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Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas, 1993-2004, Version 1

In the Beaufort and Chukchi Seas, the most significant sea ice anomalies have occurred in the summer ice extent (Eicken et al. 2006). In addition, there has been a considerable decline in the multiyear ice pack in this region (Eicken et al. 2006). To help understand these anomalies, this data set contains information on recurring spring leads and landfast ice extent in this area. This data set maps and documents the spatial and temporal distribution of recurring leads and landfast ice off the coast of northern Alaska in the Chukchi and Beaufort Seas (Eicken et al. 2006). The leads data span from 1993 through 2004 and are based on visible and infrared Advanced Very High Resolution Radiometer (AVHRR) data onboard the NOAA 12, 14, 15, 16, and 17 satellites. The landfast ice extent data extend from 1996 through 2004 and are based on RADARSAT-1 Synthetic Aperture Radar (SAR) imagery. The data are available in a number of formats including ArcGIS geodatabases (.mdb), shapefiles (.shp), ArcGIS grids (.adf), ArcGIS grids in ArcInfo interchange format (.e00), and GeoTIFFs (.tif). Statistics are also provided in Microsoft Excel spreadsheets (.xls) and metadata in several formats including XML (.xml), SGML (.sgml), HTML (.html), and ASCII text (.txt). Quick-view browse images in JPEG (.jpg) format are provided for the shapefiles, grids, and GeoTIFFs. Data are available via FTP.

Geographic Coverage

Spatial Coverage:
  • N: 73.95769, S: 68.48204, E: -129.87714, W: -164.08084

Spatial Resolution:
  • 1.1 km x 1.1 km
  • 100 m x 100 m
Temporal Coverage:
  • 9 December 1993 to 29 July 2004
Temporal Resolution: Not specified
  • Sea Ice > Ice Edges
  • Sea Ice > Ice Extent
  • Sea Ice > Leads
Platform(s) NOAA-12, NOAA-14, NOAA-15, NOAA-16, NOAA-17, RADARSAT-1
Sensor(s): AVHRR, SAR
Data Format(s):
  • ESRI Grid
  • ESRI Interchange
  • Microsoft Excel
  • XML
  • Microsoft Access
  • ESRI Shapefile
  • GeoTIFF
  • JPEG
Version: V1
Data Contributor(s): Hajo Eicken, Lewis Shapiro, Allison Graves Gaylord, P Cotter

Data Citation

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.

Eicken, H., L. Shapiro, A. G. Gaylord, A. Mahoney, and P. W. Cotter. 2009. Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas, 1993-2004, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: [Date Accessed].
Questions? Please contact:

NSIDC User Services
Phone: 1 303 492-6199
Fax: 1 303 492-2468
Contact Address:
National Snow and Ice Data Center
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA