Data Set ID:

Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures, Version 4

This data set includes yearly snow melt onset dates over Arctic sea ice derived from Scanning Multichannel Microwave Radiometer (SMMR), Special Sensor Microwave/Imager (SSM/I), and the Special Sensor Microwave Imager/Sounder (SSMIS) brightness temperature measurements. The data are gridded to the 25 km Northern Hemisphere Polar Stereographic projection and available from 1979 through 2017. One browse image is available for each year.

This data set also contains value-added statistics for each grid cell, including: mean melt onset date, latest (maximum) melt onset date, earliest (minimum) melt onset date, range of melt onset dates (the difference between maximum and minimum onset dates), and the standard deviation of melt onset dates. One browse image is also provided for each statistical field.

This is the most recent version of these data.

Version Summary:

Changes to this version include:
Reprocessing the entire data set using an newer version of the source data used to produce sea ice extent masks within the snow melt onset algorithm. No other changes were made to the algorithm.
Extending the data record through 2017.
Adding quality flags to indicate where snow melt dates were not derived. The flags discriminate between sea ice where the snow melt onset date was not found and pixels included in the land mask, the pole hole, and areas of open water.
Updating data fields that summarize basic statistics over the length of the data record.
Distributing the data as a netCDF file.

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Documentation: Key metadata and comprehensive user guide available

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Data Format(s):
  • NetCDF
  • PNG
Spatial Coverage:
N: 90, 
S: 30, 
E: 180, 
W: -180
Platform(s):DMSP, DMSP 5D-2/F11, DMSP 5D-2/F13, DMSP 5D-2/F8, DMSP 5D-3/F17, Nimbus-7
Spatial Resolution:
  • 25 km x 25 km
Sensor(s):SMMR, SSM/I, SSMIS
Temporal Coverage:
  • 1 January 1979 to 31 December 2017
Temporal Resolution1 yearMetadata XML:View Metadata Record
Data Contributor(s):Mark Anderson, Angela Bliss, Sheldon Drobot

Geographic Coverage

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As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Anderson, M., A. C. Bliss, and S. Drobot. 2019. Snow Melt Onset Over Arctic Sea Ice from SMMR and SSM/I-SSMIS Brightness Temperatures, Version 4. [Indicate subset used]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: [Date Accessed].

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No technical references available for this data set.

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