Ozone, UV and Aerosol studies

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Completed Actions

ES0604: Atmospheric Water Vapour in the Climate System (WaVaCS)

The Action brings together leading European scientists to address the issue of atmospheric water vapour and its impact on climate. This Action is needed to integrate research carried out in different areas, including: atmospheric monitoring, data analysis and modelling. It brings together expertise that is both unique and timely.

In order to make significant progress in the field of water vapour and climate, it is necessary to integrate knowledge acquired from research based on different methodologies. To achieve this, the Action is structured into 4 working groups which together aim to increase knowledge on observations, theory, and data assimilation in the context of water vapour and climate.

The objective is to offer to the scientific community and the broader Earth Observation community an integrative approach to understanding the processes controlling the atmospheric water vapour distribution, in particular those elements linking water vapour and climate. Beneficiaries of this Action include the meteorological services, space agencies, environmental agencies and policy makers. The specific task of this Action is to promote knowledge dissemination activities at various levels through scientific missions, thematic training schools, support toward conference participation, and special issues in world-class scientific journals.

In order to implement an interdisciplinary approach, the Action will promote and support four cross-cutting Working Groups. The first two activities aim at improving the knowledge on observation systems and processes. The third and fourth activities aim at integrating and structuring this knowledge.


R. Van Malderen was a member of the management committee and participated to several workshops and a summer school.

More information on this Action can be found on the Action's homepage, or on the Action's webpage on the COST website.


ES726: Long term changes and climatology of UV radiation over Europe

Since UV solar radiation plays an important role in many processes in the biosphere, including the influence on human organisms and may be very harmful if UV exposure exceeds "safe" limits, the knowledge of biologically effective UV radiation doses and their geographical distribution and climatology in Europe is crucial for the European population. The main objective of the Action was to advance the understanding of UV radiation distribution under various meteorological conditions in Europe in order to determine UV radiation climatology and assess UV changes over Europe.

To achieve its general objective, the Action had the following practical objectives:
1) to inventory available solar radiation data sets, including UV data, spectral and broadband, ancillary data (ozone, clouds, sunshine etc.) and available satellite data,
2) to advance the understanding of UV reconstruction models for the calculations of UV climatology and assessment of UV changes,
3) to advance the understanding of biological UV radiation climatology and changes in Europe,
4) to advance the understanding of UV influence on ecosystem, both on the basis of climatology and changes of selected effective UV radiation doses in Europe,
5) to use the advanced knowledge under the points above, in order to elaborate a comprehensive analysis and information basis, addressed to beneficiaries,
Additionally, special attention had to be paid to application of QC/QA procedures for the UV measurements with broadband instruments. To get homogeneity of the broadband data, an additional objective is:
6) to create an European reference group of broadband radiometers.

To achieve these objectives, four working groups were established:
WG1 - Data collection
WG2 - UV modelling
WG3 – Requirements for biological UV effects
WG4 - Quality Control

H. De Backer was the leader of WG1 and A. Cheymol was a member of WG2. They were both also part of the management committee.

More information on this Action can be found on the Action's homepage, or on the Action's webpage on the COST website.


ES1207: A European Brewer Network (EUBREWNET)

This action coordinates Brewer spectrophotometer measurements of ozone, spectral UV and aerosol optical depth (AOD) in the UV within Europe. It unites the ozone, UV and AOD communities through a formally managed European Brewer Network capable of delivering a consistent, spatially homogeneous European data resource, significant for the World Meteorological Organisation (WMO), the World Ozone and UV data centre (WOUDC), the International Ozone Commission (IO3C), the Intergovernmental Panel on Climate Change (IPCC), Global Monitoring for Environment and Security (GMES) and the ozone trend assessment panels.

Around 50 Brewer spectrophotometers are deployed in Europe, independently funded by national agencies, each duplicating effort to achieve seperately best practice and accuracy. This COST action is the ideal mechanism to remove this disparity, to establish knowledge exchange and training and to open up a route to links with international agencies and other networks globally.

Four different working groups will work together to establish a coherent European Brewer spectrophotometer network:

  • WG 1: Instrument characterisation and calibration
  • WG 2: Algorithm development
  • WG 3: Network governance and data management
  • WG 4: Users, public outreach and applications

Our team was mostly involved with the activities of WG 3. More specifically, V. De Bock was the leader of WG 3 and a member of the Management Committee. A. Mangold was also a member of the Management Committee and R. Van Malderen was a substitute member.

The Action's homepage can be found here and more information is also available from the Action's webpage on the COST website.