Several reference grids (with 0.5° 1°, and 2° spatial resolution) are used in the Atlas to interpolate CORDEX, CMIP5 and CMIP6 ensembles to common regular grids (also 0.25° for regional observations and EURO-CORDEX). Some datasets produced using these masks are:
- land sea masks:
land_sea_mask_*.nc4 - mountain ranges masks:
mountain_ranges_mask_*.nc4
A Jupyter notebook illustrating a simple example of their use in R is provided in notebooks. The figure below represents these masks for the 0.5°, 1°, and 2° resolutions.
The land-sea masks for the 0.5°, 1°, and 2° grids are produced using the land-sea mask of the WFDE5 dataset (ERA5 bias adjusted, file ASurf_WFDE5_CRU_v1.1.nc). The coarser 1° and 2° grids are produced upscaling the 0.5° grid and using a ≥0.5 threshold for land/sea ratio in the resulting gridboxes. The 0.25° grid is obtained from the ERA5 grid (land-sea mask), considering the same threshold (0.5) for land/sea ratio.
The mountain ranges masks (0.5°, 1°, and 2°) have been defined using the K1 global mountains GIS datalayer (USGS Land Change Science Global Ecosystems; file: GlobalMountainsK1Binary.zip; Kapos et al. 2000). The raster is based on 1 km DEM and has been upscaled to 0.5° using a 0.75 threshold for mountain area extent within the gridbox. The 2° and 1° masks are upscaled versions of the 0.5° grid considering a 0.5 threshold for mountain area extent within the gridbox to better match the mountain areas in the different resolution grids.
Includes auxiliary masks used to filter out gridboxes with no observational data (infilled with distintant station values) for different observational datasets used in the Interactive Atlas (http://interactive-atlas.ipcc.ch/regional-information).
Kapos, V., J. Rhind, M. Edwards, M. Prince, and C. Ravilious (2000) Developing a map of the world’s mountain forests. In: M. Price and N. Butt (eds), Forests in Sustainable Mountain Development, IUFRO Research Series 5, CABI Publishing, Wallingford, UK; pp. 4-9.