STRÅNG - development

The objective of the project is twofold. First the STRÅNG system needs to be adapted to the region and output of the new operational numerical weather prediction model, second the model should be improved in a number of areas (e.g. albedo, aerosols, inconsistency between global and direct radiation).

During the spring 2014 HARMONIE replaced HIRLAM as the SMHI operational NWP model. Since STRÅNG uses data from HIRLAM, both directly and indirectly via the analysiis system MESAN, it needs to be adapted to work with new input data before HIRLAM is closed down in 2016 (e.g. due to different model physics in HARMONIE compared to HIRLAM). Moreover the STRÅNG system has been running since 1999 without major overhaul and is known to have weaknesses as mentioned above. As a result of this project, STRÅNG users can look forward to an improved model with a much higher spatial resolution, 2.5 km compared to today's 11 km. The Swedish Environmental Protection Agency (NV) and Swedish Radiation Safety Authority (SSM) use STRÅNG to follow up the national environmental goals ("Säker strålmiljö" and "Skyddande ozonskikt") and to monitor the carbon balance ("Miljömålet Begränsad klimatpåverkan"). There are also users from a diversity of areas such as solar energy, biology and material science.

Role of SMHI

The work is carried out by SMHI and is funded by SMHI, The Swedish Environmental Protection Agency (NV) and Swedish Radiation Safety Authority (SSM). It will run for two years; 2015-2016.

Contact person at SMHI is Tomas Landelius.