Assessing tropical Pacific climate variability since the Early Pliocene warm period

评估上新世早期温暖期以来的热带太平洋气候变化

• 批准号: 1204254
• 负责人: Ana Ravelo
• 金额: $ 33.59万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1204254&HistoricalAwards=false
• 关键词: Assessing; tropical; Pacific; climate; variability

Paleoceanographic studies have shown that early Pliocene warm period (~3.0 to 4.5 million years ago) was characterized by a permanent El Niño-like mean state. However, it is unclear how high frequency climate variability (e.g., the El Niño Southern Oscillation, or ENSO) was different (if at all), and more generally, how ENSO was impacted by changes in the mean state of the climate system. Questions remain about potential biases in the data, and little is known about high frequency tropical Pacific climate variability during the early Pliocene warm period.This accomplishment-based renewal aims to address these outstanding issues by building on over fifteen years of prior research by the lead investigator, a professor at the University of California at Santa Cruz. Her pioneering work has established much of what is known about the Pliocene, the most recent period in Earth's history when when the average global temperature was higher than today for a sustained period of time. This two part study will include 1) synthesis and review of existing records of early Pliocene variability on different time scales, and 2) generation of new paired Mg/Ca-d18O analyses on single foraminifer shells in order to evaluate within-sample variability thought to be related to high frequency ENSO variability. The principal investigator has trained a generation of students in the techniques and questions framing this research. A graduate student will also be involved in this research and synthesis. A significant part of the proposed work will be a workshop on tropical Pacific climate variability during times of global warmth, especially significant because the Pliocene warm period is thought to be a potential analog for future climate.

古摩纳学研究表明，上新世季度温暖时期（〜3.0至450万年前）的特征是永久性厄尔尼诺尼诺般的平均状态。但是，目前尚不清楚高频气候变异性（例如，厄尔尼诺南部振荡或ENSO）有何不同（如果有的话），更一般而言，ENSO受到气候系统平均状态的变化的影响。关于数据中的潜在偏见仍然存在问题，对上新世季节早期的高频热带太平洋气候变异性知之甚少。基于成就的续订旨在通过在加利福尼亚大学教授的首席研究人员的15年以前的首席研究中建立了15年的先前研究，以解决这些杰出问题。她的开创性工作已经建立了有关上新世的许多知识，这是地球历史上最新的时期，当时全球温度在持续的一段时间内高于今天的平均温度。这项两部分研究将包括1）在不同时间尺度上的早期上新世变异性的现有记录的合成和审查，以及2）在单个有孔壳上生成新的配对MG/CA-D18O分析，以评估与高频ENSO ENSO可变性有关的样本内变异性。首席研究人员已经培训了一代学生在这项研究的技术和问题上进行了质疑。研究生也将参与这项研究和合成。拟议的工作的很大一部分将是全球温暖时期热带太平洋气候变化的研讨会，尤其重要，因为上新世温暖时期被认为是未来攀登的潜在类似物。