Large latitudinal gradients and temporal heterogeneity in aerosol black carbon and its mass mixing ratio over southern and northern oceans observed during a trans-continental cruise experiment
[1] Extensive, and collocated measurements of the mass concentrations (M B ) of aerosol black carbon (BC) and (M T ) of composite aerosols were made over the Arabian Sea, tropical Indian Ocean and the Southern Ocean during a trans-continental cruise experiment. Our investigations show that M B remai...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1049.4462 http://repository.ias.ac.in/17147/1/340.pdf |
| Summary: | [1] Extensive, and collocated measurements of the mass concentrations (M B ) of aerosol black carbon (BC) and (M T ) of composite aerosols were made over the Arabian Sea, tropical Indian Ocean and the Southern Ocean during a trans-continental cruise experiment. Our investigations show that M B remains extremely low (<50 ng m À3 ) and remarkably steady (in space and time) in the Southern Ocean (20°S to 56°S). In contrast, large latitudinal gradients exist north of $20°S; M B increasing exponentially to reach as high as 2000 ng m À3 in the Arabian Sea ($8°N). Interestingly, the share of BC showed a distinctly different latitudinal variation, with a peak close to the equator and decreasing on either side. Large fluctuations were seen in M T over Southern Ocean associated with enhanced production of sea-salt aerosols in response to sea-surface wind speed. These spatio-temporal changes in M B and its mixing ratio have important implications to regional and global climate. Citation: Moorthy, K. K., S. K. Satheesh, S. S. Babu, and A. Saha (2005), Large latitudinal gradients and temporal heterogeneity in aerosol black carbon and its mass mixing ratio over southern and northern oceans observed during a trans-continental cruise experiment, Geophys. Res. Lett., 32, L14818 |
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