| |
|---|---|
| System name (version) | The First-Generation CMA Global Reanalysis (CMA-RA) |
| Date of implementation | December 2020 |
2. Configuration | |
|---|---|
Earth system components included in the analysis system (e.g., ocean, sea-ice, land, etc.) | Atmosphere and land |
Horizontal resolution of the model, with indication of grid spacing in km (for the different Earth system component included in the model) | Roughly 34km for both atmospheric and land component |
Number of levels in the different Earth system components (for the different Earth system component included in the model) | 64 levels for atmosphere, and 4 layers for land |
| Frequency of the outputs | 6-hourly |
| Top of the atmospheric model | 0.27 hPa |
| Number of analysis cycle per day | 4 |
| Earliest start date | 1st January 1979 |
| Integration time step | 900 seconds |
| Length and frequency of the longest forecast | 9-hour forecast 6-hourly |
| Dataset latency | 3-day for atmosphere and 1 week for land |
Additional comments:
IFS cycle 41r2 used.
| 3. Analysis system | |
| Data assimilation method | 3DVar with FGAT (First Guess at Appropriate Time) for atmosphere. EnOI for screen level analysis |
| Length of the analysis window | 6 hour |
| Number of ensemble members and their resolution | N/A |
Additional comments:
| 4. Externally prescribed boundary conditions and their source | |
| Sea surface temperature | Daily SST from CFSR for the period from 1979 to 2014. Daily Real-Time Global SST(RTG SST) for years from 2015 |
| Sea-ice | Daily sea ice from CFSR for the period from 1979 to 2014. Daily sea ice analysis from NCEP for years from 2015 |
| Snow | Weekly snow climatology for atmosphere model |
| Vegetation | MODIS-based vegetation type |
| Land use (and its evolution in time) | MODIS-based soil type |
| Aerosols | Monthly aerosols climatology |
| Green House Gases | observed variations in carbon dioxide (CO2) |
| Solar forcing | Annual solar constants |
Additional comments:
| 5. Details of model | |
| Dynamical core (e.g., semi-Lagrangian) | two time-level semi-implicit and semi-Lagrangian time discretization |
| Grid structure | Linear Gaussian grid with a resolution of T574 (~34km) |
| Hydrostatic or nonhydrostatic | Hydrostatic |
| Radiations parameterization | The rapid radiative transfer models (RRTMG) |
| Boundary layer parameterization | Hybrid eddy-diffusivity mass-flux PBL parameterization |
| Convection parameterization | Scale-aware parameterization |
| Cloud parameterization | Simple cloud microphysics parameterization |
| Land surface parameterization | The Noah land surface model |
Other relevant details:
Soil moisture DA: SEKF
Snow DA: 2D-OI
Radiative transfer model: RTTOVv11
Full details of cycle 41r2: Detailed information of implementation of IFS cycle 41r2
Detailed updated documentation on ERA5: ERA5: data documentation
| 6. Further information | |
| Operational contact point | Lipeng Jiang (jianglp@cma.gov.cn) |
| URL of the technical note/ reference paper | http://jmr.cmsjournal.net/en/article/doi/10.1007/s13351-023-2086-x |
| URL for list of products | https://data.cma.cn/en/?r=data/index&cid=713f77e85a7f95e8 |
| 7. Observational data used | |
| URL with the list of observational data used in the reanalysis | Section 3 of http://jmr.cmsjournal.net/en/article/doi/10.1007/s13351-023-2086-x |
| DOI of data product if available | 10.12065/2.C.GLB.2019.8.v1 |
Other sources for data access, if available