Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis
Since the last glacial period, North America has experienced dramatic changes in regional climate, including the collapse of ice sheets and changes in precipitation. We use clumped isotope (Lambda(47)) thermometry and carbonate delta O-18 measurements of glacial and deglacial pedogenic carbonates fr...
Published in: | Paleoceanography and Paleoclimatology |
---|---|
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2023
|
Subjects: | |
Online Access: | https://doi.org/10.1029/2021PA004266 |
id |
ftncar:oai:drupal-site.org:articles_26203 |
---|---|
record_format |
openpolar |
spelling |
ftncar:oai:drupal-site.org:articles_26203 2023-05-15T16:41:23+02:00 Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis Lopez‐Maldonado, Ricardo (author) Bateman, Jesse Bloom (author) Ellis, Andre (author) Bader, Nicholas E. (author) Ramirez, Pedro (author) Arnold, Alexandrea (author) Ajoku, Osinachi (author) Lee, Hung‐I (author) Jesmok, Gregory (author) Upadhyay, Deepshikha (author) Mitsunaga, Bryce (author) Elliott, Ben (author) Tabor, Clay (author) Tripati, Aradhna (author) 2023-02-07 https://doi.org/10.1029/2021PA004266 unknown Paleoceanography and Paleoclimatology--Paleoceanog and Paleoclimatol--2572-4517--2572-4525 articles:26203 doi:10.1029/2021PA004266 ark:/85065/d79w0kfr article 2023 ftncar https://doi.org/10.1029/2021PA004266 2023-04-10T18:09:03Z Since the last glacial period, North America has experienced dramatic changes in regional climate, including the collapse of ice sheets and changes in precipitation. We use clumped isotope (Lambda(47)) thermometry and carbonate delta O-18 measurements of glacial and deglacial pedogenic carbonates from the Palouse Loess to provide constraints on hydroclimate changes in the Pacific Northwest. We also employ analysis of climate model simulations to help us further provide constraints on the hydroclimate changes in the Pacific Northwest. The coldest clumped isotope soil temperatures T( Delta(47)) (13.5 +/- 1.9(degrees)C to 17.1 1.7(degrees)C) occurred similar to 34,000-23,000 years ago. Using a soil-to-air temperature transfer function, we estimate Last Glacial Maximum (LGM) mean annual air temperatures of similar to-5.5(degrees)C and warmest average monthly temperatures (i.e., mean summer air temperatures) of similar to 4.4 degrees C. These data indicate a regional warming of 16.4 +/- 2.6(degrees)C from the LGM to the modern temperatures of 10.9(degrees)C, which was about 2.5-3 times the global average. Proxy data provide locality constraints on the boundary of the cooler anticyclone induced by LGM ice sheets, and the warmer cyclone in the Eastern Pacific Ocean. Climate model analysis suggests regional amplification of temperature anomalies is due to the proximal location of the study area to the Laurentide Ice Sheet margin and the impact of the glacial anticyclone on the region, as well as local albedo. Isotope-enabled model experiments indicate variations in water delta O-18 largely reflect atmospheric circulation changes and enhanced rainout upstream that brings more depleted vapor to the region during the LGM. 1852977 AGS-1401803 Article in Journal/Newspaper Ice Sheet OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) Pacific Paleoceanography and Paleoclimatology 38 2 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
unknown |
description |
Since the last glacial period, North America has experienced dramatic changes in regional climate, including the collapse of ice sheets and changes in precipitation. We use clumped isotope (Lambda(47)) thermometry and carbonate delta O-18 measurements of glacial and deglacial pedogenic carbonates from the Palouse Loess to provide constraints on hydroclimate changes in the Pacific Northwest. We also employ analysis of climate model simulations to help us further provide constraints on the hydroclimate changes in the Pacific Northwest. The coldest clumped isotope soil temperatures T( Delta(47)) (13.5 +/- 1.9(degrees)C to 17.1 1.7(degrees)C) occurred similar to 34,000-23,000 years ago. Using a soil-to-air temperature transfer function, we estimate Last Glacial Maximum (LGM) mean annual air temperatures of similar to-5.5(degrees)C and warmest average monthly temperatures (i.e., mean summer air temperatures) of similar to 4.4 degrees C. These data indicate a regional warming of 16.4 +/- 2.6(degrees)C from the LGM to the modern temperatures of 10.9(degrees)C, which was about 2.5-3 times the global average. Proxy data provide locality constraints on the boundary of the cooler anticyclone induced by LGM ice sheets, and the warmer cyclone in the Eastern Pacific Ocean. Climate model analysis suggests regional amplification of temperature anomalies is due to the proximal location of the study area to the Laurentide Ice Sheet margin and the impact of the glacial anticyclone on the region, as well as local albedo. Isotope-enabled model experiments indicate variations in water delta O-18 largely reflect atmospheric circulation changes and enhanced rainout upstream that brings more depleted vapor to the region during the LGM. 1852977 AGS-1401803 |
author2 |
Lopez‐Maldonado, Ricardo (author) Bateman, Jesse Bloom (author) Ellis, Andre (author) Bader, Nicholas E. (author) Ramirez, Pedro (author) Arnold, Alexandrea (author) Ajoku, Osinachi (author) Lee, Hung‐I (author) Jesmok, Gregory (author) Upadhyay, Deepshikha (author) Mitsunaga, Bryce (author) Elliott, Ben (author) Tabor, Clay (author) Tripati, Aradhna (author) |
format |
Article in Journal/Newspaper |
title |
Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis |
spellingShingle |
Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis |
title_short |
Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis |
title_full |
Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis |
title_fullStr |
Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis |
title_full_unstemmed |
Paleoclimate Changes in the Pacific Northwest Over the Past 36,000 Years From Clumped Isotope Measurements and Model Analysis |
title_sort |
paleoclimate changes in the pacific northwest over the past 36,000 years from clumped isotope measurements and model analysis |
publishDate |
2023 |
url |
https://doi.org/10.1029/2021PA004266 |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Lambda Pacific |
geographic_facet |
Lambda Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Paleoceanography and Paleoclimatology--Paleoceanog and Paleoclimatol--2572-4517--2572-4525 articles:26203 doi:10.1029/2021PA004266 ark:/85065/d79w0kfr |
op_doi |
https://doi.org/10.1029/2021PA004266 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
38 |
container_issue |
2 |
_version_ |
1766031812925063168 |