by Reddy M. S. (2002)10.1029/2000JD900695
10.1029/95JD01077
10.1016/0960-1686(93)90257-Y
10.1364/AO.17.003859
10.1029/1999JD900804
- L. G. Salmon L. M. Hildemann M. Mazurek C. Christoforou N. A. Frei P. A. Solomon J. Schauer L. Hughes R. Johnson 1998 California Institute of Technology Pasadena Calif.
10.1029/1999JD900478
10.1038/35011039
10.1016/S1352-2310(00)00493-3
10.1016/0004-6981(84)90249-X
- Shah J. J. andJ. A.Rau Carbonaceous species methods comparison study: Interlaboratory round robin interpretation of results Final report Contract No. A832‐154 Calif. Air Resour. Board Sacramento Calif. 1990.
10.1029/2000JD000166
10.1029/91JD03139
10.1016/S0360-5442(98)00033-4
10.1016/S1352-2310(00)00175-8
10.1016/S1352-2310(01)00179-0
10.1080/02786820119445
10.1016/1352-2310(94)00133-6
- USEPA Supplement B to compilation of air pollutant emission factors Volume I Stationary point and area sources Tech. Rep. Office of Air Quality Planning and Standards Research Triangle Park N.C. 1996.
10.1016/S1352-2310(98)00140-X
10.1029/2001JD900203
10.1016/0004-6981(81)90224-9
{'key': 'e_1_2_6_94_1', 'volume-title': 'in Acid Deposition, State of Science and Technology, NAPAP Rep.24, 85‐102', 'author': 'White W. H.', 'year': '1990'}
/ in Acid Deposition, State of Science and Technology, NAPAP Rep.24, 85‐102 by White W. H. (1990)10.1016/S1352-2310(98)00362-8
Dates
Type | When |
---|---|
Created | 21 years, 10 months ago (Oct. 24, 2003, 8:04 p.m.) |
Deposited | 1 year, 10 months ago (Oct. 16, 2023, 5:48 p.m.) |
Indexed | 4 months, 1 week ago (April 17, 2025, 4:45 p.m.) |
Issued | 22 years, 10 months ago (Oct. 11, 2002) |
Published | 22 years, 10 months ago (Oct. 11, 2002) |
Published Online | 22 years, 10 months ago (Oct. 11, 2002) |
Published Print | 22 years, 10 months ago (Oct. 16, 2002) |
@article{Mayol_Bracero_2002, title={Carbonaceous aerosols over the Indian Ocean during the Indian Ocean Experiment (INDOEX): Chemical characterization, optical properties, and probable sources}, volume={107}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/2000jd000039}, DOI={10.1029/2000jd000039}, number={D19}, journal={Journal of Geophysical Research: Atmospheres}, publisher={American Geophysical Union (AGU)}, author={Mayol‐Bracero, O. L. and Gabriel, R. and Andreae, M. O. and Kirchstetter, T. W. and Novakov, T. and Ogren, J. and Sheridan, P. and Streets, D. G.}, year={2002}, month=oct }