A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments
A record of the hydrogen isotopic composition of terrestrial leaf waxes (δDwax) in sediment cores from Lake Titicaca provides new insight into the precipitation history of the Central Andes and controls of South American Summer Monsoon (SASM) variability since the last glacial period. Comparison of...
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ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1453 2023-11-12T04:18:37+01:00 A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments Fornace, Kyrstin L. Hughen, Konrad A. Shanahan, Timothy M. Fritz, Sherilyn C. Baker, Paul A. Sylva, Sean P. 2014-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/geosciencefacpub/449 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1453/viewcontent/Fritz_2014_EPSL_A_60_000_year_record__DC_VERSION.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/geosciencefacpub/449 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1453/viewcontent/Fritz_2014_EPSL_A_60_000_year_record__DC_VERSION.pdf Papers in the Earth and Atmospheric Sciences Lake Titicaca South American Summer Monsoon stable hydrogen isotopes leaf wax last glacial period Holocene Earth Sciences text 2014 ftunivnebraskali 2023-10-30T11:23:05Z A record of the hydrogen isotopic composition of terrestrial leaf waxes (δDwax) in sediment cores from Lake Titicaca provides new insight into the precipitation history of the Central Andes and controls of South American Summer Monsoon (SASM) variability since the last glacial period. Comparison of the δDwax record with a 19-kyr δD record from the nearby Illimani ice core supports the interpretation that precipitation δD is the primary control on δDwax with a lesser but significant role for local evapotranspiration and other secondary influences on δDwax. The Titicaca δDwax record con-firms overall wetter conditions in the Central Andes during the last glacial period relative to a drier Holocene. During the last deglaciation, abrupt δDwax shifts correspond to millennial-scale events ob-served in the high-latitude North Atlantic, with dry conditions corresponding to the Bølling–Allerød and early Holocene periods and wetter conditions during late glacial and Younger Dryas intervals. We observe a trend of increasing monsoonal precipitation from the early to the late Holocene, consistent with summer insolation forcing of the SASM, but similar hydrologic variability on precessional timescales is not apparent during the last glacial period. Overall, this study demonstrates the relative importance of high-latitude versus tropical forcing as a dominant control on glacial SASM precipitation variability. Text ice core North Atlantic University of Nebraska-Lincoln: DigitalCommons@UNL |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
Lake Titicaca South American Summer Monsoon stable hydrogen isotopes leaf wax last glacial period Holocene Earth Sciences |
spellingShingle |
Lake Titicaca South American Summer Monsoon stable hydrogen isotopes leaf wax last glacial period Holocene Earth Sciences Fornace, Kyrstin L. Hughen, Konrad A. Shanahan, Timothy M. Fritz, Sherilyn C. Baker, Paul A. Sylva, Sean P. A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments |
topic_facet |
Lake Titicaca South American Summer Monsoon stable hydrogen isotopes leaf wax last glacial period Holocene Earth Sciences |
description |
A record of the hydrogen isotopic composition of terrestrial leaf waxes (δDwax) in sediment cores from Lake Titicaca provides new insight into the precipitation history of the Central Andes and controls of South American Summer Monsoon (SASM) variability since the last glacial period. Comparison of the δDwax record with a 19-kyr δD record from the nearby Illimani ice core supports the interpretation that precipitation δD is the primary control on δDwax with a lesser but significant role for local evapotranspiration and other secondary influences on δDwax. The Titicaca δDwax record con-firms overall wetter conditions in the Central Andes during the last glacial period relative to a drier Holocene. During the last deglaciation, abrupt δDwax shifts correspond to millennial-scale events ob-served in the high-latitude North Atlantic, with dry conditions corresponding to the Bølling–Allerød and early Holocene periods and wetter conditions during late glacial and Younger Dryas intervals. We observe a trend of increasing monsoonal precipitation from the early to the late Holocene, consistent with summer insolation forcing of the SASM, but similar hydrologic variability on precessional timescales is not apparent during the last glacial period. Overall, this study demonstrates the relative importance of high-latitude versus tropical forcing as a dominant control on glacial SASM precipitation variability. |
format |
Text |
author |
Fornace, Kyrstin L. Hughen, Konrad A. Shanahan, Timothy M. Fritz, Sherilyn C. Baker, Paul A. Sylva, Sean P. |
author_facet |
Fornace, Kyrstin L. Hughen, Konrad A. Shanahan, Timothy M. Fritz, Sherilyn C. Baker, Paul A. Sylva, Sean P. |
author_sort |
Fornace, Kyrstin L. |
title |
A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments |
title_short |
A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments |
title_full |
A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments |
title_fullStr |
A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments |
title_full_unstemmed |
A 60,000-year Record of Hydrologic Variability in the Central Andes from the Hydrogen Isotopic Composition of Leaf Waxes in Lake Titicaca Sediments |
title_sort |
60,000-year record of hydrologic variability in the central andes from the hydrogen isotopic composition of leaf waxes in lake titicaca sediments |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2014 |
url |
https://digitalcommons.unl.edu/geosciencefacpub/449 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1453/viewcontent/Fritz_2014_EPSL_A_60_000_year_record__DC_VERSION.pdf |
genre |
ice core North Atlantic |
genre_facet |
ice core North Atlantic |
op_source |
Papers in the Earth and Atmospheric Sciences |
op_relation |
https://digitalcommons.unl.edu/geosciencefacpub/449 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1453/viewcontent/Fritz_2014_EPSL_A_60_000_year_record__DC_VERSION.pdf |
_version_ |
1782335229335175168 |