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

The NASA Earth Exchange Global Daily Downscaled Projections (NEX-GDDP) dataset is comprised of downscaled climate scenarios for the globe that are derived from the General Circulation Model (GCM) runs conducted under the Coupled Model Intercomparison Project Phase 5 (CMIP5) and across two of the four greenhouse gas emissions scenarios known as Representative Concentration Pathways (RCPs). The CMIP5 GCM runs were developed in support of the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC AR5). The NEX-GDDP dataset includes downscaled projections for RCP 4.5 and RCP 8.5 from the 21 models and scenarios for which daily scenarios were produced and distributed under CMIP5. Each of the climate projections includes daily maximum temperature, minimum temperature, and precipitation for the periods from 1950 through 2100. The spatial resolution of the dataset is 0.25 degrees (~25 km x 25 km). The NEX-GDDP dataset is provided to assist the science community in conducting studies of climate change impacts at local to regional scales, and to enhance public understanding of possible future global climate patterns at the spatial scale of individual towns, cities, and watersheds.

Each of the climate projections includes monthly averaged maximum temperature, minimum temperature, and precipitation for the periods from 1950 through 2005 (Retrospective Run) and from 2006 to 2099 (Prospective Run).

Data Access

Data Service Name: NCCS THREDDS
Data Service Information: Search, Subset, Download, Visualize
  (Helpful hint for scripts, e.g. wget - Use the url at the bottom of the NetCDFSubset page)
Data Service Access URL: NCCS THREDDS
Select Project "NEX".
Note, a problem with the date representation of noleap year calendar data in WMS and Godiva has been discovered. The developer is working on a fix. The data is not affected, just the visualization tools.

Data Service Name: NCCS FTP
Data Service Information: Download
  (Useful for downloading large amounts of data)
Data Service Access URL: NCCS FTP
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Contact

Bridget Thrasher/Forrest Melton/Weile Wang NASA NEX
Website: NASA NEX
Data Support Contact: NCCS Support

Summary

Short Name: NEX-GDDP
Version: 1
Format: netCDF4 classic

Spatial Coverage: Global
Temporal Coverage: 1950 - 2005 historical or 2006 - 2099 RCP

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

Total Dataset Size: 12 TB
Individual files size: 750 MB

Documentation

NEX-GDDP_Tech_Note

Variable Description Units
tasmin daily mean of the daily-minimum near-surface air temperature K
tasmax daily mean of the daily-maximum near-surface air temperature K
precipitation daily mean of precipitation at surface; includes both liquid and solid phases from all types of clouds (both large-scale and convective) kg m-2 s-1