ISIMIP2a/ISIMIP3a: Monthly, 0.5° gridded data for 1860-2016.
ISIMIP2b: Annual and monthly, 0.5° gridded data for 1850-2099 derived from the average of three atmospheric chemistry models (i.e., GISS-E2-R, CCSM-CAM3.5, and GFDL-AM3) in the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) (0.5° x 0.5°).
ISIMIP2a: Gridded NHx and NOy deposition simulated by NCAR Chemistry-Climate Model Initiative (CCMI) during 1860-2014 at monthly time step. Nitrogen deposition data was interpolated to 0.5° by 0.5° by the nearest grid. Data in 2015 and 2016 are taken from 2014 as it is assumed to be same.
ISIMIP2b: GISS-E2-R provided monthly data; CCSM-CAM3.5 provided monthly data in each decade from 1850s to the 2000s; and GFDL-AM3 provided monthly data for 1850-1860, 1871-1950, 1961-1980, 1991-2000 and 2001-2010. Annual deposition rates calculated by aggregating the monthly data, and deposition rates in years without model output were calculated according to spline interpolation (CCSM-CAM3.5) or linear interpolation (for GFDL). The original deposition data was downscaled to spatial resolution of half degree (90° N to 90° S, 180° W to 180° E) by applying the nearest interpolation.
ISIMIP3a: Gridded NHx and NOy deposition simulated by NCAR Chemistry-Climate Model Initiative (CCMI) during 1860-2014 at monthly time step. Nitrogen deposition data was interpolated to 0.5° by 0.5° by the nearest grid. Data in 2015 and 2016 are taken from 2014 as it is assumed to be same (Tian et al. 2018). Observation data is provided in the histsoc/ folder. Fixed year-2015 direct human influences are provided in the 2015soc/ folder.
For ISIMIP participants, these files are available for download on the DKRZ server using the path
For external users, these data is made available on the ISIMIP ESGF server (https://esg.pik-potsdam.de/projects/isimip/). They are also available via an rsync facility (described here: https://www.isimip.org/gettingstarted/data-access/#for-external-non-participant-users), for which the password will be provided upon request (email@example.com).