Late Glacial-Early Holocene climate evolution on the Tibetan Plateau: a trigger or a response to Northern Hemisphere climate change?

零星的古气候调查表明，青藏高原在晚冰期和全新世早期具有强烈的气候变率。根据模拟方法和现代气候研究，青藏高原气候变率应该对北半球气候演变有很强的影响。尽管青藏高原具有重要的气候意义，但其古气候研究却很少。因此，本研究旨在获得青藏高原晚冰期和全新世早期（19 - 8 cal. ka）气候演变的高分辨率代用数据。以阐明青藏高原的变化如何与北半球气候演变联系在一起。本研究的前期研究发现了青藏高原及其周边地区早全新世气候演化的差异。因此，本研究旨在进一步验证导致这些空间差异的假设和机制。利用花粉-气候传递函数从化石花粉谱中定量重建七月平均气温和年降水量。为此，已经获得了-140个湖泊（作为现代花粉数据校准集）的地表样本和4个选定湖泊的沉积物岩心，并进行了初步分析。拟议的研究将提供古气候类比，以确定最近青藏高原的变暖是否响应或触发了北半球的气候变化。

Sporadic palaeoclimatic investigations revealed a strong climate variability during the Late Glacial and Early Holocene an the Tibetan Plateau. According to modelling approaches and modern climate studies, Tibetan Plateau climate variability should have a strong influence an the Northern Hemisphere climate evolution. Despite of its climatic significance, the Tibetan Plateau was rather seldom subject of palaeoclimatic studies. Therefore, this study aims to obtain high-resolution proxy-data an the climate evolution of the Tibetan Plateau during the Late Glacial and Early Holocene (19 - 8 cal. ka. BP) to illuminate how changes an the Tibetan Plateau are linked to the Northern Hemisphere climatic evolution. Preparatory investigations for this study yielded differences in the early Holocene climate evolution an the Tibetan Plateau and its surroundings. Therefore, this study furthermore aims to test hypotheses an mechanisms causing these spatial differences. Quantitative reconstructions of mean July temperature and annual precipitation will be inferred from fossil pollen spectra using pollen-climate transfer functions. For this purpose, surface samples from -140 lakes (as a modern pollen data calibration set) and sediment cores from four selected lakes have already been obtained and preliminary analyses have been performed. The proposed study was will provide palaeoclimatic analogies whether recent warming an the Tibetan Plateau responses to or rather triggers Northern Hemisphere climate change.