Distribution of GDGTs in lake surface sediments on the Tibetan Plateau and its influencing factors

来源 :Science China(Earth Sciences) | 被引量 : 0次 | 上传用户:carpplolo
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Quantitative paleotemperature records are vital not only for verifying and improving the accuracy of climate model simulations, but also for estimating the amplitude of temperature variability under global warming scenarios. The Tibetan Plateau(TP) affects atmospheric circulation patterns due to its unique geographical location and high elevation, and studies of the mechanisms of climate change on the TP are potentially extremely valuable for understanding the relationship of the region with the global climate system. With the development of biomarker-based proxies, it is possible to use lake sediments to quantitatively reconstruct past temperature variability. The source of Glycerol Dialkyl Glycerol Tetraethers(GDGTs) in lake sediments is complex, and their distribution is controlled by both climatic and environmental factors. In this work, we sampled the surface sediments of 27 lakes on the TP and in addition obtained surface soil samples from six of the lake catchments. We analyzed the factors that influence GDGT distribution in the lake sediments, and established quantitative relationship between GDGTs and Mean Annual Air Temperature(MAAT). Our principal findings are as follows: the majority of GDGTs in the lake sediments are b GDGTs, followed by crenarchaeol and GDGT-0. In most of the lakes there were no significant differences between the GDGT distribution within the lake sediments and the soils in the same catchment, which indicates that the contribution of terrestrial material is important. i GDGTs in lake sediments are mainly influenced by water chemistry parameters(p H and salinity), and that in small lakes on the TP, TEX_(86) may act as a potential proxy for lake p H; however, in contrast b GDGTs in the lake sediments are mainly controlled by climatic factors. Based on the GDGT distribution in the lake sediments, we used proxies(MBT, CBT) and the fractional abundance of b GDGTs(f_(abun)) to establish calibrations between GDGTs and MAAT, respectively, which potentially provide the basis for paleoclimatic reconstruction on the TP. Quantitative paleotemperature records are vital not only for verifying and improving the accuracy of climate model simulations, but also for estimating amplitude of temperature variability under global warming scenarios. The Tibetan Plateau (TP) elevation, and studies of the mechanisms of climate change on the TP are potentially extremely valuable for understanding the relationship of the region with the global climate system. With the development of biomarker-based proxies, it is possible to use lake sediments to quantitatively reconstruct past temperature variability. The source of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in lake sediments is complex, and their distribution is controlled by both climatic and environmental factors. In this work, we sampled the surface sediments of 27 lakes on the TP and in addition surface soil samples from six of the lake catchments. We analyzed the factors that influence GDGT distribution in the lake sediments, and established quantitative relationship between GDGTs and Mean Annual Air Temperature (MAAT). Our principal findings are as follows: the majority of GDGTs in the lake sediments are b GDGTs, followed by crenarchaeol and GDGT -0. Most of the lakes there were no significant differences between the lake sediments and the soils in the same catchment, which indicates that the contribution of terrestrial material is important. I GDGTs in lake sediments are primarily influenced by water chemistry parameters (p H and salinity), and that in small lakes on the TP, TEX (86) may act as a potential proxy for lake p H; however, in contrast b GDGTs in the lake sediments are mainly controlled by climatic factors. Based on the GDGT distribution in the lake sediments, we used proxies (MBT, CBT) and the fractional abundance of b GDGTs (f_ (abun)) to establish calibrations between GDGTs and MAAT, respectively, which potentially provide the basis for paleoclimatic reconstruction on the TP.
其他文献
当前高职院校职业价值观教育实施载体较为单一.要提高职业价值观教育的实效性,必须明确职业价值观教育的课程定位,加强教师队伍建设,发挥校园文化的熏陶作用,构筑学校、社会
一、临床资料共治疗肝炎后肝硬化患者65例,随机分为治疗组35例,对照组30例。治疗组中,男28例,女7例;年龄27~72岁,平均41.7岁;乙型肝炎29例,丙型肝炎6例;病程6~22年,平均8.6年
MicroRNA能够通过与靶mRNA特异性的碱基配对引起靶mRNA的降解或者翻译抑制,在细胞增殖、分化、凋亡、基因调控及疾病的发生,尤其是肿瘤中起着重要的作用。目前认为miRNA在肿
伤员,男,19岁,1994年9月8日15点50分,在医院内施工时在水中被380伏电击倒,昏迷,5分钟后抬入急诊室。检查:昏迷,瞳孔散大,呼吸浅弱,2~3次/分,心跳停止,血压测不到。立即进行胸
近十年来我所采用西药穴位注射与传统针刺结合治疗周围性面神经炎28例,临床观察疗效满意,报道如下。本组28例,男17例,女11例,右侧面神经炎19例,左侧9例。最大年龄59岁,最小1
肿瘤的高侵袭转移能力是多因素的,有原癌基因抑癌基因表达改变、基质金属蛋白酶的表达、血管新生以及黏附分子的作用有关之外,肿瘤细胞的无氧糖酵解途径也赋予肿瘤细胞的高浸
2015年底举行的中央经济工作会议对今年经济形势、稳增长重点、结构性改革战术任务、重要改革领域、惠民生要点和开放战略作出明确部署。看形势新常态下基本面向好但也面临困
鸡西矿业集团公司张辰煤矿西三采区3
期刊
即使安东尼·戴维斯因伤休息了半年多的时间(自从今年3月20号休战),即使他的球队已经离季后赛渐行渐远,但没人怀疑浓眉哥依旧是这个联盟的当今最强大前锋。新赛季开始后,戴维
迟姐听说羽众杯要在海淀区举行了,就四处打听如何报名参赛。经过了解,要么是海淀户口,要么在海淀工作,都可以以个人名义直接报名。打听清楚了,迟姐就来和我商量:“要不咱也报