the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
HYPHOP: a tool for high-altitude, long-range monitoring of hydrogen peroxide and higher organic peroxides in the atmosphere
Zaneta Hamryszczak
Antonia Hartmann
Dirk Dienhart
Sascha Hafermann
Bettina Brendel
Rainer Königstedt
Uwe Parchatka
Jos Lelieveld
Horst Fischer
Abstract. Measurements of hydroperoxides help improve the understanding of atmospheric oxidation processes. We introduce an instrumental setup designed for airborne hydroperoxide measurements. The instrument has been deployed on the German High-Altitude and Long-range Observatory (HALO) aircraft. The HYdrogen Peroxide and Higher Organic Peroxides (HYPHOP) monitor based on dual-enzyme fluorescence spectroscopy enables measurements up to ambient pressure of approximately 150 hPa pressure altitude (13.5–14 km). The main goal of this work is the characterization of the measurement method and data acquisition with special emphasis on potential interferences impacting instrumental uncertainty. Physically driven interferences were examined based on a dedicated test flight to investigate potential measurement inconsistencies arising from the dynamic movement patterns of the aircraft. During the test flight, the hydroperoxide monitor was operated in the background air sampling mode with purified air by scrubbing atmospheric trace gases, to investigate the instrumental stability and potential parameters that might affect the measurements. We show that technical and physical challenges during flight maneuvers do not critically impact the instrumental performance and the absolute measurements of hydroperoxide levels. Dynamic processes such as convective transport in the South Atlantic Convergence Zone (SACZ) are well-resolved as shown in the overview of a recent measurement campaign, Chemistry of the Atmosphere Field Experiment in Brazil in December 2022–January 2023 (CAFE-Brazil). The instrument precision based on the measurement results during CAFE-Brazil for hydrogen peroxide and the sum of organic hydroperoxides is estimated to be 6.4 % (at 5.7 ppbv) and 3.6 % (at 5.8 ppbv), respectively, and the corresponding detection limits 20 pptv and 19 pptv for a data acquisition frequency of 1 Hz, subsequently integrated over 120 second time intervals.
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Zaneta Hamryszczak et al.
Status: closed
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RC1: 'Comment on amt-2023-114', Anonymous Referee #1, 03 Jul 2023
Review comments for: HYPHOP: a tool for high-altitude, long-range monitoring of hydrogen peroxide and higher organic peroxides in the atmosphere
Hamryszczak et al. detail the performance of the HYPHOP instrument for airborne hydroperoxide measurements. The instrument has already been used in a number of field experiments and a full description in the literature is warranted. This manuscript is a thorough description of the instrument and its performance. Multiple sources of measurement uncertainty are characterized including chemical interference, dynamic flight patterns, cabin temperature, and line pressure changes. I recommend publication after attention to tho following minor comments.
Comments:
The introduction/manuscript is lacking information about the performance of other airborne hydroperoxide measurement techniques. How does HYPHOP performance compare to the best available alternatives?
The HYPHOP background measurements are important for the calibration, but there is no mention of how often these measurements are taken during a typical flight (other than "frequent measurements") or how the background is interpolated.
The performance of this instrument is evaluated in pristine air – a statement on any projected interfering variables in unclean air (ex. urban air, wildfires) would be beneficial.
Citation: https://doi.org/10.5194/amt-2023-114-RC1 - AC1: 'Reply on RC1', Zaneta Hamryszczak, 22 Aug 2023
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RC2: 'Comment on amt-2023-114', Anonymous Referee #2, 26 Jul 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-114/amt-2023-114-RC2-supplement.pdf
- AC2: 'Reply on RC2', Zaneta Hamryszczak, 22 Aug 2023
Status: closed
-
RC1: 'Comment on amt-2023-114', Anonymous Referee #1, 03 Jul 2023
Review comments for: HYPHOP: a tool for high-altitude, long-range monitoring of hydrogen peroxide and higher organic peroxides in the atmosphere
Hamryszczak et al. detail the performance of the HYPHOP instrument for airborne hydroperoxide measurements. The instrument has already been used in a number of field experiments and a full description in the literature is warranted. This manuscript is a thorough description of the instrument and its performance. Multiple sources of measurement uncertainty are characterized including chemical interference, dynamic flight patterns, cabin temperature, and line pressure changes. I recommend publication after attention to tho following minor comments.
Comments:
The introduction/manuscript is lacking information about the performance of other airborne hydroperoxide measurement techniques. How does HYPHOP performance compare to the best available alternatives?
The HYPHOP background measurements are important for the calibration, but there is no mention of how often these measurements are taken during a typical flight (other than "frequent measurements") or how the background is interpolated.
The performance of this instrument is evaluated in pristine air – a statement on any projected interfering variables in unclean air (ex. urban air, wildfires) would be beneficial.
Citation: https://doi.org/10.5194/amt-2023-114-RC1 - AC1: 'Reply on RC1', Zaneta Hamryszczak, 22 Aug 2023
-
RC2: 'Comment on amt-2023-114', Anonymous Referee #2, 26 Jul 2023
The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2023-114/amt-2023-114-RC2-supplement.pdf
- AC2: 'Reply on RC2', Zaneta Hamryszczak, 22 Aug 2023
Zaneta Hamryszczak et al.
Zaneta Hamryszczak et al.
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