...
| ERA-Interim | ERA5 | |
|---|---|---|
| Period covered | 1979 - present | 1979 - present |
| Production Period | August 2006 – end 2018 | Jan 2016 – end 2017, then continued in near real-time |
| Assimilation system | IFS Cycle 31r2 4D-Var | IFS Cycle 41r2 4D-Var |
| Model input | As in operations (inconsistent SST) | Appropriate for climate (e.g. CMIP5 greenhouse gases, volcanic eruptions, SST and sea-ice cover) |
| Input observations | As in ERA-40 and from Global Telecommunication System | In addition, various newly reprocessed datasets and recent instruments that could not be ingested in ERA-Interim |
| Variational bias scheme | Satellite radiances | Also ozone, aircraft and surface pressure data |
| Satellite data | RTTOV-7, clear-sky, 1D-VAR rainy radiances | RTTOV-11, all-sky for various components |
| New parameters | tbd | |
| Parameters removed | tbd | |
| Handling of accumulated parameters | Accumulated from the beginning of the forecast | Accumulated from previous post-processing Does this mean from beginning of the Step? |
| Product main page | http://www.ecmwf.int/en/research/climate-reanalysis/era-interim | http://climate.copernicus.eu/climate-reanalysis |
| Technical documentation | Berrisford et al 2011: The ERA-Interim archive Version 2.0 | ERA5 data documentation (not yet...) |
| Additional innovations | Long-term evolution of CO2 in RTTOV, cell-pressure correction SSU, improved bias correction for radiosondes, EDA perturbations for sea-ice cover |
...