NLDAS-2: North American Land Data Assimilation System Forcing Fields

NASA/NLDAS/FORA0125_H002
Dataset Availability
1979-01-01T13:00:00Z–2024-11-13T12:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/NLDAS/FORA0125_H002")
Tags
climate evaporation forcing geophysical hourly humidity ldas nasa precipitation pressure radiation temperature wind
nldas

Description

Land Data Assimilation System (LDAS) combines multiple sources of observations (such as precipitation gauge data, satellite data, and radar precipitation measurements) to produce estimates of climatological properties at or near the Earth''s surface.

This dataset is the primary (default) forcing file (File A) for Phase 2 of the North American Land Data Assimilation System (NLDAS-2). The data are in 1/8th-degree grid spacing; the temporal resolution is hourly.

NLDAS is a collaboration project among several groups: NOAA/NCEP''s Environmental Modeling Center (EMC), NASA''s Goddard Space Flight Center (GSFC), Princeton University, the University of Washington, the NOAA/NWS Office of Hydrological Development (OHD), and the NOAA/NCEP Climate Prediction Center (CPC). NLDAS is a core project with support from NOAA''s Climate Prediction Program for the Americas (CPPA).

Documentation:

Bands

Resolution
13915 meters

Bands

Name Units Min Max Description
temperature °C -49.79* 51.2*

Air temperature at 2 meters above the surface
specific_humidity Mass fraction 0* 0.02*

Specific humidity at 2 meters above the surface
pressure Pa 61847.6* 105338*

Surface pressure
wind_u m/s -27.93* 27.54*

U wind component at 10 meters above the surface
wind_v m/s -27.45* 35.13*

V wind component at 10 meters above the surface
longwave_radiation W/m^2 72.18* 545.11*

Surface downward longwave radiation
convective_fraction 0* 1*

Fraction of total precipitation that is convective: from NARR
potential_energy J/kg 0* 76666.2*

Convective available potential energy (J/kg): from NARR
potential_evaporation kg/m^2 0* 2.76*

Potential evaporation: from NARR
total_precipitation kg/m^2 0* 124.19*

Hourly total precipitation
shortwave_radiation W/m^2 0* 1368.54*

Surface downward shortwave radiation - bias corrected
* estimated min or max value

Image Properties

Image Properties

Name Type Description
end_hour DOUBLE

End hour
start_hour DOUBLE

Start hour

Terms of Use

Terms of Use

Distribution of data from the Goddard Earth Sciences Data and Information Services Center (GES DISC) is funded by NASA's Science Mission Directorate (SMD). Consistent with NASA Earth Science Data and Information Policy, data from the GES DISC archive are available free to the user community. For more information visit the GES DISC Data Policy page.

Citations

Citations:

  • The data set source should be properly cited when the data are used. A formal reference of the form: \, 2012, last updated 2013: \. NASA/GSFC, Greenbelt, MD, USA, NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). Accessed \ at \ is suggested following Parsons et al. (2010), doi:10.1029/2010EO340001.

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('NASA/NLDAS/FORA0125_H002')
                  .filter(ee.Filter.date('2018-07-01', '2018-07-30'));
var temperature = dataset.select('temperature');
var temperatureVis = {
  min: -5.0,
  max: 40.0,
  palette: ['3d2bd8', '4e86da', '62c7d8', '91ed90', 'e4f178', 'ed6a4c'],
};
Map.setCenter(-110.21, 35.1, 4);
Map.addLayer(temperature, temperatureVis, 'Temperature');
Open in Code Editor
Land Data Assimilation System (LDAS) combines multiple sources of observations (such as precipitation gauge data, satellite data, and radar precipitation measurements) to produce estimates of climatological properties at or near the Earth''s surface. This dataset is the primary (default) forcing file (File A) for Phase 2 of the North American …
NASA/NLDAS/FORA0125_H002, climate,evaporation,forcing,geophysical,hourly,humidity,ldas,nasa,precipitation,pressure,radiation,temperature,wind
1979-01-01T13:00:00Z/2024-11-13T12:00:00Z
24.85 -125.15 53.28 -66.85
Google Earth Engine