G02173
Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas, 1993-2004
Eicken, H., L. Shapiro, A. G. Gaylord, A. Mahoney, and P. W. Cotter.
Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas, 1993-2004
2009-06-17
Boulder, Colorado USA
NSIDC: National Snow and Ice Data Center
http://nsidc.org/data/g02173.html
http://dx.doi.org/10.7265/N5SB43P0
Investigator
Hajo
Eicken
University of Alaska Fairbanks
Geophysical Institute
P.O. Box 757320
Fairbanks
AK
99775-7320
USA
Investigator
Lewis
Shapiro
University of Alaska Fairbanks
Geophysical Institute
Fairbanks
AK
99775-7320
USA
Investigator
Allison
Graves Gaylord
NunaTech@usa.net
1 907 852-4881
1 907 852-4882
Nuna Technologies
P.O. Box 1483
Homer
AK
3
Technical Contact
NSIDC
User Services
nsidc@nsidc.org
1 303 492-6199 x
1 303 492-2468 x
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder
CO
80309-0449
USA
Investigator
P
W
Cotter
Geophysical Institute, University of Alaska, Fairbanks
EARTH SCIENCE
Cryosphere
Sea Ice
Ice Edges
EARTH SCIENCE
Cryosphere
Sea Ice
Ice Edges
EARTH SCIENCE
Cryosphere
Sea Ice
Ice Extent
EARTH SCIENCE
Cryosphere
Sea Ice
Ice Extent
EARTH SCIENCE
Cryosphere
Sea Ice
Leads
EARTH SCIENCE
Cryosphere
Sea Ice
Leads
EARTH SCIENCE
Oceans
Sea Ice
Ice Edges
EARTH SCIENCE
Oceans
Sea Ice
Ice Edges
EARTH SCIENCE
Oceans
Sea Ice
Ice Extent
EARTH SCIENCE
Oceans
Sea Ice
Ice Extent
EARTH SCIENCE
Oceans
Sea Ice
Leads
EARTH SCIENCE
Oceans
Sea Ice
Leads
Climatology/Meteorology/Atmosphere
AVHRR
Beaufort Sea
Chukchi Sea
Infrared
landfast ice
Leads
NOAA
RADARSAT-1
Radarsat imagery
SAR imagery
Sea Ice Extent
Visible Imagery
AVHRR
Advanced Very High Resolution Radiometer
SAR
Synthetic Aperture Radar
NOAA-12
National Oceanic & Atmospheric Administration-12
NOAA-14
National Oceanic & Atmospheric Administration-14
NOAA-15
National Oceanic & Atmospheric Administration-15
NOAA-16
National Oceanic & Atmospheric Administration-16
NOAA-17
National Oceanic & Atmospheric Administration-17
RADARSAT-1
1993-12-09
2004-07-29
complete
68.48204
73.95769
-164.08084
-129.87714
OCEAN
ARCTIC OCEAN
BEAUFORT SEA
OCEAN
ARCTIC OCEAN
CHUKCHI SEA
1.1 km
1.1 km
100 m
100 m
Note: NSIDC did not perform a quality assessment of the data.
Landfast Ice Extent:
The manual process for identifying landfast ice extent has subjectivity. However, this subjectivity was reduced by using a gradient difference. Refer to the landfast ice extent Data Processing section of this document for more information on the gradient difference.
The following is a list of the quality checks performed on the landfast ice (Mahoney et al. 2005): * Data were checked for adequate coverage over the study area (subregions 2-11). * Images with a large geolocation error were identified and either corrected or disregarded.
* The geolocation accuracy could create collocation errors of up to 10 pixels or 1 km between parts of two mosaics.
Leads:
The following checks were performed on the AVHRR data:
* Manually examined all scenes and excluded images or image sections with any trace of cloud cover or ambiguous lead/cloud features to keep the potential source of error due to clouds and fog to a minimum.
* Classified lead/ice images were compared to ship-based observations of lead fractions in May and June of 2004 and found to be in reasonable agreement with a deviation of two and one percentage-point, respectively.
English
NSIDC_NOAA
NSIDC
National Snow and Ice Data Center
http://nsidc.org
Data Center Contact
NSIDC
User Services
nsidc@nsidc.org
1 303 492-6199
1 303 492-2468
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder
CO
80309-0449
USA
NSIDC_NOAA
NSIDC National Oceanic and Atmospheric Administration
http://nsidc.org/noaa/
Data Center Contact
NSIDC NOAA
User Services
nsidc@nsidc.org
1 303 492-6199
1 303 492-2468
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder
CO
80309-0449
USA
FTP
.1 - 30 MB
ESRI Grid
FTP
.1 - 30 MB
ESRI Interchange
FTP
.1 - 30 MB
ESRI Shapefiles
FTP
.1 - 30 MB
GeoTIFF
FTP
.1 - 30 MB
JPEG
FTP
.1 - 30 MB
Microsoft Excel
FTP
15 - 22 KB
XML
FTP
7 - 86 MB
Microsoft Access
Eicken, H., L. Shapiro, A. G. Gaylord, A. Mahoney, and P. Cotter. 2006. Mapping and Characterization of Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas. Final Report, Minerals Management Service OCS Study MMS 2005-068.
Eicken, H., R. Gradinger, A. Graves, A. Mahoney, I. Rigor, and H. Melling. 2005. Sediment Transport by Sea Ice in the Chukchi and Beaufort Seas: Increasing Importance Due to Changing Ice Conditions? Deep-Sea Research II 52: 3281-3302.
Fett, R. W., R. E. Englebretson, and S. D. Burk. 1997. Technologies for Analyzing Lead Condition in Visible, Infrared and Microwave Satellite Imagery. Journal of Geophysical Research 102: 13657-13671.
Key, J. R., R. Stone, J. A. Maslanik, and E. Ellefsen. 1993. The Detectability of Sea-Ice Leads in Satellite Data as a Function of Atmospheric Conditions and Measurement Scale, Annals of Glaciology 17: 227-232.
Kwok, R. and G. F. Cunningham. 1994. Use of Time Series SAR Data to Resolve Ice Type Ambiguities in Newly Opened Leads. IGARSS'94: International Geoscience and Remote Sensing Symposium. Surface and Atmospheric Remote Sensing: Technologies, Data Analysis, and Interpretation: 1024-1026.
Lindsay, R. W. and D. A. Rothrock. 1995. Arctic Sea Ice Leads from Advanced Very High Resolution Radiometer Images. Journal of Geophysical Research 100: 4533-4544.
Mahoney, A. 2006. 'Alaska Landfast Sea Ice Dynamics.' Ph.D. Thesis, University of Alaska Fairbanks, Fairbanks, AK, August 2006.
Mahoney, A., H. Eicken, L. Shapiro, and A. Graves. 2005. Defining and Locating the Seaward Landfast Ice Edge in Northern Alaska. In: 18th International Conference on Port and Ocean Engineering under Arctic Conditions, J.P. Dempsey (Editor). POAC '05 Proceedings Volume 3, Potsdam, NY, June 26-30, 2005.
Mahoney, A., H. Eicken, A. G. Gaylord, and L. Shapiro. 2007. Alaska Landfast Sea Ice: Links with Bathymetry and Atmospheric Circulation. Journal of Geophysical Research 112, C02001.
Stroeve, J., M. Serreze, S. Drobot, S. Gearheard, M. Holland, J. Maslanik, W. Meier, and T. Scambos. 2008. Arctic Sea Ice Extent Plummets in 2007. EOS, 89(2), 8 January.
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.
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CEOS IDN DIF
9.7
2009-06-17
2013-03-12
Added DOI to metadata record