Holocene sediment physical properties in four southwest Greenland lakes, 2016-2018

The climate and ice sheet history of Greenland are important to reconstruct for providing a longer-term context to ongoing changes. The goal of this award was to determine how sensitively past Arctic ice sheets responded to abrupt climate change on the order of global warming. To do this, the Principal Investigators (PIs) generated histories of ice sheet and glacier changes from Greenland and Arctic Canada spanning the last period in Earth history of major ice sheet demise (~12,000 to ~7000 years ago) using both lake sediment records and chronologies of moraines using cosmogenic nuclide exposure dating. The PIs and their graduate students visited remote parts of Greenland to collect geologic samples from features - still preserved on the landscapes today – that were generated when vast ice sheets retreated at the end of the last Ice Age. With these samples, the group reconstructed the timing of past ice sheet and climate changes. This dataset contains downcore analyses for sediment cores from four lakes in Southwest Greenland.

重建格陵兰岛的气候与冰盖历史，可为当前持续发生的气候变化提供更长时间尺度的背景参考，具有重要科学意义。本科研资助项目的目标是厘清北极古冰盖对强度相当于当前全球变暖幅度的突发性气候变化的响应敏感性。为此，首席研究员（Principal Investigators，PIs）借助湖泊沉积物记录与宇宙成因核素暴露测年法获取的冰碛物年代序列，重建了格陵兰岛与加拿大北极地区在地球历史上末次大规模冰盖消退时段（约12000至7000年前）的冰盖与冰川变化历史。首席研究员及其研究生前往格陵兰岛偏远区域，采集末次冰期末期巨型冰盖消退时形成、至今仍保留在地表地貌中的地质样本。依托这些样本，研究团队重建了古冰盖与古气候变化的发生时序。本数据集包含格陵兰岛西南部四座湖泊沉积物岩芯的岩芯剖面分析数据。