Near-Real-Time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration, Version 3
Data set id:
G10016
DOI: 10.7265/j0z0-4h87
There is a more recent version of these data.
Version Summary
Version Summary
The major change in this version are the following:
* Added a prototype AMSR2 sea ice concentration.
* Uses the NASA Team 2 land spillover correction instead of the original NASA Team correction.
* Improved the Arctic pole hole filling.
* Uses a new land mask.
* The concentration variable (cdr_seaice_conc) contains concentration values only (no land mask).
* Added a separate surface type variable (surface_type_mask).
* Improved spatial interpolation of TBs.
* Includes the raw NT (raw_nt_seaice_conc) and BT (raw_bt_seaice_conc), maintaining full range of values instead of clipping at 100% for provenance and transparency.
* Updated the layout and names of variables, with added netCDF groups for better organization.
* Sea ice concentration values below 10% in the CDR are set to 0%.
* Fixed a bug in the BT tie points calculations.
* Fixed a bug in the one-sided temporal interpolation calculation.
* Added a prototype AMSR2 sea ice concentration.
* Uses the NASA Team 2 land spillover correction instead of the original NASA Team correction.
* Improved the Arctic pole hole filling.
* Uses a new land mask.
* The concentration variable (cdr_seaice_conc) contains concentration values only (no land mask).
* Added a separate surface type variable (surface_type_mask).
* Improved spatial interpolation of TBs.
* Includes the raw NT (raw_nt_seaice_conc) and BT (raw_bt_seaice_conc), maintaining full range of values instead of clipping at 100% for provenance and transparency.
* Updated the layout and names of variables, with added netCDF groups for better organization.
* Sea ice concentration values below 10% in the CDR are set to 0%.
* Fixed a bug in the BT tie points calculations.
* Fixed a bug in the one-sided temporal interpolation calculation.
Overview
As of June 2026, this data set is retired and no longer available for download. This data set provides a near-real-time Climate Data Record (CDR) of sea ice concentration from passive microwave data. The Near-real-time NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration (NRT CDR) data set is the near-real-time version of the final NOAA/NSIDC Climate Data Record of Passive Microwave Sea Ice Concentration (G02202). The NRT CDR is designed to fill the temporal gap between updates of the final CDR, occurring every three to six months, and to provide the most recent data.
Parameter(s):
SEA ICE CONCENTRATION
Platform(s):
DMSP 5D-3/F17
GCOM-W1
Sensor(s):
AMSR2
SSMIS
Data Format(s):
NetCDF
Temporal Coverage:
- 1 January 2025 to 15 January 2026
Temporal Resolution:
- 1 day
Spatial Resolution:
- 25 km
- 25 km
Spatial Reference System(s):
- NSIDC Sea Ice Polar Stereographic NorthEPSG:3411
- NSIDC Sea Ice Polar Stereographic SouthEPSG:3412
Spatial Coverage:
- Northern latitude90Southern latitude30.1Eastern longitude180Western longitude-180
- Northern latitude-39.2Southern latitude-90Eastern longitude180Western longitude-180
Blue outlined yellow areas on the map below indicate the spatial coverage for this data set.
Data Access & Tools
This data set has been retired. There is a more recent version of these data.
Documentation
User Guide
ATBDs
NSIDC Special Reports
Help Articles
General Questions & FAQs
NSIDC currently archives passive microwave sea ice concentration products based on two algorithms: the NASA Team algorithm and the Bootstrap algorithm. Both algorithms were developed by researchers at the NASA Goddard Space Flight Center in the 1980s.
How to Articles
NOAA@NSIDC data recently transitioned to HTTPS. The directory structure has NOT changed, but the beginning of the URL has changed from:ftp://sidads.colorado.edu/pub/DATASETS/to:
Currently three NOAA@NSIDC data sets are available in NOAA's PolarWatch Data Catalog. Please note that in the catalog the Climate Data Record (CDR) data sets are split up into Antarctic and Arctic data sets: