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| Titel |
Glacier change in the Cariboo Mountains, British Columbia, Canada (1952-2005) |
| VerfasserIn |
M. J. Beedle, B. Menounos, R. Wheate |
| 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 ; 9, no. 1 ; Nr. 9, no. 1 (2015-01-07), S.65-80 |
| Datensatznummer |
250116736
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| Publikation (Nr.) |
 copernicus.org/tc-9-65-2015.pdf |
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| Zusammenfassung |
| We applied photogrammetric methods with aerial photography from 11 different
years between 1946 and 2005 to assess changes in area and volume of 33 glaciers
in the Cariboo Mountains of British Columbia for the latter half of the
20th century. These are used to identify changes in extent and
elevation primarily for the periods 1952–1985, 1985–2005, and 1952–2005. All
glaciers receded during the period 1952–2005; area retreat averaged −0.19 ± 0.05 % a−1.
From 1952 to 1985, nine glaciers advanced;
following 1985, retreat rates accelerated to −0.41 ± 0.12% a−1.
Thinning rates of a subset of seven glaciers likewise accelerated,
from −0.14 ± 0.04 m w.e. a−1 (1952–1985) to −0.50 ± 0.07 m w.e. a−1
for the period 1985–2005. Temperatures increased from the
earlier to the latter period for the ablation (+0.38 °C) and
accumulation (+0.87 °C) seasons, and average precipitation
decreased, particularly in the accumulation season (−32 mm, −3.2%). Our
comparison of surface area change with glacier morphometry corroborates
previous studies that show primary relations between extent change and
surface area. We also find that the strength and sign of these relations
varied for different epochs. Our results also indicate that the 1985 glacier
extent for the study area reported previously by other studies may be
slightly overestimated due to errant mapping of late-lying snow cover. |
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