Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018

Recent studies have indicated a slowdown of the decline of CFC‐11 concentration since 2012. Ground‐based observations used in such studies have their limitations in terms of global coverage. Here we show that the CFC‐11 time‐varying behaviors can be seen by double differencing nadir‐view, clear‐sky...

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Published in:Journal of Geophysical Research: Atmospheres
Main Authors: Chen, Xiuhong, Huang, Xianglei, Strow, L. Larrabee
Format: Article in Journal/Newspaper
Language:unknown
Published: Wiley Periodicals, Inc. 2020
Subjects:
Atmospheric and Oceanic Sciences
Science
Arctic
Online Access:https://hdl.handle.net/2027.42/163636
https://doi.org/10.1029/2020JD033051
id ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/163636
record_format openpolar
institution Open Polar
collection University of Michigan: Deep Blue
op_collection_id ftumdeepblue
language unknown
topic Atmospheric and Oceanic Sciences
Science
spellingShingle Atmospheric and Oceanic Sciences
Science
Chen, Xiuhong
Huang, Xianglei
Strow, L. Larrabee
Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
topic_facet Atmospheric and Oceanic Sciences
Science
description Recent studies have indicated a slowdown of the decline of CFC‐11 concentration since 2012. Ground‐based observations used in such studies have their limitations in terms of global coverage. Here we show that the CFC‐11 time‐varying behaviors can be seen by double differencing nadir‐view, clear‐sky brightness temperatures of four AIRS (Atmospheric Infrared Sounder) channels in an infrared CFC‐11 absorption band. Assuming that CFC‐11 is vertically well mixed through the troposphere, we retrieve CFC‐11 surface concentration and its secular trend using such AIRS observations over the near globe (55°S to 55°N) from January 2003 to December 2018. The retrieved trends of CFC‐11 at the 11 ground sites agree well with the trends derived from in situ measurements at those sites. Our results show that, from 55°S to 55°N, the CFC‐11 trends from January 2003 to December 2012 are all negative, ranging from −2.5 to −1 ppt/year. The trends from January 2003 to December 2018 are less negative by as much as ~0.5–1 ppt/year over the Shandong peninsula, the Arabian Peninsula, and north India and Nepal area, and such differences in the trends are statistically significant. Factors other than the CFC‐11 that can affect the retrievals and trends are also discussed. These findings can help us depict the near‐global spatial distribution of the CFC‐11 trends from 2003 to 2018. The analysis described here has the potential to be used with current and future hyperspectral sounders to help monitor the CFC‐11 from space.Key PointsCFC‐11 long‐term signals can be extracted from the nadir‐viewed infrared sounders such as AIRS using a double differential methodCFC‐11 long‐term trends over each 30° by 10° grid from 55°S to 55°N are estimated from the AIRS clear‐sky radiances from 2003 to 2018The result suggested possible regional slowdowns of the CFC‐11 trend since 2013 Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/163636/2/jgrd56600_am.pdf http://deepblue.lib.umich.edu/bitstream/2027.42/163636/1/jgrd56600.pdf
format Article in Journal/Newspaper
author Chen, Xiuhong
Huang, Xianglei
Strow, L. Larrabee
author_facet Chen, Xiuhong
Huang, Xianglei
Strow, L. Larrabee
author_sort Chen, Xiuhong
title Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
title_short Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
title_full Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
title_fullStr Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
title_full_unstemmed Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
title_sort near‐global cfc‐11 trends as observed by atmospheric infrared sounder from 2003 to 2018
publisher Wiley Periodicals, Inc.
publishDate 2020
url https://hdl.handle.net/2027.42/163636
https://doi.org/10.1029/2020JD033051
genre Arctic
genre_facet Arctic
op_relation Chen, Xiuhong; Huang, Xianglei; Strow, L. Larrabee (2020). "Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018." Journal of Geophysical Research: Atmospheres 125(22): n/a-n/a.
