ESH: RUI: A 9,000 Year Diatom Record of Climate Fluctuations From Lake Victoria, East Africa, With Decade-Scale Resolution
ESH:RUI:东非维多利亚湖 9000 年来气候波动的硅藻记录,具有十年尺度分辨率
基本信息
- 批准号:9808972
- 负责人:
- 金额:$ 9.2万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:1999
- 资助国家:美国
- 起止时间:1999-01-01 至 2001-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
9808972StagerPaleoclimatic research in tropical Africa relies heavily upon analysis of microfossils in lake sediment cores, and with these tools it has provided abundant evidence of dramatic fluctuations in equatorial temperatures, hydrology, and climatic seasonality since the Pleistocene. However, much of this work has suffered from several important limitations, among them (1) relatively coarse temporal resolution of microfossil series, (2) incomplete records due to erosion and/or discontinuous sedimentation, (3) difficulty in teasing out the relative contributions of past rainfall, winds, and other climatic factors to observed changes in the fossil record, and (4) difficulties in radiocarbon dating of cores, including ancient carbon reservoir effects and insufficient number of dates. These limitations have not only reduced the clarity of many paleoclimatic reconstructions; they often hinder comparisons between sites.For this RUI proposal, the PI has subsampled a 9.9 m long sediment core from Lake Victoria, East Africa, at 2 cm intervals, and proposes to conduct a high-resolution analysis of the diatoms (single-celled algae with glass shells) preserved in those subsamples that will avoid the aforementioned limitations. The results of this project are likely to represent a significant contribution to our understanding of the history of, and forcing mechanisms behind, equatorial climates of the Holocene. The temporal detail will be unprecedented among tropical records of this length, yielding 16-18 year resolution over a span of roughly 9,000 14C years. Holocene sedimentation regimes in Lake Victoria have been remarkably uniform, so date interpolation for this record should be quite reliable. Because this core comes from an inshore site, it contains evidence of past lake level fluctuations (due to climatic changes) as represented by changes in the relative abundances of littoral diatoms. In addition, other fossil diatom taxa indicative of water column mixing regimes will yield a record of past fluctuations in monsoonal wind activity. From these unusually detailed diatom records, it should be possible to reconstruct a long and exceptionally detailed record of East African droughts, to gain insights into the role of short-term periodic climate oscillations in the tropics, to seek evidence of cyclic solar forcing of African climates, and to confirm the timing and nature of the abrupt climatic transition to greater tropical rainfall seasonality ca. 7200 years ago, as well as of the "Medieval Warm Period" and "Little Ice Age" interval which are still poorly documented in East Africa. The results of this study will be compared to other paleoclimatic datasets as well, including equatorial multi-proxy records and high-resolution polar ice core records, putting the climatic history of Lake Victoria into a global context.
9808972 StagerPaleoclimatic研究在热带非洲严重依赖于湖泊沉积物岩心中的微体化石分析,并与这些工具,它提供了丰富的证据赤道温度,水文和气候季节性的剧烈波动更新世以来。 然而,这项工作的大部分都受到几个重要限制,其中包括:(1)微体化石系列的时间分辨率相对较低,(2)由于侵蚀和/或不连续的沉积作用,记录不完整,(3)难以梳理出过去的降雨,风和其他气候因素对化石记录中观察到的变化的相对贡献,以及(4)难以对岩心进行放射性碳测年,包括古老的碳库效应和日期数量不足。 这些局限性不仅降低了许多古气候重建的清晰度;他们经常阻碍站点之间的比较,对于RUI的建议,PI从东非维多利亚湖以2厘米的间隔对9.9米长的沉积物岩心进行了二次采样,并建议对硅藻进行高分辨率分析(具有玻璃壳的单细胞藻类)保存在那些子样品中,这将避免上述限制。 这个项目的结果可能是一个重大的贡献,我们的历史的理解,和背后的强迫机制,全新世赤道气候。 时间细节将是前所未有的热带记录的这种长度,产生16-18年的分辨率在大约9,000 14 C年的跨度。 维多利亚湖的全新世沉积状态非常均匀,因此,对这一记录的日期插值应该是相当可靠的。 因为这个核心来自一个近岸网站,它包含了过去的湖平面波动(由于气候变化)的证据,代表了沿岸的硅藻的相对丰度的变化。 此外,其他化石硅藻类群表明水柱混合制度将产生过去的季风风活动的波动记录。 从这些异常详细的硅藻记录中,应该可以重建一个长期和异常详细的东非干旱记录,深入了解热带地区短期周期性气候振荡的作用,寻找非洲气候周期性太阳强迫的证据,并确认突然气候过渡到更大的热带降雨季节性的时间和性质。7200年前,以及“中世纪温暖期”和“小冰河期”的间隔,这仍然是在东非缺乏记录。 这项研究的结果也将与其他古气候数据集进行比较,包括赤道多代理记录和高分辨率极地冰芯记录,将维多利亚湖的气候历史置于全球背景下。
项目成果
期刊论文数量(0)
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Jay Stager其他文献
Jay Stager的其他文献
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{{ truncateString('Jay Stager', 18)}}的其他基金
RUI: High-Resolution Lacustrine Records of Precipitation Variability in the Northeastern United States during the Last Millennium
RUI:上个千年美国东北部降水变化的高分辨率湖泊记录
- 批准号:
1358362 - 财政年份:2014
- 资助金额:
$ 9.2万 - 项目类别:
Standard Grant
RUI: High-resolution sediment records of late Holocene paleohydrology from the summer and winter rainfall regions of South Africa.
RUI:南非夏季和冬季降雨地区全新世晚期古水文学的高分辨率沉积物记录。
- 批准号:
0822922 - 财政年份:2008
- 资助金额:
$ 9.2万 - 项目类别:
Continuing Grant
Late Holocene Geo-biologic Records of Climate Changes at Lake Tanganyika, East Africa, with Seasonal to Decadal Resolution
东非坦噶尼喀湖气候变化的晚全新世地球生物记录,具有季节到年代际分辨率
- 批准号:
0401845 - 财政年份:2004
- 资助金额:
$ 9.2万 - 项目类别:
Standard Grant
RUI: Sediment Records of Environmental Changes at Lake Victoria, East Africa, during the Past Millenium with Decade-Scale Resolution
RUI:过去千年东非维多利亚湖环境变化的沉积物记录,具有十年尺度的分辨率
- 批准号:
0117170 - 财政年份:2001
- 资助金额:
$ 9.2万 - 项目类别:
Standard Grant
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