A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles
<p>Close coupling of Iberian hydroclimate and North Atlantic sea surface temperature (SST) during recent glacial periods has been identified through the analysis of marine sediment and pollen grains co-deposited on the Portuguese continental margin. While offering precisely correlatable record...
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Copernicus Publications
2018-12-01
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Series: | Climate of the Past |
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English |
format |
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DOAJ |
author |
R. F. Denniston A. N. Houts A. N. Houts Y. Asmerom A. D. Wanamaker Jr. J. A. Haws J. A. Haws V. J. Polyak D. L. Thatcher S. Altan-Ochir S. Altan-Ochir A. C. Borowske A. C. Borowske S. F. M. Breitenbach C. C. Ummenhofer F. T. Regala F. T. Regala M. M. Benedetti M. M. Benedetti N. F. Bicho |
spellingShingle |
R. F. Denniston A. N. Houts A. N. Houts Y. Asmerom A. D. Wanamaker Jr. J. A. Haws J. A. Haws V. J. Polyak D. L. Thatcher S. Altan-Ochir S. Altan-Ochir A. C. Borowske A. C. Borowske S. F. M. Breitenbach C. C. Ummenhofer F. T. Regala F. T. Regala M. M. Benedetti M. M. Benedetti N. F. Bicho A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles Climate of the Past |
author_facet |
R. F. Denniston A. N. Houts A. N. Houts Y. Asmerom A. D. Wanamaker Jr. J. A. Haws J. A. Haws V. J. Polyak D. L. Thatcher S. Altan-Ochir S. Altan-Ochir A. C. Borowske A. C. Borowske S. F. M. Breitenbach C. C. Ummenhofer F. T. Regala F. T. Regala M. M. Benedetti M. M. Benedetti N. F. Bicho |
author_sort |
R. F. Denniston |
title |
A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles |
title_short |
A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles |
title_full |
A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles |
title_fullStr |
A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles |
title_full_unstemmed |
A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles |
title_sort |
stalagmite test of north atlantic sst and iberian hydroclimate linkages over the last two glacial cycles |
publisher |
Copernicus Publications |
series |
Climate of the Past |
issn |
1814-9324 1814-9332 |
publishDate |
2018-12-01 |
description |
<p>Close coupling of Iberian hydroclimate and North Atlantic sea
surface temperature (SST) during recent glacial periods has been identified
through the analysis of marine sediment and pollen grains co-deposited on the
Portuguese continental margin. While offering precisely correlatable records,
these time series have lacked a directly dated, site-specific record of
continental Iberian climate spanning multiple glacial cycles as a point of
comparison. Here we present a high-resolution, multi-proxy (growth dynamics
and
<span class="inline-formula"><i>δ</i><sup>13</sup>C</span>, <span class="inline-formula"><i>δ</i><sup>18</sup>O</span>, and <span class="inline-formula"><i>δ</i><sup>234</sup>U</span>
values) composite stalagmite record of hydroclimate from two caves in western
Portugal across the majority of the last two glacial cycles (<span class="inline-formula">∼220</span> ka).
