A high-resolution paleoclimate record spanning the past 25,000 years in southern East Africa.
High-resolution profiles of the mass accumulation rate of biogenic silica and other geochemical proxies in two piston cores from northern Lake Malawi provide a climate signal for this part of tropical Africa spanning the past 25,000 years. The biogenic silica mass accumulation rate was low during the relatively dry late Pleistocene, when the river flux of silica to the lake was suppressed. Millennial-scale fluctuations, due to upwelling intensity, in the late Pleistocene climate of the Lake Malawi basin appear to have been closely linked to the Northern Hemisphere climate until 11 thousand years ago. Relatively cold conditions in the Northern Hemisphere coincided with more frequent north winds over the Malawi basin, perhaps resulting from a more southward migration of the Intertropical Convergence Zone.
Johnson
Thomas C
TC
Large Lakes Observatory, University of Minnesota Duluth, Duluth, MN 55812, USA. tcj@d.umn.edu
Brown
Erik T
ET
McManus
James
J
Barry
Sylvia
S
Barker
Philip
P
Gasse
François
F
D000351:Africa, Eastern; D001272:Atmosphere; D017377:Diatoms / Q000254:growth & development; D017753:Ecosystem; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D010839:Phytoplankton / Q000254:growth & development; D011891:Rain; D012822:Silicon Dioxide / Q000032:analysis*; D013995:Time; D014329:Tropical Climate; D018707:Volcanic Eruptions; D014919:Wind
D012822:Silicon Dioxide