Input data set: Lakes area fraction

Direct human forcings: Annual, gridded lake area fraction (percentage of lakes in a grid cell) data for the ISIMIP3a simulation round, covering the periods 1850-1900 and 1901-2021. It accounts for growing lake area fraction due to reservoir construction.

The data are derived from the HydroLAKES v1.0 (Messager et al., 2016) and GRanD v1.3 (Lehner et al., 2011) databases and rasterized using the polygon_to_cellareafraction tool (Vanderkelen 2021, available on GitHub), and mapped to 0.5 degrees resolution. Time steps represent increasing reservoirs in their construction year, as given by GRanD.

Reservoirs from 2017 onwards are kept constant.

- Messager, M., Lehner, B., Grill, G. et al. Estimating the volume and age of water stored in global lakes using a geo-statistical approach. Nat Commun 7, 13603 (2016). https://doi.org/10.1038/ncomms13603
- Lehner, B., Liermann, C.R., Revenga, C., Vörösmarty, C., Fekete, B., Crouzet, P., Döll, P., Endejan, M., Frenken, K., Magome, J., Nilsson, C., Robertson, J.C., Rödel, R., Sindorf, N. and Wisser, D. (2011), High‐resolution mapping of the world's reservoirs and dams for sustainable river‐flow management. Frontiers in Ecology and the Environment, 9: 494-502. https://doi.org/10.1890/100125
- HydroLAKES Version 1.0 → https://www.hydrosheds.org/pages/hydrolakes
- The Global Reservoir and Dam Database (GRanD) v1.3 → http://globaldamwatch.org/grand/

Version 1.1 of this dataset adds the 1901soc scenario with fixed year-1901 direct human influences.

Version 1.2 adds data for 2018-2021 and removes the separate lakemask files, since the lakemask can be calculated using pctlake and the grid area.

For ISIMIP participants, these files are available for download on the DKRZ cluster server using the path /work/bb0820/ISIMIP/ISIMIP3a/InputData/socioeconomic/lakes/*/pctlake_*.nc

For external users, these data can be downloaded from the ISIMIP Repository using the link below.