Results of n-alkane biomarker analyses and paleoclimate reconstruction
The current study presents quantitative reconstructions of tree cover, annual precipitation and mean July temperature derived from the pollen record from Lake Billyakh (65°17'N, 126°47'E, 340 m above sea level) spanning the last ca. 50 kyr. The reconstruction of tree cover suggests presenc...
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Online Access: | https://dx.doi.org/10.1594/pangaea.777016 https://doi.pangaea.de/10.1594/PANGAEA.777016 |
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ftdatacite:10.1594/pangaea.777016 2023-05-15T15:18:52+02:00 Results of n-alkane biomarker analyses and paleoclimate reconstruction Tarasov, Pavel E Müller, Stefanie Zech, Michael Andreeva, Darima Diekmann, Bernhard Leipe, Christian 2012 application/zip https://dx.doi.org/10.1594/pangaea.777016 https://doi.pangaea.de/10.1594/PANGAEA.777016 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.quaint.2012.04.007 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Multiple investigations Piston corer, UWITEC RU-Land_2005_Verkhoyansk AWI Arctic Land Expedition Collection of Datasets article Collection 2012 ftdatacite https://doi.org/10.1594/pangaea.777016 https://doi.org/10.1016/j.quaint.2012.04.007 2022-02-09T13:30:04Z The current study presents quantitative reconstructions of tree cover, annual precipitation and mean July temperature derived from the pollen record from Lake Billyakh (65°17'N, 126°47'E, 340 m above sea level) spanning the last ca. 50 kyr. The reconstruction of tree cover suggests presence of woody plants through the entire analyzed time interval, although trees played only a minor role in the vegetation around Lake Billyakh prior to 14 kyr BP (<5%). This result corroborates low percentages of tree pollen and low scores of the cold deciduous forest biome in the PG1755 record from Lake Billyakh. The reconstructed values of the mean temperature of the warmest month ~8-10 °C do not support larch forest or woodland around Lake Billyakh during the coldest phase of the last glacial between ~32 and ~15 kyr BP. However, modern cases from northern Siberia, ca. 750 km north of Lake Billyakh, demonstrate that individual larch plants can grow within shrub and grass tundra landscape in very low mean July temperatures of about 8 °C. This makes plausible our hypothesis that the western and southern foreland of the Verkhoyansk Mountains could provide enough moist and warm microhabitats and allow individual larch specimens to survive climatic extremes of the last glacial. Reconstructed mean values of precipitation are about 270 mm/yr during the last glacial interval. This value is almost 100 mm higher than modern averages reported for the extreme-continental north-eastern Siberia east of Lake Billyakh, where larch-dominated cold deciduous forest grows at present. This suggests that last glacial environments around Lake Billyakh were never too dry for larch to grow and that the summer warmth was the main factor, which limited tree growth during the last glacial interval. The n-alkane analysis of the Siberian plants presented in this study demonstrates rather complex alkane distribution patterns, which challenge the interpretation of the fossil records. In particular, extremely low n-alkane concentrations in the leaves of local coniferous trees and shrubs suggest that their contribution to the litter and therefore to the fossil lake sediments might be not high enough for tracing the Quaternary history of the needleleaved taxa using the n-alkane biomarker method. : for pollen data (table 3) see doi:10.1594/PANGAEA.729891 Article in Journal/Newspaper Arctic Tundra Siberia DataCite Metadata Store (German National Library of Science and Technology) Arctic Fossil Lake ENVELOPE(-128.902,-128.902,66.276,66.276) Verkhoyansk ENVELOPE(133.400,133.400,67.544,67.544) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Multiple investigations Piston corer, UWITEC RU-Land_2005_Verkhoyansk AWI Arctic Land Expedition |
spellingShingle |
