High Resolution Studies of Late Quaternary Climate and Oceanographic Change, Santa Barbara Basin
圣巴巴拉盆地晚第四纪气候和海洋变化的高分辨率研究
基本信息
- 批准号:9509839
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing grant
- 财政年份:1995
- 资助国家:美国
- 起止时间:1995-08-01 至 1999-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
9529839 Kennett Funds are requested to conduct high resolution paleoclimatic and paleoceanographic investigations of Site 893 (588 m water depth), a late Quaternary sediment sequence (200 m thickness) of very high quality from Santa Barbara Basin, California. Initial chronological, oxygen isotopic and foraminiferal assemblage investigations reveal a complete to near-complete climate record representing near-linear sedimentation rates at ~15 cm/100 years for the last 160 kyrs. The sequence is well located to monitor changes in upwelled intermediate waters associated with changing modes of thermohaline circulation in the north Pacific. The sediment sequence records many oscillations between low oxygen conditions, represented by sediment laminations and low oxygen tolerant benthic foraminifers, and higher oxygen conditions, represented by non-laminated bioturbated sediments and oxygen-loving benthic forminifers. Our relatively detailed studies for the last 20 ky interval suggests close coincidence between switches in basinal ventilation and global climate changes as recorded by foraminiferal 18O and planktonic forminiferal assemblages. Oxygenated conditions prevailed during colder intervals (Younger Dryas and last glacial maximum). Conversely, suboxic conditions occurred during warmer intervals (Bolling/Allerod and Holocene), Radiocarbon age differences between planktonic and benthic foraminiferal pairs are smaller (av. 90 yrs) during cool intervals; larger (av. 470 yrs) during warm intervals. We have interpreted these oscillations in sediment facies and radiocarbon ages to reflect changes in intermediate waters with a greater proportion originating from a relatively proximal source during cooler intervals compared with a distal source during warmer intervals, including the present day. Our initial studies suggest an absence of any significant lags between the ventilation and climate changes during the last 20 kyrs. This suggest that a tight coupling existed between changes i n circulation influencing Santa Barbara Basin and climate. The Santa Barbara Basin sequence has been an inherently unstable environmental system that is highly sensitive to global climate change. We have also recently discovered that the sequence of laminated sediment intervals in Site 893 closely correlated with almost the entire sequence of glacial interstadials (Dansgaard-Oeschger events) as recorded in the Greenland ice sheet and indirectly in sediment sequences in the north Atlantic. We proposed to conduct studies to test several hypotheses: 1. that the changes in ventilation in Santa Barbara Basin are intimately linked with global climate change during the last 70 kyrs; 2. that the changes in ventilation during the last 70 kyrs were linked to the north Atlantic deep sea sediment record through changes in oceanic conveyor circulation, or through thermohaline changes in Pacific intermediate waters resulting from global climate change, or to both in unison; and 3. that climate during peak-warming of the last interglacial episode (substage 5e or Eemian; 125-115 ka) was sufficiently different from that of the Holocene to affect major change in Pacific thermohaline circulation at intermediate water depths that, in turn, caused fundamental changes in basinal environmental conditions that we record in Santa Barbara Basin.
