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Abstract: NOTE: This data set has been replaced by the Sea Ice Charts of the Russian Arctic in Gridded Format, 1933-2006 data set. 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.

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Link: GET DATA > ECHO
Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.


Link: VIEW PROJECT HOME PAGE
Description: Global Digital Sea Ice Data Bank (GDSIDB)


Link: VIEW PROJECT HOME PAGE
Description: Sea Ice Products at NSIDC


Link: VIEW RELATED INFORMATION
Description: All About EASE-Grid


Link: VIEW RELATED INFORMATION
Description: National Ice Center Arctic Sea Ice Charts and Climatologies in Gridded Format


Link: VIEW RELATED INFORMATION
Description: Sea Ice Charts of the Russian Arctic in Gridded Format, 1933-2006


Geographic Coverage
 N: 90.0 S: 45.0  E: 105.0  W: -130.0
 N: 90.0 S: 68.0  E: 110.0  W: -24.0

Data Set Citation
Dataset Originator/Creator: Fetterer, F.
Dataset Title: AARI 10-Day Arctic Ocean EASE-Grid Sea Ice Observations
Dataset Release Date: 1997-06-15
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: NSIDC: National Snow and Ice Data Center
Online Resource: http://nsidc.org/data/nsidc-0050.html


Temporal Coverage
Start Date: 1953-01-01
Stop Date: 1990-12-30


Location Keywords
OCEAN > ARCTIC OCEAN > BARENTS SEA
OCEAN > ARCTIC OCEAN > BEAUFORT SEA
OCEAN > ARCTIC OCEAN > CHUKCHI SEA
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GREENLAND SEA
OCEAN > PACIFIC OCEAN > NORTH PACIFIC OCEAN > BERING SEA
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 12.5 km
Longitude Resolution: 12.5 km
Temporal Resolution: 10 days


Science Keywords
CRYOSPHERE >SEA ICE >ICE EXTENT    [Definition]
CRYOSPHERE >SEA ICE >ICE GROWTH/MELT    [Definition]
CRYOSPHERE >SEA ICE >ICE TYPES    [Definition]
CRYOSPHERE >SEA ICE >SEA ICE AGE    [Definition]
CRYOSPHERE >SEA ICE >SEA ICE CONCENTRATION    [Definition]
CRYOSPHERE >SNOW/ICE >ICE EXTENT    [Definition]
OCEANS >SEA ICE >ICE EXTENT    [Definition]
OCEANS >SEA ICE >ICE TYPES    [Definition]
OCEANS >SEA ICE >POLYNYAS    [Definition]
OCEANS >SEA ICE >SEA ICE AGE    [Definition]
TERRESTRIAL HYDROSPHERE >SNOW/ICE >ICE EXTENT    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
OCEANS


Instrument
DIGITIZER    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]


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.


Keywords
Arctic
ICE CHARTS
Ice Form
North Polar Basin
Sea Ice Concentration
Sea Ice Extent
Sea Ice Form
Sea Ice Stage Of Development
Stage Of Development


Data Set Progress
COMPLETE


Data Center
NSIDC Distributed Active Archive Center    [Information]
Data Center URL: http://nsidc.org/daac/index.html

Data Center Personnel
Name: NSIDC USER SERVICES
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


National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: NSIDC USER SERVICES
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


National Oceanic and Atmospheric Administration at the National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org/noaa/

Data Center Personnel
Name: NSIDC NOAA USER SERVICES
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


Personnel
FLORENCE FETTERER
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


NSIDC USER SERVICES
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 the National 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. Special 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
DIF Creation Date: 1997-06-15
Last DIF Revision Date: 2013-08-14

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