Identification_Information:
   Dataset_Identifier: G02200

   Citation: 
      Citation_Information: 
         Originator: J. Hutchings, C. Geiger, J. Richter-Menge, A. Roberts, M. Doble, R. Forsberg, K. Giles, C. Haas, S. Hendriks, C. Khambhamettu, S. Laxon, T. Martin, M. Pruis, M. Thomas, P. Wadhams, D. Wilkinson, J. Zwally
         Publication_Date: 20110519
         Title: SEDNA: Sea ice Experiment - Dynamic Nature of the Arctic
         Publication_Information: 
            Publication_Place: Fairbanks, Alaska USA
            Publisher: IARC: International Arctic Research Center, UAF
         Online_Linkage: http://nsidc.org/data/g02200.html
         Online_Linkage: http://dx.doi.org/10.7265/N5KK98PH

   Description: 
      Abstract:
         The Sea Ice Experiment - Dynamic Nature of the Arctic (SEDNA) is an 
         international collaborative effort to improve the understanding of the 
         interaction between sea ice dynamics and Arctic climate. It was also the first 
         International Polar Year 2007-2008  field project.  

         The SEDNA data portal provides access to many and varied data sets from the 
         diverse set of campaign participants.  The data portal holds 37 entries from 
         remote sensing to in situ measurements collected during the ice camp in March 
         and April 2007. This data collection is distributed by the International 
         Arctic Research Center (IARC) at the University of Alaska Fairbanks (UAF). 
         NSIDC maintains the metadata for this data collection, so the data are easier 
         to find through the NSIDC data catalog and those catalogs with which NSIDC 
         shares metadata. This summary and metadata are accurate as of June 2011.  The 
         UAF archive site may have more recent data updates and publications, please 
         visit their site for the most up-to-date information.

         The mass balance of sea ice and the evolution of sea ice thickness 
         distribution is a key component of the Arctic system. It is controlled by 
         thermodynamic ice growth and melt, mechanical redistribution through ridging 
         and rafting, and transport. The SEDNA experiment was designed in a regional 
         Lagrangian frame of reference and tracked the evolution of a region of ice 
         surrounding the Applied Physics Laboratory Ice Station (APLIS) 2007 ice camp 
         in an effort to evaluate the role of mechanical redistribution on ice 
         thickness distribution. The SEDNA data collection is unique in that several 
         ice thickness data sets were inter-calibrated and coordinated with monitoring 
         of the ice pack strain-rate (horizontal deformation) and measurements of 
         internal ice stress. This experiment was designed to improve our understanding 
         of the relationship between sea ice thickness and dynamics and to investigate 
         the stress and strain-rate relationships with a comprehensive suite of 
         spatio-temporal coincident observations.

         Measurements were made with the aim of resolving the time evolving ice 
         thickness distribution in the vicinity of the ice camp, to map ice pack 
         deformation (strain-rate), and track strain-rate and internal ice stress in 
         time. This has required a detailed inter-comparison of ice thickness 
         measurements from a number of sources including submarine upward looking sonar 
         (ULS) (Peter Wadhams), AUV multi-beam ULS (Peter Wadhams and Martin Doble), 
         airborne LIDAR (Rene Forsberg), Helicopter borne electromagnetic induction 
         (EMI) (Christian Haas), and in situ snow and ice measurements with drill and 
         EM-31 soil surveyor (Cathy Geiger and Jackie Richter-Menge). Sea ice 
         deformation was mapped in near-real time from analysis of RADARSat-1 ScanSAR-B 
         by the Map of Moving Topography method (Mani Thomas, Chandra Kambhattmettu, 
         and Cathy Geiger), and high temporal sampling was achieved with an array of 
         GPS drifting buoys (Jenny Hutchings). Matt Pruis used GPS buoys to measure 
         deformation of single leads. Ice stress and mass balance were measured with 
         CRREL stress buoys (Jackie Richter-Menge). Additional measurements include a 
         3-m weather station (Andrew Roberts), CTD profiles every six hours (Jeremy 
         Wilkinson), downward looking Acoustic Doppler Current Profiler (ADCP), and 
         met-buoys (Ignatius Rigor). 

         Data are generally available in three formats: the original format, netCDF, 
         and ASCII. The original version is not always well documented.  The netCDF 
         version includes carefully collected documentation placed in the header fields 
         of the netCDF file. Often, data are also available in a separate ASCII file as 
         columns of data concatenated behind the netCDF header information in plain 
         text form.

         SEDNA is supported by the NSF Grant "Collaborative Research: Detailed 
         Investigation of the Dynamic Component of Sea Ice Mass Balance" (OPP ARC 
         0612527 (UAF), 0611991 (CRREL), and 0612105 (University of Delaware)).

      Purpose: scientific research

   Time_Period_of_Content:
      Time_Period_Information:
         Range_of_Dates/Times:
            Beginning_Date: 20070201
            Ending_Date: 20070630
      Currentness_Reference: publication date

   Status:
      Progress: Complete
      Maintenance_and_Update_Frequency: Unknown

   Spatial_Domain:
      Bounding_Coordinates:
         West_Bounding_Coordinate: -170
         East_Bounding_Coordinate: -130
         North_Bounding_Coordinate: 76
         South_Bounding_Coordinate: 70

