A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles
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...
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ftdoajarticles:oai:doaj.org/article:52c0d99b7fa94e62b0bf113b3cdaa0e1 2023-05-15T17:30:36+02:00 A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles 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 2018-12-01T00:00:00Z https://doi.org/10.5194/cp-14-1893-2018 https://doaj.org/article/52c0d99b7fa94e62b0bf113b3cdaa0e1 EN eng Copernicus Publications https://www.clim-past.net/14/1893/2018/cp-14-1893-2018.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-14-1893-2018 1814-9324 1814-9332 https://doaj.org/article/52c0d99b7fa94e62b0bf113b3cdaa0e1 Climate of the Past, Vol 14, Pp 1893-1913 (2018) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2018 ftdoajarticles https://doi.org/10.5194/cp-14-1893-2018 2022-12-31T13:58:06Z 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 δ 13 C , δ 18 O , and δ 234 U values) composite stalagmite record of hydroclimate from two caves in western Portugal across the majority of the last two glacial cycles ( ∼220 ka). At orbital and millennial scales, stalagmite-based proxies for hydroclimate proxies covaried with SST, with elevated δ 13 C , δ 18 O , and δ 234 U 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. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Climate of the Past 14 12 1893 1913 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 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 A stalagmite test of North Atlantic SST and Iberian hydroclimate linkages over the last two glacial cycles |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
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 δ 13 C , δ 18 O , and δ 234 U values) composite stalagmite record of hydroclimate from two caves in western Portugal across the majority of the last two glacial cycles ( ∼220 ka). At orbital and millennial scales, stalagmite-based proxies for hydroclimate proxies covaried with SST, with elevated δ 13 C , δ 18 O , and δ 234 U 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. |
format |
Article in Journal/Newspaper |
author |
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 |
author_facet |
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 |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-1893-2018 https://doaj.org/article/52c0d99b7fa94e62b0bf113b3cdaa0e1 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Climate of the Past, Vol 14, Pp 1893-1913 (2018) |
op_relation |
https://www.clim-past.net/14/1893/2018/cp-14-1893-2018.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-14-1893-2018 1814-9324 1814-9332 https://doaj.org/article/52c0d99b7fa94e62b0bf113b3cdaa0e1 |
op_doi |
https://doi.org/10.5194/cp-14-1893-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
12 |
container_start_page |
1893 |
op_container_end_page |
1913 |
_version_ |
1766127463462600704 |