Paleoclimate in Southern South America and Its Relation to Antarctic Paleoclimates

南半球快速、年轻的仙女木气候事件的存在仍然是一个巨大的争论。如果这一事件在南半球有可检测到的影响，那么由内部振荡引起的气候变化可能对全球范围内的气候变化很重要。该提案要求提供支持，以重建在上一次冰川-间冰期过渡期间在南半球观察到的气候高频变化，也就是年轻的仙女座事件发生的时间。古气候记录将基于泥炭剖面中的花粉组合变化和D/H比。D/H比是温度和水分利用率的函数。PI希望校准该区域的D/H变化，然后使用校准来量化过去的变化。因此，D/H比值将补充花粉数据，并有助于确定在冰川消融期间哪些气候参数发生了变化。这项研究很重要，因为我们还不知道南半球的气候历史。在我们完全了解气候突变的机制之前，有必要先了解这个半球的气候变化程度。

The existence of the rapid, Younger Dryas climate event in the southern hemisphere is still a matter of great debate. If this event had detectable effects in the southern hemisphere, then variations in climate caused by internal oscillations may be important for altering climate on a global scale. This proposal requests support to reconstruct the high frequency changes in climate observed in the southern hemisphere during the last glacial-interglacial transition, the time of the Younger Dryas event. The paleoclimate records will be based on pollen assemblage variations and D/H ratios in peat sections. D/H ratios are a function of temperature and moisture availability. The PIs wish to calibrate the D/H variations for this region and then use the calibration to quantify the variations in the past. Thus the D/H ratios will supplement the pollen data and help to identify what climate parameters changed during the deglaciation. This research is important because we do not yet know the history of climate in the southern hemisphere. It is necessary to understand the extent of climate change in this hemisphere before we fully understand the mechanisms of abrupt climate change.