| PALEOLIMNOLOGY |
Quaternary glaciation and hydrologic variation in the South American tropics as reconstructed from the Lake Titicaca drilling
project.
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Fritz, S.C.,Baker, P.A.,Seltzer, G.O.,Ballantyne, A.,Tapia, P.,Cheng, H.,Edwards, R.L. 2007 Quaternary glaciation and hydrologic
variation in the South American tropics as reconstructed from the Lake Titicaca drilling project. Quaternary Research Vol.
68, pp. 410¿420.
| Data Coverage |
North: -15.93 * South: -15.93 |
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West: -69.25 * East: -69.25 |
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Altitude: 3810 m |
Start Year: 371950 cal yr BP * End Year: -50 cal yr BP
Data: Please Cite Data Contributors!
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Summary: 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.
More Info on Paleolimnology |
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Complete XML Record: noaa-lake-6069
(Last Revised: 2009-02-11 )
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| http://www.ncdc.noaa.gov/paleo/ |
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