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

by J. A. Pyle, M. J. Ashfold, N. R P Harris, A. D. Robinson, N. J. Warwick, G. D. Carver, B. Gostlow, L. M. O'Brien, A. J. Manning, S. M. Phang, S. E. Yong, K. P. Leong, E. H. Ung, S. Ong show all authors
Atmospheric Chemistry and Physics ()
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Abstract

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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Authors on Mendeley

  1. Glenn Carver
    Researcher (at an Academic Institution)
    European Centre for Medium-Range Weather Forecast (ECMWF)

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