Polar stratospheric clouds made of hydraded nitric acid plays an important role in ozone chemistry, and they may be quite spectacular to look at when illuminated by the setting Sun. Photo: Aqqalooraq Kielsen, Tasiilaq, Greenland, 30th of January 2008.

The stratosphere is responsible for many processes influencing weather, climate and environment on Earth. Most noticeable is the impact of the ozone layer on nature and human civilization, but it is also becoming increasingly evident that stratospheric processes have large impact on the tropospheric climate.

At the DMI research is performed by monitoring stratospheric composition through balloon measurements, satellite retrievals and ground-based remote sensing. Process studies on mesoscale as well as cloud modelling on microphysical scale is performed in international collaborations. Models are used for assistance of monitoring activities, process studies and climate studies.  

EuMetChem COST Action ES1004: European Framework for Online Integrated Air Quality and Meteorology Modelling  (link: english (external)

Project aims: Focus on a new generation of online integrated Atmospheric Chemical Transport and Meteorology (Numerical Weather Prediction and Climate) modelling with two-way interactions between different atmospheric processes including chemistry (both gases and aerosols), clouds, radiation, boundary layer, emissions, meteorology and climate. Two application areas of the integrated modelling are planned to be considered: (i) improved numerical weather prediction and chemical weather forecasting with short-term feedbacks of aerosols and chemistry on meteorological variables, and (ii) two-way interactions between atmospheric pollution/ composition and climate variability/ change.  Establishment of such a European framework (involving also key American experts) will enable the EU to develop world class capabilities in integrated ACT/NWP-Climate modelling systems, including research, education and forecasting.

DMI’s role: Leading EuMetChem COST Action; Core Group and Management Committee Meetings; contributions to WG1 “Strategy and framework for online integrated modelling”, WG2 “Interactions, parameterizations and feedback mechanisms”, WG3 “Chemical data assimilation in integrated model”, WG4 “Evaluation, validation and applications” with Enviro-HIRLAM online integrated meteorology-chemistry model research and development results; organization of young scientist summer school on integrated modelling (Jul 2014, Aveiro, Portugal); hosting short-term scientific missions for young scientists.

FundingEU Coordination Action; total budget – 600 KEu

Period: 1 Apr 2011 – 1 Mar 2015

CollaboratorsCoordinator – Prof. Alexander Baklanov (DMI); COST EU 23 participants (Austria, Bulgaria, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Israel, Italy, Malta, Netherlands, Norway, Poland, Portugal, Serbia, Slovenia, Spain, Sweden, Switzerland, Turkey, UK), COST neighboring countries (Ukraine, Russia, Egypt), international partners (USA, Brazil), and international organizations (JRC, ECMWF, EEA)

Participants from DMIAlexander Baklanov, Alexander Mahura, Ulrik Korsholm, Ashraf Zakey and Roman Nuterman

Monitoring the Ozone Layer and the Solar UV radiation in Greenland (link: danish (external))

Project aims: To continue the monitoring that was started in the early 90'es in order to fulfill the danish obligations to the "Vienna Convention for the Protection of the Ozone Layer". Part of the network for the Detection of Atmospheric Compostion Change (NDACC).

DMI’s role: 
To measure the Ozone Layer and the solar UV radiation at three locations in Greenland, at Thule/Pituffik, Scoresbysund/Ittoqqortoormiut and Sondre Stromfjord/Kangerlussuaq.

FundingDanish Environmental Protection Agency, Danish Energy Agency, DMI.

Period: Jan 1st, 2014 – Dec 31st 2016

Participants from DMIPaul Eriksen, Nis Jepsen, Helge Jønch-Sørensen and Niels Larsen

AC SAF (Link: english/danish (external) )

Project aims: The Satellite Application Facility on Atmospheric Composition Monitoring (AC SAF)  produces, archives, validates and disseminates ozone and atmospheric chemistry products, to support the services of the EUMETSAT Member States in weather forecasting, as well as monitoring of ozone depletion, air quality and surface UV radiation.

DMI’s role: 
DMI is responsible for the production, validation and dissemination of  the Near Real Time UV index products (

Funding: EUMETSAT.

Period: Mar 2012 – Feb 2017.   CDOP-3 :  Mar. 2017 - Feb. 2022


Participants from DMI: Helge Jønch-Sørensen

StratoClim: Stratospheric and upper tropospheric processes for better climate predictions (link: english (external))

Project aims: StratoClim will produce more reliable projections of climate change and stratospheric ozone by a better understanding and improved representation of key processes in the Upper Troposphere and Stratosphere (UTS). This will be achieved by an integrated approach bridging observations from dedicated field activities, process modelling on all scales, and global modelling with a suite of chemistry climate models (CCMs) and Earth system models (ESMs).

DMI’s role: We will focus on the coupling between the stratosphere and the troposphere in extra-tropical winters. The definition of sudden stratospheric warmings will be reassessed as well as the mechanism of the stratosphere/troposphere coupling.

FundingFP7 Collaborative project.

Period: Dec 1st 2013 to March 2018.

Collaborators28 partners from 11 countries

Participants from DMIBo Christiansen and Shuting Yang