Multiple investigations Piston corer, UWITEC RU-Land_2005_Verkhoyansk AWI Arctic Land Expedition Tarasov, Pavel E Müller, Stefanie Zech, Michael Andreeva, Darima Diekmann, Bernhard Leipe, Christian Results of n-alkane biomarker analyses and paleoclimate reconstruction |
topic_facet |
Multiple investigations Piston corer, UWITEC RU-Land_2005_Verkhoyansk AWI Arctic Land Expedition |
description |
The current study presents quantitative reconstructions of tree cover, annual precipitation and mean July temperature derived from the pollen record from Lake Billyakh (65°17'N, 126°47'E, 340 m above sea level) spanning the last ca. 50 kyr. The reconstruction of tree cover suggests presence of woody plants through the entire analyzed time interval, although trees played only a minor role in the vegetation around Lake Billyakh prior to 14 kyr BP (<5%). This result corroborates low percentages of tree pollen and low scores of the cold deciduous forest biome in the PG1755 record from Lake Billyakh. The reconstructed values of the mean temperature of the warmest month ~8-10 °C do not support larch forest or woodland around Lake Billyakh during the coldest phase of the last glacial between ~32 and ~15 kyr BP. However, modern cases from northern Siberia, ca. 750 km north of Lake Billyakh, demonstrate that individual larch plants can grow within shrub and grass tundra landscape in very low mean July temperatures of about 8 °C. This makes plausible our hypothesis that the western and southern foreland of the Verkhoyansk Mountains could provide enough moist and warm microhabitats and allow individual larch specimens to survive climatic extremes of the last glacial. Reconstructed mean values of precipitation are about 270 mm/yr during the last glacial interval. This value is almost 100 mm higher than modern averages reported for the extreme-continental north-eastern Siberia east of Lake Billyakh, where larch-dominated cold deciduous forest grows at present. This suggests that last glacial environments around Lake Billyakh were never too dry for larch to grow and that the summer warmth was the main factor, which limited tree growth during the last glacial interval. The n-alkane analysis of the Siberian plants presented in this study demonstrates rather complex alkane distribution patterns, which challenge the interpretation of the fossil records. In particular, extremely low n-alkane concentrations in the leaves of local coniferous trees and shrubs suggest that their contribution to the litter and therefore to the fossil lake sediments might be not high enough for tracing the Quaternary history of the needleleaved taxa using the n-alkane biomarker method. : for pollen data (table 3) see doi:10.1594/PANGAEA.729891 |
format |
Article in Journal/Newspaper |
author |
Tarasov, Pavel E Müller, Stefanie Zech, Michael Andreeva, Darima Diekmann, Bernhard Leipe, Christian |
author_facet |
Tarasov, Pavel E Müller, Stefanie Zech, Michael Andreeva, Darima Diekmann, Bernhard Leipe, Christian |
author_sort |
Tarasov, Pavel E |
title |
Results of n-alkane biomarker analyses and paleoclimate reconstruction |
title_short |
Results of n-alkane biomarker analyses and paleoclimate reconstruction |
title_full |
Results of n-alkane biomarker analyses and paleoclimate reconstruction |
title_fullStr |
Results of n-alkane biomarker analyses and paleoclimate reconstruction |
title_full_unstemmed |
Results of n-alkane biomarker analyses and paleoclimate reconstruction |
title_sort |
results of n-alkane biomarker analyses and paleoclimate reconstruction |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2012 |
url |
https://dx.doi.org/10.1594/pangaea.777016 https://doi.pangaea.de/10.1594/PANGAEA.777016 |
long_lat |
ENVELOPE(-128.902,-128.902,66.276,66.276) ENVELOPE(133.400,133.400,67.544,67.544) |
geographic |
Arctic Fossil Lake Verkhoyansk |
geographic_facet |
Arctic Fossil Lake Verkhoyansk |
genre |
Arctic Tundra Siberia |
genre_facet |
Arctic Tundra Siberia |
op_relation |
https://dx.doi.org/10.1016/j.quaint.2012.04.007 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.777016 https://doi.org/10.1016/j.quaint.2012.04.007 |
_version_ |
1766349030259949568 |