About the DAAC

The NSIDC Distributed Active Archive Center (DAAC) processes, archives, documents, and distributes data from NASA's Earth Observing System (EOS) satellites, airborne campaigns, and field measurement programs. The NSIDC DAAC focuses on the cryosphere and related topics, including snow, sea ice, glaciers, ice sheets, frozen ground, soil moisture, and climate interactions.

The NSIDC DAAC is part of NASA's Earth Observing System Data and Information System (EOSDIS). The DAACs, managed by NASA’s Earth Science Data and Information System Project (ESDIS), offer thousands of Earth system science data products and associated services to a wide community of users. Each DAAC serves one or more specific Earth science disciplines and provides its user community with data products, data information, user services, and tools unique to its particular science.


The NSIDC DAAC is a CoreTrustSeal certified Regular Member of the World Data System, an Interdisciplinary Body of the International Science Council (ISC; formerly ICSU). The NSIDC is one of 12 DAACs that form the network of organizations which the ESDIS Project represents as a Network Member of the WDS.

User Working Group

The NSIDC DAAC has a User Working Group (UWG) of scientists from the fields of research that the DAAC serves. The working group also includes the DAAC Scientist, the NASA Cryosphere Scientist, and the EOSDIS Project Scientist.

A formal Charter has not been written for the UWG. The UWG operates under the following terms of reference.

  • Reviewing the progress and performance of the DAAC relative to the NSIDC DAAC’s missions;
  • Representing the user community in the development and operation of the NSIDC DAAC products and services;
  • Recommending specific data products and services to NASA and the NSIDC DAAC;
  • Providing strategic guidance and advice to NASA and NSIDC on the NSIDC DAAC objectives, priorities, target user communities, implementation approaches, and other issues.

For further details, refer to the UWG Terms of Reference.

    Feedback may be sent to the UWG Chair, Dr. Lawrence Mudryk (lawrence.mudryk@canada.ca), or DAAC UWG Coordinator Amanda Leon (amanda.leon@colorado.edu) at the NSIDC DAAC.

    Current Membership

    Andy Aschwanden

    University of Alaska, Geophysical Institute

    Andrew Barrett

    National Snow and Ice Data Center

    Ludovic Brucker

    NASA Goddard Space Flight Center/USRA

    Gina Henderson

    United States Naval Academy

    Jesse Johnson

    University of Montana, Missoula

    John S. Kimball

    Flathead Lake Biological Station, Division of Biological Sciences, University of Montana

    Fadji Zaouna Mania

    NASA Goddard Space Flight Center/USRA

    Lawrence Mudryk, UWG Chair

    Environment and Climate Change Canada

    Kristin Poinar

    University of Buffalo, Department of Geography

    Mark Raleigh

    Oregon State University, College of Earth, Ocean, and Atmospheric Sciences

    Nicole-Jeanne Schlegel

    NASA Jet Propulsion Laboratory

    Eric Sproles

    Montana State University

    Melinda Webster

    University of Alaska Fairbanks

    NASA Representatives

    Thorsten Markus

    NASA Cryospheric Science Program Manager

    Jeanne Behnke

    ESDIS Project, GSFC