气候变化领域集成服务门户(CCPortal): Near-Global CFC-11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018

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DOI	10.1029/2020JD033051
	Near-Global CFC-11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018
	Chen X.; Huang X.; Strow L.L.
发表日期	2020
ISSN	2169897X
卷号	125 期号:22
英文摘要	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. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185644
作者单位	Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, United States; Department of Physics, University of Maryland at Baltimore County, Baltimore, MD, United States
推荐引用方式 GB/T 7714	Chen X.,Huang X.,Strow L.L.. Near-Global CFC-11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018[J],2020,125(22).
APA	Chen X.,Huang X.,&Strow L.L..(2020).Near-Global CFC-11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018.Journal of Geophysical Research: Atmospheres,125(22).
MLA	Chen X.,et al."Near-Global CFC-11 Trends as Observed by Atmospheric Infrared Sounder From 2003 to 2018".Journal of Geophysical Research: Atmospheres 125.22(2020).