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A new estimate of the Holocene lowstand level of Lake Titicaca, central Andes, and implications for tropical palaeohydrology
- Source :
- The Holocene. 10:21-32
- Publication Year :
- 2000
- Publisher :
- SAGE Publications, 2000.
-
Abstract
- New evidence from piston cores and high-resolution seismic reflection data shows that water levels in Lake Titicaca were as much as 100 m below the present level during the early to mid-Holocene (between .6 and 3.814C kyr BP). Climatological and modelling studies indicate that Lake Titicaca rainfall depends on convective activity in upwind Amazonia; the lake-level data therefore suggest a drier Amazon Basin during this time. This view is bolstered by an excellent match between the Titicaca lake-level curve and decreased methane concentrations in Greenland ice, previously ascribed to drying of low-latitude wetlands (Blunier et al., 1995). The postglacial history of Lake Titicaca fits a global pattern of lake-level change in the tropics, characterized by opposite phasing between the Southern and Northern Hemispheres. This pattern is most likely the result of orbital controls over the intensity of summer insolation.
- Subjects :
- 010506 paleontology
Archeology
Global and Planetary Change
geography
geography.geographical_feature_category
010504 meteorology & atmospheric sciences
Ecology
Amazon rainforest
Paleontology
Tropics
Wetland
01 natural sciences
law.invention
law
Climatology
Paleoclimatology
Radiocarbon dating
Hydrography
Surface water
Holocene
Geology
0105 earth and related environmental sciences
Earth-Surface Processes
Subjects
Details
- ISSN :
- 14770911 and 09596836
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- The Holocene
- Accession number :
- edsair.doi...........c7f0cf429fc86c6677456f2265848ab7