Atmospheric CH3CCl3 observations in China: Historical trends and implications

Yu, Dajiang; Yao, Bo; Lin, Weili; Vollmer, Martin K.; Ge, Baozhu; Zhang, Gen; Li, Yi; Xu, Hui; O’Doherty, Simon; Chen, Liqu; Reimann, Stefan

doi:10.1016/j.atmosres.2019.104658

Cited by 8 publications

(7 citation statements)

References 40 publications

(56 reference statements)

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“…The recovery rate of SF 6 from the flask samples over 112 days was tested to be between 99.5 and 100.5%, and there were no drifts detected either in test samples or calibration standards. More detailed information about the sampling sites and sampling processes can be found in previous studies 50 – 52 .…”

Section: Methodsmentioning

confidence: 99%

Sustained growth of sulfur hexafluoride emissions in China inferred from atmospheric observations

An,

Prinn,

Western

et al. 2024

Nat Commun

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Sulfur hexafluoride (SF6) is a potent greenhouse gas. Here we use long-term atmospheric observations to determine SF6 emissions from China between 2011 and 2021, which are used to evaluate the Chinese national SF6 emission inventory and to better understand the global SF6 budget. SF6 emissions in China substantially increased from 2.6 (2.3-2.7, 68% uncertainty) Gg yr−1 in 2011 to 5.1 (4.8-5.4) Gg yr−1 in 2021. The increase from China is larger than the global total emissions rise, implying that it has offset falling emissions from other countries. Emissions in the less-populated western regions of China, which have potentially not been well quantified in previous measurement-based estimates, contribute significantly to the national SF6 emissions, likely due to substantial power generation and transmission in that area. The CO2-eq emissions of SF6 in China in 2021 were 125 (117-132) million tonnes (Mt), comparable to the national total CO2 emissions of several countries such as the Netherlands or Nigeria. The increasing SF6 emissions offset some of the CO2 reductions achieved through transitioning to renewable energy in the power industry, and might hinder progress towards achieving China’s goal of carbon neutrality by 2060 if no concrete control measures are implemented.

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Section: Methodsmentioning

confidence: 99%

Sustained growth of sulfur hexafluoride emissions in China inferred from atmospheric observations

An,

Prinn,

Western

et al. 2024

Nat Commun

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“…In addition to the flask samplings above, there were also high-frequency in situ measurements at SDZ during the study period. More detailed information about the measurement sites and sampling processes have been provided in previous papers. − …”

Section: Methodsmentioning

confidence: 99%

Anthropogenic Chloroform Emissions from China Drive Changes in Global Emissions

An,

Western,

et al. 2023

Environ. Sci. Technol.

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Emissions of chloroform (CHCl 3 ), a short-lived halogenated substance not currently controlled under the Montreal Protocol on Substances that Deplete the Ozone Layer, are offsetting some of the achievements of the Montreal Protocol. In this study, emissions of CHCl 3 from China were derived by atmospheric measurement-based "top-down" inverse modeling and a sector-based "bottom-up" inventory method. Topdown CHCl 3 emissions grew from 78 (72−83) Gg yr −1 in 2011 to a maximum of 193 (178−204) Gg yr −1 in 2017, followed by a decrease to 147 (138−154) Gg yr −1 in 2018, after which emissions remained relatively constant through 2020. The changes in emissions from China could explain all of the global changes during the study period. The CHCl 3 emissions in China were dominated by anthropogenic sources, such as byproduct emissions during disinfection and leakage from chloromethane industries. Had emissions continued to grow at the rate observed up to 2017, a delay of several years in Antarctic ozone layer recovery could have occurred. However, this delay will be largely avoided if global CHCl 3 emissions remain relatively constant in the future, as they have between 2018 and 2020.

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“…The station information is summarized in Supplementary Table 1 . Detailed descriptions for LAN, LFS, WLG, SDZ, XGL and JGJ can be found in previous studies 48 , 49 . All sites except JGJ and LAN are more than 20 km away from the nearest industrial areas and situated in elevated positions in order to sample background, well-mixed air, while JGJ and LAN are located ~10 km from their nearest industrial area.…”

Section: Methodsmentioning

confidence: 99%

“…The sampling and analysis procedure has been previously described 48 , 49 , and is briefly summarized here. Weekly flask air samples were collected at AKD, LFS, JSA, SDZ, WLG, XFG and XGL, and daily samples at JGJ.…”

Section: Methodsmentioning

confidence: 99%

Rapid increase in dichloromethane emissions from China inferred through atmospheric observations

Western

Say

et al. 2021

Nat Commun

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With the successful implementation of the Montreal Protocol on Substances that Deplete the Ozone Layer, the atmospheric abundance of ozone-depleting substances continues to decrease slowly and the Antarctic ozone hole is showing signs of recovery. However, growing emissions of unregulated short-lived anthropogenic chlorocarbons are offsetting some of these gains. Here, we report an increase in emissions from China of the industrially produced chlorocarbon, dichloromethane (CH2Cl2). The emissions grew from 231 (213–245) Gg yr−1 in 2011 to 628 (599–658) Gg yr−1 in 2019, with an average annual increase of 13 (12–15) %, primarily from eastern China. The overall increase in CH2Cl2 emissions from China has the same magnitude as the global emission rise of 354 (281−427) Gg yr−1 over the same period. If global CH2Cl2 emissions remain at 2019 levels, they could lead to a delay in Antarctic ozone recovery of around 5 years compared to a scenario with no CH2Cl2 emissions.

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Atmospheric CH3CCl3 observations in China: Historical trends and implications

Cited by 8 publications

References 40 publications

Sustained growth of sulfur hexafluoride emissions in China inferred from atmospheric observations

Sustained growth of sulfur hexafluoride emissions in China inferred from atmospheric observations

Anthropogenic Chloroform Emissions from China Drive Changes in Global Emissions

Rapid increase in dichloromethane emissions from China inferred through atmospheric observations

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