Paleoenvironmental reconstructions from Chilean lake, fjord, and marine sediments and paleoclimate modelling with special emphasis on variations of the westerly wind belt during the Holocene (HoloParc)

智利南部的气候受到南部西风带的强烈影响。因此，它是研究这一重要风系的强度和纬度位置的全新世变化的关键区域，特别是考虑到最近提出的西风在全球大气二氧化碳收支中可能发挥的作用。该项目的主要目标是使用基于沉积学和新型有机替代物的多代理方法来重建全新世期间智利南部温度、植被和湿度的数十年至千年尺度的变化。这些代理结果将与瞬变全新世气候模式模拟相结合，以阐明潜在的强迫机制。将对湖泊、峡湾和围绕西风中心的开阔海洋档案进行调查，其优势不仅是在这些不同环境之间建立联系，而且还可以覆盖强气候梯度地区的广泛纬度高分辨率古环境档案(33°S-53°S)。模式试验将利用全球社区气候系统综合模式(CCSM)3.0版进行。

The climate of southern Chile is strongly influenced by the southern westerly wind belt. It therefore represents a key region to investigate Holocene changes in the intensity and latitudinal position of this important wind system, especially considering a possible role of the westerly winds in the global atmospheric CO2 budget as recently suggested. The main objective of this project is to use a multi-proxy approach based on sedimentological and novel organic proxies to reconstruct multidecadal-to-millennial-scale changes in temperature, vegetation, and humidity in southern Chile during the Holocene. These proxy results will be combined with transient Holocene climate model simulations in order to elucidate potential forcing mechanisms. Lake, fjord, and open ocean archives encompassing the center of the westerly winds will be investigated, with the advantage of not only establishing a link between these different environments, but also of covering a wide latitudinal range of high-resolution paleoenvironmental archives (33°S-53°S) in a region of strong climate gradients. Model experiments will be carried out with the comprehensive global Community Climate System Model (CCSM), version 3.0.