Exploring the potential of a new North American Plio-Pleistocene paleoclimate record from a drillcore from Paleo-Lake Idaho

探索来自古爱达荷湖钻芯的新北美普里奥-更新世古气候记录的潜力

• 批准号: 438282349
• 负责人: Professor Dr. Jörg Pross
• 金额: --
• 依托单位: Arbeitsgruppe Geophysik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/438282349?language=en
• 关键词: Exploring; potential; new; North; American

This is a follow-up proposal of a previously granted interdisciplinary project that focused on exploring the paleoclimate potential of the ICDP-derived MHAFB11 core, a high-quality sediment core from Paleolake Idaho that may develop into a key archive for late Pliocene to early Pleistocene climate and ecosystem change in the mid-latitudes of North America. Whereas for the first project phase one proposal consisting of three proposal components had been submitted, we here submit the continuation requests as two stand-alone, but still thematically related proposals. The sub-projects that the PIs of the present proposal have been responsible for during the first project phase have yielded a crucial paleomagnetic age marker (i.e., the position of the Gauss/Matuyama reversal) and a first, low-resolution pollen record across the Pliocene/Pleistocene transition interval. The here proposed follow-up project for the final twelve project months aims (i) to establish a palynological dataset with a mean resolution of 1.5 m across the 440–730 m study interval of the MHAFB11 core, which to our knowledge will be the first of its kind for North America, and (ii) to generate pollen-based reconstructions of vegetation and climate dynamics. Based on the resulting datasets, the project will develop conceptual paleoenvironmental and paleoclimatic models for the Plio¬cene/Pleistocene transition in the mid-latitudes of western North America. It will critically assess existing scenarios for the climatic processes across the Plio¬ce-ne/Pleistocene transition. In particular, its geographical position within western North America will make it possible to test the hypothesis that enhanced humidity from the Pacific may have provided water vapour to northern North America, thereby allowing the initiation of Nor¬thern Hemisphere glaciation.

这是先前批准的一个跨学科项目的后续提案，该项目的重点是探索 ICDP 衍生的 MHAFB11 岩心的古气候潜力，这是一个来自爱达荷州古湖的高质量沉积物岩心，可能会发展成为北美中纬度地区上新世晚期到更新世早期气候和生态系统变化的关键档案。鉴于第一个项目的第一阶段提案已提交，该提案由三个提案组成部分组成，我们在此将继续请求作为两个独立但仍主题相关的提案提交。本提案的 PI 在第一项目阶段负责的子项目已经产生了一个重要的古地磁年龄标记（即高斯/松山反转的位置）和整个上新世/更新世过渡区间的第一个低分辨率花粉记录。这里提出的最后 12 个项目月份的后续项目旨在 (i) 在 MHAFB11 核心的 440-730 m 研究间隔内建立平均分辨率为 1.5 m 的孢粉学数据集，据我们所知，这将是北美的第一个此类数据集，以及 (ii) 生成基于花粉的植被和气候动态重建。根据所得数据集，该项目将开发北美西部中纬度地区上新世/更新世过渡的概念性古环境和古气候模型。它将严格评估上新世/更新世过渡期间气候过程的现有情景。特别是，它位于北美西部的地理位置将使得检验以下假设成为可能：太平洋增加的湿度可能向北美北部提供了水蒸气，从而使北半球冰川作用得以启动。