Airborne measurements of BrO and the sum of HOBr and Br2 over the Tropical West Pacific from 1 to 15 km during the CONvective TRansport of Active Species in the Tropics (CONTRAST) experiment

Dexian Chen, L. Gregory Huey, David J. Tanner, Ross J. Salawitch, Daniel C. Anderson, Pamela A. Wales, Laura L. Pan, Elliot L Atlas, Rebecca S. Hornbrook, Eric C. Apel, Nicola J. Blake, Teresa L. Campos, Valeria Donets, Frank M. Flocke, Samuel R. Hall, Thomas F. Hanisco, Alan J. Hills, Shawn B. Honomichl, Jørgen B. Jensen, Lisa KaserDenise D. Montzka, Julie M. Nicely, J. Michael Reeves, Daniel D. Riemer, Sue M. Schauffler, Kirk Ullmann, Andrew J. Weinheimer, Glenn M. Wolfe

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

A chemical ionization mass spectrometer was used to measure BrO and HOBr + Br2 over the Tropical West Pacific Ocean within the altitude range of 1 to 15 km, during the CONvective TRansport of Active Species in the Tropics (CONTRAST) campaign in 2014. Isolated episodes of elevated BrO (up to 6.6 pptv) and/or HOBr + Br2 (up to 7.3 pptv) were observed in the tropical free troposphere (TFT) and were associated with biomass burning. However, most of the time we did not observe significant BrO or HOBr + Br2 in the TFT and the tropical tropopause layer (TTL) above our limits of detection (LOD). The 1 min average LOD for BrO ranged from 0.6 to 1.6 pptv and for HOBr + Br2 ranged from 1.3 to 3.5 pptv. During one flight, BrO observations from the TTL to the extratropical lowermost stratosphere were used to infer a profile of inorganic bromine (Bry). Based on this profile, we estimated the product gas injection of bromine species into the stratosphere to be 2 pptv. Analysis of Bry partitioning further indicates that BrO levels are likely very low in the TFT environment and that future studies should target the measurement of HBr or atomic Br.

Original languageEnglish (US)
Pages (from-to)12,560-12,578
JournalJournal of Geophysical Research C: Oceans
Volume121
Issue number20
DOIs
StatePublished - Oct 27 2016

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Keywords

  • bromine oxide
  • CONTRAST
  • hydrobromic acid
  • hypobromous acid
  • product gas injection

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Ecology
  • Aquatic Science
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Chen, D., Huey, L. G., Tanner, D. J., Salawitch, R. J., Anderson, D. C., Wales, P. A., Pan, L. L., Atlas, E. L., Hornbrook, R. S., Apel, E. C., Blake, N. J., Campos, T. L., Donets, V., Flocke, F. M., Hall, S. R., Hanisco, T. F., Hills, A. J., Honomichl, S. B., Jensen, J. B., ... Wolfe, G. M. (2016). Airborne measurements of BrO and the sum of HOBr and Br2 over the Tropical West Pacific from 1 to 15 km during the CONvective TRansport of Active Species in the Tropics (CONTRAST) experiment. Journal of Geophysical Research C: Oceans, 121(20), 12,560-12,578. https://doi.org/10.1002/2016JD025561