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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) ExperimentA 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 (Br(sub y)). Based on this profile, we estimated the product gas injection of bromine species into the stratosphere to be 2 pptv. Analysis of Br(sub y) 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.
Document ID
20170003584
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chen, Dexian (Georgia Tech Savannah, GA, United States)
Huey, L. Gregory (Georgia Tech Savannah, GA, United States)
Tanner, David J. (Georgia Tech Savannah, GA, United States)
Salawitch, Ross J. (Maryland Univ. College Park, MD, United States)
Anderson, Daniel C. (Maryland Univ. College Park, MD, United States)
Wales, Pamela A. (Maryland Univ. College Park, MD, United States)
Pan, Laura L. (National Center for Atmospheric Research Boulder, CO, United States)
Atlas, Elliot L. (Miami Univ. Coral Gables, FL, United States)
Hornbrook, Rebecca S. (National Center for Atmospheric Research Boulder, CO, United States)
Apel, Eric C. (National Center for Atmospheric Research Boulder, CO, United States)
Hanisco, Thomas F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nicely, Julie M. (Maryland Univ. College Park, MD, United States)
Wolfe, Glenn M. (Maryland Univ. Baltimore, MD, United States)
Date Acquired
April 17, 2017
Publication Date
October 27, 2016
Publication Information
Publication: Journal of Geophysical Research: Atmospheres
Volume: 121
Issue: 20
ISSN: 2169-897X
Subject Category
Chemistry and Materials (General)
Geophysics
Report/Patent Number
GSFC-E-DAA-TN41637
Funding Number(s)
CONTRACT_GRANT: NSF 1261657
CONTRACT_GRANT: NNX15AT34A
CONTRACT_GRANT: NNH15CO48B
CONTRACT_GRANT: NSF 1262033
CONTRACT_GRANT: NSF AGS 1261689
Distribution Limits
Public
Copyright
Other
Keywords
Isolated episodes of elevated BrO