9529839肯内特基金被要求对加利福尼亚州圣巴巴拉盆地晚第四纪沉积层序(水深588m)进行高分辨率古气候和古海洋调查。初步的年代学、氧同位素和有孔虫组合研究揭示了一个完整的到接近完整的气候记录,代表了过去160年来近15厘米/100年的近线性沉积速率。该序列的位置很好,可以监测与北太平洋温盐环流模式变化有关的上升中间水的变化。沉积物层序记录了以沉积物纹层和低耐氧底栖有孔虫为代表的低氧条件和以非层理生物扰动沉积物和喜氧底栖有孔虫为代表的高氧条件之间的多次振荡。我们对过去20Ky间隔的相对详细的研究表明,盆地通风的开关与全球气候变化之间存在密切的吻合,如有孔虫18O和浮游有孔虫组合所记录的那样。充氧条件在较冷的时段(较年轻的仙女木和最后一次冰川高峰期)占优势。相反,亚缺氧条件发生在较温暖的时期(Bolling/Allerod和全新世),浮游有孔虫和底栖有孔虫对之间的放射性碳年龄差异较小(av。90年);较大的(平均470年)在温暖的间歇期。我们对沉积相和放射性碳测年中的这些振荡进行了解释,以反映中间水域的变化,与温暖时期(包括今天)来自相对较近的来源的比例较大,而来自较温暖的时间间隔的较远来源的比例较大。我们的初步研究表明,在过去的20年里,通风和气候变化之间没有任何明显的滞后。这表明影响圣巴巴拉盆地的环流变化与气候之间存在着紧密的耦合。圣巴巴拉盆地层序一直是一个天生不稳定的环境系统,对全球气候变化高度敏感。我们最近还发现,893站位的层状沉积物序列与格陵兰冰盖记录的几乎整个冰川间期序列(Dansgaard-Oeschger事件)密切相关,间接地与北大西洋的沉积物序列密切相关。我们建议进行研究来检验几个假说:1.圣巴巴拉盆地的通风变化与过去70年期间的全球气候变化密切相关;2.过去70年期间的通风变化与北大西洋深海沉积物记录有关,是通过海洋输送环流的变化,或通过全球气候变化导致的太平洋中间水域的温盐变化,或两者的统一;以及3.最后一次间冰期事件(5E亚期或Eemian亚期)峰温变暖期间的气候;125-115ka)与全新世有很大的不同,影响了中等水层太平洋温盐环流的重大变化,进而导致了我们在圣巴巴拉盆地记录的盆地环境条件的根本变化。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
James Kennett其他文献
James Kennett的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('James Kennett', 18)}}的其他基金
Collaborative Research: Co-Evolution of Submillennial and Orbital Scale Climate and Ocean Behavior during the Last 700 kyrs: The Unique Santa Barbara Basin Record
合作研究:过去 700 公里亚千禧年和轨道尺度气候与海洋行为的共同演化:独特的圣巴巴拉盆地记录
- 批准号:
0825322 - 财政年份:2008
- 资助金额:
-- - 项目类别:
Continuing Grant
SGER: Investigations of a Likely Extraterrestrial Impact at 12.9 ka: Possible Cause of Younger Dryas Cooling, North American Mammal Mass Extinction and Demise of Clovis People
SGER:对 12.9 ka 可能发生的外星撞击的调查:新仙女木变冷、北美哺乳动物大规模灭绝和克洛维斯人灭绝的可能原因
- 批准号:
0713769 - 财政年份:2007
- 资助金额:
-- - 项目类别:
Standard Grant
Extending the High-Resolution Global Climate Record in Santa Barbara Basin: Evaluating Climate Change Potential
扩展圣巴巴拉盆地的高分辨率全球气候记录:评估气候变化潜力
- 批准号:
0623148 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Standard Grant
Acquisition of an Automated Light Gas Stable Isotope Mass Spectrometer for Dedicated Carbonate Analysis (PALEOCEANOGRAPHY, EARTH SYSTEM SCIENCE, ARCHAEOLOGY AND ECOLOGY)
购买用于专用碳酸盐分析(古海洋学、地球系统科学、考古学和生态学)的自动轻气稳定同位素质谱仪
- 批准号:
0320723 - 财政年份:2003
- 资助金额:
-- - 项目类别:
Standard Grant
The Middle Miocene Antarctic Climate Transition: Investigating Magnitude, Phasing, and Processes Involving Cryosphere Expansion and Global Cooling
中新世南极气候转变:调查涉及冰冻圈扩张和全球变冷的幅度、阶段和过程
- 批准号:
0229898 - 财政年份:2003
- 资助金额:
-- - 项目类别:
Standard Grant
Abrupt Climatic Transitions: Surface To Deep-Water Response From High-Resolution Sediment Records, Santa Barbara, California
气候突变:高分辨率沉积物记录的地表到深水响应,加利福尼亚州圣巴巴拉
- 批准号:
0242041 - 财政年份:2003
- 资助金额:
-- - 项目类别:
Continuing Grant
Terminal Millennial Synthesis of Decadal-to-Millenial-Scale Climatic Records of the Last 80 ky
过去 80 年来十年至千年尺度气候记录的千禧年末综合
- 批准号:
9912024 - 财政年份:1999
- 资助金额:
-- - 项目类别:
Standard Grant
Late Quaternary Millennial-Scale Climate Variability of the Southern California Margin: Surface-Deep Water Interactions
