Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA
Abstract Large-scale atmospheric circulation patterns determine the quantity and seasonality of precipitation, the major source of water in most terrestrial ecosystems. Oxygen isotope (δ 18 O) dynamics of the present-day hydrologic system in the Palouse region of the northwestern U.S.A. indicate a s...
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Cambridge University Press (CUP)
2009
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crcambridgeupr:10.1016/j.yqres.2009.06.001 2024-06-09T07:46:49+00:00 Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA Takeuchi, Akinori Goodwin, Angela J. Moravec, Bryan G. Larson, Peter B. Keller, C. Kent 2009 http://dx.doi.org/10.1016/j.yqres.2009.06.001 http://api.elsevier.com/content/article/PII:S0033589409000696?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589409000696?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940000644X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 72, issue 2, page 198-206 ISSN 0033-5894 1096-0287 journal-article 2009 crcambridgeupr https://doi.org/10.1016/j.yqres.2009.06.001 2024-05-15T13:10:22Z Abstract Large-scale atmospheric circulation patterns determine the quantity and seasonality of precipitation, the major source of water in most terrestrial ecosystems. Oxygen isotope (δ 18 O) dynamics of the present-day hydrologic system in the Palouse region of the northwestern U.S.A. indicate a seasonal correlation between the δ 18 O values of precipitation and temperature, but no seasonal trends of δ 18 O records in soil water and shallow groundwater. Their isotope values are close to those of winter precipitation because the Palouse receives ∼ 75% of its precipitation during winter. Palouse Loess deposits contain late Pleistocene pedogenic carbonate having ca. 2 to 3‰ higher δ 18 O values and up to 5‰ higher carbon isotope (δ 13 C) values than Holocene and modern carbonates. The late Pleistocene δ 18 O values are best explained by a decrease in isotopically light winter precipitation relative to the modern winter-dominated infiltration. The δ 13 C values are attributed to a proportional increase of atmospheric CO 2 in soil CO 2 due to a decrease in soil respiration rate and 13 C discrimination in plants under much drier paleoclimate conditions than today. The regional climate difference was likely related to anticyclonic circulation over the Pleistocene Laurentide and Ice Sheet. Article in Journal/Newspaper Ice Sheet Cambridge University Press Pacific Quaternary Research 72 2 198 206 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract Large-scale atmospheric circulation patterns determine the quantity and seasonality of precipitation, the major source of water in most terrestrial ecosystems. Oxygen isotope (δ 18 O) dynamics of the present-day hydrologic system in the Palouse region of the northwestern U.S.A. indicate a seasonal correlation between the δ 18 O values of precipitation and temperature, but no seasonal trends of δ 18 O records in soil water and shallow groundwater. Their isotope values are close to those of winter precipitation because the Palouse receives ∼ 75% of its precipitation during winter. Palouse Loess deposits contain late Pleistocene pedogenic carbonate having ca. 2 to 3‰ higher δ 18 O values and up to 5‰ higher carbon isotope (δ 13 C) values than Holocene and modern carbonates. The late Pleistocene δ 18 O values are best explained by a decrease in isotopically light winter precipitation relative to the modern winter-dominated infiltration. The δ 13 C values are attributed to a proportional increase of atmospheric CO 2 in soil CO 2 due to a decrease in soil respiration rate and 13 C discrimination in plants under much drier paleoclimate conditions than today. The regional climate difference was likely related to anticyclonic circulation over the Pleistocene Laurentide and Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
Takeuchi, Akinori Goodwin, Angela J. Moravec, Bryan G. Larson, Peter B. Keller, C. Kent |
spellingShingle |
Takeuchi, Akinori Goodwin, Angela J. Moravec, Bryan G. Larson, Peter B. Keller, C. Kent Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA |
author_facet |
Takeuchi, Akinori Goodwin, Angela J. Moravec, Bryan G. Larson, Peter B. Keller, C. Kent |
author_sort |
Takeuchi, Akinori |
title |
Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA |
title_short |
Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA |
title_full |
Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA |
title_fullStr |
Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA |
title_full_unstemmed |
Isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland Pacific Northwest of the USA |
title_sort |
isotopic evidence for temporal variation in proportion of seasonal precipitation since the last glacial time in the inland pacific northwest of the usa |
publisher |
Cambridge University Press (CUP) |
publishDate |
2009 |
url |
http://dx.doi.org/10.1016/j.yqres.2009.06.001 http://api.elsevier.com/content/article/PII:S0033589409000696?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S0033589409000696?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940000644X |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Quaternary Research volume 72, issue 2, page 198-206 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/j.yqres.2009.06.001 |
container_title |
Quaternary Research |
container_volume |
72 |
container_issue |
2 |
container_start_page |
198 |
op_container_end_page |
206 |
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1801376815440199680 |