| Northern Hemisphere EASE-Grid 2.0 Weekly Snow Cover and Sea Ice Extent, Version 4 User Guide | User Guide | 638.47 KB |
| Northern Hemisphere EASE-Grid Annual Freezing and Thawing Indices, 1901 - 2002 | User Guide | 175.94 KB |
| Northern Hemisphere Seasonal and Intermittent Frozen Ground Areas 1901-2001 | User Guide | 100.28 KB |
| Norwegian North Polar Expedition 1893-1896: Oceanographic Data, Version 1 User Guide | User Guide | 200.39 KB |
| NSCAT Twice-Daily SIR-Enhanced Scatterometer EASE-Grid 2.0 Radar Backscatter Algorithm Theoretical Basis Document, Version 1.1 | ATBDs | 39.15 MB |
| NSIDC-0079 v004 User Guide [2023] | User Guide | 264.81 KB |
| NSIDC-0450 Technical Reference | ATBDs | 84.66 KB |
| NSIDC-0451 Daily Global Land Parameters Derived from AMSR-E and AMSR2 V2 | General Resources | 1.61 MB |
| NSIDC-0481 Temporal Coverage by Grid and by Year | General Resources | 149.24 KB |
| NSIDC-0720 Instrument Coverage By Year | General Resources | 15.44 KB |
| NSIDC-0738 rSIR_SMAP Algorithm Theoretical Basis Document Version 2 [2021] | ATBDs | 6.44 MB |
| NSIDC-0738 SMAP Twice-Daily rSIR-Enhanced EASE-Grid 2.0 Brightness Temperatures Algorithm Theoretical Basis Document, Version 1.0 | ATBDs | 6.38 MB |
| NSIDC-0774 Algorithm Theoretical Basis Document Version 1 [2023] | ATBDs | 15.73 MB |
| NSIDC-0797-V001-UserGuide | User Guide | 248.43 KB |
| NWS Technical Procedures Bulletin No. 490 RUC20 - The 20-km version of the Rapid Update Cycle | Validation Campaign Documents | 1.39 MB |
| Observation-Corrected Precipitation for SMAP L4 Soil Moisture Products (v.6) and the GEOS R21C Reanalysis | General Resources | 404.11 KB |
| Observations for SEARCH: Data Integration for Arctic Reanalysis and Change Detection | General Resources | 2.71 MB |
| OIB Alaska Radar HDF5 Format Description and Processing Information | General Resources | 115.1 KB |
| On-Ice Arctic Sea Ice Thickness Measurements by Auger, Core, and Electromagnetic Induction, From the Fram Expedition Onward | User Guide | |
| On-Ice Arctic Sea Ice Thickness Measurements by Auger, Core, and Electromagnetic Induction, From the Fram Expedition Onward, Version 1 User Guide | User Guide | |