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README: add ERA5 section

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license: cc-by-4.0
pretty_name: CICE Consortium input data (mirror)
tags:
  - sea-ice
  - CICE
  - climate
  - forcing

CICE Consortium input data (mirror)

This is an unofficial mirror of the input data for the CICE sea ice model, as listed on the official CICE Input Data wiki page. All data are produced and published by the CICE Consortium on Zenodo. Files are the original, unmodified .tar.gz archives (not unpacked); MD5 checksums were verified against Zenodo.

Official statement: these data are provided for testing the code only. They are not meant to be used for publishing scientific results.

Item	Directory	Zenodo record	DOI	License
gx3 grid + initial conditions (CICE gx3 grid and initial condition files. 2023.10.27)	`gx3/`	10048023	10.5281/zenodo.10048023	CC-BY-4.0
gx3 JRA55do forcing (CICE gx3 JRA55do Forcing Data - 2023.07.03)	`gx3/`	8117763	10.5281/zenodo.8117763	CC-BY-4.0
gx3 JRA55 forcing (CICE gx3 JRA55 Forcing Data - 2020.03.20)	`gx3/`	3728364	10.5281/zenodo.3728364	CC-BY-4.0
gx3 WW3 forcing (CICE gx3 WW3 Forcing Data - 2020.03.20)	`gx3/`	3728360	10.5281/zenodo.3728360	CC-BY-4.0
gx3 NCAR_bulk forcing (CICE gx3 NCAR_bulk Forcing Data - 2020.03.20)	`gx3/`	3728362	10.5281/zenodo.3728362	CC-BY-4.0
gx1 grid + initial conditions (CICE gx1 Grid and Initial Condition Data - 2021.08.16)	`gx1/`	5208241	10.5281/zenodo.5208241	CC-BY-4.0
gx1 JRA55do forcing by year (CICE gx1 JRA55do Forcing Data by year - 2023.07.03)	`gx1/`	8118062	10.5281/zenodo.8118062	CC-BY-4.0
gx1 JRA55 forcing by year (CICE JRA55 gx1 forcing by year. 2020.03.20)	`gx1/`	8118239	10.5281/zenodo.4601646	CC-BY-4.0
gx1 WOA forcing (CICE gx1 WOA Forcing Data - 2020.03.20)	`gx1/`	3728600	10.5281/zenodo.3728600	CC-BY-4.0
gx1 COREII forcing (deprecated) (CICE gx1 COREII Forcing Data - 2020.03.20)	`gx1/`	3731012	10.5281/zenodo.3731012	CC-BY-4.0
CESM slab ocean forcing gx1 (CESM climatological 2D ocean forcing gx1 2021.04.02)	`gx1/`	4660188	10.5281/zenodo.4660188	CC-BY-4.0
tx1 grid + initial conditions (CICE tx1 grid and initial condition files. 2020.05.12)	`tx1/`	4670721	10.5281/zenodo.4670721	CC-BY-4.0
tx1 JRA55do forcing by year (CICE tx1 JRA55do Forcing Data by year - 2023.07.03)	`tx1/`	8118183	10.5281/zenodo.8118183	CC-BY-4.0
tx1 JRA55 forcing by year (CICE JRA55 Forcing on tx1 grid by year. 2023-09-19)	`tx1/`	10045026	10.5281/zenodo.10045026	CC-BY-4.0
tx1m grid (CICE tx1m grid files. 2026.10.01)	`tx1m/`	23074022	10.5281/zenodo.23074022	CC-BY-4.0
tx1m JRA55do 2005 (CICE JRA55do forcing on tx1m grid. 2026.10.01)	`tx1m/`	23074421	10.5281/zenodo.23074421	CC-BY-4.0
SNICAR optics (SNICAR related forcings for CICE/Icepack 2021.01.21)	`snicar/`	5208209	10.5281/zenodo.5208209	CC-BY-4.0
gx1 50-year forcing generation scripts (optional)	`optional/`	—	ftp://ftp.cgd.ucar.edu/archive/Model-Data/CICE/gx1_50yr_scrip.tar.gz	not specified (NCAR/UCAR public FTP)

Not mirrored: the gx1 and tx1 JRA55 multi-year tar files (Zenodo 3731014, 10044769); they contain the same data as the per-year files included here.

Directory layout

Mirrors the CICE_data/ grid organisation. Unpack each archive inside your CICE_data/ directory (tar xzf <file>), as described in the wiki.

gx3/ – 3° displaced-pole grid: grid + initial conditions, JRA55do, JRA55, WW3, NCAR_bulk forcing
gx1/ – 1° displaced-pole grid: grid + IC (3 versions: 20210319, 20210402, 20210816 — the wiki points at the latest), JRA55do and JRA55 by year (2005–2009), WOA, COREII (deprecated), CESM slab-ocean forcing (two versions)
tx1/ – 1° tripole grid: grid + IC, JRA55do and JRA55 by year (2005–2009)
tx1m/ – tx1m grid and JRA55do 2005 forcing
snicar/ – SNICAR snow optical-property tables
optional/ – optional 50-year gx1 forcing scripts
manifest.csv – path, size, md5, source DOI/URL, verification status for every file

Citation

Please cite the Zenodo DOIs above and the CICE Consortium. For the atmospheric forcing:

JRA55: Kobayashi, S., et al. (2015). The JRA-55 Reanalysis: General specifications and basic characteristics. J. Meteor. Soc. Japan, 93(1), 5–48. https://doi.org/10.2151/jmsj.2015-001
JRA55-do: Tsujino, H., et al. (2018). JRA-55 based surface dataset for driving ocean–sea-ice models (JRA55-do). Ocean Modelling, 130, 79–139. https://doi.org/10.1016/j.ocemod.2018.07.002

ERA5 surface forcing (`ERA5/`)

Hourly ERA5 single-level reanalysis fields, added alongside the CICE data for building custom atmospheric forcing.

Source: Copernicus Climate Change Service (C3S), ERA5 hourly data on single levels from 1940 to present (reanalysis-era5-single-levels), downloaded from the Climate Data Store. Files are unmodified CDS output.
Period: 2005-01 – 2009-12, all hours, global 0.25° grid, one NetCDF file per month: ERA5/<year>/era5_sl_<YYYYMM>.nc (kept as .zip if CDS delivered a zip).
Variables: 10m_u_component_of_wind, 10m_v_component_of_wind, 2m_temperature, 2m_dewpoint_temperature, total_precipitation, snowfall, surface_solar_radiation_downwards, surface_thermal_radiation_downwards, mean_sea_level_pressure, surface_pressure.
Manifest: ERA5/manifest.csv (path, size, md5, time steps).
License: CC-BY 4.0. Contains modified Copernicus Climate Change Service information [2026]. Neither the European Commission nor ECMWF is responsible for any use of this information.
Citation: Hersbach, H., et al. (2020). The ERA5 global reanalysis. Q. J. R. Meteorol. Soc., 146, 1999–2049. https://doi.org/10.1002/qj.3803

CICE Consortium input data (mirror)

Contents

Directory layout

Citation

ERA5 surface forcing (ERA5/)

ERA5 surface forcing (`ERA5/`)