ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-529-2011 Bromoform in the tropical boundary layer of the Maritime Continent during OP3 Pyle J. A. 1 2 Ashfold M. J. 1 Harris N. R. P. 1 Robinson A. D. 1 Warwick N. J. 1 2 Carver G. D. 1 2 Gostlow B. 1 O'Brien L. M. 1 Manning A. J. 3 Phang S. M. 4 Yong S. E. 5 Leong K. P. 5 Ung E. H. 6 Ong S. 6 Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK National Centre for Atmospheric Science, NCAS, UK Met Office, Exeter, UK Institute of Ocean and Earth Science, University of Malaya, 50603 Kuala Lumpur, Malaysia Malaysian Meteorological Department, Ketua Stesen GAW Lembah Danum, Jabatan Meteorologi Malaysia Cawangan Sabah, Lapangan Terbang Wakuba Tawau, Peti Surat 60109, 91011 Tawau, Sabah, Malaysia Global Satria Life Sciences Lab, TB 12188, Taman Megajaya Phase 3, 91000 Tawau, Sabah, Malaysia 18 01 2011 11 2 529 542 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/529/2011/acp-11-529-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/529/2011/acp-11-529-2011.pdf

We report measurements of bromoform made by gas chromatography during the OP3 campaign in 2008. Measurements were made simultaneously for a few days at the World Meteorological Organization (WMO) Global Atmospheric Watch (GAW) site in the Danum Valley, a rainforest location in Sabah, Borneo, and at a nearby coastal site at Kunak. 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 C<sub>2</sub>Cl<sub>4</sub>, an industrial tracer, showed no significant difference in background at the two sites. Modelling using two different models can reproduce a number of the observed features. The data are consistent with a strong, local coastal source of bromoform 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 emissions. 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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