Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin
Paleontological, geochemical, and geophysical data from pluvial Summer Lake, Oregon, western Great Basin are the basis for a high resolution paleoclimate record during a time interval (38-34 ka) including the Mono Lake Excursion, Dansgaard-Oeschger interstadials #8-6, and the end of Heinrich Event 4...
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California State University, Bakersfield
2016
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Online Access: | https://hdl.handle.net/20.500.12680/p5547t98n |
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ftcalifstateuniv:oai:scholarworks:p5547t98n 2024-09-30T14:36:32+00:00 Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin Heaton, Eric James Negrini, Robert Wigand, Peter Guo, Junhua 2016 https://hdl.handle.net/20.500.12680/p5547t98n English eng California State University, Bakersfield Natural Sciences, Mathematics, and Engineering Geological Sciences http://hdl.handle.net/20.500.12680/p5547t98n http://rightsstatements.org/vocab/InC/1.0/?creator Lakes Paleoclimatology Masters Thesis 2016 ftcalifstateuniv https://doi.org/20.500.12680/p5547t98n 2024-09-10T17:06:17Z Paleontological, geochemical, and geophysical data from pluvial Summer Lake, Oregon, western Great Basin are the basis for a high resolution paleoclimate record during a time interval (38-34 ka) including the Mono Lake Excursion, Dansgaard-Oeschger interstadials #8-6, and the end of Heinrich Event 4. The proxies consist of grain-size, Corg/N ratio, ostracode faunal counts, and palynology and build on previously-published proxies based on environmental magnetism. Results from granulometry and geochemical analysis and the presence of the ostracode Cytherissa lacustris consistently demonstrate the correspondence of low lake conditions and colder water temperatures during Dansgaard-Oeschger stadials, one of which also includes the Mono Lake Excursion found both in the lake and ice core records. Palynological variability seen from Atriplex, Rosaceae, high spine and low spine Asteraceae concentrations, and pollen ratios of Juniperus/Dip Pinus and (Rosaceae+Atriplex+Poaceae+Hi Spine+Low Spine Asteraceae)/(Pinus+Picea+Tsuga mertensiana+Sarcobatus) suggest warmer/wetter semi-arid woodland conditions during interstadials 8 and 7 and colder/drier continental montane woodland conditions during stadial periods. These results confirm those of earlier studies at Summer Lake and other Great Basin lakes in western North America with respect to the relationship between millennial-scale temperature changes throughout the northern hemisphere and the response of regional climate in western North America at semitropical latitudes. That is, millennial-scale interstadials are associated with warmer, wetter climates in the Great Basin and vice-versa. Master Thesis ice core Scholarworks from California State University Low Lake ENVELOPE(142.677,142.677,-66.993,-66.993) |
institution |
Open Polar |
collection |
Scholarworks from California State University |
op_collection_id |
ftcalifstateuniv |
language |
English |
topic |
Lakes Paleoclimatology |
spellingShingle |
Lakes Paleoclimatology Heaton, Eric James Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin |
topic_facet |
Lakes Paleoclimatology |
description |
Paleontological, geochemical, and geophysical data from pluvial Summer Lake, Oregon, western Great Basin are the basis for a high resolution paleoclimate record during a time interval (38-34 ka) including the Mono Lake Excursion, Dansgaard-Oeschger interstadials #8-6, and the end of Heinrich Event 4. The proxies consist of grain-size, Corg/N ratio, ostracode faunal counts, and palynology and build on previously-published proxies based on environmental magnetism. Results from granulometry and geochemical analysis and the presence of the ostracode Cytherissa lacustris consistently demonstrate the correspondence of low lake conditions and colder water temperatures during Dansgaard-Oeschger stadials, one of which also includes the Mono Lake Excursion found both in the lake and ice core records. Palynological variability seen from Atriplex, Rosaceae, high spine and low spine Asteraceae concentrations, and pollen ratios of Juniperus/Dip Pinus and (Rosaceae+Atriplex+Poaceae+Hi Spine+Low Spine Asteraceae)/(Pinus+Picea+Tsuga mertensiana+Sarcobatus) suggest warmer/wetter semi-arid woodland conditions during interstadials 8 and 7 and colder/drier continental montane woodland conditions during stadial periods. These results confirm those of earlier studies at Summer Lake and other Great Basin lakes in western North America with respect to the relationship between millennial-scale temperature changes throughout the northern hemisphere and the response of regional climate in western North America at semitropical latitudes. That is, millennial-scale interstadials are associated with warmer, wetter climates in the Great Basin and vice-versa. |
author2 |
Negrini, Robert Wigand, Peter Guo, Junhua |
format |
Master Thesis |
author |
Heaton, Eric James |
author_facet |
Heaton, Eric James |
author_sort |
Heaton, Eric James |
title |
Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin |
title_short |
Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin |
title_full |
Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin |
title_fullStr |
Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin |
title_full_unstemmed |
Paleontological, geochemical, and geophysical climate proxies in Late Pleistocene lacustrine sediments from Summer Lake, Oregon, western Great Basin |
title_sort |
paleontological, geochemical, and geophysical climate proxies in late pleistocene lacustrine sediments from summer lake, oregon, western great basin |
publisher |
California State University, Bakersfield |
publishDate |
2016 |
url |
https://hdl.handle.net/20.500.12680/p5547t98n |
long_lat |
ENVELOPE(142.677,142.677,-66.993,-66.993) |
geographic |
Low Lake |
geographic_facet |
Low Lake |
genre |
ice core |
genre_facet |
ice core |
op_relation |
http://hdl.handle.net/20.500.12680/p5547t98n |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/?creator |
op_doi |
https://doi.org/20.500.12680/p5547t98n |
_version_ |
1811639573035352064 |