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首页> 外文期刊>Nature >Regional insolation forcing of late Quaternary climate change in the Southern Hemisphere
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Regional insolation forcing of late Quaternary climate change in the Southern Hemisphere

机译：南半球晚第四纪气候变化的区域日照强迫

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摘要

In agreement with the Milankovitch orbital forcing hypothesis(1) it is often assumed that glacial - interglacial climate transitions occurred synchronously in the Northern and Southern hemispheres of the Earth. It is difficult to test this assumption, because of the paucity of long, continuous climate records from the Southern Hemisphere that have not been dated by tuning them to the presumed Northern Hemisphere signals(2). Here we present an independently dated terrestrial pollen record from a peat bog on South Island, New Zealand, to investigate global and local factors in Southern Hemisphere climate changes during the last two glacial - interglacial cycles. Our record largely corroborates the Milankovitch model of orbital forcing but also exhibits some differences: in particular, an earlier onset and longer duration of the Last Glacial Maximum. Our results suggest that Southern Hemisphere insolation may have been responsible for these differences in timing. Our findings question the validity of applying orbital tuning to Southern Hemisphere records and suggest an alternative mechanism to the bipolar seesaw for generating interhemispheric asynchrony in climate change.
机译：与米兰科维奇轨道强迫假说（1）相一致，通常假定冰川-冰川间的气候转变在地球的北半球和南半球同步发生。由于缺乏来自南半球的长期，连续的气候记录，而这些记录尚未通过将其调整为假定的北半球信号来确定日期，因此很难验证这一假设（2）。在这里，我们提供了一个来自新西兰南岛泥炭沼泽的独立注明日期的陆地花粉记录，以调查过去两个冰川-冰川间周期中南半球气候变化的全球和本地因素。我们的记录在很大程度上证实了米兰科维奇的轨道强迫模型，但也表现出一些差异：特别是“最后一次冰河极大期”的起效时间更长且持续时间更长。我们的结果表明，南半球的日照可能是造成这些时间差异的原因。我们的发现质疑将轨道调谐应用于南半球记录的有效性，并提出了双极跷跷板的另一种机制，用于在气候变化中产生半球非同步。

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