Journal article

Bromoform in the tropical boundary layer of the Maritime Continent during OP3

Pyle J, Ashfold M, Harris N, Robinson A, Warwick N, Carver G, Gostlow B, O'Brien L, Manning A, Phang S, Yong S, Leong K, Ung E, Ong S ...see all

Atmospheric Chemistry and Physics, vol. 11, issue 2 (2011) pp. 529-542

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We report measurements of bromoform made by gas chromatography during the OP3 campaign in 2008. Mea- surements were made simultaneously for a few days at the World Meteorological Organization (WMO) Global Atmo- sphericWatch (GAW) site in the Danum Valley, a rainforest location in Sabah, Borneo, and at a nearby coastal site at Ku- nak. Background values at Kunak were higher than those measured in the rainforest (2–5 ppt compared with 1 ppt) and excursions away from the background were very much higher, reaching 10 s of ppt. Measurements of C2Cl4, an industrial tracer, showed no significant difference in back- ground at the two sites. Modelling using two different mod- els can reproduce a number of the observed features. The data are consistent with a strong, local coastal source of bro- moform in eastern Sabah and can be used to infer the strength of the source of bromoform in South East Asia. However, they provide only a very weak constraint on global emis- sions. The global model results highlight the difficulty for short-lived species of extrapolating limited duration, local measurements to a global source.

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  • J. A. Pyle

  • M. J. Ashfold

  • N. R P Harris

  • A. D. Robinson

  • N. J. Warwick

  • G. D. Carver

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