CHELSA_v1.1 (http://chelsa-climate.org/) is a high resolution (30 arc sec, ~1 km) climate data set for the earth land surface areas. It includes monthly and annual mean temperature and precipitation patterns as well as derived bioclimatic and interannual parameters for the time period 1979-2013. CHELSA_v1.1 is based on a quasi-mechanistical statistical downscaling of the ERA interim global circulation model (http://www.ecmwf.int/en/research/climate-reanalysis/era-interim) with a GPCC (https://www.dwd.de/EN/ourservices/gpcc/gpcc.html) and GHCN (https://www.ncdc.noaa.gov/ghcnm/) bias correction.

CHELSA_v1.0 (http://chelsa-climate.org/) is a high resolution (30 arc sec, ~1 km) climate data set for the earth land surface areas. Version 1.0 is a first release. It includes monthly and annual mean temperature and precipitation patterns for the time period 1979-2013. CHELSA_v1 is based on a quasi-mechanistical statistical downscaling of the ERA interim global circulation model (http://www.ecmwf.int/en/research/climate-reanalysis/era-interim) with a GPCC (https://www.dwd.de/EN/ourservices/gpcc/gpcc.html) and GHCN (https://www.ncdc.noaa.gov/ghcnm/) bias correction. Specifications: High resolution (30 arcsec, ~1 km) Precipitation & Temperature Monthly coverage 1979 - 2013 Incorporation of topoclimate (e.g. orographic rainfall & wind fields). Downscaled ERA-interim model. Allows calculation of derived parameters based on monthly values such as length of dry periods etc.

The HEXQ98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (Q): 144 hours forecast T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 144 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

The HEXF98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (F): 30 hours forecast T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 30 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

The HEXW98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (W): Not assigned T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 54 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

The HEXM98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (M): 96 hours forecast T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 96 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

The HEXI98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (I): 48 hours forecast T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 48 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

The HEXB98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (B): 6 hours forecast T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 06 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

The HEXA98 TTAAii Data Designators decode as: T1 (H): Grid point information (GRIB) T1T2 (HE): Precipitation A1 (X): Global Area (area not definable) A2 (A): Analysis (00 hour) T1ii (H98): Air priorities for the Earth's surface (Remarks from Volume-C: H+ 00 (GLOBAL MODEL) ACCUMULATED PRECIPITATION)

These data are made available as part of paper: S. J. Gonzalez-Roji, J. Saenz, G. Ibarra-Berastegi, J. Diaz de Argandona (2018) Moisture balance over the Iberian Peninsula according to a regional climate model, Journal of Geophysical Research 123(2):708-729. The dataset holds selected postprocessed files that allow to reproduce all the results in the paper. An analysis of the atmospheric branch of the hydrological cycle by means of a 15 km resolution numerical integration performed using Weather Research and Forecasting (WRF) nested in ERA Interim is presented. Two WRF experiments covering the period 2010–2014 were prepared. The first one (N) was configured as in standard numerical downscaling experiments. The second one (D), with the same parameterizations, included a step of 3DVAR data assimilation every 6 h. Experiment D: -windowed-D-AI: Analysis increments (T2, Q2), 2010-2014 for the D experiment -windowed-wavacurip4paper-D: Netcdf files corresponding to experiment D (using 3DVAR assimilation) and years 2010-2014 holding 3-hourly outputs from the run after selecting the window covering the Iberian Peninsula. Experiment N: -windowed-wavacurip4paper-N: Netcdf files corresponding to experiment N (no data assimilation) and years 2010-2014 holding 3-hourly outputs from the run after selecting the window covering the Iberian Peninsula