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  Chemical characterization of submicron aerosol particles collected over the Indian Ocean

Gabriel, R., Mayol-Bracero, O. L., & Andreae, M. O. (2002). Chemical characterization of submicron aerosol particles collected over the Indian Ocean. Journal of Geophysical Research, 107(D19): 8005. doi:10.1029/2000JD000034.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-90C8-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-90C9-2
Genre: Journal Article
Alternative Title : J. Geophys. Res.

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 Creators:
Gabriel, R.1, Author              
Mayol-Bracero, O. L.1, Author              
Andreae, M. O.1, Author              
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, escidoc:1826286              

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Free keywords: aerosol; ions; black carbon; organic carbon; Indian Ocean; Marine Boundary Layer
 Abstract: Submicron aerosol particles (Dp<1 μm) were sampled with stacked filter units on the National Center for Atmospheric Research (NCAR) Hercules C-130 aircraft during February-March 1999 as a contribution to the Indian Ocean Experiment (INDOEX). We determined the vertical and spatial distribution of the major aerosol components (NH4+, Na+, K+, Mg2+, Ca2+, methyl sulfonic acid, Cl-, NO3-, SO42-, oxalate, organic carbon, and black carbon) over the Indian Ocean to examine the role of pollution aerosols on indirect and direct radiative forcing. High pollution levels were observed over the entire northern Indian Ocean down to the Intertropical Convergence Zone (ITCZ) located between the equator and 10degreesS. In the northern part of the Indian Ocean (5-15degreesN, 66degrees-73degreesE), high concentrations of carbonaceous aerosol and pollution- derived inorganic species were found in a layer extending from the sea surface to about 3.5 km asl. In this layer, the average mass concentration of all aerosol species detected by our technique ranged between 7 and 34 mug m(-3), comparable to pollution levels observed in industrialized regions. In the Southern Hemisphere (1degrees-9degreesS, 66degrees-73degreesE), the aerosol concentrations rapidly declined to remote background levels of about 2 mug m(-3). The concentrations of non-sea-salt sulfate (the main light scattering component) ranged from maximum values of 12.7 mug m(-3) in the Northern Hemisphere to 0.2 mug m(-3) in the Southern Hemisphere. Carbonaceous aerosol contributes between 40% and 60% to the fine aerosol mass of all determined components. An unusually high fraction of black carbon (up to 16% in the polluted areas) is responsible for its high light absorption coefficient.

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Language(s): eng - English
 Dates: 2002-08-17
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 18177
ISI: 000180372700003
DOI: 10.1029/2000JD000034
 Degree: -

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Title: Journal of Geophysical Research
  Alternative Title : J. Geophys. Res.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (D19) Sequence Number: 8005 Start / End Page: - Identifier: ISSN: 0747-7309