Collaborative Research: Evolution of the Climate Continuum - Late Paleogene to Present

合作研究：气候连续体的演化——古近纪晚期至今

基本信息

批准号：
1003380
负责人：
Linda Hinnov
金额：
$ 3.29万
依托单位：
Johns Hopkins University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2010
资助国家：
美国
起止时间：
2010-08-01 至 2014-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003380&HistoricalAwards=false
关键词：
Collaborative Research Evolution Climate Continuum

项目摘要

Determining the driving forces behind climate change, as well as the sensitivity of Earth's climate system to these forces, is a central question in paleoclimate research. This study will provide the first explicit evaluation of changes in stochastic versus deterministic climate processes associated with the evolution of the Late Paleogene to Neogene climate system (36 Ma to the present). This timeframe was chosen because high quality, high resolution, continuous data are available for analysis, and because the interval spans the transition from a high pCO2 "Greenhouse" climate to a low pCO2 "Icehouse" world. The investigators focus on the analysis of published foraminiferal oxygen and carbon isotope records and use a number of techniques rooted in Thomson's multi-taper spectral method (MTM), as well as a suite of non-linear time series analysis methods. The project will generate several products: 1) a new high resolution benthic d18O composite record spanning 36 Ma to the present, 2) an analysis of the evolution of orbital signals over the same timeframe, and 3) a quantification of changes in stochastic climate variability during the Late Paleogene to Neogene, and an assessment of the relative dominance of deterministic orbital versus stochastic climate energy through the Greenhouse-Icehouse climate transition. Funding supports collaboration between a young PI and a senior female scientist, as well as graduate student training. The algorithms produced in the course of the research will be made publicly available as a resource for the broader climate science community.

确定气候变化背后的驱动力以及地球气候系统对这些力的敏感性是古气候研究的核心问题。这项研究将对与古近纪晚期到新近纪气候系统（36 Ma至今）演化相关的随机气候过程与确定性气候过程的变化进行首次明确评估。选择这个时间范围是因为高质量、高分辨率、连续的数据可供分析，并且因为该时间间隔跨越了从高 pCO2“温室”气候到低 pCO2“冰屋”世界的过渡。研究人员重点分析已发表的有孔虫氧和碳同位素记录，并使用了多种源于汤姆森多锥光谱法 (MTM) 的技术以及一套非线性时间序列分析方法。该项目将产生多种产品：1）跨越 36 Ma 至今的新高分辨率底栖 d18O 复合记录，2）对同一时间范围内轨道信号演变的分析，以及 3）随机气候变率变化的量化晚古近纪到新近纪期间的研究，以及通过温室-冰室气候转变确定性轨道与随机气候能量的相对优势的评估。资金支持年轻 PI 和资深女科学家之间的合作以及研究生培训。研究过程中产生的算法将作为更广泛的气候科学界的资源公开提供。