NASA NEX-GDDP-CMIP6 Climate Dataset (nex-gddp-cmip6)
In this file, the details of the dataset is explained.
Location of Dataset Files
The nex-gddp-cmip6 dataset is located under the following
directory(s) accessible from multiple clusters:
# DRAC Graham HPC location
/project/rpp-kshook/Climate_Forcing_Data/meteorological-data/nasa-nex-gddp-cmip6 # rpp-kshook allocation
# UCalgary ARC HPC location
/work/comphyd_lab/data/meteorological-data/nasa-nex-gddp-cmip6 # comphyd_lab location
# Perdue University Anvil HPC location
/anvil/datasets/meteorological/NASA_NEX-GDDP-CMIP6
and the structure of the dataset’s yearly files (containing daily time-steps) is as following:
/project/rrg-mclark/data/meteorological-data/nasa-nex-gddp-cmip6/NEX-GDDP-CMIP6/
├── ACCESS-CM2
│ ├── historical
│ │ └── r1i1p1f1
│ │ ├── hurs
│ │ │ ├── hurs_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
| | | ├── hurs_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950_v1.1.nc
│ │ │ ├── hurs_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
│ │ │ ├── hurs_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951_v1.1.nc
│ │ │ ├── .
│ │ │ ├── .
│ │ │ ├── .
│ | │ ├── hurs_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
│ | │ └── hurs_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014_v1.1.nc
│ | ├── huss
│ | | ├── huss_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | | ├── huss_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | | ├── huss_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | | ├── .
| | | ├── .
| | | ├── .
| | | ├── huss_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | | └── huss_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
| | ├── pr
│ | | ├── pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | | ├── pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | | ├── pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | | ├── .
| | | ├── .
| | | ├── .
| | | ├── pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | | └── pr_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
| | ├── rlds
│ | | ├── rlds_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | | ├── rlds_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | | ├── rlds_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | | ├── .
| | | ├── .
| | | ├── .
| | | ├── rlds_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | | └── rlds_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
| | ├── rsds
│ | | ├── rsds_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | | ├── rsds_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | | ├── rsds_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | | ├── .
| | | ├── .
| | | ├── .
| | | ├── rsds_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | | └── rsds_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
| | ├── tas
│ | | ├── tas_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | | ├── tas_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | | ├── tas_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | | ├── .
| | | ├── .
| | | ├── .
| | | ├── tas_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | | └── tas_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
| | ├── tasmax
│ | | ├── tasmax_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | | ├── tasmax_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | | ├── tasmax_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | | ├── .
| | | ├── .
| | | ├── .
| | | ├── tasmax_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | | └── tasmax_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
| | └── tasmin
│ | ├── tasmin_day_ACCESS-CM2_historical_r1i1p1f1_gn_1950.nc
│ | ├── tasmin_day_ACCESS-CM2_historical_r1i1p1f1_gn_1951.nc
| | ├── tasmin_day_ACCESS-CM2_historical_r1i1p1f1_gn_1952.nc
| | ├── .
| | ├── .
| | ├── .
| | ├── tasmin_day_ACCESS-CM2_historical_r1i1p1f1_gn_2013.nc
| | └── tasmin_day_ACCESS-CM2_historical_r1i1p1f1_gn_2014.nc
│ ├── ssp126
│ | └── r1i1p1f1
│ | ├── hurs
│ | | ├── hurs_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2015.nc
│ | | ├── hurs_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2015_v1.1.nc
│ | | ├── .
│ | | ├── .
│ | | ├── .
│ | | ├── hurs_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2100.nc
│ | | └── hurs_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2100_v1.1.nc
| | .
| | .
| | .
| | └── tasmin
| | ├── tasmin_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2015.nc
| | ├── tasmin_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2016.nc
| | ├── .
| | ├── .
| | ├── .
| | └── tasmin_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2100.nc
| .
| .
| .
| ├── %{scenario}
| ├── %{ensemble}
| . . ├── %{var}
| . . . ├── %{var}_day_ACCESS-CM2_%{scenario}_%{ensemble}_gn_%{year}%{version}.nc
| . . . .
| . . . .
| . . . .
| └── ssp585
│ └── r1i1p1f1
│ ├── hurs
│ | ├── hurs_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2015.nc
│ | ├── .
│ | ├── .
│ | ├── .
│ | └── hurs_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2100.nc
| .
| .
| .
| └── tasmin
| ├── tasmin_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2015.nc
| ├── .
| ├── .
| ├── .
| └── tasmin_day_ACCESS-CM2_ssp126_r1i1p1f1_gn_2100.nc
.
. .
. .
├── %{model}
. ├── %{scenario}
. . └── %{ensemble}
. . ├── %{var}
. . . ├── %{var}_day_%{model}_%{scenario}_%{ensemble}_gn_%{year}%{version}.nc
. . . .
. . . .
. . . .
└── UKESM1-0-LL
├── historical
| └── r1i1p1f2
| ├── hurs
| | ├── hurs_day_UKESM1-0-LL_historical_r1i1p1f2_gn_1950.nc
| | ├── hurs_day_UKESM1-0-LL_historical_r1i1p1f2_gn_1950_v1.1.nc
| | ├── .
| | ├── .
| | ├── .
| | ├── hurs_day_UKESM1-0-LL_historical_r1i1p1f2_gn_2014.nc
| | └── hurs_day_UKESM1-0-LL_historical_r1i1p1f2_gn_2014_v1.1.nc
| . .
| . .
| . .
| └── tasmin
| .
| .
| └── tasmin_day_UKESM1-0-LL_historical_r1i1p1f2_gn_2014.nc
.
.
.
