The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections
The ice core recovered from Prospector Russell Col on Mt Logan (5.4 km a.s.l.), in the Yukon spans over 20 000 years. This unique record offers a Pacific view of the stable isotope and chemical record from the Lateglacial to the present. The timescale is based on seasonal counted years, the largest...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1530 2023-05-15T16:39:19+02:00 The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections Fisher, David Osterberg, Erich Dyke, Art Dahl-Jensen, Dorthe Demuth, Mike Zdanowicz, Christian Bourgeois, Jocelyne Koerner, Roy M Mayewski, Paul A Wake, Cameron P Kreutz, K Steig, Eric J Zheng, James Yalcin, Kaplan Goto-Azuma, Kumiko Luckman, Brian Rupper, Summer 2008-08-01T07:00:00Z https://scholars.unh.edu/earthsci_facpub/531 http://hol.sagepub.com/content/18/5/667.abstract unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/531 http://hol.sagepub.com/content/18/5/667.abstract Earth Sciences Scholarship Mt Logan stable isotopes Holocene ENSO peat N Pacific sudden change text 2008 ftuninhampshire 2023-01-30T21:35:33Z The ice core recovered from Prospector Russell Col on Mt Logan (5.4 km a.s.l.), in the Yukon spans over 20 000 years. This unique record offers a Pacific view of the stable isotope and chemical record from the Lateglacial to the present. The timescale is based on seasonal counted years, the largest known volcanic acid signatures and the major shift in stable isotopes and chemistry at the end of the Younger Dryas. There are large and sustained changes in the stable isotopic record that are anti-correlated with marine and continental chemistry series. The oxygen-18 in this area is not a proxy for palaeotemperature but rather for source region. The last major isotope shift in AD 1840 in δ(18O) and chemistry is compared with the Quinn's ENSO record. During periods of more frequent La Niña (stronger tropical easterlies) there is more zonal flow of water vapour transport to the Pacific Northwest, δ(18O) values are larger and the deuterium excess d smaller. These periods coincide with periods of lower accumulation/precipitation in southern Yukon. The Holocene δ(18O) record indicates many large shifts between the meridional (strong El Niño) and zonal (La Niña). Comparison of the Logan isotopic record and the moisture/temperature-sensitive time series of peat bog inception dates for the Northwest shows a strong correlation (0.36) that points to high accumulation rates coincident with low δ(18O) and enhanced meridional flow. Major changes in the core at 4200 BP and 7000—8000 BP point to enhanced meridional flow, which coincide with big changes in the Pacific palaeorecords of the balance between El Niño and La Niña. 4200 BP seems to have inaugurated the `modern' ENSO world. Text ice core Yukon University of New Hampshire: Scholars Repository Yukon Pacific Russell Col ENVELOPE(-140.904,-140.904,60.316,60.316) |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Mt Logan stable isotopes Holocene ENSO peat N Pacific sudden change |
spellingShingle |
Mt Logan stable isotopes Holocene ENSO peat N Pacific sudden change Fisher, David Osterberg, Erich Dyke, Art Dahl-Jensen, Dorthe Demuth, Mike Zdanowicz, Christian Bourgeois, Jocelyne Koerner, Roy M Mayewski, Paul A Wake, Cameron P Kreutz, K Steig, Eric J Zheng, James Yalcin, Kaplan Goto-Azuma, Kumiko Luckman, Brian Rupper, Summer The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections |
topic_facet |
Mt Logan stable isotopes Holocene ENSO peat N Pacific sudden change |
description |
The ice core recovered from Prospector Russell Col on Mt Logan (5.4 km a.s.l.), in the Yukon spans over 20 000 years. This unique record offers a Pacific view of the stable isotope and chemical record from the Lateglacial to the present. The timescale is based on seasonal counted years, the largest known volcanic acid signatures and the major shift in stable isotopes and chemistry at the end of the Younger Dryas. There are large and sustained changes in the stable isotopic record that are anti-correlated with marine and continental chemistry series. The oxygen-18 in this area is not a proxy for palaeotemperature but rather for source region. The last major isotope shift in AD 1840 in δ(18O) and chemistry is compared with the Quinn's ENSO record. During periods of more frequent La Niña (stronger tropical easterlies) there is more zonal flow of water vapour transport to the Pacific Northwest, δ(18O) values are larger and the deuterium excess d smaller. These periods coincide with periods of lower accumulation/precipitation in southern Yukon. The Holocene δ(18O) record indicates many large shifts between the meridional (strong El Niño) and zonal (La Niña). Comparison of the Logan isotopic record and the moisture/temperature-sensitive time series of peat bog inception dates for the Northwest shows a strong correlation (0.36) that points to high accumulation rates coincident with low δ(18O) and enhanced meridional flow. Major changes in the core at 4200 BP and 7000—8000 BP point to enhanced meridional flow, which coincide with big changes in the Pacific palaeorecords of the balance between El Niño and La Niña. 4200 BP seems to have inaugurated the `modern' ENSO world. |
format |
Text |
author |
Fisher, David Osterberg, Erich Dyke, Art Dahl-Jensen, Dorthe Demuth, Mike Zdanowicz, Christian Bourgeois, Jocelyne Koerner, Roy M Mayewski, Paul A Wake, Cameron P Kreutz, K Steig, Eric J Zheng, James Yalcin, Kaplan Goto-Azuma, Kumiko Luckman, Brian Rupper, Summer |
author_facet |
Fisher, David Osterberg, Erich Dyke, Art Dahl-Jensen, Dorthe Demuth, Mike Zdanowicz, Christian Bourgeois, Jocelyne Koerner, Roy M Mayewski, Paul A Wake, Cameron P Kreutz, K Steig, Eric J Zheng, James Yalcin, Kaplan Goto-Azuma, Kumiko Luckman, Brian Rupper, Summer |
author_sort |
Fisher, David |
title |
The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections |
title_short |
The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections |
title_full |
The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections |
title_fullStr |
The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections |
title_full_unstemmed |
The Mt Logan Holocene-late Wisconsinan isotope record: tropical Pacific—Yukon connections |
title_sort |
mt logan holocene-late wisconsinan isotope record: tropical pacific—yukon connections |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2008 |
url |
https://scholars.unh.edu/earthsci_facpub/531 http://hol.sagepub.com/content/18/5/667.abstract |
long_lat |
ENVELOPE(-140.904,-140.904,60.316,60.316) |
geographic |
Yukon Pacific Russell Col |
geographic_facet |
Yukon Pacific Russell Col |
genre |
ice core Yukon |
genre_facet |
ice core Yukon |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/531 http://hol.sagepub.com/content/18/5/667.abstract |
_version_ |
1766029656437293056 |