DOI: 10.1016/j.quascirev.2013.03.017
Scopus记录号: 2-s2.0-84877144313
论文题名: Middle and Late Pleistocene humid periods recorded in palaeolake deposits of the Nafud desert, Saudi Arabia
作者: Rosenberg T.M. ; Preusser F. ; Risberg J. ; Plikk A. ; Kadi K.A. ; Matter A. ; Fleitmann D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 70 起始页码: 109
结束页码: 123
语种: 英语
英文关键词: Arabia
; Diatoms
; Monsoon
; OSL
; Palaeolakes
; Pleistocene
; TT-OSL
Scopus关键词: Arabia
; Diatoms
; Monsoon
; OSL
; Palaeolakes
; Pleistocene
; TT-OSL
; Atmospheric thermodynamics
; Deposits
; Lakes
; Landforms
; Moisture
; Sedimentology
; Climate change
; climate variation
; humid environment
; lacustrine deposit
; luminescence
; paleoclimate
; paleolimnology
; Pleistocene
; radiocarbon dating
; wind direction
; zonal flow
; Nefud
; Saudi Arabia
; Bacillariophyta
英文摘要: Present climate in the Nafud desert of northern Saudi Arabia is hyper-arid and moisture brought by north-westerly winds scarcely reaches the region. The existence of abundant palaeolake sediments provides evidence for a considerably wetter climate in the past. However, the existing chronological framework of these deposits is solely based on radiocarbon dating of questionable reliability, due to potential post-depositional contamination with younger 14C. By using luminescence dating, we show that the lake deposits were not formed between 40 and 20ka as suggested previously, but approximately ca 410ka, 320ka, 200ka, 125ka, and 100ka ago. All of these humid phases are in good agreement with those recorded in lake sediments and speleothems from southern Arabia. Surprisingly, no Holocene lake deposits were identified. Geological characteristics of the deposits and diatom analysis suggest that a single, perennial lake covered the entire south-western Nafud ca 320ka ago. In contrast, lakes of the 200ka, 125ka, and 100ka humid intervals were smaller and restricted to interdune depressions of a pre-existing dune relief. The concurrent occurrence of humid phases in the Nafud, southern Arabia and the eastern Mediterranean suggests that moisture in northern Arabia originated either from the Mediterranean due to more frequent frontal depression systems or from stronger Indian monsoon circulation, respectively. However, based on previously published climate model simulations and palaecolimate evidence from central Arabia and the Negev desert, we argue that humid climate conditions in the Nafud were probably caused by a stronger African monsoon and a distinct change in zonal atmospheric circulation. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60634
Appears in Collections: 过去全球变化的重建
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作者单位: Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland; Department of Physical Geography and Quaternary Geology, Stockholm University, 10691 Stockholm, Sweden; Saudi Geological Survey, Jeddah 21514, Saudi Arabia; Department of Archaeology, School of Human and Environmental Sciences, University of Reading, Whiteknights, PO Box 227, Reading RG6 6AB, United Kingdom
Recommended Citation:
Rosenberg T.M.,Preusser F.,Risberg J.,et al. Middle and Late Pleistocene humid periods recorded in palaeolake deposits of the Nafud desert, Saudi Arabia[J]. Quaternary Science Reviews,2013-01-01,70