Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications
The Espenberg maar lakes on the Seward Peninsula, Alaska, are the largest volcanic crater lakes in the world and contain the longest known lacustrine sedimentary archives in Alaska. The lack of glacialaged marine sedimentary archives around the Bering Land Bridge due to exposure of the shelf during...
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ftchinacascieeca:oai:ir.ieecas.cn:361006/13035 2023-06-11T04:10:38+02:00 Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications Wang, Karen J. O'Donnell, Jonathan A. Longo, William M. Amaral-Zettler, Linda Li, Gaoyuan Yao, Yuan Huang, Yongsong 2019-12-01 http://ir.ieecas.cn/handle/361006/13035 https://doi.org/10.1016/j.orggeochem.2019.103924 英语 eng PERGAMON-ELSEVIER SCIENCE LTD ORGANIC GEOCHEMISTRY http://ir.ieecas.cn/handle/361006/13035 doi:10.1016/j.orggeochem.2019.103924 Alkenones Isochrysidales Espenberg maar lakes Seward Peninsula Alaska AgTCM 18S rRNA Paleotemperature LONG-CHAIN-ALKENONES PERMAFROST CARBON CLIMATE-CHANGE TEMPERATURE SEDIMENTS DISTRIBUTIONS SENSITIVITY HAPTOPHYTE SEPARATION RESOLUTION Geochemistry & Geophysics 期刊论文 2019 ftchinacascieeca https://doi.org/10.1016/j.orggeochem.2019.103924 2023-05-08T13:24:18Z The Espenberg maar lakes on the Seward Peninsula, Alaska, are the largest volcanic crater lakes in the world and contain the longest known lacustrine sedimentary archives in Alaska. The lack of glacialaged marine sedimentary archives around the Bering Land Bridge due to exposure of the shelf during sea level low-stands makes these lakes highly valuable for understanding the region's past climate and environmental changes. Located en route to humanity's last colonized American continents, the Seward Peninsula's climate and environments during the last glacial period bear major anthropological significance. However, a lack of quantitative proxies has so far hampered exploration of these lakes for paleoclimate reconstructions. Here we report, for the first time, the discovery of abundant Group I alkenones and Isochrysidales in surface sediments from three maar lakes: White Fish, North Killeak and Devil Mountain, using a combination of lipid biomarker and 18S rRNA gene sequencing analyses. Our discovery adds to the expanding list of oligotrophic freshwater lakes where Group I alkenones are found, and water chemistry data contribute to the understanding of the environmental controls on Group I Isochrysidales. Our results further confirm the use of the U-37(K) index of Group I alkenones as a proxy for the mean temperature of the spring isotherm (MTSI) and RIK37 as a quantitative measurement for Isochrysidales group mixing. We also demonstrate the analytical challenges for analyzing alkenones in freshwater lakes and the effectiveness of eliminating coelution using silver thiolate chromatographic material (AgTCM). (C) 2019 Elsevier Ltd. All rights reserved. Report Bering Land Bridge permafrost Seward Peninsula Alaska Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Organic Geochemistry 138 103924 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Alkenones Isochrysidales Espenberg maar lakes Seward Peninsula Alaska AgTCM 18S rRNA Paleotemperature LONG-CHAIN-ALKENONES PERMAFROST CARBON CLIMATE-CHANGE TEMPERATURE SEDIMENTS DISTRIBUTIONS SENSITIVITY HAPTOPHYTE SEPARATION RESOLUTION Geochemistry & Geophysics |
spellingShingle |
Alkenones Isochrysidales Espenberg maar lakes Seward Peninsula Alaska AgTCM 18S rRNA Paleotemperature LONG-CHAIN-ALKENONES PERMAFROST CARBON CLIMATE-CHANGE TEMPERATURE SEDIMENTS DISTRIBUTIONS SENSITIVITY HAPTOPHYTE SEPARATION RESOLUTION Geochemistry & Geophysics Wang, Karen J. O'Donnell, Jonathan A. Longo, William M. Amaral-Zettler, Linda Li, Gaoyuan Yao, Yuan Huang, Yongsong Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
topic_facet |
Alkenones Isochrysidales Espenberg maar lakes Seward Peninsula Alaska AgTCM 18S rRNA Paleotemperature LONG-CHAIN-ALKENONES PERMAFROST CARBON CLIMATE-CHANGE TEMPERATURE SEDIMENTS DISTRIBUTIONS SENSITIVITY HAPTOPHYTE SEPARATION RESOLUTION Geochemistry & Geophysics |
description |
The Espenberg maar lakes on the Seward Peninsula, Alaska, are the largest volcanic crater lakes in the world and contain the longest known lacustrine sedimentary archives in Alaska. The lack of glacialaged marine sedimentary archives around the Bering Land Bridge due to exposure of the shelf during sea level low-stands makes these lakes highly valuable for understanding the region's past climate and environmental changes. Located en route to humanity's last colonized American continents, the Seward Peninsula's climate and environments during the last glacial period bear major anthropological significance. However, a lack of quantitative proxies has so far hampered exploration of these lakes for paleoclimate reconstructions. Here we report, for the first time, the discovery of abundant Group I alkenones and Isochrysidales in surface sediments from three maar lakes: White Fish, North Killeak and Devil Mountain, using a combination of lipid biomarker and 18S rRNA gene sequencing analyses. Our discovery adds to the expanding list of oligotrophic freshwater lakes where Group I alkenones are found, and water chemistry data contribute to the understanding of the environmental controls on Group I Isochrysidales. Our results further confirm the use of the U-37(K) index of Group I alkenones as a proxy for the mean temperature of the spring isotherm (MTSI) and RIK37 as a quantitative measurement for Isochrysidales group mixing. We also demonstrate the analytical challenges for analyzing alkenones in freshwater lakes and the effectiveness of eliminating coelution using silver thiolate chromatographic material (AgTCM). (C) 2019 Elsevier Ltd. All rights reserved. |
format |
Report |
author |
Wang, Karen J. O'Donnell, Jonathan A. Longo, William M. Amaral-Zettler, Linda Li, Gaoyuan Yao, Yuan Huang, Yongsong |
author_facet |
Wang, Karen J. O'Donnell, Jonathan A. Longo, William M. Amaral-Zettler, Linda Li, Gaoyuan Yao, Yuan Huang, Yongsong |
author_sort |
Wang, Karen J. |
title |
Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
title_short |
Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
title_full |
Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
title_fullStr |
Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
title_full_unstemmed |
Group I alkenones and Isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
title_sort |
group i alkenones and isochrysidales in the world's largest maar lakes and their potential paleoclimate applications |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2019 |
url |
http://ir.ieecas.cn/handle/361006/13035 https://doi.org/10.1016/j.orggeochem.2019.103924 |
genre |
Bering Land Bridge permafrost Seward Peninsula Alaska |
genre_facet |
Bering Land Bridge permafrost Seward Peninsula Alaska |
op_relation |
ORGANIC GEOCHEMISTRY http://ir.ieecas.cn/handle/361006/13035 doi:10.1016/j.orggeochem.2019.103924 |
op_doi |
https://doi.org/10.1016/j.orggeochem.2019.103924 |
container_title |
Organic Geochemistry |
container_volume |
138 |
container_start_page |
103924 |
_version_ |
1768385166309326848 |