Collaborative Research: Bioclimatic Reconstruction of the Past 50,000 Years from Eolian Sequences in the Westerlies-Dominated Central Asia

合作研究：根据西风带主导的中亚风成序列重建过去五万年的生物气候

• 批准号: 0623514
• 负责人: Kam-biu Liu
• 金额: $ 14万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2010-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0623514&HistoricalAwards=false
• 关键词: Collaborative; Research; Bioclimatic; Reconstruction; Past

This study aims to reconstruct a detailed bioclimatic history of the last 50,000 years in the westerlies-dominated Central Asia based on a multi-proxy study of several thick eolian sections. The westerlies-dominated region includes the Dzungaria Basin (northwestern Xinjiang) and the Kazakhstan Hills and Plains (eastern Kazakhstan) that mark the conjunction between the East Asian Monsoon and the westerlies-dominated "European" climate systems. This investigation will produce paleoclimatic proxy records from a suite of loess/paleosol sections that span the past 50,000 years. A combination of geophysical, geochemical, and geobiological proxies will be used in the reconstruction. Bioclimatic transfer functions based on pollen, snails, carbon-13 of organic matter, and environmental magnetic parameters will be produced along three N-S transects to provide regional coverage of bioclimatic changes during the past 50,000 years. A relatively high-resolution reconstruction of bioclimatic changes from eolian sequences in the study area shall provide a context for understanding hemispheric- and global-scale forcing mechanisms and ocean-atmosphere-continent couplings throughout the past 50,000 years. The bioclimatic reconstruction will permit a better understanding of not only the interacting history between the East Asian monsoons and the westerlies but also the teleconnections between the North Atlantic Oscillation (NAO) and the Pacific North American (PNA) Oscillation. The outcomes of this research will improve understanding of the land-air coupled feedback mechanisms and validate the hypothesis that atmospheric aerosol influx might have triggered global atmospheric CO2 changes. This project will enhance partnership possibilities in a global network of aerosol studies by establishing collaborations among international institutions (U.S., Kazakhstan, and China) and the reconstructed bioclimatic history will provide insight for combating the ongoing problem of human-exacerbated desertification in Central Asia.

这项研究旨在根据对几个厚的Eolian部分的多种研究研究，重建过去50，000年的详细生物气候历史。西北地区为主导的地区包括丁甘尼亚盆地（西北新疆）和哈萨克斯坦山和平原（哈萨克斯坦东部），它们标志着东亚季风和西亚斯利群岛统治的“欧洲”气候系统之间的结合。这项调查将从过去50，000年的一系列黄土/古溶部分中产生古气候代理记录。重建将使用地球物理，地球化学和地质学代理的结合。基于花粉，蜗牛，有机物的碳13和环境磁参数的生物气候转移功能将沿着三个N-S样品产生，以在过去50，000年内提供生物气候变化的区域覆盖范围。在过去的50，000年中，研究区域中的Eolian序列对生物气候变化的重建相对较高，应为了解半球和全球尺度的强迫机制和大气 - 大气式耦合提供一个背景。生物气候重建将不仅可以更好地理解东亚季风与西风之间的相互作用历史，还可以更好地理解北大西洋振荡（NAO）与太平洋北美（PNA）振荡之间的远程连接。这项研究的结果将提高对陆地耦合反馈机制的了解，并验证大气中气溶胶涌入可能触发了全球大气二氧化碳的变化的假设。该项目将通过建立国际机构（美国，哈萨克斯坦和中国）之间的合作，增强全球气溶胶研究网络的伙伴关系可能性，而重建的生物气候历史将提供洞察力，以打击中亚人类避免荒漠化的持续问题。