National Land Data Assimilation Product V2

The NLDAS grid is a 1/8th degree grid that covers the entire contiguous US. This dataset contains the NLDAS2 forcing data at 1/8th degree resolution and a 1 hour time step. This dataset was used to force the conus1_baseline_mod simulation. This dataset is adjusted and bias corrected per the description in O'Neill et al GMD 2021.

Dataset Name: NLDAS2

Data Source: nasa

Data Collection or Processing Notes:

Heavily bias corrected per O'Neill et al GMD 2021. The bias correction is applied to the NLDAS2 data before it is bilinearly interpolated to the ParFlow CONUS1 grid.

Citations:

Please refer to the following citations for more information on this dataset and cite them if you use the data

• https://doi.org/10.5194/gmd-14-7223-2021;

• https://doi.org/10.1002/2016GL069964

• https://ldas.gsfc.nasa.gov/nldas/v2/forcing

Extent and Resolution:

• Available Date Range: 10/1/02 to 9/30/06

• Grid: conus1

  • Spacial Resolution: 1000 meters

  • XY Grid Spacial Extent: 3342 x 1888

  • LatLon Spacial Exent: -121.47939483437318, 31.651836025255015, -76.09875469594509, 50.49802132270979

  • Origin (meters): -1885055.4995, -604957.0654

  • Projection: +proj=lcc +lat_1=33 +lat_2=45 +lon_0=-96.0 +lat_0=39 +a=6378137.0 +b=6356752.31

Variables

This describes the available variables of the dataset. Use the dataset, variables and temporal_resolution in python access functions as described in the Working with Gridded Data, and Working with Point Observations.

Atmospheric Variables

variable	description	temporal_resolution	units	aggregation	grid	3D
precipitation	Precipitation	hourly, daily, monthly_clim, annual_clim, monthly	mm	sum	conus1	no
downward_longwave	Downward longwave radiation	hourly, daily	w/m2	mean	conus1	no
downward_shortwave	Downward shortwave radiation	hourly, daily	w/m2	mean	conus1	no
specific_humidity	Specific humidity	hourly, daily	kg/kg	mean	conus1	no
air_temp	Air temperature	hourly, daily, monthly_clim, annual_clim, monthly	K	min, max, mean	conus1	no
east_windspeed	Zonal windspeed	hourly, daily	m/s	mean	conus1	no
north_windspeed	Meridional windspeed	hourly, daily	m/s	mean	conus1	no
atmospheric_pressure	Atmospheric pressure	hourly, daily	pa	mean	conus1	no