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Use constraints
Using this graphic and referring to it is encouraged, and please use it in presentations, web pages, newspapers, blogs and reports. For any form of publication, please include the link to this page and give the cartographer/designer credit (in this case Hugo Ahlenius, UNEP/GRID-Arendal)
Source(s)
Duguay, C.R., Prowse, T.D., Bonsal, B., Brown, R.D., Lacroix, M. and Ménard, P. (2006). Recent trends in Canadian lake ice covers. Hydrological Processes, 20(4), 781-801
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Uploaded on Tuesday 21 Feb 2012
by GRID-Arendal
Trends in spring temperatures and ice break-up dates in Canada
Year:
2007
Author:
Hugo Ahlenius, UNEP/GRID-Arendal
Description:
In Canada, recent evidence indicates a shortening of the freshwater-ice season over much of the country with the reduction being mainly attributable to earlier break ups. These trends match those in surface air temperature during the last 50 years. For example, similar spatial and temporal patterns have been found between trends (1966 to 1995) in autumn and spring 0°C isotherms (lines on a map showing location of 0°C air temperatures) and lake freeze-up and break-up dates, with generally significant trends toward earlier springs and earlier break-up dates over most of western Canada and little change in the onset of cooler temperatures and in freeze-up dates over the majority of the country in autumn.
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