└── ssp585
└── r1i1p1f2
├── hurs
| ├── hurs_day_UKESM1-0-LL_ssp585_r1i1p1f2_gn_2015.nc
| ├── .
| ├── .
| ├── .
| └── hurs_day_UKESM1-0-LL_ssp585_r1i1p1f2_gn_2100.nc
.
.
.
└── tasmin
├── tasmin_day_UKESM1-0-LL_ssp585_r1i1p1f2_gn_2015.nc
.
.
.
└── tasmin_day_UKESM1-0-LL_ssp585_r1i1p1f2_gn_2100.nc
[!important] Not all models have the same number of scenarios, enesmble members, and variables. Each individual model needs to be investigate individually.
[!caution] Currently,
datatoolis NOT capable of identifying various versions of dataset files. In this dataset, as can be observed files forv1.1(those indicated with a_v1.1_in their file names) are ignored. This will be addressed in the future versions.
nex-gddp-cmip6 Climate Models
This dataset offers downscaled outputs of various climate models. Table
below summarizes the models and relevant keywords that could be used
with the main datatool script:
# |
Model (keyword for
|
Scenarios (keyword for |
|---|---|---|
1 |
|
|
2 |
|
|
3 |
|
|
4 |
|
|
5 |
|
|
6 |
|
|
7 |
|
|
8 |
|
|
9 |
|
|
1 0 |
|
|
1 1 |
|
|
1 2 |
|
|
1 3 |
|
|
1 4 |
|
|
1 5 |
|
|
1 6 |
|
|
1 7 |
|
|
1 8 |
|
|
1 9 |
|
|
2 0 |
|
|
2 1 |
|
|
2 2 |
|
|
2 3 |
|
|
2 4 |
|
|
2 5 |
|
|
2 6 |
|
|
2 7 |
|
|
2 8 |
|
|
2 9 |
|
|
3 0 |
|
|
3 1 |
|
|
3 2 |
|
|
3 3 |
|
|
3 4 |
|
|
3 5 |
|
|
nex-gddp-cmip6 Climate Models’ Ensemble Members
This dataset offers downscaled outputs of various climate models. Table below summarizes the dataset ensemble members for each climate model:
# |
Model (keyword for
|
Ensemble Member(s) (keyword for
|
|---|---|---|
1 |
|
|
2 |
|
|
3 |
|
|
4 |
|
|
5 |
|
|
6 |
|
|
7 |
|
|
8 |
|
|
9 |
|
|
1 0 |
|
|
1 1 |
|
|
1 2 |
|
|
1 3 |
|
|
1 4 |
|
|
1 5 |
|
|
1 6 |
|
|
1 7 |
|
|
1 8 |
|
|
1 9 |
|
|
2 0 |
|
|
2 1 |
|
|
2 2 |
|
|
2 3 |
|
|
2 4 |
|
|
2 5 |
|
|
2 6 |
|
|
2 7 |
|
|
2 8 |
|
|
2 9 |
|
|
3 0 |
|
|
3 1 |
|
|
3 2 |
|
|
3 3 |
|
|
3 4 |
|
|
3 5 |
|
|
Coordinate Variables, Spatial and Temporal extents, and Time-stamps
Coordinate Variables
The coordinate variables of the nex-gddp-cmip6 climate dataset files
are rlon and rlat representing the longitude and latitude
points, respectively.
Temporal Extents and Time-stamps
The time-stamps are already included in the original files. The dataset offers daily time-series of climate variables. The following table describes the temporal extent for senarios included in this dataset:
# |
Scenarios (keyword for |
Temporal extent |
|---|---|---|
1 |
|
|
2 |
|
|
3 |
|
|
4 |
|
|
5 |
|
|
Note
Values of the Temporal extent column are the limits for
--start-date and --end-date options with the main
datatool script.
Dataset Variables
The NetCDF files of the dataset contain various variables. You may see a list of variables by browsing the dataset’s directory:
foo@bar:~$ ls /project/rrg-mclark/data/meteorological-data/nasa-nex-gddp-cmip6/NEX-GDDP-CMIP6/ACCESS-CM2/ssp126/r1i1p1f1/
hurs huss pr rlds rsds sfcWind tas tasmax tasmin
Spatial Extent
The nex-gddp-cmip6 dataset spatial extent is global.
Short Description on nex-gddp-cmip6 Climate Dataset Variables
This dataset offers 9 climate variables: 1) precipitation, 2) mean air temperature, 3) daily maximum temperature, 4) daily minimum temperature, 5) specific humidity, 6) relative humidity, 7) shortwave radiation, 8) longwave radiation, and 9) wind speed.
Since the frequency of this dataset is daily, including daily time-series of precipitation and air temperature, it could be potentially used for forcing conceptual hydrological models that only need daily time-series of these variables.
Furthermore, with common existing disaggregation methods existing in the literature, one can generate sub-daily time-series of each variable and use them for forcing physically based models that may need more climate variables as their forcing data.
The table below, summarizes the variables offered by this dataset:
Variable Name |
Variable (keyword for |
Unit |
IPCC Abbreviation |
Comments |
|---|---|---|---|---|
maximum temperature@2m |
|
K |
tasmax |
near-surface 2m level |
minimum temperature@2m |
|
K |
tasmin |
near-surface 2m level |
precipitation |
|
mm/day |
pr |
surface level |
relative humidity |
|
% |
hurs |
near-surface level |
specific humidity |
|
1 |
huss |
near-surface 2m level |
longwave radiation |
|
W/m^2 |
rlds |
surface level |
shortwave radiation |
|
W/m^2 |
rsds |
surface level |
wind speed@10m |
|
m/s |
(N/A) |
near-surface 10m level |
mean air temperature@2m |
|
K |
tas |
near-surface 2m level |
For the most up-to-date information please visit NASA’s NEX-GDDP-CMIP6 project website.