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NLDAS-3

The third phase of North American Land Data Assimilation System (NLDAS-3) is currently in development.

Note that the NLDAS-3 data is not yet publicly available. Please check this page for updates on data availability.

A NASA EarthData VEDA story on the development of NLDAS-3 is now published. It includes some sample not-final precipitation data from NLDAS-3 as well as Jupyter Notebooks to examine the data and compare it to NLDAS-2 precipitation.

Please feel free to ask questions and contribute to discussions on the NLDAS-3 GitHub.

POC (Points of Contact) for NLDAS-3:

To receive updates on NLDAS-3 datasets and workshops, please sign up using this Google Form.


Third NLDAS-3 workshop (10 April 2025):

Recording of NLDAS-3 Drought Monitoring Workshop (co-hosted with NOAA NIDIS and the National Drought Mitigation Center).

Slides presented during the 3rd NLDAS-3 workshop.

Feedback and breakout sessions slides from the 3rd NLDAS-3 workshop.

Second NLDAS-3 workshop (29 July 2024):

Recording of 2nd NLDAS-3 Stakeholder Workshop, with updates on NLDAS-3 development.

Following this workshop, we published a question/answers and discussion document on NLDAS-3.

First NLDAS-3 workshop (08 November 2023)

Recording of 1st NLDAS-3 Stakeholder Workshop.


Table 1: List of NLDAS-3 surface forcing variables.  Data is available hourly.  Daily-averages will also be made available.

Variable

Short Name

Units

Near-surface air temperature

Tair

K

Near-surface specific humidity

Qair

kg kg-1

Surface pressure

PSurf

Pa

Northward wind

Wind_N

m s-1

Eastward wind

Wind_E

m s-1

Downward longwave radiation at the surface

LWdown

W m-2

Downward shortwave radiation at the surface

SWdown

W m-2

Total precipitation rate

Rainf

kg m-2 s-1


Table 2: List of expected Noah-MP LSM output variables from NLDAS-3.  Data is daily-averaged except where noted below.

Variable

Short Name

Units

Surface net downward shortwave flux

SWnet_tavg

W m-2

Surface net downward longwave flux

LWnet_tavg

W m-2

Surface upward latent heat flux

Qle_tavg

W m-2

Surface upward sensible heat flux

Qh_tavg

W m-2

Downward heat flux in soil

Qg_tavg

W m-2

Snowfall rate (frozen)

Snowf_tavg

kg m-2 s-1

Rainfall rate (liquid)

Rainf_tavg

kg m-2 s-1

Total evapotranspiration

Evap_tavg

kg m-2 s-1

Surface runoff amount

Qs_tavg

kg m-2 s-1

Subsurface runoff amount

Qsb_tavg

kg m-2 s-1

Surface temperature

AvgSurfT_tavg

K

Daily minimum surface temperature

AvgSurfT_min

K

Daily maximum surface temperature

AvgSurfT_max

K

Liquid water content of surface snow

SWE_tavg

kg m-2

Snow depth

SnowDepth_tavg

m

Soil moisture - 4 layers

[0-10cm; 10-40cm; 40-100cm; 100-200cm]

SoilMoist_tavg

m3 m-3

Soil temperature - 4 layers

[0-10cm; 10-40cm; 40-100cm; 100-200cm]

SoilTemp_tavg

K

Potential evapotranspiration

PotEvap_tavg

kg m-2 s-1

Vapor pressure deficit

VPD_tavg

Pa

Vegetation transpiration

TVeg_tavg

kg m-2 s-1

Bare soil evaporation

ESoil_tavg

kg m-2 s-1

Total canopy water storage

CanopInt_tavg

kg m-2

Water table depth

WaterTableD_tavg

m

Terrestrial water storage

TWS_tavg

mm

Groundwater storage

GWS_tavg

mm

Surface snow area fraction

Snowcover_tavg

[-]

Gross primary production

GPP_tavg

g m-2 s-1

Net primary productivity

NPP_tavg

g m-2 s-1

Net ecosystem exchange

NEE_tavg

g m-2 s-1

Leaf area index

LAI_tavg

[-]


Table 3: List of expected HyMAP routing output variables from NLDAS-3.  Data is daily-averaged.

Variable

Short Name

Units

Streamflow

Streamflow_tavg

m3 s-1

River depth

RiverDepth_tavg

m

Flooded fraction

FloodedFrac_tavg

[-]

Surface water elevation

SurfElev_tavg

m

Surface water storage

SWS_tavg

mm