Universität zu Köln

Meyer, Hanno ORCID: 0000-0003-4129-4706, Schirrmeister, Lutz ORCID: 0000-0001-9455-0596, Andreev, Andrei ORCID: 0000-0002-8745-9636, Wagner, Dirk ORCID: 0000-0001-5064-497X, Hubberten, Hans-W., Yoshikawa, Kenji ORCID: 0000-0001-5935-2041, Bobrov, Anatoly, Wetterich, Sebastian, Opel, Thomas ORCID: 0000-0003-1315-8256, Kandiano, Evgeniya and Brown, Jerry (2010). Lateglacial and Holocene isotopic and environmental history of northern coastal Alaska - Results from a buried ice-wedge system at Barrow. Quat. Sci. Rev., 29 (27-28). S. 3720 - 3736. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

Barrow, the northernmost point in Alaska, is one of the most intensively studied areas in the Arctic. However, paleoenvironmental evidence is limited for northern Alaska for the Lateglacial-Holocene transition. For a regional paleoenvironmental reconstruction, we investigated a permafrost ice-wedge tunnel near Barrow, Alaska. The studied site was first excavated in the early 1960s and intercepts a buried ice-wedge system at 3-6 m depth below the surface. A multi-methodological approach was applied to this buried ice-wedge system and the enclosing sediments, which in their combination, give new insight into the Late Quaternary environmental and climate history. Results of geochronological, sedimentological, cryolithological, paleoecological, isotope geochemical and microbiological studies reflect different stages of mid to late Wisconsin (MW to LW), Allerod (AD), Younger Dryas (YD), Preboreal (PB), and Late Holocene paleoenvironmental evolution. The LW age of the site is indicated by AMS dates in the surrounding sediments of 21.7 kyr BP at the lateral contact of the ice-wedge system as well as 39.5 kyr BP below the ice-wedge system. It is only recently that in this region, stable isotope techniques have been employed, i.e. to characterize different types of ground ice. The stable isotope record (oxygen: delta O-18; hydrogen: delta D) of two intersecting ice wedges suggests different phases of the northern Alaskan climate history from AD to PB, with radiocarbon dates from 12.4 to 9.9 kyr BP (ranging from 14.8 to 10.6 kyr cal BP). Stable isotope geochemistry of ice wedges reveals winter temperature variations of the Lateglacial Holocene transition including a prominent YD cold period, clearly separated from the warmer AD and PB phases. YD is only weakly developed in summer temperature indicators (such as pollen) for the northern Alaska area, and by consequence, the YD cold stadial was here especially related to the winter season. This highlights that the combination of winter and summer indicators comprehensively describes the seasonality of climate-relevant processes in discrete time intervals. The stable isotope record for the Barrow buried ice-wedge system documents for the first time winter climate change at the Lateglacial Holocene transition continuously and at relatively high (likely centennial) resolution. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Meyer, Hanno UNSPECIFIED orcid.org/0000-0003-4129-4706 UNSPECIFIED Schirrmeister, Lutz UNSPECIFIED orcid.org/0000-0001-9455-0596 UNSPECIFIED Andreev, Andrei UNSPECIFIED orcid.org/0000-0002-8745-9636 UNSPECIFIED Wagner, Dirk UNSPECIFIED orcid.org/0000-0001-5064-497X UNSPECIFIED Hubberten, Hans-W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yoshikawa, Kenji UNSPECIFIED orcid.org/0000-0001-5935-2041 UNSPECIFIED Bobrov, Anatoly UNSPECIFIED UNSPECIFIED UNSPECIFIED Wetterich, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Opel, Thomas UNSPECIFIED orcid.org/0000-0003-1315-8256 UNSPECIFIED Kandiano, Evgeniya UNSPECIFIED UNSPECIFIED UNSPECIFIED Brown, Jerry UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-492043
DOI:	10.1016/j.quascirev.2010.08.005
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	29
Number:	27-28
Page Range:	S. 3720 - 3736
Date:	2010
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 QUATERNARY POLLEN RECORDS; THAW LAKE BASINS; YOUNGER DRYAS; VEGETATION HISTORY; SPATIAL-ANALYSIS; STABLE-ISOTOPES; HYDROGEN; OXYGEN; PALEOCLIMATE; LANDSCAPE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/49204