Synoptic-scale controls on the δ18O in precipitation across Beringia
Oxygen isotope records of precipitation (δ18Oprecip) from Beringia are thought to reflect synoptic-scale circulation changes associated with the Aleutian Low. To delineate the spatial pattern of δ18Oprecip associated with the two dominant modes of Aleutian Low circulation, we combine modern δ18Oprec...
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American Geophysical Union
2015
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Online Access: | http://nora.nerc.ac.uk/id/eprint/510853/ https://nora.nerc.ac.uk/id/eprint/510853/1/grl52997.pdf https://doi.org/10.1002/2015GL063983 |
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ftnerc:oai:nora.nerc.ac.uk:510853 2023-05-15T13:14:50+02:00 Synoptic-scale controls on the δ18O in precipitation across Beringia Bailey, Hannah L. Kaufman, Darrell S. Henderson, Andrew C.G. Leng, Melanie J. 2015 text http://nora.nerc.ac.uk/id/eprint/510853/ https://nora.nerc.ac.uk/id/eprint/510853/1/grl52997.pdf https://doi.org/10.1002/2015GL063983 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/510853/1/grl52997.pdf Bailey, Hannah L.; Kaufman, Darrell S.; Henderson, Andrew C.G.; Leng, Melanie J. orcid:0000-0003-1115-5166 . 2015 Synoptic-scale controls on the δ18O in precipitation across Beringia. Geophysical Research Letters, 42 (11). 4608-4616. https://doi.org/10.1002/2015GL063983 <https://doi.org/10.1002/2015GL063983> Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1002/2015GL063983 2023-02-04T19:41:38Z Oxygen isotope records of precipitation (δ18Oprecip) from Beringia are thought to reflect synoptic-scale circulation changes associated with the Aleutian Low. To delineate the spatial pattern of δ18Oprecip associated with the two dominant modes of Aleutian Low circulation, we combine modern δ18Oprecip and deuterium excess data with climate reanalysis and back-trajectory modelling. Aleutian Low strength and position are revealed to systematically affect regional moisture source and δ18Oprecip; whereby a strengthened Aleutian Low causes lower (higher) δ18Oprecip in western (eastern) Beringia. We compare a new 100-year-long δ18O record from the Aleutian Islands with the North Pacific Index, the primary indicator of Aleutian Low strength, and find a significant positive relationship (r = 0.43, p < 0.02, n = 28) that tracks late 20th century change. This study demonstrates synoptic-scale circulation controls on our isotope record, and provides a coherent framework for interpreting existing and emerging paleo-isotope data from the region. Article in Journal/Newspaper aleutian low Aleutian Islands Beringia Natural Environment Research Council: NERC Open Research Archive Pacific Geophysical Research Letters 42 11 4608 4616 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
Oxygen isotope records of precipitation (δ18Oprecip) from Beringia are thought to reflect synoptic-scale circulation changes associated with the Aleutian Low. To delineate the spatial pattern of δ18Oprecip associated with the two dominant modes of Aleutian Low circulation, we combine modern δ18Oprecip and deuterium excess data with climate reanalysis and back-trajectory modelling. Aleutian Low strength and position are revealed to systematically affect regional moisture source and δ18Oprecip; whereby a strengthened Aleutian Low causes lower (higher) δ18Oprecip in western (eastern) Beringia. We compare a new 100-year-long δ18O record from the Aleutian Islands with the North Pacific Index, the primary indicator of Aleutian Low strength, and find a significant positive relationship (r = 0.43, p < 0.02, n = 28) that tracks late 20th century change. This study demonstrates synoptic-scale circulation controls on our isotope record, and provides a coherent framework for interpreting existing and emerging paleo-isotope data from the region. |
format |
Article in Journal/Newspaper |
author |
Bailey, Hannah L. Kaufman, Darrell S. Henderson, Andrew C.G. Leng, Melanie J. |
spellingShingle |
Bailey, Hannah L. Kaufman, Darrell S. Henderson, Andrew C.G. Leng, Melanie J. Synoptic-scale controls on the δ18O in precipitation across Beringia |
author_facet |
Bailey, Hannah L. Kaufman, Darrell S. Henderson, Andrew C.G. Leng, Melanie J. |
author_sort |
Bailey, Hannah L. |
title |
Synoptic-scale controls on the δ18O in precipitation across Beringia |
title_short |
Synoptic-scale controls on the δ18O in precipitation across Beringia |
title_full |
Synoptic-scale controls on the δ18O in precipitation across Beringia |
title_fullStr |
Synoptic-scale controls on the δ18O in precipitation across Beringia |
title_full_unstemmed |
Synoptic-scale controls on the δ18O in precipitation across Beringia |
title_sort |
synoptic-scale controls on the δ18o in precipitation across beringia |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/510853/ https://nora.nerc.ac.uk/id/eprint/510853/1/grl52997.pdf https://doi.org/10.1002/2015GL063983 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
aleutian low Aleutian Islands Beringia |
genre_facet |
aleutian low Aleutian Islands Beringia |
op_relation |
https://nora.nerc.ac.uk/id/eprint/510853/1/grl52997.pdf Bailey, Hannah L.; Kaufman, Darrell S.; Henderson, Andrew C.G.; Leng, Melanie J. orcid:0000-0003-1115-5166 . 2015 Synoptic-scale controls on the δ18O in precipitation across Beringia. Geophysical Research Letters, 42 (11). 4608-4616. https://doi.org/10.1002/2015GL063983 <https://doi.org/10.1002/2015GL063983> |
op_doi |
https://doi.org/10.1002/2015GL063983 |
container_title |
Geophysical Research Letters |
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42 |
container_issue |
11 |
container_start_page |
4608 |
op_container_end_page |
4616 |
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1766265679878553600 |