The Empirical Statistical Downscaling White Paper, ESD White Paper, is now published!

The Empirical Statistical Downscaling White Paper, ESD White Paper, is now published! This version of the ESD White Paper focuses on empirical statistical downscaling strategies and identify specific challenges within ESD.

Last year the CORDEX Science Advisory Team (SAT) published the first CORDEX White Paper which primarily focuses on dynamical downscaling and its scientific challenges.

These two White papers will be followed by a third on bridging climate science with society needs. Those papers will form the basis for the CORDEX Science Plan.

CORDEX-CMIP6 Atmosphere Variable List

The Second Order Draft (SOD) of the CORDEX-CMIP6 Atmosphere Variable List (VL) was shared with the CORDEX community in January 2022. We are very grateful to all who have read the SOD in detail and provided comments. The final version of the CORDEX-CMIP6 Atmosphere Variable List is ready and we share it with the CORDEX community.

All together we received about 40 comments on the SOD and the first priority has been given to topics with a number of similar comments. We tried to find a balance between requests for providing more variables at higher subdaily frequencies and requests for reducing output size by archiving a number of variables at lower subdaily frequencies. The CORDEX-CMIP6 Atmosphere Variable List has a lot of flexibility to select output variables and their output frequencies to accommodate capacities of different RCM groups.

A tutorial to the CORDEX-CMIP6 Data Request describing how to select output variables and their output intervals and how to archive a number of specific variables is also provided.

To the web page Data request.

Experiment protocol RCMs is published!

The CORDEX experiment design for dynamical downscaling of CMIP6 is now published!

The Second Order Draft (SOD) of the CORDEX experiment design (protocol hereafter) for dynamical downscaling of CMIP6 was shared with the CORDEX community in February 2021. We are very grateful to all who have read the SOD in detail and provided comments. The final version of the new CORDEX-CMIP6 protocol is ready and hereby we share it with the CORDEX community. In order to keep the process of developing the CORDEX protocol transparent and open for the community, here, the CORDEX Science Advisory Team (SAT) provides response to the comments on the SOD and how they have been addressed in the final version.

Please find the CORDEX-CMIP6 protocol here and the CORDEX SAT responses to the SOD comments here.

Future Scientific Challenges for CORDEX; the White Paper

The Future Scientific Challenges for CORDEX, the White Paper, is now published!

The CORDEX Science Advisory Team (SAT) has developed a White Paper with the purpose to point out scientific challenges in regional climat modelling for bettter informed decision making process in regions and setting the basis for the CORDEX science plan.

The White Paper has also been published as a CORDEX newsletter. If you want to subscribe to our newsletters, please go here.

Scientific highlights at the Polar CORDEX meeting

The Polar CORDEX meeting was held online 5-7 October 2020 with the aim to present updates by the Arctic and Antarctic CORDEX community and discuss future projects/collaborations. The meeting had a very good gender balance with 12 women and 14 men. The participants were mainly from Europe and North America, but there were also participants from India, Chile, Argentina and Japan.

Arctic and Antarctic scientific highlights

The Arctic CORDEX session had seven science presentations, which focused on new modelling efforts, key drivers of Arctic cyclones, simulations of future climate change, and teleconnections. One of the highlights was an improvement in simulation of temperature at the snow/ice surface in the CCLM model.

The four science presentations in the Antarctic CORDEX session focused on new modelling efforts, improved understanding of clouds, and efforts to model surface mass balance. One of the highlights was details of a new model to Antarctic CORDEX, the polar region climate model NHM-SMAP (Japan Meteorological Agency).

Polar CORDEX: Next Steps

The ‘Polar CORDEX: Next Steps’ session had both presentations and discussions. One of the science highlights was the presentations on how the Polar CORDEX simulations will be used for the IPCC Interactive Atlas. The discussions identified key ways for the Polar CORDEX to collaborate in the future, especially involving both the MOSAiC and the YOPP supersite observations. Furthermore, the benefit of a closer link to the satellite community e.g. via the ESA Climate Change Initiative (CCI) was discussed. An important outcome was the agreement to increase the size of the Antarctic CORDEX domain to encompass more of the Southern Ocean, so that output from the model simulations could be used more for impact studies (e.g. forcing sea-ice and ocean models).

There was also a recognition that undertaking studies involving multiple Polar CORDEX models was highly beneficial.

A night sky with stratospheric clouds and the sky tinted orange from the sunset. At the front of the picture Antarctica in the dark
Nacreous (polar stratospheric) clouds over Hut Point and McMurdo Sound, Antarctica. Photo: John Cassano

A successful first online Polar Meeting

This was the first time a Polar Meeting was held online but the overall feedback was positive. By keeping the individual sessions short (2 hours), spread over 3 days (one session per day), and limiting each presentation to 15 minutes everything worked well. Also, separating the sessions out into ‘Arctic CORDEX’, ‘Antarctic CORDEX’, and ‘Polar CORDEX, Next Steps’ meant that each session was well focused. The material presented was excellent, and each presenter was disciplined and stuck to their allocated time. Also, the Discussion/Next Steps worked well as it was emphasized the strong collaboration that Polar CORDEX is built on, and discussed some very timely projects such as how Polar CORDEX contributes to IPCC AR6 Regional Atlas and could contribute to MOSAiC and YOPP (Year of Polar Prediction) supersite intercomparison.

Next meeting in autumn 2021

The next Polar CORDEX meeting is planned to be held in autumn 2021 and hopefully a in person meeting will be possible at that time.