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Media type:
E-Article
Title:
Reactive bromine in the low troposphere of Antarctica: estimations at two research sites
Contributor:
Prados-Roman, Cristina;
Gómez-Martín, Laura;
Puentedura, Olga;
Navarro-Comas, Mónica;
Iglesias, Javier;
de Mingo, José Ramón;
Pérez, Manuel;
Ochoa, Héctor;
Barlasina, María Elena;
Carbajal, Gerardo;
Yela, Margarita
imprint:
Copernicus GmbH, 2018
Published in:Atmospheric Chemistry and Physics
Language:
English
DOI:
10.5194/acp-18-8549-2018
ISSN:
1680-7324
Origination:
Footnote:
Description:
<jats:p>Abstract. For decades, reactive halogen species (RHSs) have been the subject of detailed
scientific research due to their influence on the oxidizing capacity of the
atmosphere and on the climate. From the RHSs, those containing bromine are of
particular interest in the polar troposphere as a result of their link to
ozone-depletion events (ODEs) and to the perturbation of the cycle of toxic mercury, for example. Given its remoteness and related limited accessibility
compared to the Arctic region, the RHSs in the Antarctic troposphere are still
poorly characterized. This work presents ground-based observations of
tropospheric BrO from two different Antarctic locations: Marambio Base
(64∘13′ S, 56∘37′ W) and Belgrano II Base
(77∘52′ S, 34∘7′ W) during the sunlit
period of 2015. By means of MAX-DOAS (Multi-axis Differential Optical
Absorption Spectroscopy) measurements of BrO performed from the two research
sites, the seasonal variation in this reactive trace gas is described along
with its vertical and geographical distribution in the Antarctic environment.
Results show an overall vertical profile of BrO mixing ratio decreasing with
altitude, with a median value of 1.6 pmol mol−1 in the lowest layers
of the troposphere. Additionally, observations show that the polar sunrise
triggers a geographical heterogeneous increase in bromine content in the
Antarctic troposphere yielding a maximum BrO at Marambio (26 pmol mol−1), amounting to 3-fold the values observed at Belgrano at dawn.
Data presented herein are combined with previous studies and ancillary data
to update and expand our knowledge of the geographical and vertical
distribution of BrO in the Antarctic troposphere, revealing Marambio as one
of the locations with the highest BrO reported so far in Antarctica. Furthermore,
the observations gathered during 2015 serve as a proxy to investigate the
budget of reactive bromine (BrOx = Br + BrO) and the
bromine-mediated ozone loss rate in the Antarctic troposphere.
</jats:p>