Airborne measurements of organic bromine compounds in the Pacific tropical tropopause layer

Very short-lived brominated substances (VSLBr) are an important source of stratospheric bromine, an effective ozone destruction catalyst. However, the accurate estimation of the organic and inorganic partitioning of bromine and the input to the stratosphere remains uncertain. Here, we report near-tropopause measurements of organic brominated substances found over the tropical Pacific during the NASA Airborne Tropical Tropopause Experiment campaigns. We combine aircraft observations and a chemistry-climate model to quantify the total bromine loading injected to the stratosphere. Surprisingly, despite differences in vertical transport between the Eastern and Western Pacific, VSLBr (organic + inorganic) contribute approximately similar amounts of bromine [∼6 (4-9) parts per thousand] to the stratospheric input at the tropical tropopause. These levels of bromine cause substantial ozone depletion in the lower stratosphere, and any increases in future abundances (e.g., as a result of aquaculture) will lead to larger depletions.

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Copyright 2015 Author(s). Published under license by the National Academy of Sciences.


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Author Navarro, Maria
Atlas, Elliot
Saiz-Lopez, Alfonso
Rodriguez-Lloveras, Xavier
Kinnison, Douglas
Lamarque, Jean-Francois
Tilmes, Simone
Filus, Michal
Harris, Neil
Meneguz, Elena
Ashfold, Matthew
Manning, Alistair
Cuevas, Carlos
Schauffler, Sue
Donets, Valeria
Publisher UCAR/NCAR - Library
Publication Date 2015-11-10T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:04:10.087426
Metadata Record Identifier edu.ucar.opensky::articles:17742
Metadata Language eng; USA
Suggested Citation Navarro, Maria, Atlas, Elliot, Saiz-Lopez, Alfonso, Rodriguez-Lloveras, Xavier, Kinnison, Douglas, Lamarque, Jean-Francois, Tilmes, Simone, Filus, Michal, Harris, Neil, Meneguz, Elena, Ashfold, Matthew, Manning, Alistair, Cuevas, Carlos, Schauffler, Sue, Donets, Valeria. (2015). Airborne measurements of organic bromine compounds in the Pacific tropical tropopause layer. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7tq630b. Accessed 08 February 2025.

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