收藏本站
收藏 | 手机打开
二维码
手机客户端打开本文

Late Neogene evolution of the East Asian monsoon revealed by terrestrial mollusk record in Western Chinese Loess Plateau:From winter to summer dominated sub-regime

Denis-Didier Rousseau  
【摘要】:正More and more evidence indicates that the onset of the East Asian(EA) monsoon can be traced back to the Oligocene-Miocene boundary(at about 23 Ma).However,the process of its evolution is still less well-known until now.Here we investigate its late Neogene evolution by analyzing a terrestrial mollusk sequence,from the Chinese Loess Plateau(CLP),covering the period between 7.1 and 3.5 Ma.Considering the modern ecological requirements of these organisms,we were able to define two groups of cold-aridiphilous(CA) and thermo-humidiphilous(TH) species,representing the EA winter and summer monsoon variations, respectively,as previously defined in the Quaternary glacial-interglacial cycles.Variations in these two groups indicate two different monsoon dominated periods during 7.1-3.5 Ma.First,between 7.1 and 5.5 Ma, the EA winter monsoon,with a 100-kyr periodicity,was dominant.Second,between 5.1 and 4 Ma,the EA summer monsoon dominated,with a 41-kyr periodicity.Furthermore,our mollusk record yields valuable evidence for a late Miocene-Pliocene transition of about 400 kyr from winter monsoon dominated towards summer monsoon dominated,associated with a periodicity transition from weak 100 kyr to 41 kyr.The strengthened winter monsoon interval,with a 100-kyr periodicity,is coeval with orbital-scale global icevolume changes,in conjunction with the uplift of the Tibetan Plateau which probably reinforced the winter monsoon sub-regime.Conversely,closures of the Panama and Indonesian seaways,associated with changes in obliquity between 5.1 and 4 Ma,are probably major forcing factors for the observed dominant summer monsoon with 41-kyr frequency,favoring heat and moisture transports between low and high latitudes to allow TH mollusks to grow and develop in the CLP.

知网文化
【相似文献】
中国重要会议论文全文数据库 前10条
1 ;A 20 Ma pollen record of East-Asian summer monsoon evolution from Guyuan,Ningxia,China[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
2 Denis-Didier Rousseau;;Late Neogene evolution of the East Asian monsoon revealed by terrestrial mollusk record in Western Chinese Loess Plateau:From winter to summer dominated sub-regime[A];中国科学院地质与地球物理研究所2008学术论文汇编[C];2009年
3 ;Holocene East Asian monsoon variation inferred from species assemblage and shell chemistry of the ostracodes from Hulun Lake,Inner Mongolia[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(中)[C];2012年
4 ;Terrestrial mollusc records from Xifeng and Luochuan L9 loess strata and their implications for paleoclimatic evolution in the Chinese Loess Plateau during marine Oxygen Isotope Stages 24-22[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(中)[C];2012年
5 ;Pollen-inferred climate changes and vertical shifts of alpine vegetation belts on the northern slope of the Nyainqentanglha Mountains(central Tibetan Plateau) since 8.4 kyr BP[A];中国科学院地质与地球物理研究所第11届(2011年度)学术年会论文集(中)[C];2012年
6 Nashendelger;;Seasonal home range shift and dispersal of red deer at Saihanwula Biosphere Reserve,China[A];第七届全国野生动物生态与资源保护学术研讨会论文摘要集[C];2011年
7 ;A new record species of epiphytic marine green algae,Entocladia leptochaete(Chaetophoraceae,Chlorophyta) with its primary experimental biology from China[A];庆祝中国藻类学会成立30周年暨第十五次学术讨论会摘要集[C];2009年
8 Denis-Didier Rousseau;;Wind-blown origin of Dongwan late Miocene-Pliocene dust sequence documented by land snail record in western Chinese Loess Plateau[A];中国科学院地质与地球物理研究所2006年论文摘要集[C];2007年
9 T.M.Kharpukhaeva;;俄罗斯Buryatia和蒙古的松萝属研究(梅衣科)(英文)[A];Abstracts of International Symposium on Systematic Lichenology & Bryology[C];2010年
10 ;The molecular mechanism of thermo-tolerance in Arabidopsis pollen tubes and thermo-sensitive male sterility[A];第六届中国植物逆境生理学与分子生物学学术研讨会论文摘要汇编[C];2010年
 快捷付款方式  订购知网充值卡  订购热线  帮助中心
  • 400-819-9993
  • 010-62982499
  • 010-62783978