MERRA DAS 2D Constants V5.2.0 (MAC0NXASM) at GES DISC

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Abstract: The MAC0NXASM or const_2d_asm_Nx data product is the MERRA Data Assimilation System 2-Dimensional Constants at native resolution. MERRA, or the Modern Era Retrospective-analysis for Research and Application, is a NASA reanalysis for the satellite era (30 years 1979-current) using the Goddard Earth Observing System Data Assimilation System Version 5 (GEOS-5 DAS).

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Related URL
Description: Access the data via FTP
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Geographic Coverage
Spatial coordinates   
  N: 90.0   S: -90.0   E: 180.0   W: -180.0

Data Set Citation
Dataset Originator/Creator: Global Modeling and Assimilation Office (GMAO)
Dataset Title: MERRA DAS 2D Constants
Dataset Series Name: MAC0NXASM
Dataset Release Date: August 1, 2007
Dataset Release Place: Greenbelt, MD, USA
Dataset Publisher: Goddard Earth Science Data and Information Services Center (GES DISC)
Version: 5.2.0
Data Presentation Form: Digital Science Data
Other Citation Details:
Online Resource:
Temporal Coverage
Start Date: 1979-01-01
Data Resolution
Latitude Resolution: 1/2 degrees
Longitude Resolution: 2/3 degrees
Temporal Resolution: daily
Data Set Progress
Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA Supplemental Info
Data Center URL:

Data Center Personnel
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Distribution Media: Online (FTP)
Distribution Size: 5.5 MB per file
Distribution Format: HDF-EOS (Grid)
Fees: Free
Phone: 301-614-6142
Email: data at
Contact Address:
NASA Goddard Space Flight Center
Code 610.1
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
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* Bloom, S., L. Takacs, A. DaSilva, and D. Ledvina, 1996: Data assimilation using incremental analysis updates. Mon. Wea. Rev., 124, 1256-1271.

* Bloom, S., A. da Silva, D. Dee, M. Bosilovich, J.-D. Chern, S. Pawson, S. Schubert, M. Sienkiewicz, I. Stajner, W.-W. Tan, M.-L. Wu, 2005: Documentation and Validation of the Goddard Earth ... View entire text
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2007-06-14
Last DIF Revision Date: 2014-08-20
Future DIF Review Date: 2015-02-01
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