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| Titel |
Insight into glacier climate interaction: reconstruction of the mass balance field using ice extent data |
| VerfasserIn |
Vjeran Visnjevic, Frederic Herman, Aleksandar Licul |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250132711
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| Publikation (Nr.) |
 EGU/EGU2016-13243.pdf |
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| Zusammenfassung |
| With the end of the Last Glacial Maximum (LGM), about 20 000 years ago, ended the most
recent long-lasting cold phase in Earth’s history. We recently developed a model that
describes large-scale erosion and its response to climate and dynamical changes with
the application to the Alps for the LGM period. Here we will present an inverse
approach we have recently developed to infer the LGM mass balance from known
ice extent data, focusing on a glacier or ice cap. The ice flow model is developed
using the shallow ice approximation and the developed codes are accelerated using
GPUs capabilities. The mass balance field is the constrained variable defined by
the balance rate β and the equilibrium line altitude (ELA), where c is the cutoff
value:
b = max(β⋅(S(z) – ELA), c)
We show that such a mass balance can be constrained from the observed past ice extent
and ice thickness. We are also investigating several different geostatistical methods to
constrain spatially variable mass balance, and derive uncertainties on each of the mass
balance parameters. |
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