title: East African megadroughts between 135 and 75 thousand years ago and bearing on early-modern human origins.
abstract: The environmental backdrop to the evolution and spread of early Homo sapiens in East Africa is known mainly from isolated outcrops and distant marine sediment cores. Here we present results from new scientific drill cores from Lake Malawi, the first long and continuous, high-fidelity records of tropical climate change from the continent itself. Our record shows periods of severe aridity between 135 and 75 thousand years (kyr) ago, when the lake's water volume was reduced by at least 95%. Surprisingly, these intervals of pronounced tropical African aridity in the early late-Pleistocene were much more severe than the Last Glacial Maximum (LGM), the period previously recognized as one of the most arid of the Quaternary. From these cores and from records from Lakes Tanganyika (East Africa) and Bosumtwi (West Africa), we document a major rise in water levels and a shift to more humid conditions over much of tropical Africa after approximately 70 kyr ago. This transition to wetter, more stable conditions coincides with diminished orbital eccentricity, and a reduction in precession-dominated climatic extremes. The observed climate mode switch to decreased environmental variability is consistent with terrestrial and marine records from in and around tropical Africa, but our records provide evidence for dramatically wetter conditions after 70 kyr ago. Such climate change may have stimulated the expansion and migrations of early modern human populations.
authors.affiliation: Department of Earth Sciences, 204 Heroy Geology Laboratory, Syracuse University, Syracuse, NY 13244, USA. cascholz@syr.edu
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Scholz
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Johnson
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Cohen
authors.forename: John W
authors.initials: JW
authors.lastname: King
authors.forename: John A
authors.initials: JA
authors.lastname: Peck
authors.forename: Jonathan T
authors.initials: JT
authors.lastname: Overpeck
authors.forename: Michael R
authors.initials: MR
authors.lastname: Talbot
authors.forename: Erik T
authors.initials: ET
authors.lastname: Brown
authors.forename: Leonard
authors.initials: L
authors.lastname: Kalindekafe
authors.forename: Philip Y O
authors.initials: PY
authors.lastname: Amoako
authors.forename: Robert P
authors.initials: RP
authors.lastname: Lyons
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Shanahan
authors.forename: Isla S
authors.initials: IS
authors.lastname: Castañeda
authors.forename: Clifford W
authors.initials: CW
authors.lastname: Heil
authors.forename: Steven L
authors.initials: SL
authors.lastname: Forman
authors.forename: Lanny R
authors.initials: LR
authors.lastname: McHargue
authors.forename: Kristina R
authors.initials: KR
authors.lastname: Beuning
authors.forename: Jeanette
authors.initials: J
authors.lastname: Gomez
authors.forename: James
authors.initials: J
authors.lastname: Pierson
mesh_terms: D000351:Africa, Eastern; D000818:Animals; D005075:Biological Evolution; D004190:Disasters; D015186:Hominidae / Q000254:growth & development*; D006801:Humans; D010163:Paleontology; D011153:Population; D014329:Tropical Climate