权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Constraining Temporal Movement of the ITCZ in the Eastern Equatorial Pacific Using Radiogenic Isotopes

利用放射性同位素约束东赤道太平洋 ITCZ 的时间运动

基本信息

批准号：
1103157
负责人：
Franco Marcantonio
金额：
$ 23.4万
依托单位：
Texas A&M Research Foundation
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2011
资助国家：
美国
起止时间：
2011-08-01 至 2014-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1103157&HistoricalAwards=false
关键词：
Constraining Temporal Movement ITCZ Eastern

项目摘要

Dust levels in the atmosphere have important potential effects on climate, including impacts on the Earth's radiative balance and on marine primary productivity, and thus atmospheric CO2, via "fertilization" of surface waters. Information about changes in dust provenance and flux is critical to ground truth atmospheric circulation models, which are are used to investigate the role that dust has on feedbacks which connect continental conditions and global climate.This research, conducted by scientists at Texas A & M University, investigates dust provenance changes in the eastern equatorial Pacific during the late Quaternary. The researchers will perform a temporal study along a transect of sediment cores crossing the equator, as well as a spatial study of modern sediments from a wide area of the eastern equatorial Pacific, analyzing the radiogenic isotope and trace element geochemistry of the dust fraction. In addition, they will determine radiogenic isotope signatures of various end members samples representing the potential dust sources to the Eastern Equatorial Pacific (China, NW South America, SW North America, Australia, northern Africa). This paleo-provenance study will lead to better understanding of the large-scale meridional atmospheric circulation variability of the tropics, which in turn can shed light of past climate forcing mechanisms. Funding supports a PhD student and provides opportunities for undergraduate involvement in research. Results will be incorporated into courses taught by the lead investigator.

大气中的粉尘水平对气候具有重要的潜在影响，包括对地球辐射平衡和海洋初级生产力的影响，以及通过地表水的“施肥”对大气二氧化碳的影响。关于沙尘来源和通量变化的信息对地面真实大气环流模式至关重要，这些模式用于研究沙尘在连接大陆条件和全球气候的反馈中的作用。这项研究是由德克萨斯农工大学的科学家们进行的，他们调查了第四纪晚期赤道东太平洋地区尘埃来源的变化。研究人员将沿着穿越赤道的沉积物岩心样带进行时间研究，并对赤道东太平洋广大地区的现代沉积物进行空间研究，分析尘埃部分的放射性成因同位素和微量元素地球化学。此外，他们将确定代表东赤道太平洋（中国、南美西北部、北美西南部、澳大利亚、北非）潜在粉尘源的各种端元样品的放射性成因同位素特征。这项古物源研究将有助于更好地理解热带大尺度经向大气环流的变化，从而揭示过去的气候强迫机制。资助博士生，并为本科生参与研究提供机会。研究结果将被纳入首席研究员讲授的课程。