資料庫

Brief Description:

 

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).

 

Spatial Coverage:

0.25 degree latitude x 0.25 degree longitude global grid (1440x720).
-89.875S – 59.75N, 0.125E – 359.875E.

Levels:

Just one level.

Data Format:

NetCDF

 

 

Data variable and Path:

Historical: /archive/NEX-GDDP/historical 

RCP8.5: /archive/NEX-GDDP/rcp85 

Documentation:

https://cds.nccs.nasa.gov/wp-content/uploads/2015/06/NEX-GDDP_Tech_Note_v1_08June2015.pdf

Variable:

Variable Name

DESCRIPTION

Units

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

tasmax

daily mean of the daily-minimum near-surface air temperature

K

tasmin aily mean of the daily-maximum near-surface air temperature K

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