Universität zu Köln

Fritz, Michael ORCID: 0000-0003-4591-7325, Wolter, Juliane ORCID: 0000-0001-6179-7621, Rudaya, Natalia ORCID: 0000-0003-1536-6470, Palagushkina, Olga ORCID: 0000-0002-8131-0216, Nazarova, Larisa, Obu, Jaroslav ORCID: 0000-0002-8172-2536, Rethemeyer, Janet, Lantuit, Hugues ORCID: 0000-0003-1497-6760 and Wetterich, Sebastian (2016). Holocene ice-wedge polygon development in northern Yukon permafrost peatlands (Canada). Quat. Sci. Rev., 147. S. 279 - 298. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

Ice-wedge polygon (IWP) peatlands in the Arctic and Subarctic are extremely vulnerable to climatic and environmental change. We present the results of a multidisciplinary paleoenvironmental study on IWPs in the northern Yukon, Canada. High-resolution laboratory analyses were carried out on a permafrost core and the overlying seasonally thawed (active) layer, from an IWP located in a drained lake basin on Herschel Island. In relation to 14 Accelerator Mass Spectrometry (AMS) radiocarbon dates spanning the last 5000 years, we report sedimentary data including grain size distribution and biogeochemical parameters (organic carbon, nitrogen, C/N ratio, delta C-13), stable water isotopes (delta O-18, delta D), as well as fossil pollen, plant macrofossil and diatom assemblages. Three sediment units (SUS) correspond to the main stages of deposition (1) in a thermokarst lake (SW : 4950 to 3950 cal yrs BP), (2) during transition from lacustrine to palustrine conditions after lake drainage (SU2: 3950 to 3120 cal yrs BP), and (3) in palustrine conditions of the IWP field that developed after drainage (SU3: 3120 cal yrs BP to 2012 CE). The lacustrine phase (pre 3950 cal yrs BP) is characterized by planktonic-benthic and pioneer diatom species indicating circumneutral waters, and very few plant macrofossils. The pollen record has captured a regional signal of relatively stable vegetation composition and climate for the lacustrine stage of the record until 3950 cal yrs BP. Palustrine conditions with benthic and acidophilic diatom species characterize the peaty shallow-water environments of the low-centered IWP. The transition from lacustrine to palustrine conditions was accompanied by acidification and rapid revegetation of the lake bottom within about 100 years. Since the palustrine phase we consider the pollen record as a local vegetation proxy dominated by the plant communities growing in the IWP. Ice-wedge cracking in water-saturated sediments started immediately after lake drainage at about 3950 cal yrs BP and led to the formation of an IWP mire. Permafrost aggradation through downward closed-system freezing of the lake talik is indicated by the stable water isotope record. The originally submerged IWP center underwent gradual drying during the past 2000 years. This study highlights the sensitivity of permafrost landscapes to climate and environmental change throughout the Holocene. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fritz, Michael UNSPECIFIED orcid.org/0000-0003-4591-7325 UNSPECIFIED Wolter, Juliane UNSPECIFIED orcid.org/0000-0001-6179-7621 UNSPECIFIED Rudaya, Natalia UNSPECIFIED orcid.org/0000-0003-1536-6470 UNSPECIFIED Palagushkina, Olga UNSPECIFIED orcid.org/0000-0002-8131-0216 UNSPECIFIED Nazarova, Larisa UNSPECIFIED UNSPECIFIED UNSPECIFIED Obu, Jaroslav UNSPECIFIED orcid.org/0000-0002-8172-2536 UNSPECIFIED Rethemeyer, Janet UNSPECIFIED UNSPECIFIED UNSPECIFIED Lantuit, Hugues UNSPECIFIED orcid.org/0000-0003-1497-6760 UNSPECIFIED Wetterich, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-265103
DOI:	10.1016/j.quascirev.2016.02.008
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	147
Page Range:	S. 279 - 298
Date:	2016
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WESTERN ARCTIC COAST; NON-POLLEN PALYNOMORPHS; DRAINED LAKE SITE; CLIMATE-CHANGE; TUKTOYAKTUK COASTLANDS; NORTHWEST-TERRITORIES; VEGETATION PATTERNS; LANDSCAPE DYNAMICS; EASTERN BERINGIA; HERSCHEL ISLAND Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26510