Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records.
Diatom-based oxygen isotope data (δ18Odiatom) from Lake Malawi show multi-centennial scale wet�dry intervals spaced approximately every 2.3 ka throughout a 25 ka sequence. The δ18Odiatom record is supported by a lower resolution deuterium (δDpa)isotope curve derived from palmitic acid. We inter...
Published in: | Earth and Planetary Science Letters |
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/657/ https://eprints.lancs.ac.uk/id/eprint/657/1/Barkeretal2007.pdf https://doi.org/10.1016/j.epsl.2007.06.010 |
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ftulancaster:oai:eprints.lancs.ac.uk:657 2023-08-27T04:09:46+02:00 Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. Barker, Philip A. Leng, Melanie J. Gasse, Françoise Huang, Yongsong 2007-09 application/pdf https://eprints.lancs.ac.uk/id/eprint/657/ https://eprints.lancs.ac.uk/id/eprint/657/1/Barkeretal2007.pdf https://doi.org/10.1016/j.epsl.2007.06.010 en eng https://eprints.lancs.ac.uk/id/eprint/657/1/Barkeretal2007.pdf Barker, Philip A. and Leng, Melanie J. and Gasse, Françoise and Huang, Yongsong (2007) Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. Earth and Planetary Science Letters, 261 (1-2). pp. 93-103. ISSN 0012-821X Journal Article PeerReviewed 2007 ftulancaster https://doi.org/10.1016/j.epsl.2007.06.010 2023-08-03T22:15:29Z Diatom-based oxygen isotope data (δ18Odiatom) from Lake Malawi show multi-centennial scale wetâ��dry intervals spaced approximately every 2.3 ka throughout a 25 ka sequence. The δ18Odiatom record is supported by a lower resolution deuterium (δDpa)isotope curve derived from palmitic acid. We interpret these isotope data in terms of major shifts in precipitation and evaporation moderated by seasonal controls on the host organisms. Dry periods marked by relatively positive isotope values, represent the extension of abrupt Holocene events noted from northern and equatorial Africa to 10â��15°S. These events in Lake Malawi correspond to cool episodes in Greenland, thereby demonstrating teleconnections generated by meridional temperature gradients. Sea surface temperatures are likely to be the primary transmitter of deglacial climate changes, although trade wind strength and direction is critical in controlling precipitation patterns in tropical regions. Conversely, the global hydrological cycle, driven by low latitude regions represents an important positive feedback amplifying deglacial processes. Article in Journal/Newspaper Greenland Lancaster University: Lancaster Eprints Greenland Earth and Planetary Science Letters 261 1-2 93 103 |
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Open Polar |
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Lancaster University: Lancaster Eprints |
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ftulancaster |
language |
English |
description |
Diatom-based oxygen isotope data (δ18Odiatom) from Lake Malawi show multi-centennial scale wet�dry intervals spaced approximately every 2.3 ka throughout a 25 ka sequence. The δ18Odiatom record is supported by a lower resolution deuterium (δDpa)isotope curve derived from palmitic acid. We interpret these isotope data in terms of major shifts in precipitation and evaporation moderated by seasonal controls on the host organisms. Dry periods marked by relatively positive isotope values, represent the extension of abrupt Holocene events noted from northern and equatorial Africa to 10�15°S. These events in Lake Malawi correspond to cool episodes in Greenland, thereby demonstrating teleconnections generated by meridional temperature gradients. Sea surface temperatures are likely to be the primary transmitter of deglacial climate changes, although trade wind strength and direction is critical in controlling precipitation patterns in tropical regions. Conversely, the global hydrological cycle, driven by low latitude regions represents an important positive feedback amplifying deglacial processes. |
format |
Article in Journal/Newspaper |
author |
Barker, Philip A. Leng, Melanie J. Gasse, Françoise Huang, Yongsong |
spellingShingle |
Barker, Philip A. Leng, Melanie J. Gasse, Françoise Huang, Yongsong Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. |
author_facet |
Barker, Philip A. Leng, Melanie J. Gasse, Françoise Huang, Yongsong |
author_sort |
Barker, Philip A. |
title |
Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. |
title_short |
Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. |
title_full |
Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. |
title_fullStr |
Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. |
title_full_unstemmed |
Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. |
title_sort |
century-to-millennial scale climatic variability in lake malawi revealed by isotope records. |
publishDate |
2007 |
url |
https://eprints.lancs.ac.uk/id/eprint/657/ https://eprints.lancs.ac.uk/id/eprint/657/1/Barkeretal2007.pdf https://doi.org/10.1016/j.epsl.2007.06.010 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/657/1/Barkeretal2007.pdf Barker, Philip A. and Leng, Melanie J. and Gasse, Françoise and Huang, Yongsong (2007) Century-to-millennial scale climatic variability in Lake Malawi revealed by isotope records. Earth and Planetary Science Letters, 261 (1-2). pp. 93-103. ISSN 0012-821X |
op_doi |
https://doi.org/10.1016/j.epsl.2007.06.010 |
container_title |
Earth and Planetary Science Letters |
container_volume |
261 |
container_issue |
1-2 |
container_start_page |
93 |
op_container_end_page |
103 |
_version_ |
1775351342722711552 |