通过对获取的巢湖湖泊沉积岩芯的磁化率与粒度组合特征的分析，结合孢粉及相邻其它区域的环境考古资料，得出该岩芯柱样所反映的环境变化信息。结果表明：（1）巢湖湖泊沉积物磁化率曲线在117cm以下总体上比较平稳而略有下降，117cm以...通过对获取的巢湖湖泊沉积岩芯的磁化率与粒度组合特征的分析，结合孢粉及相邻其它区域的环境考古资料，得出该岩芯柱样所反映的环境变化信息。结果表明：（1）巢湖湖泊沉积物磁化率曲线在117cm以下总体上比较平稳而略有下降，117cm以上人类活动所导致的侵蚀作用加剧使得磁化率值异常升高；（2）本岩芯柱样117cm以下样品的磁化率强度与粘土的百分比含量呈正相关，而与粉砂组分的百分比含量成负相关；（3）根据磁化率与粒度组合变化特征，结合孢粉分析及全新世以来区域气候变化背景，9870 Cal a B．P．以来的巢湖流域古气候环境演变可以划分6个不同的时期：9870～7000 Cal a B．P．，气候呈温和略干的特点；7000～4750 Cal a B．P．，气候温暖湿润；4750～2170 Cal a B．P．，流域气候温和干燥，巢湖湖盆局部地区可能出露水面以上；2170～1040 Cal a B．P．，气候总体上温和湿润，但是冷暖波动明显；1040～200 Cal a B．P．流域处在温凉稍湿的时期，人类活动逐渐加强；200 Cal a B．P．至今，流域总体上处于相对温暖湿润阶段。展开更多
As one of the most important geological events in Cenozoic era,the uplift of the Tibetan Plateau(TP)has had profound influences on the Asian and global climate and environment evolution.During the past four decades,ma...As one of the most important geological events in Cenozoic era,the uplift of the Tibetan Plateau(TP)has had profound influences on the Asian and global climate and environment evolution.During the past four decades,many scholars from China and abroad have studied climatic and environmental effects of the TP uplift by using a variety of geological records and paleoclimate numerical simulations.The existing research results enrich our understanding of the mechanisms of Asian monsoon changes and interior aridification,but so far there are still a lot of issues that need to be thought deeply and investigated further.This paper attempts to review the research on the influence of the TP uplift on the Asian monsoon-arid environment,summarize three types of numerical simulations including bulk-plateau uplift,phased uplift and sub-regional uplift,and especially to analyze regional differences in responses of climate and environment to different forms of tectonic uplifts.From previous modeling results,the land-sea distribution and the Himalayan uplift may have a large effect in the establishment and development of the South Asian monsoon.However,the formation and evolution of the monsoon in northern East Asia,the intensified dryness north of the TP and enhanced Asian dust cycle may be more closely related to the uplift of the main body,especially the northern part of the TP.In this review,we also discuss relative roles of the TP uplift and other impact factors,origins of the South Asian monsoon and East Asian monsoon,feedback effects and nonlinear responses of climatic and environmental changes to the plateau uplift.Finally,we make comparisons between numerical simulations and geological records,discuss their uncertainties,and highlight some problems worthy of further studying.展开更多
文摘通过对获取的巢湖湖泊沉积岩芯的磁化率与粒度组合特征的分析，结合孢粉及相邻其它区域的环境考古资料，得出该岩芯柱样所反映的环境变化信息。结果表明：（1）巢湖湖泊沉积物磁化率曲线在117cm以下总体上比较平稳而略有下降，117cm以上人类活动所导致的侵蚀作用加剧使得磁化率值异常升高；（2）本岩芯柱样117cm以下样品的磁化率强度与粘土的百分比含量呈正相关，而与粉砂组分的百分比含量成负相关；（3）根据磁化率与粒度组合变化特征，结合孢粉分析及全新世以来区域气候变化背景，9870 Cal a B．P．以来的巢湖流域古气候环境演变可以划分6个不同的时期：9870～7000 Cal a B．P．，气候呈温和略干的特点；7000～4750 Cal a B．P．，气候温暖湿润；4750～2170 Cal a B．P．，流域气候温和干燥，巢湖湖盆局部地区可能出露水面以上；2170～1040 Cal a B．P．，气候总体上温和湿润，但是冷暖波动明显；1040～200 Cal a B．P．流域处在温凉稍湿的时期，人类活动逐渐加强；200 Cal a B．P．至今，流域总体上处于相对温暖湿润阶段。
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB03020601)the National Basic Research Program of China(2010CB833406)the National Natural Science Foundation of China(41290255 and 41075067)
文摘As one of the most important geological events in Cenozoic era,the uplift of the Tibetan Plateau(TP)has had profound influences on the Asian and global climate and environment evolution.During the past four decades,many scholars from China and abroad have studied climatic and environmental effects of the TP uplift by using a variety of geological records and paleoclimate numerical simulations.The existing research results enrich our understanding of the mechanisms of Asian monsoon changes and interior aridification,but so far there are still a lot of issues that need to be thought deeply and investigated further.This paper attempts to review the research on the influence of the TP uplift on the Asian monsoon-arid environment,summarize three types of numerical simulations including bulk-plateau uplift,phased uplift and sub-regional uplift,and especially to analyze regional differences in responses of climate and environment to different forms of tectonic uplifts.From previous modeling results,the land-sea distribution and the Himalayan uplift may have a large effect in the establishment and development of the South Asian monsoon.However,the formation and evolution of the monsoon in northern East Asia,the intensified dryness north of the TP and enhanced Asian dust cycle may be more closely related to the uplift of the main body,especially the northern part of the TP.In this review,we also discuss relative roles of the TP uplift and other impact factors,origins of the South Asian monsoon and East Asian monsoon,feedback effects and nonlinear responses of climatic and environmental changes to the plateau uplift.Finally,we make comparisons between numerical simulations and geological records,discuss their uncertainties,and highlight some problems worthy of further studying.
