DOI: 10.1016/j.palaeo.2015.02.005
论文题名: Northeast African temperature variability since the Late Pleistocene
作者: Loomis S.E. ; Russell J.M. ; Lamb H.F.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 423 起始页码: 80
结束页码: 90
语种: 英语
英文关键词: East Africa
; GDGT
; Holocene
; Lake Tana
; Paleotemperature
; Tropical paleoclimate
英文摘要: The development and application of lacustrine paleotemperature proxies based on microbial membrane lipid structures, including the TEX86 and branched glycerol dialkyl glycerol tetraether (brGDGT) paleothermometers, have greatly advanced our understanding of the late-glacial and postglacial temperature history of Africa. However, the currently available records are from equatorial and southern hemisphere sites, limiting our understanding of the spatial patterns of temperature change. Here we use the brGDGT paleotemperature proxy to reconstruct Late Pleistocene and Holocene temperatures from Lake Tana, Ethiopia (12°N, 37°E). Following the termination of Heinrich Stadial 1 at ~15ka, Lake Tana experienced a 3.7°C oscillation over 1.2ky. Temperatures then increased abruptly by nearly 7°C between 13.8 and 13.0ka, followed by a slow warming trend that peaked during the mid Holocene. Temperatures subsequently cooled from ~6ka to ~0.4ka. These data indicate that temperature at Lake Tana was sensitive to climate changes caused by variations in the Atlantic Meridional Overturning Circulation during the Late Pleistocene, as well as to regional hydroclimatic changes and reorganizations of the monsoons. Our record suggests that late-glacial temperature changes in northeast Africa were linked to high-latitude northern hemispheric climate processes, but that subsequent post-glacial temperature variations were strongly influenced by tropical hydrology. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69008
Appears in Collections: 过去全球变化的重建
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作者单位: Brown University, Department of Earth, Environmental and Planetary Sciences, 324 Brook St., Box 1846, Providence, RI, United States; Aberystwyth University, Department of Geography and Earth Sciences, Aberystwyth, United Kingdom
Recommended Citation:
Loomis S.E.,Russell J.M.,Lamb H.F.. Northeast African temperature variability since the Late Pleistocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,423