Call number:
ZSP-201-80/6
In:
CRREL Report, 80-6
Description / Table of Contents:
Weekly measurements of the thickness of lake, river and fast sea ice made over a period of 10 to 15 years at 66 locations in Canada and Alaska are analyzed, and the portion of the data relating to maximum ice thickness and decay (i.e. the decrease in ice thickness) is examined. Ice thickness curves revealed individual patterns of ice decay, and comparisons between locations disclosed major contrasts in the amount of ice accretion and the times of maximum ice and ice clearance. Although many factors affect the ice decay process, this study investigates in detail the effect of thawing temperatures. Concurrent measurements of the air temperature at each location made it possible to analyze the relationship between accumulated thawing degree-days (ATDD) and ice cover decay. Other factors affecting ice ablation and breakup, such as snow-ice formation, snow cover depth, solar radiation and wind are also discussed.
Type of Medium:
Series available for loan
Pages:
v, 160 Seiten
,
Illustrationen
Series Statement:
CRREL Report 80-6
URL:
https://cdm16021.contentdm.oclc.org/digital/collection/p266001coll1/id/6395
URL:
https://hdl.handle.net/11681/9526
Language:
English
Note:
CONTENTS
Abstract
Preface
Introduction
Data sources and literature review
Canada
Alaska
Data tabulation
Station selection
Description of tabulated data
Station location and ice measurement site descriptions
Review of previous studies on maximum ice in North America
Maximum ice thickness maps
Date of maximum ice
Plotting of the ice decay curves
General procedures
Categories of water bodies
Ice decay at sea ice locations
Envelope curves
Average curves
Snow-ice formation
Ice decay at lake ice locations
Average curves
Regional variations and similarities
Ice decay at river ice locations
Variations in ice thickness
Rapid ice clearance
Comparison between Alaskan and Canadian river ice decay curves
Incremental extraction of ice decay data for analysis purposes
Selection of ice decay intervals
Preliminary evaluation of the methodology
Further considerations of the methodology
Relationships between ice decay and thawing air temperatures
Average daily vs maximum daily air temperature
10-day increments vs accumulated values
Total years vs year-to-year analysis
Evaluation of use of 0°C as a base
Final format of the relationship between ice decay and ATDD
Evaluation of the final form
Possible causes for variations in slope values
Decreasing sea ice thickness and thawing air temperatures
Factors affecting sea ice decay
Relationship between ATDD and sea ice decay
Influence of solar radiation and wind on sea ice decay
Literature cited Selected bibliography
Appendix A. Ice thickness measurements and other related (or associated) observations for stations in Canada and Alaska
Appendix B. Maps of least and greatest ice thickness observed at the time of maximum growth, and average date of occurrence
Appendix C. Annual ice decay curves for stations in Canada and Alaska
Location:
AWI Archive
Branch Library:
AWI Library