In situ measurements of BrO in the Arctic stratosphere

D. W. Toohey, J. G. Anderson, William Henry Brune, K. R. Chan

Research output: Contribution to journalArticle

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Abstract

Mixing ratios of BrO have been measured in the arctic lower stratosphere with an instrument mounted on the NASA ER‐2 aircraft. Observations from fourteen flights above the Arctic Circle in January and February of 1989 defined mixing ratios within the vortex of 4±2 parts per trillion by volume (pptv) at a potential temperature of 400 K, rising to 8±2 pptv at 470 K. These values are twice as large as values found at equivalent potential temperatures at lower latitudes, and are comparable to the mixing ratios found inside the antarctic polar vortex. Within the statistical uncertainty of the measurements, no BrO was observed in darkness at any time either inside or outside of the vortex, indicating that active bromine was sequestered in long‐lived reservoirs, probably BrONO2 and BrCl. These measurements, in conjunction with measurements of ClO, demonstrate that the interaction of bromine and chlorine could represent a major sink for ozone in the presence of sunlight.

Original languageEnglish (US)
Pages (from-to)513-516
Number of pages4
JournalGeophysical Research Letters
Volume17
Issue number4
DOIs
StatePublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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