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  Air mass classification during the INDOEX R/V Ronald Brown cruise using measurements of nonmethane hydrocarbons, CH4, CO2, CO, 14CO, and δ18O(CO)

Mühle, J., Zahn, A., Brenninkmeijer, C. A. M., Gros, V., & Crutzen, P. J. (2002). Air mass classification during the INDOEX R/V Ronald Brown cruise using measurements of nonmethane hydrocarbons, CH4, CO2, CO, 14CO, and δ18O(CO). Journal of Geophysical Research, 107(D19): 8021. doi:10.1029/2001JD000730.

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Genre: Journal Article
Alternative Title : J. Geophys. Res.

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 Creators:
Mühle, J.1, Author           
Zahn, A.1, Author           
Brenninkmeijer, C. A. M.1, Author           
Gros, V.1, Author           
Crutzen, P. J.1, Author           
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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Free keywords: INDOEX; Indian Ocean; NMHC; isotopes; air mass classification; long-range transport
 Abstract: [1] During the Indian Ocean Experiment (INDOEX) in February- March 1999 the impact of continental outflow to the Indian Ocean was analyzed. On board the R/V Ronald Brown altogether 93 air samples were taken for analysis of nonmethane hydrocarbons (NMHC), methane (CH4), carbon dioxide (CO2), carbon monoxide (CO), and the C-14/C-12 and O-18/O-16 isotope ratios of CO. Five types of air masses differing in origin, degree of pollution, and chemical age were identified based on back trajectory analyses and the trace gas data, supported by continuous CO and ozone (O-3) observations from other investigators. The Indian Ocean was found to be frequently affected by nearby emissions from the Indian subcontinent and Indochina, but the strongest pollution event (characterized inter alia by high mixing ratios of medium- and long-lived NMHC) was due to long-range advection from the extratropical northern hemisphere. Carbon monoxide 14 showing a distinct meridional profile unequivocally confirms this remote impact. The ratio acetylene/CO was found to be often inadequate as a measure for atmospheric processing, the integrated influence of OH chemistry and mixing. Our data suggest that the influence from fresh continental pollution was less pronounced along the INDOEX R/V Ronald Brown cruise compared to observations made during other tropical campaigns, such as the Pacific Exploratory Mission-West B in the Pacific Ocean.

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18237
ISI: 000180428300015
DOI: 10.1029/2001JD000730
 Degree: -

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Title: Journal of Geophysical Research
  Alternative Title : J. Geophys. Res.
Source Genre: Journal
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Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (D19) Sequence Number: 8021 Start / End Page: - Identifier: ISSN: 0747-7309