Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals
The oxygen and carbon stable isotope compositions of cave speleothems provide a powerful method for understanding continental climate change. Here, we examine the question of the regionality of this isotopic record and its linkage with the marine isotopic record in the Eastern Mediterranean (EM) reg...
Published in: | Geochimica et Cosmochimica Acta |
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ftunisfloridatam:oai:digitalcommons.usf.edu:kip_articles-8208 2023-12-10T09:53:06+01:00 Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals Bar-Matthews, Miryam Ayalon, Avner Gilmour, Mabs Matthews, Alan 2003-01-01T08:00:00Z https://digitalcommons.usf.edu/kip_articles/7208 https://doi.org/10.1016/S0016-7037(02)01031-1 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/kip_articles/7208 doi:10.1016/S0016-7037(02)01031-1 https://doi.org/10.1016/S0016-7037(02)01031-1 KIP Articles text 2003 ftunisfloridatam https://doi.org/10.1016/S0016-7037(02)01031-1 2023-11-16T19:07:43Z The oxygen and carbon stable isotope compositions of cave speleothems provide a powerful method for understanding continental climate change. Here, we examine the question of the regionality of this isotopic record and its linkage with the marine isotopic record in the Eastern Mediterranean (EM) region. The study presents a new, accurately dated 250-kyr δ18O and δ13C record determined from speleothems of the Peqiin Cave, Northern Israel. Its comparison with the continuous 185-kyr isotopic record of the Soreq Cave speleothems from Central Israel reveals striking similarities. Thus, a strong regional climatic signal, brought about by variations in temperature and rainfall amount, is reflected in both cave records. Low δ18O minima in the Peqiin profile for the last 250- to 185-kyr period (interglacial marine isotopic stage 7) match the timing of sapropels 9 to 7 and are indicative of high rainfall in the EM region at these times. The combined Soreq and Peqiin δ18O record for the last 250 kyr excellently matches the published Globigerinoides ruber (G. ruber) marine δ18O record for the EM Sea, with the isotopic compositional difference ΔG.ruber-speleothems remaining relatively constant at −5.6 ± 0.7‰, thus establishing for the first time a robust, exploitable link between the land and the marine isotopic records. The correspondence of low δ18O speleothem values and high cave water stands with low G. ruber δ18O values during interglacial sapropel events indicates that these periods were characterized by enhanced rainfall in the EM land and sea regions. By use of sea surface temperatures derived from alkenone data as a proxy for land temperatures at the Soreq Cave, we calculate the paleorainfall δ18O values and its amounts. Maximum rainfall and lowest temperature conditions occurred at the beginning of the sapropel events and were followed by decrease in rainfall and increase in temperatures, leading to arid conditions. The record for the last 7000 yr shows a trend toward increasing aridity and agrees well with ... Text Planktonic foraminifera Digital Commons University of South Florida (USF) Geochimica et Cosmochimica Acta 67 17 3181 3199 |
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Digital Commons University of South Florida (USF) |
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ftunisfloridatam |
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unknown |
description |
The oxygen and carbon stable isotope compositions of cave speleothems provide a powerful method for understanding continental climate change. Here, we examine the question of the regionality of this isotopic record and its linkage with the marine isotopic record in the Eastern Mediterranean (EM) region. The study presents a new, accurately dated 250-kyr δ18O and δ13C record determined from speleothems of the Peqiin Cave, Northern Israel. Its comparison with the continuous 185-kyr isotopic record of the Soreq Cave speleothems from Central Israel reveals striking similarities. Thus, a strong regional climatic signal, brought about by variations in temperature and rainfall amount, is reflected in both cave records. Low δ18O minima in the Peqiin profile for the last 250- to 185-kyr period (interglacial marine isotopic stage 7) match the timing of sapropels 9 to 7 and are indicative of high rainfall in the EM region at these times. The combined Soreq and Peqiin δ18O record for the last 250 kyr excellently matches the published Globigerinoides ruber (G. ruber) marine δ18O record for the EM Sea, with the isotopic compositional difference ΔG.ruber-speleothems remaining relatively constant at −5.6 ± 0.7‰, thus establishing for the first time a robust, exploitable link between the land and the marine isotopic records. The correspondence of low δ18O speleothem values and high cave water stands with low G. ruber δ18O values during interglacial sapropel events indicates that these periods were characterized by enhanced rainfall in the EM land and sea regions. By use of sea surface temperatures derived from alkenone data as a proxy for land temperatures at the Soreq Cave, we calculate the paleorainfall δ18O values and its amounts. Maximum rainfall and lowest temperature conditions occurred at the beginning of the sapropel events and were followed by decrease in rainfall and increase in temperatures, leading to arid conditions. The record for the last 7000 yr shows a trend toward increasing aridity and agrees well with ... |
format |
Text |
author |
Bar-Matthews, Miryam Ayalon, Avner Gilmour, Mabs Matthews, Alan |
spellingShingle |
Bar-Matthews, Miryam Ayalon, Avner Gilmour, Mabs Matthews, Alan Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals |
author_facet |
Bar-Matthews, Miryam Ayalon, Avner Gilmour, Mabs Matthews, Alan |
author_sort |
Bar-Matthews, Miryam |
title |
Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals |
title_short |
Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals |
title_full |
Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals |
title_fullStr |
Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals |
title_full_unstemmed |
Sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleorainfall during interglacial intervals |
title_sort |
sea–land oxygen isotopic relationships from planktonic foraminifera and speleothems in the eastern mediterranean region and their implication for paleorainfall during interglacial intervals |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2003 |
url |
https://digitalcommons.usf.edu/kip_articles/7208 https://doi.org/10.1016/S0016-7037(02)01031-1 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
KIP Articles |
op_relation |
https://digitalcommons.usf.edu/kip_articles/7208 doi:10.1016/S0016-7037(02)01031-1 https://doi.org/10.1016/S0016-7037(02)01031-1 |
op_doi |
https://doi.org/10.1016/S0016-7037(02)01031-1 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
67 |
container_issue |
17 |
container_start_page |
3181 |
op_container_end_page |
3199 |
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1784899644964208640 |