Why do we celebrate this day?
Over three decades ago, protection of the depleting ozone layer was made a global priority and the “Montreal Protocol” was introduced. This international protocol was designed so that the production of various chemicals released into the atmosphere, mainly chlorofluorocarbons (CFCs) would be phased out in order to halt further depletion.
According to the United Nations (UN), the Montreal Protocol has:
The ozone layer acts like a ‘shield’, filtering the Sun’s ultraviolet radiation and protecting us from its harmful effects. Ozone depletion was first observed by scientists in the late 1970s and resulted in a ban on the manufactured chemicals which cause it, eventually resulting in the introduction of the treaty which has been ratified by all of the world’s 197 countries.
As a result of this international agreement, ozone depletion has stopped and the ozone layer is slowly recovering. It is therefore important to recognise this occasion by marking it as a special day to be celebrated, but also to continue to educate the public and remind world leaders, large corporations, and key decision makers to stay vigilant on issues such as the health of our atmosphere.
Kenneth Holmlund, Chief Scientist at EUMETSAT commented:
How do we monitor ozone?
Satellites such as EUMETSAT’s Metop series of three polar-orbiting weather satellites play a key role in monitoring global ozone.
With their on-board Global Ozone Monitoring Experiment–2 (GOME-2) instrument, the Metop satellites are able to get a detailed picture of the total atmospheric content of ozone and the vertical ozone profile in the atmosphere.
Federico Fierli, Atmospheric Composition Training Officer at EUMETSAT discusses the GOME-2 instrument:
Data taken from the GOME-2 instrument on board both Metop-A & -B and compiled by the AC-SAF database.
Monitoring of the ozone layer using EUMETSAT data
The EUMETSAT Satellite Application Facility on Atmospheric Composition Monitoring (AC SAF) is part of the distributed EUMETSAT ground segment. It is responsible for developing retrieval algorithms, processing and archiving data as well as disseminating data to users.
Seppo Hassinen, AC SAF Project Manager said:
This animation shows the EUMETSAT AC SAF GOME-2 total ozone data, assimilated into the ROSE 3D Chemistry-Transport Model at the German Aerospace Center (DLR). This animation reveals the ozone hole development over Antarctica for the years: 2015, 2016, 2017 and 2018.
These large, yearly variations are caused by meteorological and dynamical conditions. The large minimum area over Antarctica is due to stable polar-wind circulation around this continent and thus, long continuing ozone depletion inside the area. In the Northern Hemisphere, the dynamical field is more chaotic and so, a similar, stable situation cannot normally be formed.
Improving future capabilities and tackling the future
The EPS-SG satellites will follow in the Metop heritage-footsteps by providing global monitoring of ozone and other atmospheric trace gases with enhanced accuracy. The EPS-SG satellites are expected to be operational for approximately 15 years, ensuring future long-term monitoring of the planet.
Meteosat Third Generation (MTG) is EUMETSAT’s next generation of geostationary satellites. The MTG-S (sounding) line will establish a world first, hyper spectral infrared sounding (IRS) capability in geostationary orbit that will deliver vertical profiles of temperature and moisture every 30 minutes over Europe.
MTG is one of the most innovative satellite systems under development in Europe and aims to deliver new capabilities for the real-time monitoring of atmospheric profiles, air quality (e.g. tropospheric ozone and carbon monoxide) and dispersion of atmospheric pollution.
EUMETSAT will generate products derived from MTG and EPS-SG satellite data for the benefit of society and the planet.
32 Years and Healing
This year’s theme reminds us why it is so important to work together in order to achieve positive results – this is only possible if we collaborate on a global scale and make big changes.
The UN also stated that:
The Southern Hemisphere will follow in the 2050s and Polar Regions by 2060. Ozone layer protection efforts have also contributed to the fight against climate change by averting an estimated 135 billion tonnes of carbon dioxide equivalent emissions, from 1990 to 2010.
According to CAMS, the “2019 ozone hole could have the smallest area of any Antarctic ozone hole since the mid-eighties”. Read more here.
The planet has a remarkable way of recovering – if we let it.