Airborne Observations of BrO and HOBr by Chemical Ionization Mass Spectrometry (CIMS) during CONTRAST (CONvective TRansport of Active Species in the Tropics)
Dexian Chen1, L Gregory Huey1, David Tanner1, Rainer M Volkamer2, Theodore Konstantinos Koenig3, Sunil Baidar4, Barbara Dix4, Ross J Salawitch5, Julie M Nicely6, Daniel C Anderson7, Laura Pan8, Douglas Edward Kinnison9, J F Lamarque10, Alfonso Saiz-Lopez11, Eric C Apel12, Nicola J Blake13, Alan J Hills14, Rebecca S Hornbrook14, Daniel D Riemer15, Andrew John Weinheimer16, Denise Montzka14, Elliot L Atlas17, Sue Schauffler10, Richard Lueb15, Samuel R Hall18, Kirk Ullmann18, Teresa Lynn Campos14, Frank M Flocke14, Glenn Wolfe19, Thomas F Hanisco19 and Team of CONvective TRansport of Active Species in the Tropics (CONTRAST 2014), (1)Georgia Institute of Technology, Atlanta, GA, United States, (2)University of Colorado at Boulder, Cooperative Institute for Research in Environmental Sciences (CIRES) and Department of Chemistry, Boulder, United States, (3)University of Colorado Boulder, Chemistry & CIRES, Boulder, CO, United States, (4)University of Colorado at Boulder, Boulder, CO, United States, (5)University of Maryland College Park, Department of Chemistry and Biochemistry, College Park, MD, United States, (6)University of Maryland, College Park, United States, (7)University of Maryland, College Park, MD, United States, (8)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling, Boulder, United States, (9)National Center for Atmospheric Research (NCAR), Atmospheric Chemistry Observations & Modeling Laboratory (ACOM), Boulder,CO, United States, (10)National Center for Atmospheric Research, Boulder, CO, United States, (11)Spanish National Research Council, Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera (CSIC), Madrid, Spain, (12)National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling, Boulder, United States, (13)University of California Irvine, Irvine, CA, United States, (14)National Center for Atmospheric Research, Atmospheric Chemistry Observations & Modeling Laboratory, Boulder, United States, (15)University of Miami, Miami, FL, United States, (16)National Center for Atmospheric Research, Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, United States, (17)University of Miami, Miami, United States, (18)National Center for Atmospheric Research (NCAR), Atmospheric Chemistry Observations and Modeling Laboratory, Boulder, United States, (19)NASA Goddard Space Flight Center, Greenbelt, MD, United States
Abstract:
Inorganic bromine species such as BrO play important roles in the photochemistry of both the troposphere and stratosphere. A primary goal of the CONTRAST campaign was to determine the budget of inorganic bromine in the tropical tropopause. In order to address this issue BrO and HOBr were measured by CIMS on a series of research flights out of Guam. Here we will present our initial observations and compare them to both photochemical and chemical transport models. Preliminary results indicate very low levels of BrO (generally <0.5ppt) in the upper troposphere unless significant mixing ratios of ozone (>70ppbv) were present. The origin(s) of elevated BrO (>1pptv) will be discussed and comparison of CIMS measurements to preliminary DOAS (Differential Optical Absorption Spectroscopy) data will also be presented.
