Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS
The hydroxyl (OH) and hydroperoxyl (HO₂) radicals, collectively called HOx, play central roles in tropospheric chemistry. Accurate measurements of OH and HO₂ are critical to examine our understanding of atmospheric chemistry. Intercomparisons of different techniques for detecting OH and HO₂ are vita...
Published in: | Atmospheric Measurement Techniques |
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Copernicus Publications
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ftncar:oai:drupal-site.org:articles_12243 2023-09-05T13:17:47+02:00 Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS Ren, X. (author) Mao, J. (author) Brune, W. (author) Cantrell, Chris (author) Mauldin, Roy (author) Hornbrook, Rebecca (author) Kosciuch, Edward (author) Olson, J. (author) Crawford, J. (author) Chen, G. (author) Singh, H. (author) 2012-08-21 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-236 https://doi.org/10.5194/amt-5-2025-2012 en eng Copernicus Publications Atmospheric Measurement Techniques http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-236 doi:10.5194/amt-5-2025-2012 ark:/85065/d7ws8tzn Copyright Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. Text article 2012 ftncar https://doi.org/10.5194/amt-5-2025-2012 2023-08-14T18:40:33Z The hydroxyl (OH) and hydroperoxyl (HO₂) radicals, collectively called HOx, play central roles in tropospheric chemistry. Accurate measurements of OH and HO₂ are critical to examine our understanding of atmospheric chemistry. Intercomparisons of different techniques for detecting OH and HO₂ are vital to evaluate their measurement capabilities. Three instruments that measured OH and/or HO₂ radicals were deployed on the NASA DC-8 aircraft throughout Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) in the spring and summer of 2008. One instrument was the Penn State Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) for OH and HO₂ measurements based on Laser-Induced Fluorescence (LIF) spectroscopy. A second instrument was the NCAR Selected-Ion Chemical Ionization Mass Spectrometer (SI-CIMS) for OH measurement. A third instrument was the NCAR Peroxy Radical Chemical Ionization Mass Spectrometer (PeRCIMS) for HO₂ measurement. Formal intercomparison of LIF and CIMS was conducted for the first time on a same aircraft platform. The three instruments were calibrated by quantitative photolysis of water vapor by ultraviolet (UV) light at 184.9 nm with three different calibration systems. The absolute accuracies were ±32% (2σ) for the LIF instrument, ±65% (2σ) for the SI-CIMS instrument, and ±50% (2σ) for the PeRCIMS instrument. In general, good agreement was obtained between the CIMS and LIF measurements of both OH and HO₂ measurements. Linear regression of the entire data set yields [OH]CIMS = 0.89 × [OH]LIF + 2.8 × 104 cm⁻³ with a correlation coefficient r² = 0.72 for OH, and [HO₂]CIMS = 0.86 × [HO₂]LIF + 3.9 parts per trillion by volume (pptv, equivalent to pmol mol⁻¹) with a correlation coefficient r² = 0.72 for HO₂. In general, the difference between CIMS and LIF instruments for OH and HO₂ measurements can be explained by their combined measurement uncertainties. Comparison with box model results shows some similarities for both the CIMS and LIF measurements. First, the ... Article in Journal/Newspaper Arctic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Arctic Atmospheric Measurement Techniques 5 8 2025 2037 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
The hydroxyl (OH) and hydroperoxyl (HO₂) radicals, collectively called HOx, play central roles in tropospheric chemistry. Accurate measurements of OH and HO₂ are critical to examine our understanding of atmospheric chemistry. Intercomparisons of different techniques for detecting OH and HO₂ are vital to evaluate their measurement capabilities. Three instruments that measured OH and/or HO₂ radicals were deployed on the NASA DC-8 aircraft throughout Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) in the spring and summer of 2008. One instrument was the Penn State Airborne Tropospheric Hydrogen Oxides Sensor (ATHOS) for OH and HO₂ measurements based on Laser-Induced Fluorescence (LIF) spectroscopy. A second instrument was the NCAR Selected-Ion Chemical Ionization Mass Spectrometer (SI-CIMS) for OH measurement. A third instrument was the NCAR Peroxy Radical Chemical Ionization Mass Spectrometer (PeRCIMS) for HO₂ measurement. Formal intercomparison of LIF and CIMS was conducted for the first time on a same aircraft platform. The three instruments were calibrated by quantitative photolysis of water vapor by ultraviolet (UV) light at 184.9 nm with three different calibration systems. The absolute accuracies were ±32% (2σ) for the LIF instrument, ±65% (2σ) for the SI-CIMS instrument, and ±50% (2σ) for the PeRCIMS instrument. In general, good agreement was obtained between the CIMS and LIF measurements of both OH and HO₂ measurements. Linear regression of the entire data set yields [OH]CIMS = 0.89 × [OH]LIF + 2.8 × 104 cm⁻³ with a correlation coefficient r² = 0.72 for OH, and [HO₂]CIMS = 0.86 × [HO₂]LIF + 3.9 parts per trillion by volume (pptv, equivalent to pmol mol⁻¹) with a correlation coefficient r² = 0.72 for HO₂. In general, the difference between CIMS and LIF instruments for OH and HO₂ measurements can be explained by their combined measurement uncertainties. Comparison with box model results shows some similarities for both the CIMS and LIF measurements. First, the ... |
author2 |
Ren, X. (author) Mao, J. (author) Brune, W. (author) Cantrell, Chris (author) Mauldin, Roy (author) Hornbrook, Rebecca (author) Kosciuch, Edward (author) Olson, J. (author) Crawford, J. (author) Chen, G. (author) Singh, H. (author) |
format |
Article in Journal/Newspaper |
title |
Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS |
spellingShingle |
Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS |
title_short |
Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS |
title_full |
Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS |
title_fullStr |
Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS |
title_full_unstemmed |
Airborne intercomparison of HOx measurements using laser-induced fluorescence and chemical ionization mass spectrometry during ARCTAS |
title_sort |
airborne intercomparison of hox measurements using laser-induced fluorescence and chemical ionization mass spectrometry during arctas |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-236 https://doi.org/10.5194/amt-5-2025-2012 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Atmospheric Measurement Techniques http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-011-236 doi:10.5194/amt-5-2025-2012 ark:/85065/d7ws8tzn |
op_rights |
Copyright Author(s) 2012. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_doi |
https://doi.org/10.5194/amt-5-2025-2012 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
5 |
container_issue |
8 |
container_start_page |
2025 |
op_container_end_page |
2037 |
_version_ |
1776198825594060800 |