Preprints
https://doi.org/10.5194/egusphere-2023-2912
https://doi.org/10.5194/egusphere-2023-2912
04 Jan 2024
 | 04 Jan 2024
Status: this preprint is open for discussion and under review for Atmospheric Measurement Techniques (AMT).

A novel, balloon-borne UV/visible spectrometer for direct sun measurements of stratospheric bromine

Karolin Voss, Philip Holzbeck, Klaus Pfeilsticker, Ralph Kleinschek, Gerald Wetzel, Blanca Fuentes Andrade, Michael Höpfner, Jörn Ungermann, Björn-Martin Sinnhuber, and André Butz

Abstract. We report on a novel, medium weight (∼ 25 kg) optical spectrometer coupled to an automated sun tracker (∼ 12 kg) for direct sun observations from azimuth controlled balloon platforms. It is designed to measure a suite of UV/vis absorbing gases (O3, NO2, BrO, OClO, HONO and IO) relevant in the context of stratospheric ozone depletion using the DOAS method. Here, we describe the design and major features of the instrument. Further, the instrument’s performance during two stratospheric deployments from Esrange/Kiruna (Sweden) on 21 August 2021 and from Timmins (Ontario, Canada) on 23 August 2022 are discussed along with first results concerning inferred mixing ratios of BrO above balloon float altitude. Using a photochemical correction for the partitioning of stratospheric bromine ([BrO]/[Bry]) obtained by chemical transport simulations, the inferred total stratospheric bromine load [Bry] amounts to (17.5 ± 2.2) ppt (pure statistical error amounts to 1.5 ppt) in (5.5±1.0) yrs old air, resulting in a stratospheric entry early 2017±1 yr, the latter being inferred from simultaneous measurements of N2O by the GLORIA mid-IR instrument.

Karolin Voss, Philip Holzbeck, Klaus Pfeilsticker, Ralph Kleinschek, Gerald Wetzel, Blanca Fuentes Andrade, Michael Höpfner, Jörn Ungermann, Björn-Martin Sinnhuber, and André Butz

Status: open (until 19 Mar 2024)

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  • RC1: 'Comment on egusphere-2023-2912', Anonymous Referee #1, 08 Feb 2024 reply
Karolin Voss, Philip Holzbeck, Klaus Pfeilsticker, Ralph Kleinschek, Gerald Wetzel, Blanca Fuentes Andrade, Michael Höpfner, Jörn Ungermann, Björn-Martin Sinnhuber, and André Butz
Karolin Voss, Philip Holzbeck, Klaus Pfeilsticker, Ralph Kleinschek, Gerald Wetzel, Blanca Fuentes Andrade, Michael Höpfner, Jörn Ungermann, Björn-Martin Sinnhuber, and André Butz

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Short summary
A novel balloon-borne instrument for direct sun and solar occultation measurements of several UV/vis absorbing gases (e.g. O3, NO2, BrO, IO, HONO, ..) is described. Major design features as well as its performance during two stratospheric deployments are discussed. From the measured overhead BrO concentration and a suitable photochemical correction, total stratospheric bromine is inferred to (17.5 ± 2.2) ppt in air masses which entered the stratosphere around early 2017±1 yr.