Webinar – Ozone Hole Monitoring in Antarctic

This past training was on

Thursday 5th of August 2021

In this webinar, we will download and process Sentinel-5P data using the Python language to study the unusually large Antarctic ozone hole in October 2020.


Ozone is a gas whose abundance varies in our atmosphere. While tropospheric ozone is an air pollutant and a greenhouse gas, the stratospheric ozone layer shields the biosphere from harmful solar UV radiation.

Invented in the 1930s, chlorofluorocarbons (CFCs) met a significant success from the 1950s in various industries. Their remarkable properties (non-flammable, easily compressible, insoluble, stable) made them an ideally cheap alternative to noble gases. With their low chemical reactivity, CFCs were additionally believed to be of low environmental toxicity. Only a few decades later did we discover that these substances were photo-chemically active and causing a major depletion of the ozone layer above Antarctica. Since the 2000s, CFCs have been banned, and the ozone layer has gradually and slowly been recovering.

Despite the ban on CFCs, an Ozone hole is still forming every year in late winter/early spring above Antarctica. The extremely cold winter temperatures coupled to a strong polar vortex enhance the ozone depleting effects of the CFCs in this region. In 2020, the Antarctic Ozone hole started by mid-August and ended in late December. It was unusually long and deep due to remarkably cold stratospheric temperatures and exceptionally powerful polar winds.
Monitoring the ozone layer is hence key to assess the effects of the global efforts that have been carried out since the Montreal Protocol signature in 1987. Data on the thickness of the ozone layer throughout the year and everywhere on Earth is also essential to estimate the recovery rate of this invisible layer that protects life on Earth. To this end, authorities and the scientific community rely on space-based technologies as they offer a unique and reliable way to monitor ozone daily and globally.

In this context, Sentinel-5P was launched in October 2017. Its main purpose is to screen the Earth’s atmosphere and quantify different pollutants (O3, CO, NO2, SO2, aerosols…) with a great accuracy and spatial resolution. It also provides measurement continuity with precedent and ongoing atmospheric spatial missions (OMI, IASI and SCHIAMACHY). The data recorded by this satellite are free of use and present a great interest to globally monitor air quality, greenhouse gas emissions and detect and assess the impact of polluting events.


Attendees must be in possession of their own computer with an internet connexion

Cost & Participation

Attendance to the webinar course is free of charge.

Audience & Selection

Everyone is welcome to attend ! Do not hesitate, register now !

Application opening – closing

Wednesday 30th of June 2021 – Friday 30th of July 2021

Repeat the webinar

Here is the recording of the session:

Previous RUS webinars on Atmospheric Monitoring

Feel free to check the previous RUS webinars on Sentinel-5P data processing to monitor our atmosphere!

ATMO01 – Air Quality Monitoring with Sentinel-5P

ATMO02 -Pollution Monitoring with Sentinel-5P

ATMO03 – Monitoring Volcanic Emissions with Sentinel-5P


Atmospheric Studies Engineer

Laura Watson, NOVELTIS

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Webinar – Ozone Hole Monitoring in Antarctic

Training date & time

Thursday 5th of August 2021

14:30 – 16:00 CEST Q&A included


This webinar will be held fully online.