南加州边缘晚第四纪千禧年规模的气候变化:地表-深层水相互作用
- 批准号:
9904024 - 财政年份:1999
- 资助金额:
-- - 项目类别:
Continuing grant
Cenzoic Paleoceanographic and Climate Development of the Antarctic Region Based on Oceanic Sediment Sequences
基于海洋沉积序列的南极地区新生代古海洋学和气候发展
- 批准号:
9218720 - 财政年份:1993
- 资助金额:
-- - 项目类别:
Continuing Grant
Stable Isotope Stratigraphy of the Miocene Monterey Formation, California: Testing the Monterey Hypothesis
加利福尼亚州中新世蒙特利组的稳定同位素地层学:检验蒙特利假说
- 批准号:
9218738 - 财政年份:1993
- 资助金额:
-- - 项目类别:
Continuing grant
相似海外基金
Developing rigorous trial designs and methodological guidance for late preclinical studies to better inform human clinical trials
为后期临床前研究制定严格的试验设计和方法学指导,以更好地为人体临床试验提供信息
- 批准号:
474647 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Studentship Programs
Developing a Late Quaternary tephrostratigraphic framework for paleoenvironmental studies in Northwestern Canada
为加拿大西北部的古环境研究开发晚第四纪地层地层框架
- 批准号:
517970-2018 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Northern Research Supplement
Developing a Late Quaternary tephrostratigraphic framework for paleoenvironmental studies in Northwestern Canada
为加拿大西北部的古环境研究开发晚第四纪地层地层框架
- 批准号:
517970-2018 - 财政年份:2021
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Northern Research Supplement
Developing a Late Quaternary tephrostratigraphic framework for paleoenvironmental studies in Northwestern Canada
为加拿大西北部的古环境研究开发晚第四纪地层地层框架
- 批准号:
517970-2018 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Northern Research Supplement
Preliminary research for studies of late Cold War culture and construction of an international cooperative research platform
冷战后期文化研究的初步研究及国际合作研究平台的构建
- 批准号:
20K20694 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Grant-in-Aid for Challenging Research (Exploratory)
Mosaic Workshops in Late Antiquity : Studies in Roman Craftsmen, Patronage and Networks
古代晚期的马赛克工作坊:罗马工匠、赞助人和网络的研究
- 批准号:
20K12856 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Grant-in-Aid for Early-Career Scientists
The exempla in the manuscript AM 657 a-b 4°. Studies in cultural-historical contextualization of short prose narratives in late medieval Iceland
手稿 AM 657 a-b 4° 中的示例。
- 批准号:
429838085 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Research Fellowships
Alcoholic Hepatitis Clinical and Translational Network Late Phase Clinical Trials and Observational Studies 4/9
酒精性肝炎临床和转化网络后期临床试验和观察研究 4/9
- 批准号:
10441258 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Alcoholic Hepatitis Clinical and Translational Network Late Phase Clinical Trials and Observational Studies 4/9
酒精性肝炎临床和转化网络后期临床试验和观察研究 4/9
- 批准号:
10022622 - 财政年份:2019
- 资助金额:
-- - 项目类别:
The Emergence and Development of Classicist School in the Late Edo Period: A Comparison of Chinese and Japanese Evidential Studies
江户后期古典学派的产生与发展:中日实证研究比较
- 批准号:
19J15164 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Grant-in-Aid for JSPS Fellows