However, the data presented and analysed in this paper indicate that in China more than the agreed amount of HFC-23 has been emitted since 2015, resulting either from unsuccessful factory-level HFC-23 abatement and/or inaccurate quantification of emission reductions. Commitments were made to reduce emissions of HFC-23 during the production of HCFC-22 as part of agreements in the protocol. HFC-23 does not deplete stratospheric ozone but is a very potent greenhouse gas.
Trifluoromethane (HFC-23) is one of the substances regulated by the Montreal protocol since the Kigali amendment in 2016. Ultimately, the protocol has resulted in a reduced halogen loading of the atmosphere since the mid-1990s. The protocol was successfully implemented and, over the years, amendments and adjustments of the protocol were essential to its success. The international Montreal Protocol was signed in 1987 in order to protect the atmospheric ozone layer by phasing out the production of halogenated hydrocarbons that deplete stratospheric ozone.
Overall, the article highlights the need and future directions of increasingly interdisciplinary efforts to characterize the atmospheric multiphase chemistry system and its impacts on climate-chemistry interactions, atmospheric oxidation capacity and human health. They also identify chemical parameters to be further constrained in lab and field studies. The authors propose how complementary techniques, such as machine learning and molecular dynamics, can be used to constrain the resulting model complexity. Similarly, the complexity of multiphase chemistry models has been increasing to include in detail the underlying chemical processes and phase transfers between gas, aqueous, and organic phases. In this article, significant advancements in measurement techniques during the past 20 years are briefly described that led to the identification of thousands of organic compounds and molecular-scale processes within the atmospheric multiphase system. aerosol particles and cloud droplets surrounded by a gas phase, has been recognized for several decades to affect the atmospheric composition. The role of chemical reactions within the atmospheric multiphase system, i.e. Wennberg, Armin Wisthaler, Glenn Wolfe, Caroline Womack, Lu Xu, Robert Yokelson, and Carsten Warneke Veres, Rebecca Washenfelder, Petter Weibring, Paul O. Tanner, Laura Tomsche, Krystal Vasquez, Patrick R.
Schwarz, Kanako Sekimoto, Vanessa Selimovic, Taylor Shingler, David J. Nowak, Demetrios Pagonis, Jeff Peischl, Anne E. Katich, Aaron Lamplugh, Young Ro Lee, Jin Liao, Jakob Lindaas, Stuart A. Hanisco, Reem Hannun, Alan Hills, Gregory Huey, Jose L. Day, Joshua DiGangi, Glenn Diskin, Alan Fried, Jessica Gilman, Hongyu Guo, Johnathan W.
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