| --- |
| license: cc-by-4.0 |
| pretty_name: jax-gcm boundary conditions and emissions |
| tags: |
| - climate |
| - atmospheric-science |
| - emissions |
| - boundary-conditions |
| --- |
| |
| # jax-gcm boundary conditions and emissions |
|
|
| Input data for [jax-gcm](https://github.com/climate-analytics-lab/jax-gcm) |
| (`jcm`), a fully differentiable atmospheric GCM in JAX. Two tiers: |
|
|
| ## `products/` — grid-independent source products |
|
|
| | store | contents | source | |
| |---|---|---| |
| | `ceds_anthro.zarr` | anthropogenic SO2/BC/OC/NH3 flux, sector-summed, 0.5°, monthly 1850–2023 + PI (1850–59) / PD (2005–14) climatologies | CEDS-CMIP-2025-04-18 (input4MIPs CMIP7) | |
| | `bb4cmip7.zarr` | open-burning SO2/BC/OC/NH3 flux, 0.25°, monthly 1850–2023 + PI/PD climatologies | DRES-CMIP-BB4CMIP7-2-0 | |
| | `era5_land_climo_2005-2014_0p25.nc` | skin/soil temperature, 3-layer soil water, snow depth, albedo, land-sea mask, 0.25° | ERA5 (NCAR RDA d633001) | |
| | `sso/sso_gmted2010_*.nc` | Lott & Miller (1997) subgrid-orography statistics from the 30″ GMTED2010 DEM | USGS GMTED2010 | |
|
|
| All fluxes are kg m⁻² s⁻¹. Regridding always starts from these — never |
| from an already-regridded bundle. |
|
|
| ## `bundles/` — per-grid, ready for the model |
|
|
| For each grid (`t63` 96×192, `t106` 160×320 Gaussian; `ne30pg3` |
| native columns), the files `jcm.Model` reads directly: |
|
|
| - `terrain.nc` — orography + land-sea mask + six SSO fields |
| (jcm-canonical layout) |
| - `forcing_{pi,pd}.nc` — 12-month SST/sea-ice (PCMDI-AMIP-1-1-10) + |
| ERA5 land-surface climatology. **PI SST/ice is the 1870–1879 mean**, |
| the earliest observed decade — no observational 1850 SST exists. |
| - `emissions_{pi,pd}.nc` — per-super-sector surface flux |
| (`surface_combustion`, `biomass_burning`) × (SO2, BC, OC) |
| - `dms.nc`, `dust.nc` — Lana et al. (2011) seawater DMS; CAM dust |
| erodibility |
| - `<grid>_l{47,95}/ozone_{pi,pd}.nc` — FZJ-CMIP-ozone-1-0 pre-interpolated |
| to the ECHAM hybrid levels |
| - `<grid>_l{47,95}/oxidants_{1850,2014}.nc` — CAM OH/NO3/O3/H2O2 |
| (L26 source, clamped above the CAM lid) |
|
|
| ## Usage |
|
|
| ```python |
| from jcm.data.remote import bundle_file |
| terrain = bundle_file("t63", "terrain.nc") |
| ozone = bundle_file("t63_l47", "ozone_pd.nc") |
| ``` |
|
|
| `registry.json` lists every file with size and sha256. |
|
|
| ## Licences and provenance |
|
|
| Emissions, ozone and SST/sea-ice derive from CMIP7 input4MIPs products |
| (CC-BY-4.0). ERA5 derivatives are provided under the Copernicus licence |
| terms. GMTED2010 is a public-domain USGS product. See each file's |
| attributes for the exact source path and processing history. |
|
|
