ERA5 deterministic? ensemble included?
System
| System name (version) | ERA5 |
| Date of implementation | 2016 |
41r2 (2016)
Configuration
Earth system components included in the analysis system (e.g., ocean, sea-ice, land, etc.) | |
Horizontal resolution of the model, with indication of grid spacing in km (for the different Earth system component included in the model) | TL639, 31 km atmosphere 0.36o ocean waves |
Number of levels in the different Earth system components (for the different Earth system component included in the model) | 137 levels in the atmosphere |
| Frequency of the outputs | 1-hourly |
| Top of the atmospheric model | 1 Pa |
| Number of analysis cycle per day | 2 |
| Earliest start date | 1 January 1940 |
| Integration time step | |
| Length and frequency of the longest forecast | |
| Dataset latency | ERA5T 5 days behind real time (preliminary product) ERA5 2–3 months (final product) |
Additional comments:
Analysis system
| Data assimilation method | 4D-Var |
| Length of the analysis window | 12 hours |
| Number of ensemble members and their resolution |
Additional comments:
Externally prescribed boundary conditions
Note: Briefly describe boundary conditions (if used) and their source:
| Sea surface temperature | January 1949–December 1960, HadISST2.1.0.0 (monthly), 0.25 x 0.25 January 1961–August 2007, HadISST2.1.1.0 (pentad), 0.25 x 0.25 September 2007 onwards, OSTIA, 0.05 x 0.05 |
| Sea-ice | January 1949–December 1960, HadISST2.0.0.0, 0.25 x 0.25 January 1961–December 1978, HadISST2.0.0.0, 0.25 x 0.25 January 1979–August 2007, OSI SAF (409a), 0.25 x 0.25 September 2007 onwards, OSI SAF oper 0.05 x 0.05 |
| Snow | |
| Vegetation | |
| Land use (and its evolution in time) | |
| Aerosols | |
| Green House Gases | |
| Solar forcing |
Additional comments:
Details of model
| Dynamical core (e.g., semi-Lagrangian) | |
| Grid structure | TL639 |
| Hydrostatic or nonhydrostatic | |
| Radiations parameterization | |
| Boundary layer parameterization | |
| Convection parameterization | |
| Cloud parameterization | |
| Land surface parameterization | HTESSEL |
Other relevant details:
Soil moisture DA: SEKF
Snow DA: 2D-OI
Radiative transfer model: RTTOVv11
Further information
| Operational contact point | |
| URL of the technical note/ reference paper | Hersbach et al. (2020) https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/qj.3803 DOI: 10.1002/qj.3803 |
| URL for list of products |
Observational data used
| URL with the list of observational data used in the reanalysis | |
| DOI of data product if available |
Other sources for data access, if available