Data Announcements

3 May 2022

NOAA@NSIDC would like to make users aware that the ice-off dates for certain years between 2006-2019 for 20 Maine Lakes in this database have been corrected. The source of these dates for 2007-2008 onwards for 19 of these lakes are the Maine Department of Agriculture, Conservation and Forestry (DACF). For China Lake, all the data are from the Townline/China Lake Association. Discrepancies in the ice-off dates of one day early were discovered, which were either due to a miscalculation of the Julian day or typographical errors. These have now been corrected so that the ice-off dates in the database match those reported by Maine DACF or the Townline/China Lake Association. Also, new ice-off dates for the 2014-2015 season for Pennessewassee (Norway) Lake, Eagle Lake, and China Lake were added.

Access to the data and... more

28 April 2022

NOAA@NSIDC would like to make users aware of a change to the processing frequency for the U.S. National Ice Center Arctic and Antarctic Sea Ice Concentration and Climatologies in Gridded Format data set. The USNIC has changed to creating their Arctic and Antarctic Sea Ice Charts from weekly to every other week. The Arctic and Antarctic charts will be processed on alternating weeks. For example, the Arctic charts were processed for the week of 18 April 2022, and the Antarctic will be processed the following week, and so on alternating each week. This change was implemented due to the time intensity of creating the charts and the need for the most prudent use of the USNIC analyst’s time. For more information on this data set and to access these data, please visit the U.S. National Ice Center Arctic and Antarctic Sea Ice Concentration and Climatologies in Gridded Format landing page.

Data Set DOI:... more

18 April 2022

On 18 April 2022, the IMS Daily Northern Hemisphere Snow and Ice Analysis files were renamed. Two updates were made to the file names:

  1. Addition of the timestamp to the file names for which the data are valid. This was applied to all the files archived at NSIDC from 2014 to present (V1.1, V1.2 and V1.3).
  2. The V1.1 and V1.2 filenames are now consistent with the way the V1.3 files are named.

For update #1, the file names now include a UTC time code of 00UTC:

imsYYYYDDD_00UTC_Xkm_vZ.z.asc.gz

where YYYYDDD is the 4-digit year and 3-digit day of year, 00UTC indicates that the data are valid at 0:00 UTC for the date in the file name, Xkm is the resolution (1km, 4km, or 24km), and vZ.z is the version number (v1.1, v1.2, or v1.3).

For update #2, the V1.1 and V1.2 files have had their date incremented by one day so that the file name reflects the data for which the data are valid,... more

4 April 2022

NOAA@NSIDC is pleased to announce that the Glacier Covered Area for the State of Alaska, 1985-2020, Version 1 data set is now available at the National Snow and Ice Data Center (NSIDC). This data set captures changes in glacier covered area across the state of Alaska for the period of 1985-2020. The data set includes 18 biannual shapefiles each for overall glacier covered area, supraglacial debris area, and debris-free glacier covered area.

Within the shapefiles, the polygon attributes include information from the Randolph Glacier Inventory (RGI Consortium, 2017) such as RGI glacier ID, latitude, longitude, minimum and maximum elevation, slope, and aspect. The overall glacier covered area shapefiles include the entire state of Alaska. The supraglacial debris area and debris-free glacier covered area shapefiles do not include the Brooks Range. These data were derived from a time series of Landsat data, supplemented with elevation... more

21 March 2022

On 18 April 2022, the IMS Daily Northern Hemisphere Snow and Ice Analysis (G02156) data set will have new file names. There are two updates being made to the file names:

  1. Addition of the timestamp to the file names for which the data are valid. This will affect all versions of IMS data (V1.1, V1.2, and V1.3).
  2. Update of the V1.1 and V1.2 files to be consistent with the way the V1.3 files are named, which will affect only V1.1 and V1.2 IMS data.

The current file names follow this convention:

imsYYYYDDD_Xkm_vZ.z.asc.gz

where YYYYDDD is the 4-digit year and 3-digit day of year, Xkm is the resolution (1km, 4km, or 24km), and vZ.z is the version number (v1.1, v1.2, or v1.3).

For update #1 that affects all versions, the new file names will have a UTC time code added to them as follows:

imsYYYYDDD_00UTC_Xkm_vZ.z.asc.gz

The 00UTC indicates that the data are valid at 0:00 UTC for... more

10 March 2022

NOAA@NSIDC is pleased to announce that the Climate Data Record of Passive Microwave Sea Ice Concentration, Version 4 data set, accessible through the National Snow and Ice Data Center (NSIDC), has been updated to include the time period of 01 June 2021 through 31 December 2021. This data set provides a consistent daily and monthly time series of sea ice concentrations from 25 October 1978 through 31 December 2021 for both the north and south polar regions on a 25 km x 25 km grid.

Note that the 2021 data for June to December for the near-real-time (NRT) version of this data set, Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration, Version 2, have been removed since the final processed version supersedes the NRT version. If you have 2021 NRT data, we suggest that you download and replace it with the 2021 final processed version of this data set.

To access these data and view the documentation, visit the... more

8 March 2022

NOAA@NSIDC is pleased to announce that the International Ice Patrol (IIP) has updated their Iceberg Sightings Database through the 2021 iceberg season. The IIP has been collecting information on iceberg activity in the North Atlantic since 1913, and this database contains data from these sightings starting in 1960. The IIP data files include latitude and longitude of sighted icebergs, coded iceberg size and shape class, and date and time of the sighting. For more information on this data set and to access the data, please visit the International Ice Patrol Iceberg Sightings Database landing page.

Data Set DOI: http://dx.doi.org/10.7265/N56Q1V5R

13 January 2022

The Daily Great Lakes Ice Concentration, 1973 Onward, Version 1 data set has been updated. There were some missing daily ASCII files for the years 2007 to 2009 and 2011 to 2016. These missing files for additional days have been added to the archive and are now available.

This data set consists of daily gridded lake ice concentration for the Laurentian Great Lakes from the NOAA Great Lakes Environmental Research Laboratory (GLERL).

Data set DOI: https://doi.org/10.7265/krkb-f591

9 December 2021

NOAA@NSIDC would like to make you aware of a change to the data used to produce the U.S. National Ice Center Arctic and Antarctic Sea Ice Concentration and Climatologies in Gridded Format, Version 1 data set. As of October 2021, USNIC revised the way they indicate first-year ice (FYI) on the Arctic weekly ice charts that are the basis for this data set. USNIC has chosen to only use WMO SIGRID code “86, First-Year Ice” for all FYI designations. Thus, all charts on the USNIC website, as well as the SIGRID-3 format version of those charts that serve as input for this product, will have FYI indicated by 86 only. Gradations within the first-year category will no longer be routinely charted. These sub-categories are SIGRID codes 87, 88, 89, 91, and 93 which correspond to thin FYI, thin FYI – stage1, thin FYI – stage2, medium FYI, and thick FYI, respectively.

USNIC has made this change to reduce the time analysts... more

17 November 2021

NOAA@NSIDC is pleased to announce that the Climate Data Record of Passive Microwave Sea Ice Concentration, Version 4 data set has been updated to include the time period of 01 January 2021 through 31 May 2021. This data set provides a consistent daily and monthly time series of sea ice concentrations from 25 October 1978 through 31 May 2021 for both the north and south polar regions on a 25 km x 25 km grid.

Note that the 2021 data for January to May for the near-real-time (NRT) version of this data set, Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration, Version 2, have been removed since the final processed version supersedes the NRT version. If you have 2021 NRT data, we suggest that you download and replace it with the 2021 final processed version of this data set.

To access these data and view the... more