MERRA-2 M2T1NXRAD: Radiation Diagnostics V5.12.4

NASA/GSFC/MERRA/rad/2
Dataset Availability
1980-01-01T00:00:00Z–2024-10-01T23:00:00Z
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("NASA/GSFC/MERRA/rad/2")
Tags
albedo emissivity merra shortwave temperature

Description

M2T1NXRAD (or tavg1_2d_rad_Nx) is an hourly time-averaged data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2). This collection consists of radiation diagnostics, such as surface albedo, cloud area fraction, in cloud optical thickness, surface incoming shortwave flux (i.e. solar radiation), surface net downward shortwave flux, and upwelling longwave flux at TOA (top of atmosphere) (i.e. outgoing longwave radiation (OLR) at TOA). The data field is time-stamped with the central time of an hour starting from 00:30 UTC, e.g.: 00:30, 01:30, ... , 23:30 UTC.

MERRA-2 is the latest version of global atmospheric reanalysis for the satellite era produced by NASA Global Modeling and Assimilation Office (GMAO) using the Goddard Earth Observing System Model (GEOS) version 5.12.4. The dataset covers the period of 1980-present with the latency of ~3 weeks after the end of a month.

Bands

Resolution
69375 meters

Y Resolution
55000 meters

Bands

Name Units Min Max Description
ALBEDO 0.01* 0.898471*

Surface albedo
ALBNIRDF 0.017455* 0.820016*

Surface albedo for near infrared diffuse
ALBNIRDR 0.018709* 0.82001*

Surface albedo for near infrared beam
ALBVISDF 0.016788* 0.959771*

Surface albedo for visible diffuse
ALBVISDR 0.01853* 0.959762*

Surface albedo for visible beam
CLDHGH 0* 0.999236*

Cloud area fraction for high clouds
CLDLOW 0* 0.999997*

Cloud area fraction for low clouds
CLDMID 0* 0.998779*

Cloud area fraction for middle clouds
CLDTOT 0* 1*

Total cloud area fraction
EMIS 0.943074* 0.999993*

Surface emissivity
LWGABCLRCLN W/m^2 41.1408* 458.523*

Surface absorbed longwave radiation assuming clear sky and no aerosol
LWGABCLR W/m^2 41.1414* 465.929*

Surface absorbed longwave radiation assuming clear sky
LWGAB W/m^2 41.1446* 482.398*

Surface absorbed longwave radiation
LWGEM W/m^2 67.5297* 630.29*

Longwave flux emitted from surface
LWGNTCLRCLN W/m^2 -248.748* 61.0736*

Surface net downward longwave flux assuming clear sky and no aerosol
LWGNTCLR W/m^2 -248.653* 62.2794*

Surface net downward longwave flux assuming clear sky
LWGNT W/m^2 -268.862* 77.255*

Surface net downward longwave flux
LWTUPCLRCLN W/m^2 80.6768* 372.229*

Upwelling longwave flux at TOA assuming clear sky and no aerosol
LWTUPCLR W/m^2 80.6768* 372.229*

Upwelling longwave flux at TOA assuming clear sky
LWTUP W/m^2 80.6506* 370.868*

Upwelling longwave flux at TOA
SWGDNCLR W/m^2 -0.008217* 1155.5*

Surface incoming shortwave flux assuming clear sky
SWGDN W/m^2 0* 1127.49*

Surface incoming shortwave flux
SWGNTCLN W/m^2 0* 1088.42*

Surface net downward shortwave flux assuming no aerosol
SWGNTCLRCLN W/m^2 -3.2e-05* 1088.42*

Surface net downward shortwave flux assuming clear sky and no aerosol
SWGNTCLR W/m^2 -0.001333* 1083.95*

Surface net downward shortwave flux assuming clear sky
SWGNT W/m^2 0* 1083.95*

Surface net downward shortwave flux
SWTDN W/m^2 0* 1404.28*

TOA incoming shortwave flux
SWTNTCLN W/m^2 0* 1315.89*

TOA net downward shortwave flux assuming no aerosol
SWTNTCLRCLN W/m^2 0* 1317.5*

TOA net downward shortwave flux assuming clear sky and no aerosol
SWTNTCLR W/m^2 0* 1316.5*

TOA net downward shortwave flux assuming clear sky
SWTNT W/m^2 0* 1313.33*

TOA net downward shortwave flux
TAUHGH 0* 142.188*

In cloud optical thickness of high clouds(export)
TAULOW 0* 318.218*

In cloud optical thickness of low clouds
TAUMID 0* 252.995*

In cloud optical thickness of middle clouds
TAUTOT 0* 348.125*

In cloud optical thickness of all clouds
TS K 185.73* 328.864*

Surface skin temperature
* estimated min or max value

Terms of Use

Terms of Use

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Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('NASA/GSFC/MERRA/rad/2')
                  .filter(ee.Filter.date('2022-02-01', '2022-02-02')).first();
var surface_albedo = dataset.select('ALBEDO');
var saVis = {
  min: -0.428147,
  max: 0.833350,
  palette: ['001137', '01abab', 'e7eb05', '620500']
};
Map.setCenter(-95, 39, 2);
Map.addLayer(surface_albedo, saVis, 'Surface albedo');
Open in Code Editor
M2T1NXRAD (or tavg1_2d_rad_Nx) is an hourly time-averaged data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2). This collection consists of radiation diagnostics, such as surface albedo, cloud area fraction, in cloud optical thickness, surface incoming shortwave flux (i.e. solar radiation), surface net downward shortwave flux, and …
NASA/GSFC/MERRA/rad/2, albedo,emissivity,merra,shortwave,temperature
1980-01-01T00:00:00Z/2024-10-01T23:00:00Z
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