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| Titel |
Spatial analyses of thermokarst lakes and basins in Yedoma landscapes of the Lena Delta |
| VerfasserIn |
A. Morgenstern, G. Grosse, F. Günther, I. Fedorova, L. Schirrmeister |
| 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 (2011-10-19), S.849-867 |
| Datensatznummer |
250002746
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| Publikation (Nr.) |
 copernicus.org/tc-5-849-2011.pdf |
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| Zusammenfassung |
| Distinctive periglacial landscapes have formed in late-Pleistocene ice-rich
permafrost deposits (Ice Complex) of northern Yakutia, Siberia. Thermokarst
lakes and thermokarst basins alternate with ice-rich Yedoma uplands. We
investigate different thermokarst stages in Ice Complex deposits of the Lena
River Delta using remote sensing and geoinformation techniques. The
morphometry and spatial distribution of thermokarst lakes on Yedoma uplands,
thermokarst lakes in basins, and thermokarst basins are analyzed, and
possible dependence upon relief position and cryolithological context is
considered. Of these thermokarst stages, developing thermokarst lakes on
Yedoma uplands alter ice-rich permafrost the most, but occupy only 2.2%
of the study area compared to 20.0% occupied by thermokarst basins. The
future potential for developing large areas of thermokarst on Yedoma uplands
is limited due to shrinking distances to degradational features and delta
channels that foster lake drainage. Further thermokarst development in
existing basins is restricted to underlying deposits that have already
undergone thaw, compaction, and old carbon mobilization, and to deposits
formed after initial lake drainage. Future thermokarst lake expansion is
similarly limited in most of Siberia's Yedoma regions covering about
106 km2, which has to be considered for water, energy, and carbon
balances under warming climate scenarios. |
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