Aeolian Dust Dynamics in Asia and their Teleconnection with Abrupt Climate Events in the Northern Hemisphere during the last 130.000 years: palaeoclimatic processes, feedbacks and impacts on Earth's climate system

亚洲风沙动态及其与过去13万年北半球突变气候事件的遥相关：古气候过程、反馈和对地球气候系统的影响

• 批准号: 244672114
• 负责人: Professor Dr. Björn Machalett
• 金额: --
• 依托单位: Department of Geosciences
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/244672114?language=en
• 关键词: Aeolian; Dust; Dynamics; Asia; their

Understanding abrupt temperature shifts and millennial-scale climate oscillations, known as Dansgaard-Oeschger (DO) events, during the last glaciation, is an outstanding question in Quaternary paleoclimatology. High-resolution studies on Greenland ice cores pointed out that the onsets of abrupt Greenland warmings (DO events) were slightly preceded by decreasing Greenland dust deposition, reflecting a recessive aridity in the Asian deserts and thus reduced continental dust outbreaks into the Northern Hemisphere from the Asian dust sources. It remains a pressing problem to identify the synoptic atmospheric processes that account for the aridity swings in Asia and to decipher why those dynamics are coherent with, or moreover, slightly preceding DO events recorded in Greenland ice cores.Mineral dust in the atmosphere plays an important role in modifying climate, being both a product and a cause of climate change. Once deposited, accumulations of mineral dust provide a record of past climate and atmospheric circulation. The thick loess sequences found along the foothills and forelands of the central and east Asian high mountains are the only terrestrial climate archive and prime recorder of glacial-interglacial and sub-millennial changes in Asian dust transport dynamics. Loess records provide a unique insight into the climate driven continental dust load in the Northern Hemisphere at its major source. The project aims to test hypothesized links between abrupt climate variability recorded in Greenland and associated climate dynamics at Asian dust source areas. Furthermore, the project is designed to investigate to what extend the central and high Asian mountains are a crucial element within the sensitive glacier-desert-dust response system in interior Eurasia and to what extent they may be considered a pacemaker of suborbital global climate changes and an initiator of abrupt climate oscillations in the Northern Hemisphere.High resolution loess records in western Tajikistan, at the fringe of the Taklamakan Desert, and on the Chinese Loess Plateau will be analysed in order to derive an understanding of regional, large-scale aeolian transport dynamics and variability related to atmospheric circulation systems operating in the immediate circumference of the central and high Asian mountain ranges. Linking and correlating the established robust Asian dust proxy records with other high resolution climate records in the Northern Hemisphere constitutes a major aim of the project and will add to the knowledge about the land-atmosphere-ocean interactions and processes. The latter is indispensable for the understanding of recurrent interactions and complex feedbacks in past climate changes and thus fundamentally important to identify synoptic paleoclimatic patterns of atmospheric circulation in the Northern Hemisphere, which holds the key to understand drivers and triggers of abrupt climate dynamics in Earth's climate system during the last 130.000 years.

在最后一次冰川期间，了解突然的温度变化和千禧一代的气候振荡，即Dansgaard-Oeschger（DO）事件，是第四纪古气候学的一个杰出问题。关于格陵兰冰核心的高分辨率研究指出，在格陵兰岛突然变暖（DO事件）的打击略有减少格陵兰尘的沉积，反映了亚洲沙漠中隐性的凹陷，从而减少了来自亚洲尘埃的大陆尘埃爆发进入北半部的大陆尘埃。确定构成亚洲的干旱波动的概要大气过程以及解读为什么这些动态与格陵兰冰块中记录的事件相一致或稍有稍微稍有的事件。大气中的敏捷作用在改变气候和气候变化的气候变化方面起着重要作用，这仍然是一个紧迫的问题。沉积后，矿物灰尘的积累提供了过去的气候和大气循环的记录。在亚洲尘埃运输动力学中，沿中央和东亚高山的山麓和前陆沿山麓和东亚高山的前陆发现了厚的黄土序列。 Loess Records对其主要来源的北半球气候驱动的大陆粉尘负荷提供了独特的见解。该项目旨在测试格陵兰岛记录的突然气候变异性与亚洲尘埃源区域相关气候动态之间的假设联系。此外，该项目旨在调查在欧洲内部敏感的冰川 - dest-dust-dust dust响应系统中延长中央和高等的山脉的重要因素，以及它们在多大程度上可能被视为全球气候气候变化的起搏器，并且是北部半场的突然气候振荡的起点。在中国黄土高原上，将进行分析，以了解与中央和高亚洲山脉直接运行的大气循环系统相关的区域大规模的风力和可变性。将既定的亚洲尘埃代理记录与北半球的其他高分辨率气候记录联系起来并将其联系起来是该项目的主要目的，并将增加有关土地 - 大气 - 海洋相互作用和过程的知识。后者对于了解过去气候变化的复发相互作用和复杂的反馈是必不可少的，因此对于确定北半球大气循环的概要古气候模式至关重要，这是在过去130.000年内地球气候系统中突然气候动力学的驱动因素和触发的关键。