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11 条 记 录,以下是 1-10
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中更新世以来西菲律宾海上层水体结构演化特征——来自钙质超微化石Florisphaera profunda的证据被引量:6
2011年
MD06-3050岩芯位于西菲律宾海吕宋岛以东本哈姆高原,利用钙质超微化石下透光带种属Florisphaera profunda占总颗石的相对丰度,恢复了中更新世以珲该海区的上层水体结构演化特征。结果显示,西菲律宾海区自1040ka以来,温跃层/营养跃层经历了由浅—深—浅—深的长周期变动,可能是由于全球碳库的长周期变化对气候系统的大规模调整所致;同时温跃层/营养跃层也具有明显的冰期-间冰期旋回性特征。温跃层变动的另一个重要特征是在中布容事件前后呈现出相反的冰期-间冰期变化趋势,认为可能是由东亚冬、夏季风强度变化引起。
孙晗杰李铁刚苏翔孙荣涛于心科常凤鸣唐正
关键词:西菲律宾海中更新世长周期东亚季风
西北太平洋MD06-3054孔浮游有孔虫表层海水温度估算
2011年
在古海洋学研究中,常用浮游有孔虫来恢复表层海水温度(SST),然而基于浮游有孔虫恢复SST的这些方法之间存在一定的差异。为了说明各方法的特点,在浮游有孔虫鉴定和浮游有孔虫表层种Globigerinoides ruberMg/Ca比值测试的基础上,分别利用转换函数FP12-E,现代类比(Modern Analog Technique,MAT)和Mg/Ca比值法对西北太平洋北赤道流分叉处MD06-3054孔中记录的末次冰期以来的SST进行了估算。分析发现:(1)转换函数FP12-E不适用于该孔;(2)该孔中MAT法估算的末次冰期到冰后期SST的变化小于Mg/Ca比值法得到的结果;(3)考虑到浮游有孔虫产量的季节变化,Mg/Ca比值法得到的SSTMg/Ca末次冰期到冰后期的变化可能偏大。尽管如此,相对于MAT等古生态学方法,Mg/Ca比值法受到的影响因素更少,若能对浮游有孔虫的季节产量等方面加以校正,将会得到更准确的结果。
陈双喜李铁刚南青云唐正仇晓华
关键词:浮游有孔虫转换函数
Sediment provenance discrimination in northern Okinawa Trough during the last 24 ka and paleoenvironmental implication:rare earth elements evidence被引量:12
2012年
Rare earth elements (REE) compositions and discriminant function were successfully used to examine high resolution sediment source changes in the northern Okinawa Trough over the last 24.1 ka, especially for the influence from the Yellow River and the Tsushima Warm Current (TWC) that has not been well solved. Variations of these parameters were clearly divided into three distinct depositional units. During Interval 1 (24.1-16.0 ka BP), the paleo-Yellow River and the paleo-Yangtze River mouths were situated near the studied area and could have played major roles in the sedimentation therein. In Interval 2 (16.0-7.3 ka BP), these river mouths gradually retreated with global sea-level rise, leading to less fluvial inputs from them to the northern Okinawa Trough. Meanwhile, formation of the TWC could carry some sediment loads of Taiwan to the studied core, especially during its late phase (8.0-7.3 ka BP). Modem oceanographic conditions, with a predominance of the TWC, were finally established since the beginning of Interval 3, causing more ten'igenous contribution from Taiwan to the studied area. Subsequently, modem depositional environments mainly influenced by the Yellow River, the Yangtze River, and the TWC were finally formed.
