Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands
The North Pacific is a zone of cyclogenesis that modulates synoptic-scale atmospheric circulation, yet there is a paucity of instrumental and paleoclimate data to fully constrain its long-term state and variability. We present the first Holocene oxygen isotope record (δ18Odiatom) from the Aleutian I...
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ftunottingham:oai:eprints.nottingham.ac.uk:52765 2023-09-05T13:11:36+02:00 Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands Bailey, Hannah L. Kaufman, Darrell S. Sloane, Hilary J. Hubbard, Alun L. Henderson, Andrew C.G. Leng, Melanie J. Meyer, Hanno Welker, Jeffrey M. 2018-08-15 http://eprints.nottingham.ac.uk/52765/ https://www.sciencedirect.com/science/article/pii/S0277379118303718?via%3Dihub https://doi.org/10.1016/j.quascirev.2018.06.027 unknown Elsevier Bailey, Hannah L. and Kaufman, Darrell S. and Sloane, Hilary J. and Hubbard, Alun L. and Henderson, Andrew C.G. and Leng, Melanie J. and Meyer, Hanno and Welker, Jeffrey M. (2018) Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands. Quaternary Science Reviews, 194 . pp. 27-38. ISSN 0277-3791 doi:10.1016/j.quascirev.2018.06.027 Article PeerReviewed 2018 ftunottingham https://doi.org/10.1016/j.quascirev.2018.06.027 2023-08-14T17:44:47Z The North Pacific is a zone of cyclogenesis that modulates synoptic-scale atmospheric circulation, yet there is a paucity of instrumental and paleoclimate data to fully constrain its long-term state and variability. We present the first Holocene oxygen isotope record (δ18Odiatom) from the Aleutian Islands, using siliceous diatoms preserved in Heart Lake on Adak Island (51.85° N, 176.69° W). This study builds on previous work demonstrating that Heart Lake sedimentary δ18Odiatom values record the δ18O signal of precipitation, and correlate significantly with atmospheric circulation indices over the past century. We apply this empirical relationship to interpret a new 9.6 ka δ18Odiatom record from the same lake, supported by diatom assemblage analysis. Our results demonstrate distinct shifts in the prevailing trajectory of storm systems that drove spatially heterogeneous patterns of moisture delivery and climate across the region. During the early-mid Holocene, a warmer/wetter climate prevailed due to a predominantly westerly Aleutian Low that enhanced advection of warm 18O-enriched Pacific moisture to Adak, and culminated in a δ18Odiatom maxima (33.3‰) at 7.6 ka during the Holocene Thermal Maximum. After 4.5 ka, relatively lower δ18Odiatom indicates cooler/drier conditions associated with enhanced northerly circulation that persisted into the 21st century. Our analysis is consistent with surface climate conditions inferred from a suite of terrestrial and marine climate-proxy records. This new Holocene dataset bridges the gap in an expanding regional network of paleoisotope studies, and provides a fresh assessment of the complex spatial patterns of Holocene climate across Beringia and the atmospheric forces driving them. Article in Journal/Newspaper aleutian low Aleutian Islands Beringia The University of Nottingham: Nottingham ePrints Adak ENVELOPE(59.561,59.561,66.502,66.502) Heart Lake ENVELOPE(166.233,166.233,-77.567,-77.567) Pacific Quaternary Science Reviews 194 27 38 |
institution |
Open Polar |
collection |
The University of Nottingham: Nottingham ePrints |
op_collection_id |
ftunottingham |
language |
unknown |
description |
The North Pacific is a zone of cyclogenesis that modulates synoptic-scale atmospheric circulation, yet there is a paucity of instrumental and paleoclimate data to fully constrain its long-term state and variability. We present the first Holocene oxygen isotope record (δ18Odiatom) from the Aleutian Islands, using siliceous diatoms preserved in Heart Lake on Adak Island (51.85° N, 176.69° W). This study builds on previous work demonstrating that Heart Lake sedimentary δ18Odiatom values record the δ18O signal of precipitation, and correlate significantly with atmospheric circulation indices over the past century. We apply this empirical relationship to interpret a new 9.6 ka δ18Odiatom record from the same lake, supported by diatom assemblage analysis. Our results demonstrate distinct shifts in the prevailing trajectory of storm systems that drove spatially heterogeneous patterns of moisture delivery and climate across the region. During the early-mid Holocene, a warmer/wetter climate prevailed due to a predominantly westerly Aleutian Low that enhanced advection of warm 18O-enriched Pacific moisture to Adak, and culminated in a δ18Odiatom maxima (33.3‰) at 7.6 ka during the Holocene Thermal Maximum. After 4.5 ka, relatively lower δ18Odiatom indicates cooler/drier conditions associated with enhanced northerly circulation that persisted into the 21st century. Our analysis is consistent with surface climate conditions inferred from a suite of terrestrial and marine climate-proxy records. This new Holocene dataset bridges the gap in an expanding regional network of paleoisotope studies, and provides a fresh assessment of the complex spatial patterns of Holocene climate across Beringia and the atmospheric forces driving them. |
format |
Article in Journal/Newspaper |
author |
Bailey, Hannah L. Kaufman, Darrell S. Sloane, Hilary J. Hubbard, Alun L. Henderson, Andrew C.G. Leng, Melanie J. Meyer, Hanno Welker, Jeffrey M. |
spellingShingle |
Bailey, Hannah L. Kaufman, Darrell S. Sloane, Hilary J. Hubbard, Alun L. Henderson, Andrew C.G. Leng, Melanie J. Meyer, Hanno Welker, Jeffrey M. Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands |
author_facet |
Bailey, Hannah L. Kaufman, Darrell S. Sloane, Hilary J. Hubbard, Alun L. Henderson, Andrew C.G. Leng, Melanie J. Meyer, Hanno Welker, Jeffrey M. |
author_sort |
Bailey, Hannah L. |
title |
Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands |
title_short |
Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands |
title_full |
Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands |
title_fullStr |
Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands |
title_full_unstemmed |
Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands |
title_sort |
holocene atmospheric circulation in the central north pacific: a new terrestrial diatom and δ18o dataset from the aleutian islands |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://eprints.nottingham.ac.uk/52765/ https://www.sciencedirect.com/science/article/pii/S0277379118303718?via%3Dihub https://doi.org/10.1016/j.quascirev.2018.06.027 |
long_lat |
ENVELOPE(59.561,59.561,66.502,66.502) ENVELOPE(166.233,166.233,-77.567,-77.567) |
geographic |
Adak Heart Lake Pacific |
geographic_facet |
Adak Heart Lake Pacific |
genre |
aleutian low Aleutian Islands Beringia |
genre_facet |
aleutian low Aleutian Islands Beringia |
op_relation |
Bailey, Hannah L. and Kaufman, Darrell S. and Sloane, Hilary J. and Hubbard, Alun L. and Henderson, Andrew C.G. and Leng, Melanie J. and Meyer, Hanno and Welker, Jeffrey M. (2018) Holocene atmospheric circulation in the central North Pacific: a new terrestrial diatom and δ18O dataset from the Aleutian Islands. Quaternary Science Reviews, 194 . pp. 27-38. ISSN 0277-3791 doi:10.1016/j.quascirev.2018.06.027 |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.06.027 |
container_title |
Quaternary Science Reviews |
container_volume |
194 |
container_start_page |
27 |
op_container_end_page |
38 |
_version_ |
1776205324631408640 |