A new estimate of the Holocene lowstand level of Lake Titicaca, central Andes, and implications for tropical palaeohydrology

Holocene - Tập 10 Số 1 - Trang 21-32 - 2000
Scott Cross1, Paul A. Baker2, Geoffrey O. Seltzer3, Sherilyn C. Fritz4, Robert B. Dunbar5
1Duke University
2Division of Earth and Ocean Sciences, Duke University, Durham, NC, USA
3Department of Earth Sciences, Syracuse University, Syracuse, NY, USA
4Department of Geosciences, University of Nebraska, Lincoln, NE, USA
5Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, USA

Tóm tắt

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 3.8 14C 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.

Từ khóa


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Thông tin
Thông tin xuất bản

Holocene

Tập 10 Số 1

21-32

Thông tin tác giả