Polar Atmosphere Phenomena
: Focusing on the Polar Vortex
Destruction of the Ozone layer
1. Montreal Protocol and the Ban on Ozone-Depleting Substances (ODS)
• Since the adoption of the Montreal Protocol, global ODS consumption has been reduced by more than 99%. As a result, the growth of the ozone hole has halted, and clear signs of ozone recovery have begun to emerge.
• By comparing scenarios with and without the Montreal Protocol, it becomes clear how effective ODS reductions have been. The data show that Equivalent Effective Stratospheric Chlorine (EESC) peaked in the past and has since been declining, demonstrating the tangible impact of the Protocol.
2. Continuous Monitoring and Early Warning System Enhancement
Ozone layer depletion occurs through the combined effects of chemical factors (ODS) and meteorological factors (polar vortex strength, stratospheric temperatures, PSC formation). Therefore, continuous observation data are essential to accurately assess ozone recovery, along with systems capable of detecting early warning signals. Such monitoring and alert systems can provide significant benefits for policy making and scientific research.
• Ozone monitoring integrates satellite, ground-based, and meteorological data. Satellites track ozone levels and stratospheric conditions to monitor
ozone hole changes, while ground-based instruments such as spectrophotometers and radar precisely measure ozone distribution. Meteorological data
provide indicators of ozone depletion, including the polar vortex and PSC.
• Major predictive models analyze stratospheric temperatures and the polar vortex to forecast the size, persistence, and breakdown timing of the ozone
hole several months in advance.
3. Promotion of Alternative Substance Research
Alternative substances are replacing ozone depleting chemicals across key sectors. Natural refrigerants and low-GWP HFO’s are used in cooling, while safer blowing agents and medical propellants have replaxed CFCs. Halons are being substituted with inert gases, water mist, and fluorine-free foams, and methyl bromide with pest management and safer fumigants. These changes help the ozone layer lowering climate impacts.
• The use of natural refrigerants such as carbon dioxide, ammonia,
and hydrocarbons is increasing in refrigerators and air conditioners.
New synthetic refrigerants also have low impacts on global warming,
but they can be flammable or toxic, so safe system design is essential.
• Fire extinguishers are being replaced with alternatives to ozone-
depleting halons, such as nitrogen-argon gas mixtures, water mist,
and fluorine-free foams.
• Agricultural fumigants and disinfectants are also moving away from
ozone-depleting substances, being replaced by pest management
practices, alternative chemicals, and soil treatment using solar heat.