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| Titel |
Glacial history of the Haizishan Plateau reconstructed from geomorphology, exposure dating and numerical modelling |
| VerfasserIn |
Ping Fu, Julien Seguinot, Arjen P. Stroeven, Jonathan M. Harbor |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094899
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| Publikation (Nr.) |
 EGU/EGU2014-10334.pdf |
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| Zusammenfassung |
| The Haizishan Plateau is a low-relief formerly glaciated highland located at a crossroads of
continental climate on the Tibetan Plateau and the south-west Asian monsoon. It is
surrounded by deeply-cut glacial and fluvial valleys on its flanks, deep basins, and high
mountain peaks. Using geomorphological mapping, 10Be exposure dating, and numerical
glacier modelling we provide a detailed reconstruction of the Haizishan Plateau glacial
history. An ice cap measuring almost 4 000 km2 formed at or before marine oxygen isotope
stage 6 (with minimum ages of 102.3±10.0 – 183.6±17.0 ka), and, with a slightly
smaller extent, during the global last glacial maximum (21.6±2.0 ka). The dating
results are consistent with geomorphology in showing a pattern of patchy glacial
erosion on the Haizishan Plateau. Modelling results also support this inference
through a patchy pattern of basal temperatures on the plateau surface, and warm-based
ice at outlet valleys. Finally, our simulations show that only ca. 3 °C of cooling is
required for glacial inception and expansion of the ice cap to its geomorphologically
inferred maximum extent, which is consistent with glacial modelling results obtained
at other locations on the Tibetan Plateau and consistent with climate modelling. |
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