2169-897X
2169-8996
https://hdl.handle.net/2027.42/163636
doi:10.1029/2020JD033051
Journal of Geophysical Research: Atmospheres
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spelling ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/163636 2023-08-20T04:03:13+02:00 Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018 Chen, Xiuhong Huang, Xianglei Strow, L. Larrabee 2020-11-27 application/pdf https://hdl.handle.net/2027.42/163636 https://doi.org/10.1029/2020JD033051 unknown Wiley Periodicals, Inc. Chen, Xiuhong; Huang, Xianglei; Strow, L. Larrabee (2020). "Near‐Global CFC‐11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018." Journal of Geophysical Research: Atmospheres 125(22): n/a-n/a. 2169-897X 2169-8996 https://hdl.handle.net/2027.42/163636 doi:10.1029/2020JD033051 Journal of Geophysical Research: Atmospheres Prinn, R. G., Weiss, R. F., Arduini, J., Arnold, T., DeWitt, H. L., Fraser, P. J., Ganesan, A. L., Gasore, J., Harth, C. M., Hermansen, O., Kim, J., Krummel, P. B., Li, S., Loh, Z. M., Lunder, C. R., Maione, M., Manning, A. J., Miller, B. 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Environmental Science & Technology Letters, 6 ( 3 ), 114 – 118. https://doi.org/10.1021/acs.estlett.9b00022 Loveland, T., Reed, B., Brown, J., Ohlen, D., Zhu, Z., Yang, L., & Merchant, J. ( 2000 ). Development of a global land cover characteristics database and IGBP DISCover from 1 km AVHRR data. International Journal of Remote Sensing, 21 ( 6–7 ), 1303 – 1330. https://doi.org/10.1080/014311600210191 McClatchey, R., Fenn, R., Selby, J., Volz, F., & Garing, J. ( 1972 ). Optical properties of the atmosphere, Tech. Rep. AFCRL‐72‐0497, AFGL (OPI), Hanscom AFB, MA 01731. IndexNoFollow Atmospheric and Oceanic Sciences Science Article 2020 ftumdeepblue https://doi.org/10.1029/2020JD033051 2023-07-31T21:19:28Z Recent studies have indicated a slowdown of the decline of CFC‐11 concentration since 2012. Ground‐based observations used in such studies have their limitations in terms of global coverage. Here we show that the CFC‐11 time‐varying behaviors can be seen by double differencing nadir‐view, clear‐sky brightness temperatures of four AIRS (Atmospheric Infrared Sounder) channels in an infrared CFC‐11 absorption band. Assuming that CFC‐11 is vertically well mixed through the troposphere, we retrieve CFC‐11 surface concentration and its secular trend using such AIRS observations over the near globe (55°S to 55°N) from January 2003 to December 2018. The retrieved trends of CFC‐11 at the 11 ground sites agree well with the trends derived from in situ measurements at those sites. Our results show that, from 55°S to 55°N, the CFC‐11 trends from January 2003 to December 2012 are all negative, ranging from −2.5 to −1 ppt/year. The trends from January 2003 to December 2018 are less negative by as much as ~0.5–1 ppt/year over the Shandong peninsula, the Arabian Peninsula, and north India and Nepal area, and such differences in the trends are statistically significant. Factors other than the CFC‐11 that can affect the retrievals and trends are also discussed. These findings can help us depict the near‐global spatial distribution of the CFC‐11 trends from 2003 to 2018. The analysis described here has the potential to be used with current and future hyperspectral sounders to help monitor the CFC‐11 from space.Key PointsCFC‐11 long‐term signals can be extracted from the nadir‐viewed infrared sounders such as AIRS using a double differential methodCFC‐11 long‐term trends over each 30° by 10° grid from 55°S to 55°N are estimated from the AIRS clear‐sky radiances from 2003 to 2018The result suggested possible regional slowdowns of the CFC‐11 trend since 2013 Peer Reviewed http://deepblue.lib.umich.edu/bitstream/2027.42/163636/2/jgrd56600_am.pdf http://deepblue.lib.umich.edu/bitstream/2027.42/163636/1/jgrd56600.pdf Article in Journal/Newspaper Arctic University of Michigan: Deep Blue Journal of Geophysical Research: Atmospheres 125 22

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