Entry_ID: NSIDC-0064
Entry_Title: Nenana Ice Classic: Tanana River Ice Annual Breakup Dates
Group: Data_Set_Citation
   Dataset_Creator: Nenana Ice Classic
   Dataset_Title: Nenana Ice Classic: Tanana River Ice Annual Breakup Dates
   Dataset_Release_Date: 2011-09-29
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0064.html
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Freeze/Thaw
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Growth/Melt
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: River Ice
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Freeze/Thaw
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Ice Growth/Melt
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: River Ice
End_Group
Keyword: EOSDIS
Keyword: Nenana Ice Classic
Keyword: Nenana River
Keyword: NSIDC
Keyword: River Ice Breakup
Keyword: Tanana River
Sensor_Name: CLOCKS
Source_Name: GROUND STATIONS
Group: Temporal_Coverage
   Start_Date: 1917-04-01
End_Group
Data_Set_Progress: in work
Group: Spatial_Coverage
   Southernmost_Latitude: 62
   Northernmost_Latitude: 62
   Westernmost_Longitude: -149
   Easternmost_Longitude: -149
End_Group
Group: Data_Resolution
   Temporal_Resolution: 1 year
End_Group
Project: EOSDIS > Earth Observing System Data Information System
Project: ESIP > Earth Science Information Partners Program
Data_Set_Language: English
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 1 MB
   Distribution_Format: ASCII Text (.txt)
End_Group
Group: Summary

   The Nenana river in the Interior of Alaska usually freezes over during October 
   and November. The ice continues to grow throughout the winter accumulating an 
   average maximum thickness of about 110 cm, depending upon winter weather 
   conditions.

   The Nenana River Ice Classic competition began in 1917 when railroad engineers 
   bet a total of 800 dollars, winner takes all, guessing the exact time (month, 
   day, hour, minute) ice on the Nenana River would break up. Each year since 
   then, Alaska residents have guessed at the timing of the river breakup. A 
   tripod, connected to an on-shore clock with a string, is planted in two feet 
   of river ice during river freeze-up in October or November. The following 
   spring, the clock automatically stops when the tripod moves as the ice breaks 
   up. The time on the clock is used as the river ice breakup time.

   Many factors influence the river ice breakup, such as air temperature, ice 
   thickness, snow cover, wind, water temperature, and depth of water below the 
   ice. Generally, the Nenana river ice breaks up in late April or early May 
   (historically, April 20 to May 20). The time series of the Nenana river ice 
   breakup dates can be used to indicate climate change in the region.

End_Group
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2011-09-29
Last_DIF_Revision_Date: 2013-03-18
DIF_Revision_History: Fixed Access Data link. No optional reg form was chosen.