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Freeze-up and break-up of lakes as an index of temperature changes during the transition seasons : a case-study for Finland

Author
Palecki, M. A.
Published
United States : [publisher not identified], 1985
Springfield, Va.: National Technical Information Service, [approximately 1985]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Barry, R. G.

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Summary
The statistical relationships between lake freeze-up/lake ice break-up dates and air temperature means over various time periods are analyzed for 63 lakes in Finland. Mean temperatures for the individual months before the lake event dates are strongly correlated with these dates; significant correlations hold for periods up to five months in length before freeze-up. Regression coefficients depend on location, but are consistent within regions. Latitude and distance from the coast are the most important sources of variation in the regression coefficients. The regression coefficients are used to translate changes in lake freeze-up/break-up dates into estimated changes in air temperature. In southern Finland a five day change in freeze-up data would represent a 1.1/sup 0/C change in November temperature of the same sign. A time series of November temperatures estimated from lake freeze-up dates is derived and compared with observations at Helsinki. The spatial pattern of temperature change over time is also examined using the freeze-up dates. Freeze-up/break-up dates provide a useful proxy for air temperature estimates in data-sparse regions of middle-high latitudes and could permit rapid satellite monitoring of climate perturbations. 25 refs., 9 figs., 5 tabs.
Report Numbers
DE86007545; DOE/ER/60106-3
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC02-83ER60106
OSTI Identifier 6106410
Research organization: Colorado Univ., Boulder (USA).
View MARC record | catkey: 47363566