Anomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 years

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dc.contributor.authorTurney, Chris S.M.en_NZ
dc.contributor.authorJones, Richard T.en_NZ
dc.contributor.authorLister, Daviden_NZ
dc.contributor.authorJones, Philen_NZ
dc.contributor.authorWilliams, Alan N.en_NZ
dc.contributor.authorHogg, Alan G.en_NZ
dc.contributor.authorThomas, Zoë A.en_NZ
dc.contributor.authorCompo, Gibert P.en_NZ
dc.contributor.authorYin, Xungangen_NZ
dc.contributor.authorFogwill, Christopher J.en_NZ
dc.contributor.authorPalmer, Jonathanen_NZ
dc.contributor.authorColwell, Steveen_NZ
dc.contributor.authorAllan, Roben_NZ
dc.contributor.authorVisbeck, Martinen_NZ
dc.date.accessioned2016-06-27T02:41:43Z
dc.date.available2016en_NZ
dc.date.available2016-06-27T02:41:43Z
dc.date.issued2016en_NZ
dc.description.abstractDetermining the timing and impact of anthropogenic climate change in data-sparse regions is a considerable challenge. Arguably, nowhere is this more difficult than the Antarctic Peninsula and the subantarctic South Atlantic where observational records are relatively short but where high rates of warming have been experienced since records began. Here we interrogate recently developed monthly-resolved observational datasets from the Falkland Islands and South Georgia, and extend the records back using climate-sensitive peat growth over the past 6000 years. Investigating the subantarctic climate data with ERA-Interim and Twentieth Century Reanalysis, we find that a stepped increase in precipitation across the 1940s is related to a change in synoptic atmospheric circulation: a westward migration of quasi-permanent positive pressure anomalies in the South Atlantic has brought the subantarctic islands under the increased influence of meridional airflow associated with the Amundsen Sea Low. Analysis of three comprehensively multi-dated (using 14C and 137Cs) peat sequences across the two islands demonstrates unprecedented growth rates since the mid-twentieth century relative to the last 6000 years. Comparison to observational and reconstructed sea surface temperatures suggests this change is linked to a warming tropical Pacific Ocean. Our results imply ‘modern’ South Atlantic atmospheric circulation has not been under this configuration for millennia.en_NZ
dc.format.mimetypeapplication/pdf
dc.identifier.citationTurney, C. S. M., Jones, R. T., Lister, D., Jones, P., Williams, A. N., Hogg, A. G., … Visbeck, M. (2016). Anomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 years. Environmental Research Letters, 11(6), 064009–064009. http://doi.org/10.1088/1748-9326/11/6/064009en
dc.identifier.doi10.1088/1748-9326/11/6/064009en_NZ
dc.identifier.eissn1748-9326en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/10464
dc.language.isoen
dc.publisherIOP Publishing Ltden_NZ
dc.relation.isPartOfEnvironmental Research Lettersen_NZ
dc.relation.urihttp://iopscience.iop.org/article/10.1088/1748-9326/11/6/064009/meta;jsessionid=CC6A76740B49BD96778CC34562167C46.c1.iopscience.cld.iop.orgen_NZ
dc.rightsThis article is published under Creative Commons Attribution 3.0 licence.
dc.subjectsouthern annular mode (SAM)en_NZ
dc.subjectSouthern Hemisphere westerliesen_NZ
dc.subjectsubantarctic climate extremesen_NZ
dc.subjecttemperatureen_NZ
dc.subjectclimate reanalysisen_NZ
dc.subjectanthropogenic climate changeen_NZ
dc.subjectEl Nino-Southern Oscillation (ENSO)en_NZ
dc.titleAnomalous mid-twentieth century atmospheric circulation change over the South Atlantic compared to the last 6000 yearsen_NZ
dc.typeJournal Article
pubs.begin-page064009
pubs.elements-id139433
pubs.end-page064009
pubs.issue6en_NZ
pubs.notesEBSCOhost confirms peer revieweden_NZ
pubs.organisational-group/Waikato
pubs.organisational-group/Waikato/FSEN
pubs.organisational-group/Waikato/FSEN/School of Science
pubs.volume11en_NZ
uow.verification.statusverified
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