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Article: Sea surface temperature and salinity variability at Bermuda during the end of the Little Ice Age

TitleSea surface temperature and salinity variability at Bermuda during the end of the Little Ice Age
Authors
Issue Date2008
Citation
Paleoceanography, 2008, v. 23 n. 3 How to Cite?
AbstractWe use geochemical and isotope measurements on a 225-year old brain coral (Diploria labyrinthiformis) from the south shore of Bermuda (64W, 32N) to construct a record of decadal-to-centennial-scale climate variability. The coral was collected alive, and annual density bands visible in X radiographs delineate cold and warm seasons allowing for precise dating. Coral skeletons incorporate strontium (Sr) and calcium (Ca) in relative proportions inversely to the sea surface temperature (SST) in which the skeleton is secreted. Previous studies on this and other coral colonies from this region document the ability to reconstruct mean annual and wintertime SST using Sr/Ca measurements (Goodkin et al., 2007, 2005). The coral-based records of SST for the past 2 centuries show abrupt shifts at both decadal and centennial timescales and suggest that SST at the end of the Little Ice Age (between 1840 and 1860) was 1.5 ± 0.4C colder than today (1990s). Coral-reconstructed SST has a greater magnitude change than does a gridded instrumental SST record from this region. This may result from several physical processes including high rates of mesoscale eddy propagation in this region. Oxygen isotope values (δ18O) of the coral skeleton reflect changes in both temperature and the (δ 18O of seawater (δOw), where δOw is proportional to sea surface salinity (SSS). We show in this study that mean annual and wintertime (δ18O of the carbonate (δO c) are correlated to both SST and SSS, but a robust, quantitative measure of SSS is not found with present calibration data. In combination, however, the Sr/Ca and δOc qualitatively reconstruct lower salinities at the end of the Little Ice Age relative to modern day. Temperature changes agree with other records from the Bermuda region. Radiative and atmospheric forcing may explain some of the SST variability, but the scales of implied changes in SST and SSS indicate large-scale ocean circulation impacts as well. Copyright 2008 by the American Geophysical Union.
Persistent Identifierhttp://hdl.handle.net/10722/151281
ISSN
2015 Impact Factor: 3.433
2015 SCImago Journal Rankings: 3.067
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorGoodkin, NFen_US
dc.contributor.authorHughen, KAen_US
dc.contributor.authorCurry, WBen_US
dc.contributor.authorDoney, SCen_US
dc.contributor.authorOstermann, DRen_US
dc.date.accessioned2012-06-26T06:20:00Z-
dc.date.available2012-06-26T06:20:00Z-
dc.date.issued2008en_US
dc.identifier.citationPaleoceanography, 2008, v. 23 n. 3en_US
dc.identifier.issn0883-8305en_US
dc.identifier.urihttp://hdl.handle.net/10722/151281-
dc.description.abstractWe use geochemical and isotope measurements on a 225-year old brain coral (Diploria labyrinthiformis) from the south shore of Bermuda (64W, 32N) to construct a record of decadal-to-centennial-scale climate variability. The coral was collected alive, and annual density bands visible in X radiographs delineate cold and warm seasons allowing for precise dating. Coral skeletons incorporate strontium (Sr) and calcium (Ca) in relative proportions inversely to the sea surface temperature (SST) in which the skeleton is secreted. Previous studies on this and other coral colonies from this region document the ability to reconstruct mean annual and wintertime SST using Sr/Ca measurements (Goodkin et al., 2007, 2005). The coral-based records of SST for the past 2 centuries show abrupt shifts at both decadal and centennial timescales and suggest that SST at the end of the Little Ice Age (between 1840 and 1860) was 1.5 ± 0.4C colder than today (1990s). Coral-reconstructed SST has a greater magnitude change than does a gridded instrumental SST record from this region. This may result from several physical processes including high rates of mesoscale eddy propagation in this region. Oxygen isotope values (δ18O) of the coral skeleton reflect changes in both temperature and the (δ 18O of seawater (δOw), where δOw is proportional to sea surface salinity (SSS). We show in this study that mean annual and wintertime (δ18O of the carbonate (δO c) are correlated to both SST and SSS, but a robust, quantitative measure of SSS is not found with present calibration data. In combination, however, the Sr/Ca and δOc qualitatively reconstruct lower salinities at the end of the Little Ice Age relative to modern day. Temperature changes agree with other records from the Bermuda region. Radiative and atmospheric forcing may explain some of the SST variability, but the scales of implied changes in SST and SSS indicate large-scale ocean circulation impacts as well. Copyright 2008 by the American Geophysical Union.en_US
dc.languageengen_US
dc.relation.ispartofPaleoceanographyen_US
dc.titleSea surface temperature and salinity variability at Bermuda during the end of the Little Ice Ageen_US
dc.typeArticleen_US
dc.identifier.emailGoodkin, NF:goodkin@hkucc.hku.hken_US
dc.identifier.authorityGoodkin, NF=rp00700en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1029/2007PA001532en_US
dc.identifier.scopuseid_2-s2.0-65349173935en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-65349173935&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume23en_US
dc.identifier.issue3en_US
dc.identifier.isiWOS:000257747900002-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridGoodkin, NF=12446578100en_US
dc.identifier.scopusauthoridHughen, KA=6701562711en_US
dc.identifier.scopusauthoridCurry, WB=7005309236en_US
dc.identifier.scopusauthoridDoney, SC=35498837200en_US
dc.identifier.scopusauthoridOstermann, DR=6602954594en_US

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