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Article: Last century warming over the Canadian Atlantic shelves linked to weak Atlantic Meridional Overturning Circulation

TitleLast century warming over the Canadian Atlantic shelves linked to weak Atlantic Meridional Overturning Circulation
Authors
KeywordsAtlantic meridional overturning circulation
Climate change
Global change
Ocean model
Oceanography
Issue Date2018
PublisherAmerican Geophysical Union. The Journal's web site is located at https://agupubs.onlinelibrary.wiley.com/journal/19448007
Citation
Geophysical Research Letters, 2018, v. 45 n. 22, p. 12376-12385 How to Cite?
AbstractThe Atlantic meridional overturning circulation (AMOC) is a key component of the global climate system. Recent studies suggested a twentieth-century weakening of the AMOC of unprecedented amplitude (~15%) over the last millennium. Here we present a record of δ18O in benthic foraminifera from sediment cores retrieved from the Laurentian Channel and demonstrate that the δ18O trend is linked to the strength of the AMOC. In this 100-year record, the AMOC signal decreased steadily to reach its minimum value in the late 1970s, where the weakest AMOC signal then remains constant until 2000. We also present a longer δ18O record of 1,500 years and highlight the uniqueness of the last century δ18O trend. Moreover, the Little Ice Age period is characterized by statistically heavier δ18O, suggesting a relatively weak AMOC. Implications for understanding the mechanisms driving the intensity of AMOC under global warming and high-latitude freshwater input are discussed.
Persistent Identifierhttp://hdl.handle.net/10722/265068
ISSN
2023 Impact Factor: 4.6
2023 SCImago Journal Rankings: 1.850
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorThibodeau, B-
dc.contributor.authorNot, CA-
dc.contributor.authorZhu, J-
dc.contributor.authorSchmittner, A-
dc.contributor.authorNoone, D-
dc.contributor.authorTabor, C-
dc.contributor.authorZhang, J-
dc.contributor.authorLiu, Z-
dc.date.accessioned2018-11-20T01:59:33Z-
dc.date.available2018-11-20T01:59:33Z-
dc.date.issued2018-
dc.identifier.citationGeophysical Research Letters, 2018, v. 45 n. 22, p. 12376-12385-
dc.identifier.issn0094-8276-
dc.identifier.urihttp://hdl.handle.net/10722/265068-
dc.description.abstractThe Atlantic meridional overturning circulation (AMOC) is a key component of the global climate system. Recent studies suggested a twentieth-century weakening of the AMOC of unprecedented amplitude (~15%) over the last millennium. Here we present a record of δ18O in benthic foraminifera from sediment cores retrieved from the Laurentian Channel and demonstrate that the δ18O trend is linked to the strength of the AMOC. In this 100-year record, the AMOC signal decreased steadily to reach its minimum value in the late 1970s, where the weakest AMOC signal then remains constant until 2000. We also present a longer δ18O record of 1,500 years and highlight the uniqueness of the last century δ18O trend. Moreover, the Little Ice Age period is characterized by statistically heavier δ18O, suggesting a relatively weak AMOC. Implications for understanding the mechanisms driving the intensity of AMOC under global warming and high-latitude freshwater input are discussed.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at https://agupubs.onlinelibrary.wiley.com/journal/19448007-
dc.relation.ispartofGeophysical Research Letters-
dc.rightsGeophysical Research Letters. Copyright © American Geophysical Union.-
dc.rightsPublished version Copyright [2018] American Geophysical Union. To view the published open abstract, go to https://doi.org/10.1029/2018GL080083-
dc.subjectAtlantic meridional overturning circulation-
dc.subjectClimate change-
dc.subjectGlobal change-
dc.subjectOcean model-
dc.subjectOceanography-
dc.titleLast century warming over the Canadian Atlantic shelves linked to weak Atlantic Meridional Overturning Circulation-
dc.typeArticle-
dc.identifier.emailThibodeau, B: bthib@hku.hk-
dc.identifier.emailNot, CA: cnot@hku.hk-
dc.identifier.authorityThibodeau, B=rp02033-
dc.identifier.authorityNot, CA=rp02029-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1029/2018GL080083-
dc.identifier.scopuseid_2-s2.0-85057023908-
dc.identifier.hkuros296138-
dc.identifier.volume45-
dc.identifier.issue22-
dc.identifier.spage12376-
dc.identifier.epage12385-
dc.identifier.isiWOS:000453250000031-
dc.publisher.placeUnited States-
dc.identifier.issnl0094-8276-

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