Gridded observational data

This Wiki page contains information regarding the setup of gridded observational reference data for VALUE

PARAMETERS, GRID, PERIOD, UNITS, FORMAT

Core parameters: T_mean and P at daily resolution (if T_mean not available it might be replaced by T_min and T_max)

Grid: Sub-grid (depending on region) of the common EURO-CORDEX rotated 0.11° grid (resolution of approx. 12 km)

Period: 1979-now (if possible 1958-now)

Units: T in [°C], P in [mm/day] (preferred; alternative: T in [K], P in [kg/m-2 s-1])

Missing value: -9999.

Format: NetCDF

REGIONS

Core: Norway, Spain, Austria, Emilia-Romagna, France, Poland

Annex (considered for later addition): Sweden (backup for Norway), Carpathians (if available), Switzerland (backup for Austria)

Note: Grided data for France and Poland will be hosted on the provider's website (no download via VALUE server). For Norway and Austria, the spatial interpolation of the observational data to the rotated EURO-CORDEX 0.11° grid has to be carried out by ourselves, for the other regions the data will already be provided on that grid.

RESPONSIBLE PERSONS

Norway -> Kotlarski
Spain -> Brands
Austria -> Kotlarski
Emilia-Romagna -> Pavan
France -> Pagé
Poland -> Jaczewski & Pianko
Sweden (not core) -> Bosshard
Switzerland (not core) -> Kotlarski

ECA&D stations -> Brands, Gutiérrez

INTERPOLATION

In cases where a high-resolution national grid has to be interpolated onto the EURO-CORDEX 0.11° grid (Norway, Austria), please use a conservative interpolation procedure.For the moment, do not apply a wet-day threshold.Please use the same interpolation technique for the grid cell orography (necessary for elevation correction of tmperature later on).

DEFINITION OF SUB-REGIONS

The data for an individual region does not have to provided on the entire EURO-CORDEX grid (covering the whole of Europe), but only for a rectangular sub-domain of it. A missing value of -9999. should be assigned to grid cells not covered by the national gridded data. Please find below the region definitions. xmin, xmax, ymin and ymax refer to the grid cell indices with respect to the standrad EURO-CORDEX 0.11° grid (424x412 grid cells). For each sub-region you'll find a NetCDF-file containing the real world as well as the rotated lat-lon coordinates of the sub-regional grid. Please use these coordinates as target when interpolating from a high-resolution national grid.

1) NORWAY

xmin=193, xmax=305, ymin=280, ymax=404
NetCDF coordinate file

2) AUSTRIA

xmin=204, xmax=256, ymin=173, ymax=200
NetCDF coordinate file

3) FRANCE

xmin=117, xmax=204, ymin=128, ymax=228
NetCDF coordinate file

4) POLAND

xmin=233, xmax=298, ymin=196, ymax=257
NetCDF coordinate file

5) SPAIN

xmin=60, xmax=164, ymin=104, ymax=183
NetCDF coordinate file

6) EMILIA-ROMAGNA

xmin=184, xmax=234, ymin=145, ymax=184
NetCDF coordinate file