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ToolsKolonjari, Felicia, Sheese, Patrick E., Walker, Kaley A., Boone, Chris D., Plummer, David A., Engel, Andreas, Montzka, Stephen A., Oram, David E., Schuck, Tanja, Stiller, Gabriele P. and Toon, Geoffrey C. (2024) Validation of Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) chlorodifluoromethane (HCFC-22) in the upper troposphere and lower stratosphere. Atmospheric Measurement Techniques, 17 (8). pp. 2429-2449. ISSN 1867-1381
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Abstract
The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) is currently providing the only measurements of vertically resolved chlorodifluoromethane (HCFC-22) from space. This study assesses the ACE-FTS HCFC-22 v5.2 product in the upper troposphere and lower stratosphere, as well as simulations of HCFC-22 from a 39-year specified dynamics run of the Canadian Middle Atmosphere Model (CMAM39) in the same region. In general, ACE-FTS HCFC-22 observations tend to agree with subsampled CMAM39 data to within ±5%, except for between 15 and 25km in the extratropical regions where ACE-FTS exhibits a negative bias of 5%-30% and near 6km in the tropics where ACE-FTS exhibits a bias of -15%. When comparing against correlative satellite, aircraft, and balloon data, ACE-FTS typically exhibits a low bias on the order of 0%-10% between 1/45 and 15km and is within ±15% between 1/415 and 25km. ACE-FTS, CMAM39, and surface flask measurements from the NOAA Global Monitoring Laboratory's surface air-sampling network all exhibit consistent tropospheric HCFC-22 trends ranging between 6.8 and 7.8pptyr-1 (within 95% confidence) for 2004-2012 and between 3.1 and 4.7pptyr-1 (within 95% confidence) for 2012-2018. Interhemispheric differences (IHDs) of HCFC-22 were also derived using ACE-FTS, NOAA, and CMAM39 data, and all three yielded consistent and correlated (r≥0.42) IHD time series, with the results indicating that surface IHD values decreased at a rate of 2.2±1.1ppt per decade between 2004 and 2018.
| Item Type: | Article |
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| Additional Information: | Data availability statement: The ACE-FTS level 2 v3.6, v4.1/v.2, and v5.2 data can be obtained via the ACE database (registration required), https://databace.scisat.ca/level2/ (ACE-FTS, 2022). The ACE-FTS data quality flags used for filtering the v5.2 data set can be accessed at https://doi.org/10.5683/SP3/NAYNFE (Sheese and Walker, 2023b). The ACE-FTS data quality flags used for filtering the v4.1/4.2 data set can be accessed at https://doi.org/10.5683/SP2/BC4ATC (Sheese and Walker, 2023a). CMAM39-SD data were obtained from ftp://crd-data-donnees-rdc.ec.gc.ca/pub/CCCMA/dplummer/CMAM39-SD_6hr (CMAM39, 2023). NOAA/GML data were obtained from https://gml.noaa.gov/hats/gases/HCFC22.html (NOAA/GML, 2023). MIPAS V8 data can be downloaded after registration from https://www.imk-asf.kit.edu/english/308.php (MIPAS, 2024). Funding Information: This research has been supported by the Canadian Space Agency (grant no. 9SCIGRA-09 and contract no. 9F045-200582/001/SA) and the Natural Sciences and Engineering Research Council of Canada (grant no. RGPIN-2017-06664). |
| Uncontrolled Keywords: | atmospheric science ,/dk/atira/pure/subjectarea/asjc/1900/1902 |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 11 Nov 2024 16:30 |
| Last Modified: | 12 Nov 2024 14:31 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/97616 |
| DOI: | 10.5194/amt-17-2429-2024 |
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