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| Titel |
Little Ice Age climate reconstruction from ensemble reanalysis of Alpine glacier fluctuations |
| VerfasserIn |
M. P. Lüthi |
| 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 ; 8, no. 2 ; Nr. 8, no. 2 (2014-04-14), S.639-650 |
| Datensatznummer |
250116091
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| Publikation (Nr.) |
 copernicus.org/tc-8-639-2014.pdf |
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| Zusammenfassung |
| Mountain glaciers sample a combination of climate fields – temperature,
precipitation and radiation – by accumulation and melting of ice. Flow
dynamics acts as a transfer function that maps volume changes to a length
response of the glacier terminus. Long histories of terminus positions have
been assembled for several glaciers in the Alps. Here I analyze terminus
position histories from an ensemble of seven glaciers in the Alps with
a macroscopic model of glacier dynamics to derive a history of glacier
equilibrium line altitude (ELA) for the time span 400–2010 C.E. The
resulting climatic reconstruction depends only on records of glacier
variations. The reconstructed ELA history is similar to recent
reconstructions of Alpine summer temperature and Atlantic Multidecadal
Oscillation (AMO) index, but bears little resemblance to reconstructed
precipitation variations. Most reconstructed low-ELA periods coincide with
large explosive volcano eruptions, hinting at a direct effect of volcanic
radiative cooling on mass balance. The glacier advances during the LIA, and
the retreat after 1860, can thus be mainly attributed to temperature and
volcanic radiative cooling. |
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