AARI 10-Day Arctic Ocean EASE-Grid Sea Ice Observations
Entry ID:
NSIDC-0050
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Summary
Abstract:
NOTE: This data set has been replaced by the Sea Ice Charts of the Russian Arctic in Gridded Format, 1933-2006 data set ( http://nsidc.org/data/g02176.html). These gridded ice charts represent a reformatting of information contained in another data set, the Russian Arctic and Antarctic Research Institute's (AARI) 10 Day Digital Arctic Sea Ice Charts. AARI digitized Arctic sea ice concentration ... and stage of development charts as part of an international data exchange program. The AARI source charts, similar to operational charts distributed by the National Ice Center describing ice type and constitution, were developed from aircraft and satellite observations for shipping purposes, and provide extremely detailed information. Such data are particularly valued in process studies tracking the growth and recession of polynyas, or for looking at the preponderance of ice at certain stages of development in a particular area. NSIDC does not maintain the operational charts, but archives the AARI digitized version. However, the Arctic and Antarctic Research Institute (AARI) 10 Day Digital Arctic Sea Ice Charts were encoded in SIGRID (Sea Ice Grid) format, which assigns numerical values to ice parameters and records them at specific lat/lon grid points. But due to the difficulties of visualizing, extracting and working with data in SIGRID, NSIDC is now providing AARI data in NSIDC's Equal Area SSM/I Earth Grid. The EASE-Grid format makes it especially easy to compare observed ice concentrations or ice types with the same parameters derived from satellite data (such as ice concentrations from passive microwave sensors). AARI sea ice data in the EASE-Grid projection are gridded at a 12.5 km resolution, for both Western (24W to 110E) and Eastern (105E to 130W) sectors . Data extend from 1953 through 1990, and are available via ftp in compressed tar format. Postscript (.ps) files depicting coverage per year are also provided with the data. 
Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
Data Set Citation
Dataset Title:
AARI 10-Day Arctic Ocean EASE-Grid Sea Ice Observations
Dataset Release Place:
Boulder, CO U.S.A.
Dataset Publisher:
National Snow and Ice Data Center (NSIDC)
Online Resource:
http://nsidc.org/data/nsidc-0050.html
Temporal Coverage
Start Date:
1953-01-01
Stop Date:
1990-12-30
Data Resolution
Temporal Resolution:
thrice monthly
Temporal Resolution Range:
Weekly - < Monthly
Quality
It is impossible to assess errors that might have occurred in translating ice observations to the original operational charts and to SIGRID files, since these steps were performed at AARI. However, AARI estimates that ice edge boundaries are generally accurate to between 2 and 10 km under typical ice reconnaissance conditions, and to within 50 km under the worst conditions. Quality control routines assessed the 'correctness' of the AARI coding (i.e., checked whether the AARI implementation of SIGRID matched the published standard). Few errors were found in AARI's coding of the files.
Access Constraints
These data are freely available to the public.
Use Constraints
None.
Data Set Progress
COMPLETE
Distribution
Distribution Media:
ftp
Distribution Size:
annual files
Distribution Format:
compressed tar
Fees:
free
Personnel
Role:
INVESTIGATOR
Phone:
+1 (303) 492-6199
Fax:
+1 (303) 492-2468
Email:
fetterer at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City:
Boulder
Province or State:
CO
Postal Code:
80309-0449
Country:
USA
Role:
INVESTIGATOR
Phone:
303-236-1359
Fax:
303-236-3200
Email:
raymond at usgs.gov
Contact Address:
U.S. Geological Survey Spectroscopy Laboratory
MS 973 Box 25046
Denver Federal Center
City:
Denver
Province or State:
CO
Postal Code:
80225
Country:
USA
Role:
TECHNICAL CONTACT
Phone:
+1 (303) 492-6199
Fax:
+1 (303) 492-2468
Email:
nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City:
Boulder
Province or State:
CO
Postal Code:
80309-0449
Country:
USA
Publications/References
Bushuev, A. V., R. G. Barry, V. M. Smolyanitsky, and V. J. Troisi. 1994. Format to Provide Sea Ice Data for the World Climate Program (SIGRID-2). Unpublished report to the World Meteorological Organization Commission for Marine Meteorology. Environment Canada. 1989. Ice Charts: WMO Symbols for the Hatching of Total Concentration of Ice. Manual of Standard Procedures for Observing and Reporting ... Ice Conditions. Atmospheric Environment Service, Ottawa Ontario. p. 3-21 - 3-31. Environment Canada. 1992. Ice Terminology: Ice Codes and Symbols, Egg Code. MANIS, Manual of Ice Services. Atmospheric Environment Service. Ottawa, Ontario. sect. A.3. Kokaly, Raymond F. 1996. Format for Gridded Sea Ice Information (SIGRID). Special Report to theNational Snow and Ice Data Center, Boulder, Colorado. Kokaly, Raymond F. 1996. An Evaluation of the Results from Using Nearest Neighbor and Area Min/Max Resampling Methods to Regrid AARI Digitized Sea Ice Charts to EASE-Grid. S
pecial Report to theNational Snow and Ice Data Center, Boulder, Colorado. Thomas Thompson. 1981. Proposed Format for Gridded Sea Ice Information (SIGRID). Unpublished report prepared for the World Climate Programme.
Creation and Review Dates
Last DIF Revision Date:
2011-06-30
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