// NASA Earth Exchange Global Daily Downscaled Projections (NEX-GDDP-CMIP6)

The NEX-GDDP-CMIP6 dataset is comprised of global downscaled climate scenarios derived from the General Circulation Model (GCM) runs conducted under the Coupled Model Intercomparison Project Phase 6 (CMIP6) and across all four “Tier 1” greenhouse gas emissions scenarios known as Shared Socioeconomic Pathways (SSPs). The CMIP6 GCM runs were developed in support of the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR6). This dataset includes downscaled projections from ScenarioMIP model runs for which daily scenarios were produced and distributed through the Earth System Grid Federation. The purpose of this dataset is to provide a set of global, high resolution, bias-corrected climate change projections that can be used to evaluate climate change impacts on processes that are sensitive to finer-scale climate gradients and the effects of local topography on climate conditions.

Users are encouraged to review the technote, provided alongside the data set, where more detailed information, references and acknowledgements can be found.

Tech Note

Data Access

Data Service Name: Amazon Web Services (AWS) Simple Storage Service (S3)
Dataset Entry: https://registry.opendata.aws/nex-gddp-cmip6/
Data Access URL:

s3://nex-gddp-cmip6

Data Service Name: NCCS THREDDS
Data Service Information: Search, Subset, Download, Visualize
Data Service Access URL:

NCCS THREDDS NEX-GDDP-CMIP6

Making a Spatial Subset
Browse for your dataset at our THREDDS entry point. For example, under NEX-GDDP-CMIP6 for model ACCESS-CM2, a historical run of variable pr (precipitation) from the year 2014 yields the URL: https://ds.nccs.nasa.gov/thredds/catalog/AMES/NEX/GDDP-CMIP6/ACCESS-CM2/historical/r1i1p1f1/pr/catalog.html?dataset=AMES/NEX/GDDP-CMIP6/ACCESS-CM2/historical/r1i1p1f1/pr/pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc (To reproduce this URL, follow the path GDDP-CMIP6/ACCESS-CM2/historical/r1i1p1f1/pr/, then select the year.)

Under "Access", select option 3, NetcdfSubset.

Now you must select your variables:

  • Check the box "pr" (for precipitation).
  • Uncheck "Disable Horizontal Subsetting" in both the "Lat/lon subset" and the "Coordinate subset" tabs.
  • Enter your lat_min, lat_max, lon_min, and lon_max.
  • You may also need to check "Add Lat/Lon variables" at the bottom.

Once your variables are configured, you can copy the "NCCS Request URL" at the bottom into your scripts; for example, using wget for a subset of this dataset in the DC area:
wget "https://ds.nccs.nasa.gov/thredds/ncss/grid/AMES/NEX/GDDP-CMIP6/ACCESS-CM2/historical/r1i1p1f1/pr/pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc?var=pr&north=39&west=-77&east=76&south=38.7&horizStride=1&time_start=2014-01-01T12:00:00Z&time_end=2014-12-31T12:00:00Z&&&accept=netcdf3&addLatLon=true"

Note: When using wget, you must put quotations ("") around the URL.

Contact

Dr. Bridget Thrasher and Dr. Ian Brosnan, NASA NEX
Website: NASA NEX
Data Support Contact: NCCS Support

Summary

Short Name: NEX-GDDP-CMIP6
Version: 1.0, 1.1, and 1.2
Format: netCDF4

Coverage:
West Bounding Coordinate: 180° W
East Bounding Coordinate: 180° E
North Bounding Coordinate: 90° N
South Bounding Coordinate: 60° S

Data Resolution:
Latitude Resolution: 0.25 degrees (25 km)
Longitude Resolution: 0.25 degrees (25 km)
Temporal Resolution: daily

Total Dataset Size: 38 TB