xcdat-data

This repository exists to hold resource and example datasets for xcdat (e.g., as used in the documentation) that would bloat the main repository if included there.

Available Example Datasets

Key	Filename	Description	Subset	Approx. Filesize
pr_amon_access	pr_Amon_ACCESS-ESM1-5_historical_r10i1p1f1_gn_185001-201412_subset.nc	Monthly precipitation data from the ACCESS-ESM1-5 model.	1870-01-01 to 1874-12-31	7 MB
tas_amon_access	tas_Amon_ACCESS-ESM1-5_historical_r10i1p1f1_gn_185001-201412_subset.nc	Monthly near-surface air temperature from ACCESS-ESM1-5.	1870-01-01 to 1874-12-31	7 MB
tas_3hr_access	tas_3hr_ACCESS-ESM1-5_historical_r10i1p1f1_gn_201001010300-201501010000_subset.nc	3-hourly near-surface air temperature from ACCESS-ESM1-5.	Lat and lon points (15, 45)	25 MB
tas_amon_canesm5	tas_Amon_CanESM5_historical_r13i1p1f1_gn_185001-201412_subset.nc	Monthly near-surface air temperature from the CanESM5 model.	1870-01-01 to 1874-12-31	2.0 MB
so_omon_cesm2	so_Omon_CESM2_historical_r1i1p1f1_gn_185001-201412_subset.nc	Monthly ocean salinity data from the CESM2 model.	First three time points	29 MB
thetao_omon_cesm2	thetao_Omon_CESM2_historical_r1i1p1f1_gn_185001-201412_subset.nc	Monthly ocean potential temperature from the CESM2 model.	First three time points	37 MB
cl_amon_e3sm2	cl_Amon_E3SM-2-0_historical_r1i1p1f1_gr_185001-189912_subset.nc	Monthly cloud fraction data from the E3SM-2-0 model.	1870-01-01 to 1874-12-31	54 MB
ta_amon_e3sm2	ta_Amon_E3SM-2-0_historical_r1i1p1f1_gr_185001-189912_subset.nc	Monthly air temperature data from the E3SM-2-0 model.	1870-01-01 to 1874-12-31	14 MB

Available Resource Datasets

Key	Filename	Description	Subset	Approx. Filesize
navy_land	resources/navy_land.nc	Navy land mask dataset. The navy_land.nc file is used as the high-resolution land-sea mask. This file is sourced from the PCMDI (Program for Climate Model Diagnosis and Intercomparison) Metrics Package. It is a fixed asset (not expected to change) and is available at: https://github.com/PCMDI/pcmdi_metrics/blob/main/share/data/navy_land.nc	Global	8.97 MB
kerchunk_list	resources/kerchunk_list.json	Kerchunk catalog of CMIP6 dataset references for remote-data demonstrations.	N/A	50 MB
ecsdata	resources/ecsdata.json	Equilibrium climate sensitivity (ECS) metadata for CMIP6 models.	53 models	2 KB

CWSS 2026 Remote Kerchunk Demo

resources/kerchunk_list.json is a ~50 MB snapshot of Kerchunk metadata used by xCDAT's CWSS companion notebook. It is stored in xcdat-data rather than xcdat to avoid bloating the xCDAT source repository. The catalog identifies remote CMIP6 Kerchunk reference JSON files for the demo's historical monthly tas analysis. See the companion Google Slides presentation.

Consumers should access this file through a pinned xcdat-data release tag or commit SHA, not an unpinned branch URL.

resources/ecsdata.json supplies the companion ECS metadata for the xCDAT CWSS remote-Kerchunk demo. Its values are Gregory-regression ECS estimates from the CMIP6 abrupt-4xCO2 and piControl simulations, calculated using the PCMDI Metrics Package ECS implementation. The JSON schema is {model_name: ecs_value}, where each model name is a string and each ECS value is a numeric value in K.

Usage

To access these datasets, simply import the tutorial open_dataset() function and specify the key of the file to open.

from xcdat.tutorial import open_dataset

# Specify the key
ds = open_dataset("pr_amon_access")