A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles

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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Main Authors: R. F. Denniston, A. N. Houts, Y. Asmerom, A. D. Wanamaker Jr., J. A. Haws, V. J. Polyak, D. L. Thatcher, S. Altan-Ochir, A. C. Borowske, S. F. M. Breitenbach, C. C. Ummenhofer, F. T. Regala, M. M. Benedetti, N. F. Bicho
Format: Article
Language:English
Published: Copernicus Publications 2018-12-01
Series:Climate of the Past
Online Access:https://www.clim-past.net/14/1893/2018/cp-14-1893-2018.pdf
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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>&thinsp;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
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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>&thinsp;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

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