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| Titel |
The fate of lake ice in the North American Arctic |
| VerfasserIn |
L. C. Brown, C. R. Duguay |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 5, no. 4 ; Nr. 5, no. 4 (2011-10-20), S.869-892 |
| Datensatznummer |
250002747
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| Publikation (Nr.) |
 copernicus.org/tc-5-869-2011.pdf |
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| Zusammenfassung |
| Lakes comprise a large portion of the surface cover in northern North
America, forming an important part of the cryosphere. The timing of lake ice
phenological events (e.g. break-up/freeze-up) is a useful indicator of
climate variability and change, which is of particular relevance in
environmentally sensitive areas such as the North American Arctic. Further
alterations to the present day ice regime could result in major ecosystem
changes, such as species shifts and the disappearance of perennial ice
cover. The Canadian Lake Ice Model (CLIMo) was used to simulate lake ice
phenology across the North American Arctic from 1961–2100 using two climate
scenarios produced by the Canadian Regional Climate Model (CRCM). Results
from the 1961–1990 time period were validated using 15 locations across the
Canadian Arctic, with both in situ ice cover observations from the Canadian
Ice Database as well as additional ice cover simulations using nearby
weather station data. Projected changes to the ice cover using the 30-year
mean data between 1961–1990 and 2041–2070 suggest a shift in break-up and
freeze-up dates for most areas ranging from 10–25 days earlier (break-up)
and 0–15 days later (freeze-up). The resulting ice cover durations show
mainly a 10–25 day reduction for the shallower lakes (3 and 10 m) and 10–30 day reduction for the deeper lakes (30 m). More extreme reductions of
up to 60 days (excluding the loss of perennial ice cover) were shown in the
coastal regions compared to the interior continental areas. The mean maximum
ice thickness was shown to decrease by 10–60 cm with no snow cover and 5–50 cm with
snow cover on the ice. Snow ice was also shown to increase
through most of the study area with the exception of the Alaskan coastal
areas. |
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