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MERRA-2 tavgU_3d_rad_Np: 3d,diurnal,Time-Averaged,Pressure-Level,Assimilation,Radiation Diagnostics 0.625 x 0.5 degree V5.12.4 (M2TUNPRAD) at GES DISC

Metadata Updated: March 19, 2024

M2TUNPRAD (or tavgU_3d_rad_Np) is a 3-dimensional monthly diurnal means data collection in Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2). This collection consists of assimilations of radiation diagnostics on 42 pressure levels, such as cloud fraction for radiation, and air temperature tendency due to longwave (or shortwave). The information on the pressure levels can be found in the section 4.2 of the MERRA-2 File Specification document. This data collection is the monthly mean of data fields for each 3-hour that is time-stamped at the central time starting from 01:30 UTC, e.g.: 01:30, 04:30, … , 22:30 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.

Data Reprocessing: Please check “Records of MERRA-2 Data Reprocessing and Service Changes” linked from the “Documentation” tab on this page. Note that a reprocessed data filename is different from the original file.

MERRA-2 Mailing List: Sign up to receive information on reprocessing of data, changing of tools and services, as well as data announcements from GMAO. Contact the GES DISC Help Desk ( to be added to the list.

Questions: If you have a question, please read "MERRA-2 File Specification Document", “MERRA-2 Data Access – Quick Start Guide”, and FAQs linked from the ”Documentation” tab on this page. If that does not answer your question, you may email the question on data access to the GES DISC Help Desk (, or the question on science to the MERRA-2 science team (

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources



Metadata Created Date November 12, 2020
Metadata Updated Date March 19, 2024

Metadata Source

Harvested from NASA Data.json

Graphic Preview

M2TUNPRAD variable

Additional Metadata

Resource Type Dataset
Metadata Created Date November 12, 2020
Metadata Updated Date March 19, 2024
Identifier C1276812946-GES_DISC
Data First Published 2007-06-14
Language en-US
Data Last Modified 2015-07-07
Category MERRA-2, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation Global Modeling and Assimilation Office (GMAO). 2015-06-30. M2TUNPRAD. Version 5.12.4. MERRA-2 tavgU_3d_rad_Np: 3d,diurnal,Time-Averaged,Pressure-Level,Assimilation,Radiation Diagnostics V5.12.4. Greenbelt, MD, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). Digital Science Data.
Creator Global Modeling and Assimilation Office (GMAO)
Data Presentation Form Digital Science Data
Graphic Preview Description M2TUNPRAD variable
Graphic Preview File
Harvest Object Id a64873de-2d35-4fea-bab7-e20fd7091b2f
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -180.0 -90.0 180.0 90.0
Program Code 026:001
Related Documents,,,,,,,
Release Place Greenbelt, MD, USA
Series Name M2TUNPRAD
Source Datajson Identifier True
Source Hash bc53cbac272ccff28fb4a6b74a1868133a5ea6cbeecd23b79d1f3141237e4c7d
Source Schema Version 1.1
Temporal 1980-01-01T00:00:00Z/2022-01-17T00:00:00Z

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