Astronauts marvel at the narrow blue band of Earth's atmosphere, glimpsed side-on from orbit. This is the place where we live: the atmosphere is the source of all the air we breathe and shields us from harmful radiation.
Though change is in the air, unfortunately ongoing human activity is altering the composition of the atmosphere, adding vast levels of carbon dioxide, nitrogen, methane, other trace gases and aerosols. Global warming is only one unwelcome consequence – its future effects still unclear – along with atmospheric ozone depletion, acid rain and pollution plumes that impact human health.
Space-based sensors help detect otherwise invisible changes, peering either sideways or down through the atmosphere to build up three-dimensional views of its chemical composition, sensitive to a few parts per billion.
ERS-2's GOME tracked the polar ozone holes for more than 15 years, supplemented by Envisat's GOMOS and MIPAS until 2012. Envisat's SCIAMACHY sensor showed concentrations of carbon dioxide and other key greenhouse gases. Meanwhile imaging spectrometers – such as Envisat's MERIS and Proba-1's CHRIS – are sensitive to clouds and aerosols whose climate effects are yet to be fully quantified.
27 November 2019
Strange ribbons of purple light that appeared in the sky – known as Steve – became the subject of debate in 2017, as their origins were unbeknown to scientists. Now, photographs of this remarkable phenomena have been studied to understand their exact position in the night sky.
18 September 2019
Over 700 Earth observation satellites are orbiting our planet, transmitting hundreds of terabytes of data to downlink stations every day. Processing and extracting useful information is a huge data challenge, with volumes rising quasi-exponentially.
Specific Topics on Atmosphere
A number of live operational products are produced which are aimed at increasing our understanding of the complexity of atmospheric chemistry: both trace gases and aerosols.
With the increased interest in supporting and monitoring the implementation of international treaties on the World's Climate, such as Kyoto, the work dedicated to the study of the full range of variables is extensive.
The analysis of the properties of clouds is aimed at understanding their evolution and development. In particular this work hopes to improve rainfall prediction techniques.
The measurement of change in the ozone layer is today operationally possible at a high temporal and spatial resolution in near real-time allowing ongoing updates of the effects of pollution.
The input of satellite data into meteorological modeling for weather forecasting is well established with satellites fully dedicated to supporting its operational requirements.
The modelling of radiation processes are essential to our understanding of the energy cycles between the land surface and the atmosphere. In addition to which they provide an important input to the planning of solar energy programmes.
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