The archived COSMO-CLM simulation data encompass a 14-day period of unusually-high convective activity over Germany, running from 27.5.2016 - 9.6.2016 (see Piper et al. [2016] <dx.doi.org/10.5194/nhess-16-2835-2016> for a detailed description). This period has been simulated at 0.025° resolution over the COSMO-DE domain, downscaled from 0.11° resolution COSMO-CLM simulations. This event is simulated in an 18-member ensemble using the domain-shift ensembe-generation technique (see, e.g., Rezacova et al. [2009] <http://dx.doi.org/10.1016/j.atmosres.2008.12.005> as an example). Boundary forcing comes from ERA-Interim (9 members) and MERRA2 (9 members) reanalyses. The simulations are then repeated for a future climate using a pseudo global warming (PGW) setup. The PGW warming profile with which the lateral and initial conditions are modified is based on a multi-model mean from 0.11° COSMO-CLM EURO-CORDEX simulations under the RCP8.5 scenario forced with the GCMs MPI-ESM-LR, EC-EARTH and CNRM-CM5. The change signal is based on 2070-2099 versus 1970-1999 31-day running means.
In the archive, data marked with the term "PRESENT" correspond to the present-day ensemble and data marked with "PGW" to the future-climate (RCP8.5) PGW ensemble. In total, there are 18 members per ensemble, for both resolutions.
- Spatial resolution: the simulations are at two spatial resolutions, 0.11° and 0.025°. The former provide the boundary conditions for the latter. TGZ files of the form BB11*.tgz contain the 0.11° data, otherwise the resolution is 0.025°.
- Simulation domains: the 0.11° domain is similar, though smaller than, the EURO-CORDEX domain. The 0.025° domain corresponds to the COSMO-DE domain used be the German Weather Service (DWD). Note that for storage the edge regions of the simulation domains have been removed, in order to reduce the file sizes; this simply removes the areas at the edge of the domain which wouldn't anyway be analysed due to spin-up effects. The exact cut-out can by seen by "ncdump -h" on any of the files.
- Temporal resolution: all data are available at hourly resolution. Additionally, in the 0.025° simulations, precipitation is available at 5-minute resolution.
- Available 2D variables include: precipitation, evaporation, surface fluxes, CAPE, CIN, clouds, graupel, PBL height, freezing level, pressure, 2-metre variables (humidity, temperature and dew point), column-integrated variables (cloud ice, cloud water, cloud graupel, moisture), surface temperature, 10-m winds and more.
- Available 3D variables (model levels) include: perturbation pressure, specific humidity, temperature, winds, vertical velocity.
The archives also contain the model namelist settings and restart files (named under the convection lrfdYYYYMMDDHHo). CCLM and INT2LM versions are COSMO_131108_5.0_clm16 and int2lm_131101_2.00_clm4, respectively.
The 0.025° archives also contain files of the form cclass_de025-<ensemble member>_<reanalysis>_<present|pgw>_cclm_1hr_YYYYMMDD-YYYYMMDD.nc and uv-plevs_de025-<ensemble member>_<reanalysis>_<present|pgw>_cclm_1hr_YYYYMMDD-YYYYMMDD.nc. The former contains classification of the precipitation type (e.g. convective, stratiform, etc.) following the method of Poujol et al. (2019, <http://dx.doi.org/10.1002/qj.3706>), while the latter contain winds interpolated to 500-, 700-, and 850 hPa.
These data were produced as part of the ClimXtreme project <https://www.climxtreme.net/>, funded by the Bundesministerium für Bildung und Forschung (BMBF). Specifically, as part of the sub-project XPreCCC under grant number 01LP1902H. All simulations were performed on Mistral at the DKRZ.