Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD029400 |
Recent Trends in Stratospheric Chlorine From Very Short-Lived Substances | |
Hossaini, Ryan1; 39;Doherty, Simon2 | |
2019-02-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:4页码:2318-2335 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA; Canada; Australia; Switzerland; Italy; Norway |
英文摘要 | Very short-lived substances (VSLS), including dichloromethane (CH2Cl2), chloroform (CHCl3), perchloroethylene (C2Cl4), and 1,2-dichloroethane (C2H4Cl2), are a stratospheric chlorine source and therefore contribute to ozone depletion. We quantify stratospheric chlorine trends from these VSLS (VSLCltot) using a chemical transport model and atmospheric measurements, including novel high-altitude aircraft data from the NASA VIRGAS (2015) and POSIDON (2016) missions. We estimate VSLCltot increased from 69 (14) parts per trillion (ppt) Cl in 2000 to 111 (22)ppt Cl in 2017, with >80% delivered to the stratosphere through source gas injection, and the remainder from product gases. The modeled evolution of chlorine source gas injection agrees well with historical aircraft data, which corroborate reported surface CH2Cl2 increases since the mid-2000s. The relative contribution of VSLS to total stratospheric chlorine increased from 2% in 2000 to 3.4% in 2017, reflecting both VSLS growth and decreases in long-lived halocarbons. We derive a mean VSLCltot growth rate of 3.8 (0.3)ppt Cl/year between 2004 and 2017, though year-to-year growth rates are variable and were small or negative in the period 2015-2017. Whether this is a transient effect, or longer-term stabilization, requires monitoring. In the upper stratosphere, the modeled rate of HCl decline (2004-2017) is -5.2% per decade with VSLS included, in good agreement to ACE satellite data (-4.8% per decade), and 15% slower than a model simulation without VSLS. Thus, VSLS have offset a portion of stratospheric chlorine reductions since the mid-2000s. Plain Language Summary It is well established that long-lived halogen-containing compounds of anthropogenic origin, such as chlorofluorocarbons, have led to depletion of the stratospheric ozone layer. As production of these compounds is now controlled by the Montreal Protocol, the atmospheric abundance of chlorine/bromine is in decline, and the ozone layer should recover in coming decades. Here we consider the contribution of Very Short-Lived Substances to stratospheric chlorine. These compounds also have anthropogenic sources, though are much less efficient at destroying ozone compared to, for example, most chlorofluorocarbons (per molecule emitted) as they break down more readily close to Earth's surface. Using surface observations and atmospheric model simulations, we show that stratospheric chlorine from short-lived substances has increased since the early 2000s. This increase is also apparent from airborne measurements of their atmospheric abundance over the same period. Using the model in conjunction with satellite estimates of stratospheric chlorine, we show rising levels of short-lived substances may be causing upper stratospheric chlorine to decline at a slower rate relative to what would be expected in their absence. While this offset in the rate of chlorine decline is modest (15%), it is nonnegligible and should be considered in the analysis of stratospheric composition trends. |
英文关键词 | chlorine stratosphere VSLS chloroform dichloromethane ozone |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000461856300024 |
WOS关键词 | CHEMICAL-TRANSPORT MODEL ; IN-SITU MEASUREMENTS ; OZONE RETURN DATES ; ATMOSPHERIC OXIDATION ; ORGANIC BROMINE ; GAS INJECTION ; CHEMISTRY ; EMISSION ; CLIMATE ; DICHLOROMETHANE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33914 |
专题 | 气候变化 |
作者单位 | 1.Univ Lancaster, Lancaster Environm Ctr, Lancaster, England; 2.Univ Miami, RSMAS, Coral Gables, FL 33124 USA; 3.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England; 4.Old Dominion Univ, Dept Chem & Biochem, Norfolk, VA USA; 5.Univ Waterloo, Dept Chem, Waterloo, ON, Canada; 6.Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA; 7.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA; 8.NOAA, Boulder, CO USA; 9.Univ Leeds, NCAS, Leeds, W Yorkshire, England; 10.Univ Leicester, Dept Phys & Astron, Leicester, Leics, England; 11.Univ Leicester, Natl Ctr Earth Observat, Leicester, Leics, England; 12.CSIRO Oceans & Atmosphere, Climate Sci Ctr, Aspendale, Vic, Australia; 13.Empa, Swiss Fed Labs Mat Sci & Technol, Lab Air Pollut & Environm Technol, Dubendorf, Switzerland; 14.Univ Bristol, Sch Chem, Bristol, Avon, England; 15.Univ Urbino, Dept Pure & Appl Sci, Urbino, Italy; 16.Norwegian Inst Air Res, Kjeller, Norway |
推荐引用方式 GB/T 7714 | Hossaini, Ryan,39;Doherty, Simon. Recent Trends in Stratospheric Chlorine From Very Short-Lived Substances[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(4):2318-2335. |
APA | Hossaini, Ryan,&39;Doherty, Simon.(2019).Recent Trends in Stratospheric Chlorine From Very Short-Lived Substances.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(4),2318-2335. |
MLA | Hossaini, Ryan,et al."Recent Trends in Stratospheric Chlorine From Very Short-Lived Substances".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.4(2019):2318-2335. |
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