Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977
19 pages, 5 figures, 4 tables.-- Printed version published Nov 30, 2004. Detailed analysis of the planktonic foraminifera assemblages of ODP Site 977, situated in the Alboran Sea (36°1,9′N; 1°57,3′W), led us to recognize 42 planktonic foraminiferal events that occurred during marine isotope stages (...
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Online Access: | http://hdl.handle.net/10261/17639 https://doi.org/10.1016/j.margeo.2004.08.002 |
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ftcsic:oai:digital.csic.es:10261/17639 2024-02-11T10:05:55+01:00 Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 Pérez-Folgado, Marta Sierro, Francisco Javier Flores, José Abel Grimalt, Joan O. Zahn, Rainer 2004-09-29 22195 bytes application/pdf http://hdl.handle.net/10261/17639 https://doi.org/10.1016/j.margeo.2004.08.002 en eng Elsevier http://dx.doi.org/10.1016/j.margeo.2004.08.002 Marine Geology 212 (1-4): 113-131 (2004) 0025-3227 http://hdl.handle.net/10261/17639 doi:10.1016/j.margeo.2004.08.002 none Organic rich layers Alboran Sea Marine isotope stage 5 Planktic foraminifera Paleotemperatures Millennial variability artículo http://purl.org/coar/resource_type/c_6501 2004 ftcsic https://doi.org/10.1016/j.margeo.2004.08.002 2024-01-16T09:23:58Z 19 pages, 5 figures, 4 tables.-- Printed version published Nov 30, 2004. Detailed analysis of the planktonic foraminifera assemblages of ODP Site 977, situated in the Alboran Sea (36°1,9′N; 1°57,3′W), led us to recognize 42 planktonic foraminiferal events that occurred during marine isotope stages (MIS) 4 and 5. These events were defined by changes in the abundances of Neogloboquadrina pachyderma (right and left coiling), Turborotalita quinqueloba, Globorotalia scitula, Globorotalia inflata, Globigerina bulloides and Globigerinoides ruber (white and pink varieties). Foraminiferal assemblages changed in response to glacial–interglacial and millennial climate variability throughout the last 150 ka. Based on the estimation of sea surface temperatures (SST) using the modern analog technique and the oxygen isotope data measured in G. bulloides, we inferred the oxygen isotopic composition of sea water (δw). SST increased in the Alboran Sea during the main Dansgaard–Oeschger Interstadials, such as interstadial 19 to 24. Even though N. pachyderma (left coiling) is very scarce before Heinrich Event (HE) 6, three cold pulses can be identified, between 65 and 85 ka ago. Moreover, increases in abundance of T. quinqueloba and G. scitula are recorded during D–O Stadials 20 and 21. The maximum temperature, which was attained during the Last Interglacial, was about 2 °C higher than recent temperature and that reached over the Holocene. Planktic foraminifera assemblages and paleotemperatures remained cold 3 ka after the beginning of Termination II (T-II), 130 ka ago, probably in connection with the occurrence of Heinrich event 11 in the North Atlantic. The abundance of G. bulloides during the deposition of organic rich layers (ORLs) of MIS 5, accompanied by lower isotope values in surface waters (δw), could indicate the presence of a fresher surface layer associated with an increase in marine surface productivity. This work was funded by DGCYT projects PB-98-0288, FEDER 1FD1997-1148 (CLI) and BTE2002-04670, and by the ... Article in Journal/Newspaper Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera Digital.CSIC (Spanish National Research Council) Marine Geology 212 1-4 113 131 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Organic rich layers Alboran Sea Marine isotope stage 5 Planktic foraminifera Paleotemperatures Millennial variability |
spellingShingle |
Organic rich layers Alboran Sea Marine isotope stage 5 Planktic foraminifera Paleotemperatures Millennial variability Pérez-Folgado, Marta Sierro, Francisco Javier Flores, José Abel Grimalt, Joan O. Zahn, Rainer Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 |
topic_facet |
Organic rich layers Alboran Sea Marine isotope stage 5 Planktic foraminifera Paleotemperatures Millennial variability |
description |
19 pages, 5 figures, 4 tables.-- Printed version published Nov 30, 2004. Detailed analysis of the planktonic foraminifera assemblages of ODP Site 977, situated in the Alboran Sea (36°1,9′N; 1°57,3′W), led us to recognize 42 planktonic foraminiferal events that occurred during marine isotope stages (MIS) 4 and 5. These events were defined by changes in the abundances of Neogloboquadrina pachyderma (right and left coiling), Turborotalita quinqueloba, Globorotalia scitula, Globorotalia inflata, Globigerina bulloides and Globigerinoides ruber (white and pink varieties). Foraminiferal assemblages changed in response to glacial–interglacial and millennial climate variability throughout the last 150 ka. Based on the estimation of sea surface temperatures (SST) using the modern analog technique and the oxygen isotope data measured in G. bulloides, we inferred the oxygen isotopic composition of sea water (δw). SST increased in the Alboran Sea during the main Dansgaard–Oeschger Interstadials, such as interstadial 19 to 24. Even though N. pachyderma (left coiling) is very scarce before Heinrich Event (HE) 6, three cold pulses can be identified, between 65 and 85 ka ago. Moreover, increases in abundance of T. quinqueloba and G. scitula are recorded during D–O Stadials 20 and 21. The maximum temperature, which was attained during the Last Interglacial, was about 2 °C higher than recent temperature and that reached over the Holocene. Planktic foraminifera assemblages and paleotemperatures remained cold 3 ka after the beginning of Termination II (T-II), 130 ka ago, probably in connection with the occurrence of Heinrich event 11 in the North Atlantic. The abundance of G. bulloides during the deposition of organic rich layers (ORLs) of MIS 5, accompanied by lower isotope values in surface waters (δw), could indicate the presence of a fresher surface layer associated with an increase in marine surface productivity. This work was funded by DGCYT projects PB-98-0288, FEDER 1FD1997-1148 (CLI) and BTE2002-04670, and by the ... |
format |
Article in Journal/Newspaper |
author |
Pérez-Folgado, Marta Sierro, Francisco Javier Flores, José Abel Grimalt, Joan O. Zahn, Rainer |
author_facet |
Pérez-Folgado, Marta Sierro, Francisco Javier Flores, José Abel Grimalt, Joan O. Zahn, Rainer |
author_sort |
Pérez-Folgado, Marta |
title |
Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 |
title_short |
Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 |
title_full |
Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 |
title_fullStr |
Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 |
title_full_unstemmed |
Paleoclimatic variations in foraminifer assemblages from the Alboran Sea (Western Mediterranean) during the last 150 ka in ODP Site 977 |
title_sort |
paleoclimatic variations in foraminifer assemblages from the alboran sea (western mediterranean) during the last 150 ka in odp site 977 |
publisher |
Elsevier |
publishDate |
2004 |
url |
http://hdl.handle.net/10261/17639 https://doi.org/10.1016/j.margeo.2004.08.002 |
genre |
Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
genre_facet |
Neogloboquadrina pachyderma North Atlantic Planktonic foraminifera |
op_relation |
http://dx.doi.org/10.1016/j.margeo.2004.08.002 Marine Geology 212 (1-4): 113-131 (2004) 0025-3227 http://hdl.handle.net/10261/17639 doi:10.1016/j.margeo.2004.08.002 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.margeo.2004.08.002 |
container_title |
Marine Geology |
container_volume |
212 |
container_issue |
1-4 |
container_start_page |
113 |
op_container_end_page |
131 |
_version_ |
1790603254887874560 |