徐兆凯李铁刚常凤鸣CHOI JinyongLIM Dhongil徐方建
Correspondence between the ENSO-like state and glacial- interglacial condition during the past 360 kyr被引量:2
2017年
In the warming world, tropical Pacific sea surface temperature (SST) variation has received considerable attention because of its enormous influence on global climate change, particularly the El Nino-Southern Oscillation process. Here, we provide new high-resolution proxy records of the magnesium/ calcium ratio and the oxygen isotope in foraminifera from a core on the Ontong-Java Plateau to reconstruct the SST and hydrological variation in the center of the Western Pacific Warm Pool (WPWP) over the last 360 000 years. In comparison with other Mg/Ca-derived SST and δ18O records, the results suggested that in a relatively stable condition, e.g., the last glacial maximum (LGM) and other glacial periods, the tropical Pacific would adopt a La Nifia-like state, and the Walker and Hadley cycles would be synchronously enhanced. Conversely, El Nino-like conditions could have occurred in the tropical Pacific during fast- changing periods, e.g., the termination and rapidly cooling stages of interglacial periods. In the light of the sensitivity of the Eastern Pacific Cold Tongue (EPCT) and the inertia of the WPWP, we hypothesize an inter-restricted relationship between the WPWP and EPCT, which could control the zonal gradient variation of SST and affect climate change.
张帅李铁刚常凤鸣俞宙菲熊志方王海霞
Sea surface temperature and salinity reconstruction based on stable isotopes and Mg/Ca of planktonic foraminifera in the western Pacific Warm Pool during the last 155 ka被引量:4
2014年
Changes in sea surface temperature (SST), seawater oxygen isotope (δ18Osw), and local salinity proxy (δ18Osw-ss ) in the past 155 ka were studied using a sediment core (MD06-3052) from the northern edge of the western Pacific Warm Pool (WPWP), within the flow path of the bifurcation of the North Equatorial Current. Our records reveal a lead-lag relationship between paired Mg/Ca-SST and δ18O during Termination II and the last interglacial period. Similarity in SST between our site and the Antarctic temperature proxy and in CO2 profile showed a close connection between the WPWP and the Antarctic. Values of 818Osw exhibited very similar variations to those of mean ocean δ18Osw, owing to the past sea-level changes on glacial-interglacial timescale. Calculated values of δ18O reflect a more saline condition during high local summer insolation (SI) periods. Such correspondence between δ18O and local SI in the WPWP may reflect complex interaction between ENSO and monsoon, which was stimulated by changes in solar irradiance and their influence on the local hydrologic cycle. This then caused a striking reorganization of atmospheric circulation over the WPWP.
仇晓华李铁刚常凤鸣南青云熊志方孙晗杰
关键词:MG/CAMONSOON
Response of the northwestern Pacific upper water δ^(13)C to the last deglacial ventilation of the deep Southern Ocean被引量:5
2011年
