Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project
A 136-m-long drill core of sediments was recovered from tropical high-altitude Lake Titicaca, Bolivia-Peru, enabling a reconstruction of past climate that spans four cycles of regional glacial advance and retreat and that is estimated to extend continuously over the last 370,000 yr. Within the error...
Main Authors: | , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
DigitalCommons@University of Nebraska - Lincoln
2007
|
Subjects: | |
Online Access: | https://digitalcommons.unl.edu/geosciencefacpub/18 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1017/viewcontent/Fritz_QR_2007_Quat_glaciation__DC_VERSION_FIX_TABLE3__optimize.pdf |
id |
ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1017 |
---|---|
record_format |
openpolar |
spelling |
ftunivnebraskali:oai:digitalcommons.unl.edu:geosciencefacpub-1017 2023-11-12T04:18:47+01:00 Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project Fritz, Sherilyn C. Baker, Paul A. Seltzer, Geoffrey O. Ballantyne, Ashley Tapia, Pedro Cheng, Hai Edwards, R. Lawrence 2007-11-01T07:00:00Z application/pdf https://digitalcommons.unl.edu/geosciencefacpub/18 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1017/viewcontent/Fritz_QR_2007_Quat_glaciation__DC_VERSION_FIX_TABLE3__optimize.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/geosciencefacpub/18 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1017/viewcontent/Fritz_QR_2007_Quat_glaciation__DC_VERSION_FIX_TABLE3__optimize.pdf Papers in the Earth and Atmospheric Sciences paleoclimate Lake Titicaca Andes Altiplano Bolivia Peru South America quaternary diatoms isotopes glaciation Earth Sciences text 2007 ftunivnebraskali 2023-10-30T10:22:06Z A 136-m-long drill core of sediments was recovered from tropical high-altitude Lake Titicaca, Bolivia-Peru, enabling a reconstruction of past climate that spans four cycles of regional glacial advance and retreat and that is estimated to extend continuously over the last 370,000 yr. Within the errors of the age model, the periods of regional glacial advance and retreat are concordant respectively with global glacial and interglacial stages. Periods of ice advance in the southern tropical Andes generally were periods of positive water balance, as evidenced by deeper and fresher conditions in Lake Titicaca. Conversely, reduced glaciation occurred during periods of negative water balance and shallow closed basin conditions in the lake. The apparent coincidence of positive water balance of Lake Titicaca and glacial growth in the adjacent Andes with Northern Hemisphere ice sheet expansion implies that regional water balance and glacial mass balance are strongly influenced by global-scale temperature changes, as well as by precessional forcing of the South American summer monsoon. This version includes the corrected Table 3, as detailed in QR 69 (2008), p. 342, "Corrigendum." Text Ice Sheet University of Nebraska-Lincoln: DigitalCommons@UNL |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
paleoclimate Lake Titicaca Andes Altiplano Bolivia Peru South America quaternary diatoms isotopes glaciation Earth Sciences |
spellingShingle |
paleoclimate Lake Titicaca Andes Altiplano Bolivia Peru South America quaternary diatoms isotopes glaciation Earth Sciences Fritz, Sherilyn C. Baker, Paul A. Seltzer, Geoffrey O. Ballantyne, Ashley Tapia, Pedro Cheng, Hai Edwards, R. Lawrence Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project |
topic_facet |
paleoclimate Lake Titicaca Andes Altiplano Bolivia Peru South America quaternary diatoms isotopes glaciation Earth Sciences |
description |
A 136-m-long drill core of sediments was recovered from tropical high-altitude Lake Titicaca, Bolivia-Peru, enabling a reconstruction of past climate that spans four cycles of regional glacial advance and retreat and that is estimated to extend continuously over the last 370,000 yr. Within the errors of the age model, the periods of regional glacial advance and retreat are concordant respectively with global glacial and interglacial stages. Periods of ice advance in the southern tropical Andes generally were periods of positive water balance, as evidenced by deeper and fresher conditions in Lake Titicaca. Conversely, reduced glaciation occurred during periods of negative water balance and shallow closed basin conditions in the lake. The apparent coincidence of positive water balance of Lake Titicaca and glacial growth in the adjacent Andes with Northern Hemisphere ice sheet expansion implies that regional water balance and glacial mass balance are strongly influenced by global-scale temperature changes, as well as by precessional forcing of the South American summer monsoon. This version includes the corrected Table 3, as detailed in QR 69 (2008), p. 342, "Corrigendum." |
format |
Text |
author |
Fritz, Sherilyn C. Baker, Paul A. Seltzer, Geoffrey O. Ballantyne, Ashley Tapia, Pedro Cheng, Hai Edwards, R. Lawrence |
author_facet |
Fritz, Sherilyn C. Baker, Paul A. Seltzer, Geoffrey O. Ballantyne, Ashley Tapia, Pedro Cheng, Hai Edwards, R. Lawrence |
author_sort |
Fritz, Sherilyn C. |
title |
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project |
title_short |
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project |
title_full |
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project |
title_fullStr |
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project |
title_full_unstemmed |
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling project |
title_sort |
quaternary glaciation and hydrologic variation in the south american tropics as reconstructed from the lake titicaca drilling project |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2007 |
url |
https://digitalcommons.unl.edu/geosciencefacpub/18 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1017/viewcontent/Fritz_QR_2007_Quat_glaciation__DC_VERSION_FIX_TABLE3__optimize.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Papers in the Earth and Atmospheric Sciences |
op_relation |
https://digitalcommons.unl.edu/geosciencefacpub/18 https://digitalcommons.unl.edu/context/geosciencefacpub/article/1017/viewcontent/Fritz_QR_2007_Quat_glaciation__DC_VERSION_FIX_TABLE3__optimize.pdf |
_version_ |
1782335351288758272 |