The results of this analysis are published here as an electronic NOAA Great Lakes Ice Atlas. Detailed documentation and description of analysis methods, and a discussion of the resulting products, will supplement this atlas as a series of reports. The first report in that series (Assel, Norton, and Cronk, 2002) describes the original data set and is included here. Other reports, journal articles, and ancillary data will be added as they become available. See Reference section below for updates. Please cite this atlas (Assel, 2003) and those reports when using these data.
This Atlas contains approximately 1.4-gigabytes of data, much of which
is in compressed files (about 4-gigabytes when uncompressed). Because
of its large size it is not practical to download the entire atlas from
the Internet. Therefore, it is also being made available on CD-ROM and
DVD formats. To request a copy of the atlas on CD-ROM or DVD send an email
Data and Analysis Products
Analysis Products. There are three analysis products. The first product includes ice charts of the following: dates of the first reported ice, dates of the last reported ice, and ice duration for each winter, as well as, the maximum, minimum and average ice cover concentrations.
The second product is the 30-year annual daily ice cover time series. The daily time series was used to create: 1) computer animations of spatial patterns of ice cover for each winter, 2) line plots of lake averaged ice cover for each lake over the 30 winters.
The third product is weekly statistics. There are weekly ice charts and grids of: maximum, 3rd quartile, median, 1st quartile, and minimum ice cover concentrations for the 30-winter base period. The weekly statistics are based on the original ice chart data set and not on the daily time series.
Links for each product noted above contain an introductory section with pertinent information on file names, structure, and data. Secondary documentation links provide additional details in some cases. General background on the overall NOAA Great Lakes Ice Atlas is provided in the Read Me file. It is highly recommended that users read this background information prior to accessing the data.
Assel, R.A. 2004. Lake Erie ice cover climatology - basin averaged ice cover: winters 1898-2002. NOAA Technical Memorandum GLERL-128. NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI, 15 pp. http://www.glerl.noaa.gov/ftp/publications/tech_reports/glerl-128/tm-128.pdf
Assel, R.A. 2003. Great Lakes monthly and seasonal accumulations of freezing degree days - winters 1898-2002. NOAA Technical Memorandum GLERL-127. NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI, 36 pp. http://www.glerl.noaa.gov/ftp/publications/tech_reports/glerl-127/tm-127.pdf
Assel, R.A. 2003. Great Lakes Ice Cover, First Ice, Last Ice, and Ice Duration: Winters 1973-2002. NOAA TM GLERL-125. Great Lakes Environmental Research Laboratory, Ann Arbor, MI. http://www.glerl.noaa.gov/ftp/publications/tech_reports/glerl-125/tm-125.pdf
Assel, R.A., K. Cronk, and D.C. Norton. 2003. Recent trends in Laurentian Great Lakes ice cover. Climatic Change 57:185-204. http://www.glerl.noaa.gov/pubs/fulltext/2003/20030001.pdf.
Assel, R.A. 2003. Great Lakes ice cover-winter 2003 compared with GLERL's 30-winter ice cover climatology. NOAA Great Lakes Environmental Research Laboratory, Ann Arbor, MI, 2 pp. http://www.glerl.noaa.gov/pubs/brochures/ice/icechart2003.pdf
Assel, R.A. 2003. An Electronic Atlas of Great Lakes Ice Cover. NOAA Great Lakes Ice Atlas, Great Lakes Environmental Research Laboratory, Ann Arbor, Michigan 48105.
Assel, R.A., D. C. Norton, and K. C. Cronk. 2002. A Great Lakes Digital Ice Cover Data Base for Winters 1973_2000. NOAA Technical Memorandum GLERL_121, Great Lakes Environmental Research Laboratory, Ann Arbor, MI. http://www.glerl.noaa.gov/ftp/publications/tech_reports/glerl-121/tm-121.pdf
Assel, R.A. and D.C. Norton. 2001. Visualizing Laurentian Great Lakes ice cycles. EOS Transactions 82(7):83. http://www.agu.org/eos_elec/00259e.html.
Assel, R.A., F.H. Quinn, G.A. Leshkevich, and S.J. Bolsenga, 1983. Great Lakes Ice Atlas. NOAA Atlas No. 4. Great Lakes Environmental Research Laboratory, Ann Arbor, MI.
Assel, R.A., 1983. A Computerized Ice Concentration Data Base for the
Great Lakes. NOAA DR ERL GLERL-24. Great Lakes Environmental Research
Laboratory, Ann Arbor, MI. http://www.glerl.noaa.gov/ftp/publications/tech_reports/glerl-024/dr-024.pdf
Specific products and manufacturers are mentioned throughout the NOAA Ice Atlas. Mention of these products or manufacturers does not constitute an endorsement by GLERL, NOAA, or the Department of Commerce.