The deglacial δ~13C minimum events that originated from the ventilation of the deep Southern Ocean around Antarctica, have been recorded in a range of marine sediments from the southern to tropical oceans in late Pleistocene. However, the broad δ~13C minimum event was also reported as far as to the northern middle latitudes, in northwestern Pacific marginal sea areas, during the last deglaciation. In the northwestern Pacific, forcing from the northern high latitudes is strongly expressed, while the records of in- fluence from the southern high latitudes are few. The Kuroshio Source Region (KSR) forms a boundary between the northwestern Pacific and the southern, tropical Pacific. So, high-resolution planktonic foraminiferal records in core MD06-3054 from the KSR are well positioned to identify signals from the southern hemisphere in the northwestern Pacific. Planktonic foraminiferal tests from the upper 1030 cm of the core were subject to AMS14C, carbon and oxygen isotopic measurements. A negative excursion was found to occur from about 20.0-6.0 ka BP in δ~13C records of both surface (Globigerinoides ruber) and subsurface (Pulleni- atina obliquiloculata) dwellers, but the overall trends of the two curves have reversed since 26.5 ka BP. Moreover, the δ~13C rec- ord of G. ruber (the surface dweller) shows a robust link to the record of atmospheric CO2, and its changes precede the records of P. obliquiloculata (the subsurface dweller). According to the hydrologic conditions, the broad δ~13C minimum event recorded in the KSR is also a response to the increasing ventilation of the deep Southern Ocean around Antarctica during the last deglaciation. The inconsistency between the records of the surface and subsurface dwellers was possibly caused by the ways that the low δ~13C signal was transmitted. Subsurface water primarily received the low δ~13C signal from the Antarctic Intermediate Water (AAIW), whereas the surface water was probably mainly impacted by atmospheric CO2 in the KSR. The records from the KSR confi
CHEN ShuangXiLI TieGangTANG ZhengQIU XiaoHuaXIONG ZhiFangNAN QingYunXU ZhaoKaiCHANG FengMing
关键词:南大洋信号传输方式末次冰消期中纬度地区
高有机质输入对底栖有孔虫的抑制作用--以西北太平洋菲律宾海MD06-3054孔为例被引量:3
2011年
底栖有孔虫古生产力指标—底栖有孔虫堆积速率(Benthic Foraminiiera Accumulation Rate,简称BFAR)和小泡虫超科的Uvigetina与Bulimina两属在种群中的百分含量(简称"U+B含量")是目前古海洋学研究的常用方法。然而,从MD06-3054孔的记录中发现,两指标与有机质输入之间不仅不存在很好的线性关系。而且当有机质输入大于阀值时,两指标均随沉积物中总有机碳(Total Organic Carbon,简称TOC)含量的增加而明显地降低,说明过高有机质的输入还会抑制底栖有孔虫的生长和繁盛。另外,还发现当TOC含量较高时,U+B含量指标较BFAR指标相对更适用。
陈双喜南青云李铁刚唐正仇晓华
关键词:底栖有孔虫古生产力
西太平洋暖池区古海洋学研究被引量:7
2013年
热带西太平洋对现代全球气候系统有举足轻重的影响,其中"西太平洋暖池"区的变异对调节全球气候发挥着极为重要的作用。越来越多的证据表明在轨道—亚轨道尺度上暖池对全球古气候的变化也有着重要的调控作用,低纬热带西太平洋已成为近十几年来古海洋学研究的重点地区之一。从表层海水古温度和古生产力记录、千年尺度的快速气候变化、厄尔尼诺—南方涛动(El Nio-Southern Oscillation,ENSO)式变化以及暖池强弱变动及其位移等角度梳理了西太平洋暖池区古海洋学研究的现状,综述了目前对暖池区海洋环境演化及其气候效应的已有认识,针对目前暖池区古环境研究的状况探讨了未来工作中应重视的科学问题。
常凤鸣李铁刚
关键词:西太平洋暖池古海洋学快速气候变化
西菲律宾海第四纪钙质超微化石及微玻陨石地层学被引量:4
2011年
对西菲律宾海MD06-3047和MD06-3050两个柱状样第四纪沉积物进行了钙质超微化石和微玻陨石分析.经过鉴定统计,识别出自2.36Ma以来的7个钙质超微化石地层学事件,分别是Discoaster brouweri的末现、Calcidiscus macintyrei的末现、Large Gephyrocapsa的初现、Large Gephyrocapsa的末现、Pseudoemiliania lacunosa的末现、Gephyrocapsa caribbeanica的快速增长、以及Emiliania huxleyi的初现.同时,在MD06-3050柱状样岩芯1340~1374cm层位发现大量微玻陨石.通过氧同位素年代曲线对比,得出这些钙质超微化石生物学事件和微玻陨石事件的年龄.
孙晗杰李铁刚孙荣涛于心科常凤鸣唐正
关键词:西菲律宾海第四纪钙质超微化石地层学微玻陨石
亚马逊冲积扇海域表层海水古盐度的定量重建
<正>河流输入是全球大洋海水溶解Ba的主要来源,淡水中Ba从粘土悬浮物的脱附作用使得河流输入水体富集Ba2+。河流输入淡水与海水在河口区混合时的粘土絮凝作用使得河口区的水体以高Ba2+和低盐为特征,而外海海域则为高盐、低...
常凤鸣王倩李铁刚
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