   Keywords:
      Theme:
         Theme_Keyword_Thesaurus: NASA Global Change Master Directory (GCMD) Science Keywords
         Theme_Keyword: EARTH SCIENCE > Cryosphere > Sea Ice > Sea Ice Mass Balance
         Theme_Keyword: EARTH SCIENCE > Cryosphere > Sea Ice > Ice Deformation
         Theme_Keyword: EARTH SCIENCE > Cryosphere > Snow/Ice > Ice Depth/Thickness > Distribution
         Theme_Keyword: EARTH SCIENCE > Cryosphere > Snow/Ice > Ice Motion
         Theme_Keyword: EARTH SCIENCE > Oceans > Sea Ice > Sea Ice Dynamics
         Theme_Keyword: EARTH SCIENCE > Oceans > Sea Ice > Ice Deformation
      Theme:
         Theme_Keyword_Thesaurus: None
         Theme_Keyword: 
      Theme:
         Theme_Keyword_Thesaurus: NASA Global Change Master Directory (GCMD) Instrument Keywords
         Theme_Keyword: ADCP > Acoustic Doppler Current Profiler
         Theme_Keyword: CTD > Conductivity, Temperature, Depth
         Theme_Keyword: GPR > Ground Penetrating Radar
         Theme_Keyword: GPS > Global Positioning System
         Theme_Keyword: ICE STRESS SENSORS
         Theme_Keyword: LIDAR > Light Detection and Ranging
         Theme_Keyword: SAR > Synthetic Aperture Radar
         Theme_Keyword: THERMISTORS
         Theme_Keyword: UPWARD LOOKING SONAR
         Theme_Keyword: VISUAL OBSERVATIONS
      Theme:
         Theme_Keyword_Thesaurus: NASA Global Change Master Directory (GCMD) Platform Keywords
         Theme_Keyword: AIRCRAFT
         Theme_Keyword: AUVS > Autonomous Underwater Vehicles
         Theme_Keyword: BUOYS
         Theme_Keyword: HELICOPTER
         Theme_Keyword: METEOROLOGICAL STATIONS
         Theme_Keyword: SATELLITES
         Theme_Keyword: SUBMARINE
      Theme:
         Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
         Theme_Keyword: climatologyMeteorologyAtmosphere
      Theme:
         Theme_Keyword_Thesaurus: None
         Theme_Keyword: climate variability
         Theme_Keyword: Cryosphere
         Theme_Keyword: DRIFTING STATIONS
         Theme_Keyword: electromagnetic induction (EMI)
         Theme_Keyword: Field Camps
         Theme_Keyword: Ice Deformation
         Theme_Keyword: ice dynamics
         Theme_Keyword: Ice Growth
         Theme_Keyword: Ice Melt
         Theme_Keyword: Ice Thickness Distribution
         Theme_Keyword: IN-SITU
         Theme_Keyword: Ocean Drifting Station
         Theme_Keyword: Physical Oceanography
         Theme_Keyword: Sea Ice
         Theme_Keyword: sea ice camps
         Theme_Keyword: sea ice mass balance
         Theme_Keyword: Sea Ice Surface Elevation
      Place:
         Place_Keyword_Thesaurus: NASA Global Change Master Directory (GCMD) Location Keywords
         Place_Keyword: Ocean > Arctic Ocean > Beaufort Sea > Perrenial-seasonal ice boundary

   Access_Constraints: None

   Use_Constraints:

      No use constraints. The data are freely available to anyone who wants to use 
      it. If data are used in a publication, please cite using the formal data 
      citation.


   Point_of_Contact:
      Contact_Information:
         Contact_Person_Primary:
            Contact_Person: Bruce Elder
            Contact_Organization: Cold Regions Research and Engineering Laboratory
         Contact_Address:
            Address_Type: mailing
            Address: 72 Lyme Rd.
            City: Hanover
            State_or_Province: NH
            Postal_Code: 03755-1290
            Country: USA
         Contact_Voice_Telephone: Unknown
         Contact_Electronic_Mail_Address: Bruce.C.Elder@erdc.usace.army.mil

Distribution_Information:
   Distributor:
      Contact_Information:
         Contact_Organization_Primary:
            Contact_Organization: National Snow and Ice Data Center
            Contact_Person: NSIDC User Services
         Contact_Address:
            Address_Type: mailing
            Address: National Snow and Ice Data Center
            Address: CIRES, 449 UCB
            Address: University of Colorado
            City: Boulder
            State_or_Province: CO
            Postal_Code: 80309-0449
            Country: USA
         Contact_Voice_Telephone: 1 303 492-6199 
         Contact_Facsimile_Telephone: 1 303  492-2468 
         Contact_Electronic_Mail_Address: nsidc@nsidc.org

   Resource_Description: G02200

   Distribution_Liability:
      NSIDC cannot assume liability for any damages caused by any errors or 
      omissions in the data, nor as a result of the failure of the data to function 
      on a particular system. NSIDC makes no warranty, expressed or implied, nor 
      does the fact of distribution constitute such a warranty.

Metadata_Reference_Information:
   Metadata_Date: 20130312

   Metadata_Review_Date: 20130312

   Metadata_Contact: 
      Contact_Information:
         Contact_Person_Primary:
            Contact_Person: NSIDC User Services
            Contact_Organization: National Snow and Ice Data Center
         Contact_Address:
            Address_Type: mailing
            Address: National Snow and Ice Data Center
            Address: CIRES, 449 UCB
            Address: University of Colorado
            City: Boulder
            State_or_Province: CO
            Postal_Code: 80309-0449
            Country: USA
         Contact_Voice_Telephone: 1 303 492-6199 
         Contact_Facsimile_Telephone: 1 303  492-2468 
         Contact_Electronic_Mail_Address: nsidc@nsidc.org

   Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata

   Metadata_Standard_Version: FGDC-STD-012-2002