Paleolimnological dynamics in the Alaskan Arctic: Climate drivers versus local disturbances


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Josefine.Lenz [ at ] awi.de

Abstract

Arctic landscape dynamics are thought to be a direct indicator of global change. The degradation of ice-rich permafrost since the Pleistocene-Holocene transition is believed to be responsible for the formation of numerous thermokarst lakes. However, these lakes typically undergo a cycle of initiation, expansion, drainage, and re-initiation that may or may not be coupled to global change. Our study of a recently drained lake basin in Arctic Alaska (USA) provides insights into past landscape dynamics in the continuous permafrost region. We applied a multi-proxy approach on a sediment core using bioindicators, as well as sedimentological and biogeochemical methods. Our investigation demonstrates that lake development in the permafrost-affected terrestrial Arctic can be triggered but also interrupted by global climate change (e.g. rapid warming and wetting in the Early Holocene), regional environmental dynamics (e.g. nearby volcanic eruptions and tephra deposition) or local disturbance processes (e.g. lake drainage). The present study emphasizes that Arctic lake systems and periglacial landscapes are dynamic and sensitive to rapid change – in the past, present and most certainly in the future.



Item Type
Conference (Poster)
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Primary Division
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
Aquatic Sciences Meeting 2015: Global and Regional Perspectives - North meets South, 22 Feb 2015 - 27 Feb 2015, Granada, Spain.
Eprint ID
37451
Cite as
Lenz, J. , Grosse, G. , Benjamin, J. and Sebastian, W. (2015): Paleolimnological dynamics in the Alaskan Arctic: Climate drivers versus local disturbances , Aquatic Sciences Meeting 2015: Global and Regional Perspectives - North meets South, Granada, Spain, 22 February 2015 - 27 February 2015 .


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info:eu-repo/grantAgreement/EC/FP7/338335


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