Data Announcements

NSIDC DAAC Updates Northern Hemisphere EASE-Grid 2.0 Weekly Snow Cover and Sea Ice Extent Data Set

19 September 2016

The Northern Hemisphere EASE-Grid 2.0 Weekly Snow Cover and Sea Ice Extent data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) was updated to Version 4.1 because the input data to this data set, Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, NSIDC-0051, was updated. The temporal coverage of this data set was also updated through 27 December 2015.

Data Set DOI: http://dx.doi.org/10.5067/P7O0HGJLYUQU

NSIDC DAAC Updates Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Data Set

19 September 2016

The Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS data set, available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through 31 December 2015.

Data Set DOI: http://dx.doi.org/10.5067/J6JQLS9EJ5HU.

NSIDC DAAC Updates Near-Real-Time Polar Stereographic SSMIS Brightness Temperature Data Set

14 June 2016

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has updated the Near-Real-Time DMSP SSMIS Daily Polar Gridded Brightness Temperatures data set so that it now solely provides data from the DMSP-F18 SSMIS sensor beginning with 01 April 2016 due to the compromised data integrity of the DMSP-F17 SSMIS vertically polarized 37 GHz channel (37V). Data before 01 April 2016 are still from the F17 SSMIS.

Data Set DOI: http://dx.doi.org/10.5067/AKQDND71ZDLF

NSIDC DAAC Updates Near-Real-Time SSMIS Polar Stereographic Sea Ice Concentration Data Set

14 June 2016

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has completed investigating calibration of data from the DMSP-F18 SSMIS sensor for the Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentration data set. The tie points used with F17 SSMIS data provided the best match in sea ice extent, so no adjustment to the tie points were made for F18. The average difference between F17- and F18-derived sea ice extents were approximately 20,000 sq km. This data set now uses F17 data from 01 January 2015 through 31 March 2016 and then F18 data from 01 April 2016 onward.

Data Set DOI: http://dx.doi.org/10.5067/U8C09DWVX9LM

NSIDC DAAC Updates Passive Microwave Sea Ice Concentration Data Set

24 May 2016

The Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data data set available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) has been updated through 31 December 2015.

Data Set DOI: http://dx.doi.org/10.5067/8GQ8LZQVL0VL

Compromised Data Integrity with the F17 Near-Real-Time DMSP SSMIS Daily Polar Gridded Brightness Temperatures Data Set

5 May 2016

Due to the compromised data integrity with the Defense Meteorological Satellite Program (DMSP) F-17 vertically polarized 37 GHz channel (37V) of the Special Sensor Microwave Imager and Sounder (SSMIS), NSIDC will be distributing data from both the F17 and F18 satellites, starting with 1 April 2016 data. Using data from the 37V channel from the F17 satellite is not recommended. Instead, you should use data from the F18 satellite’s 37V channel.

On 04/05/2016 a change in the solar panel position to shade the nitrogen tank on board the DMSP F-17 satellite was made. In doing so, the integrity of the vertically polarized 37V channel of the SSMIS was compromised. On 04/13/16 an additional change in the solar panel position was made. This change had improved the problems we were seeing in the 37V GHz channel; however, on April 20, the 37V GHz channel started to produce bad data again. Thus, a decision to use F18 data was made at that time.

NSIDC Halts Production of the Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations F17 Data

5 May 2016

Due to the compromised data integrity with the DMSP F17 vertically polarized 37 GHz channel (37V) of the Special Sensor Microwave Imager and Sounder (SSMIS), which is a primary channel used for sea ice development, NSIDC is halting production of the Near-Real-Time DMSP SSMIS Daily Polar Gridded Sea Ice Concentrations F17 data and switching over to the F18 satellite, starting with 1 April 2016 data. However, NSIDC is still working on the calibration of the F18 data so temporarily the F18 data will be uncalibrated and using F17 tie points.

On 04/05/2016 a change in the solar panel position to shade the nitrogen tank on board the DMSP F-17 satellite was made. In doing so, the integrity of the vertically polarized 37V channel of the SSMIS was compromised. On 04/13/16 an additional change in the solar panel position was made. This change had improved the problems we were seeing in the 37V GHz channel; however, on April 20, the 37V GHz channel started to produce bad data again. Thus, a decision to use F18 data was made at that time.

NSIDC DAAC Updates EASE-Grid Sea Ice Age Data Set

8 April 2016

Version 3 of the EASE-Grid Sea Ice Age data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The input ice motion data used for this data set is now derived from NSIDC-0116 Version 3 data, and the data were updated through 31 May 2015.

Data Set DOI: http://dx.doi.org/10.5067/PFSVFZA9Y85G.

NSIDC DAAC Updates Sea Ice Motion Vectors Data Set

1 March 2016

Version 3 of the Polar Pathfinder Daily 25 km EASE-Grid Sea Ice Motion Vectors data set is now available at the NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC). The data was updated through 31 May 2015. The following changes were made to the data set:

  • Eliminated unrealistic AVHRR and IABP buoy velocities
  • Extended buoy ice motion estimates to the present
  • Improved browse images
  • Reprocessed SSMI fields using GDAL map transformations on the DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures Data Set, NSIDC-0001.
  • Used Ice concentration estimates greater than 15 percent from the Sea Ice Concentrations from Nim bus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data Set, NSIDC-0051, to indicate where ice extent is present.

Data Set DOI: http://dx.doi.org/10.5067/O57VAIT2AYYY.

NSIDC DAAC Updates Polar Stereographic Sea Ice Concentrations Data Set to Version 1.1

22 December 2015

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is pleased to announce that the Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, data set has been updated through 31 May 2015. For information regarding all the changes made to this new Version 1.1 of the data, see the Version History Table.

Data Set DOI: http://dx.doi.org/10.5067/8GQ8LZQVL0VL

NSIDC DAAC Updates Polar Stereographic Brightness Temperature Data Set

25 August 2015

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is pleased to announce that the DMSP SSM/I-SSMIS Daily Polar Gridded Brightness Temperatures, Version 4 data set has been updated through 30 June 2015.  These daily gridded brightness temperature data are from orbital swath data generated by the Special Sensor Microwave/Imager (SSM/I) aboard the Defense Meteorological Satellite Program (DMSP) F8, F11, and F13 platforms and the Special Sensor Microwave Imager/Sounder (SSMIS) aboard DMSP-F17.

Data Set DOI: http://dx.doi.org/10.5067/AN9AI8EO7PX0

NSIDC DAAC Releases Polar Stereographic Valid Ice Mask Data Set

15 May 2015

The NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC) is pleased to announce the release of the Polar Stereographic Valid Ice Masks Derived from National Ice Center Monthly Sea Ice Climatologies data set. These valid ice masks provide a way to remove spurious ice caused by residual weather effects and land spillover in passive microwave data, and are derived from the National Ice Center Arctic Sea Ice Charts and Climatologies data.

Data Set DOI: http://dx.doi.org/10.5067/M4PUJAQRI2DS