This is the reanalysis common grid data set produced as part of the SPARC (Stratosphere-troposphere Processes and their Role in Climate) Reanalysis Intercomparison Project (S-RIP). These data have been used in several chapters in the S-RIP report, including Chapter 4 (Overview of Ozone and Water Vapour - See Davis et al., ACP, 2017) and Chapter 8 (Tropical Tropopause Layer - See Tegtmeier et al., ACP, 2020). Notes about this data set: - Data set size: ~26 GB - Reanalyses included are CFSR, ERA-I, JRA-25, JRA-55, MERRA, MERRA-2 - Variables include T (variable name ta), u (ua), v (va), O3 (tro3), WV (hus), and GPH (zg) - Data are based off of the ana4mips data set - Data are on a 2.5° x 2.5° grid - All values are monthly means - Pressure levels are (1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10, 7, 5, 3, 2, 1, .7, .5, .3, .1 hPa) - 3 time periods are provided: - The “full” time period (different for each reanalysis) - The “S-RIP base period” (i.e., 197901-201312) - The “climatology” period (198101-201012) - Both 3D (lon,lat,level) and zonal mean 2D (lat, level) files are provided - Both timeseries and climatology data are provided. Files with “ltm” in the name are climatologies - Reanalysis “Ensemble” files are located in the /ensemble directory (See note below*) *Regarding the “ensemble” data — I highly recommend using the “ensemble” files in the “ensemble” folder for climatological intercomparisons. You can use a single file (e.g., hus_Amon_reanalysis_ENS_198101-201012.cg.ltm.nc for water vapor) that contains the climatologies for each reanalysis. The data in these files are of dimension (lon, lat, level,time(==12 months ), “record”), where record 0 = CFSR, 1=ERA-I, 2=JRA-25, 3=JRA-55, 4=MERRA, 5=MERRA2. There is also a corresponding “ensemble mean” file (e.g., hus_Amon_reanalysis_ENS_198101-201012.cg.ltm.ensmean.nc) that is simply the ensemble mean climatology from the 4 core reanalyses (CFSR, ERA-I, JRA-55, MERRA — EXCLUDING JRA-25 & MERRA2).