At orbital and millennial scales, stalagmite-based proxies for hydroclimate
proxies covaried with SST, with elevated <span class="inline-formula"><i>δ</i><sup>13</sup>C</span>,
<span class="inline-formula"><i>δ</i><sup>18</sup>O</span>, and <span class="inline-formula"><i>δ</i><sup>234</sup>U</span> values and/or growth hiatuses
indicating reduced effective moisture coincident with periods of lowered SST
during major ice-rafted debris events, in agreement with changes in
palynological reconstructions of continental climate. While in many cases the
Portuguese stalagmite record can be scaled to SST, in some intervals the
magnitudes of stalagmite isotopic shifts, and possibly hydroclimate, appear
to have been somewhat decoupled from SST.</p> |
url |
https://www.clim-past.net/14/1893/2018/cp-14-1893-2018.pdf |
work_keys_str_mv |
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spelling |
doaj-52c0d99b7fa94e62b0bf113b3cdaa0e12020-11-24T21:40:25ZengCopernicus PublicationsClimate of the Past1814-93241814-93322018-12-01141893191310.5194/cp-14-1893-2018A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cyclesR. F. Denniston0A. N. Houts1A. N. Houts2Y. Asmerom3A. D. Wanamaker Jr.4J. A. Haws5J. A. Haws6V. J. Polyak7D. L. Thatcher8S. Altan-Ochir9S. Altan-Ochir10A. C. Borowske11A. C. Borowske12S. F. M. Breitenbach13C. C. Ummenhofer14F. T. Regala15F. T. Regala16M. M. Benedetti17M. M. Benedetti18N. F. Bicho19Department of Geology, Cornell College, Mount Vernon, Iowa 52314, USADepartment of Geology, Cornell College, Mount Vernon, Iowa 52314, USAcurrent address: Department of Earth Sciences, University of New Hampshire, Durham, New Hampshire 03824, USADepartment of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USADepartment of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa 50011, USADepartment of Anthropology, University of Louisville, Louisville, Kentucky 40208, USAInterdisciplinary Center for Archaeology and Evolution of Human Behaviour (ICArEHB), Universidade do Algarve, Faro, PortugalDepartment of Earth and Planetary Sciences, University of New Mexico, Albuquerque, New Mexico 87131, USADepartment of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa 50011, USADepartment of Geology, Cornell College, Mount Vernon, Iowa 52314, USAcurrent address: Department of Geosciences, École Normale Supérieure, PSL Res. Univ., Paris, FranceDepartment of Geology, Cornell College, Mount Vernon, Iowa 52314, USAcurrent address: Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, Connecticut 06269, USAInstitute for Geology, Mineralogy, and Geophysics, Ruhr-University, 44801 Bochum, GermanyDepartment of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USAAssociação de Estudos Subterrâneos e Defesa do Ambiente, Torres Vedras, PortugalInterdisciplinary Center for Archaeology and Evolution of Human Behaviour (ICArEHB), Universidade do Algarve, Faro, PortugalDepartment of Earth and Ocean Sciences, University of North Carolina Wilmington, Wilmington, North Carolina 28403, USAInterdisciplinary Center for Archaeology and Evolution of Human Behaviour (ICArEHB), Universidade do Algarve, Faro, PortugalInterdisciplinary Center for Archaeology and Evolution of Human Behaviour (ICArEHB), Universidade do Algarve, Faro, Portugal<p>Close coupling of Iberian hydroclimate and North Atlantic sea surface temperature (SST) during recent glacial periods has been identified through the analysis of marine sediment and pollen grains co-deposited on the Portuguese continental margin. While offering precisely correlatable records, these time series have lacked a directly dated, site-specific record of continental Iberian climate spanning multiple glacial cycles as a point of comparison. Here we present a high-resolution, multi-proxy (growth dynamics and <span class="inline-formula"><i>δ</i><sup>13</sup>C</span>, <span class="inline-formula"><i>δ</i><sup>18</sup>O</span>, and <span class="inline-formula"><i>δ</i><sup>234</sup>U</span> values) composite stalagmite record of hydroclimate from two caves in western Portugal across the majority of the last two glacial cycles (<span class="inline-formula">∼220</span> ka). At orbital and millennial scales, stalagmite-based proxies for hydroclimate proxies covaried with SST, with elevated <span class="inline-formula"><i>δ</i><sup>13</sup>C</span>, <span class="inline-formula"><i>δ</i><sup>18</sup>O</span>, and <span class="inline-formula"><i>δ</i><sup>234</sup>U</span> values and/or growth hiatuses indicating reduced effective moisture coincident with periods of lowered SST during major ice-rafted debris events, in agreement with changes in palynological reconstructions of continental climate. While in many cases the Portuguese stalagmite record can be scaled to SST, in some intervals the magnitudes of stalagmite isotopic shifts, and possibly hydroclimate, appear to have been somewhat decoupled from SST.</p>https://www.clim-past.net/14/1893/2018/cp-14-1893-2018.pdf |