Call number:
ZSP-201-83/4
In:
CRREL Report, 83-4
Description / Table of Contents:
Measurements and analysis of seasonal ice growth and decay on Post Pond, New Hampshire, for the period 1973-1982 are presented. Observations included ice thickness measurements, examination of the various ice types contributing to the ice cover, and measurements of meteorological parameters for correlation with and modeling of the ice growth process. The overall nature of ice growth and decay (ice loss) on the Post Pond has been ascertained, the seasonal variability in the timing of freeze-up and ice-out and the duration of the ice cover have been determined, and the relationship of ice growth to freezing-degree-day (deg C) records evaluated on the basis of a Stefan conduction equation modified to deal with ice sheets covered with or free of snow. Ice growth occurs predominantly by the direct freezing of lake water, but snow ice may compose as much as 50% of the ice cover in winters with higher than average snowfall. Freeze-up leading to the establishment of a stable ice cover occurs during the 4-week period from the end of November to the end of December. Maximum seasonal ice thicknesses were from 45 to 67 cm and are generally attained during the first two weeks of March; ice-out, marking the final disappearance of ice from Post Pond, usually occurs by the third week of April. The overall rate of the ice loss is three to four times that of ice growth, and is dominated initially by melting from the top. As much as 50% of the ice may be lost in this way before the onset of any bottom melting. Final dissipation of the ice cover is usually expedited by candling resulting from preferential melting and disintegration of the ice at crystal boundaries.
Type of Medium:
Series available for loan
Pages:
iv, 30 Seiten
,
Illustrationen
Series Statement:
CRREL Report 83-4
URL:
https://apps.dtic.mil/docs/citations/ADA126334
URL:
https://hdl.handle.net/11681/9277
Language:
English
Note:
CONTENTS
Abstract
Preface
Introduction
Location of study
Study methods
Ice thickness
Ice-cover composition
Surface air temperatures
Freeze-up and ice-out characteristics
Results and discussion
Ice-growth record
Freezing-degree-day records
Ice-growth predictions
Summary and conclusions
Literature cited
Appendix A: Ice-growth records
Appendix B: Measured and computed ice-growth curves
Location:
AWI Archive
Branch Library:
AWI Library
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