In situ observations of stratospheric HCl using three-mirror integrated cavity output spectroscopy
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Published:2021-05-19
Issue:5
Volume:14
Page:3597-3613
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Wilkerson Jordan, Sayres David S., Smith Jessica B., Allen NortonORCID, Rivero Marco, Greenberg Mike, Martin Terry, Anderson James G.
Abstract
Abstract. Stratospheric HCl observations are an important
diagnostic for the evaluation of catalytic processes that impact the ozone
layer. We report here in situ balloon-borne observations of HCl employing an
off-axis integrated cavity output spectrometer (OA-ICOS) fitted with a
reinjection mirror. Laboratory assessments demonstrated that the
spectrometer has a 90 % response time of 10 s to changes in HCl and a 30 s precision of 26 pptv. The instrument was deployed alongside an ozone
instrument in August 2018 on a balloon-borne descent between 20–80 hPa
(29–18 km altitude). The observations agreed with nearby satellite
measurements made by the Earth Observing System Microwave Limb Sounder
within 10 % on average. This is the first time that stratospheric
measurements of HCl have been made with ICOS and the first time any cavity-enhanced HCl instrument has been tested in flight.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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