Expansion & Collapse of the Cordilleran Ice Sheet during the Quaternary

根据这一奖项，PI将利用不列颠哥伦比亚省温哥华岛海岸外的冰川-海洋沉积物重建科迪勒兰冰盖南端的冰川历史。在15Ka以前，与相应的古气候事件相关的冰川进退在太平洋西北部的记录很少。巨型活塞岩芯MD02-2496将被用来解释过去500kA(在ODP888站)科迪勒兰冰盖的消长历史。由于北太平洋对北美的下风向气候(包括急流)影响很大，从这项研究中获得的数据应该会提高气候模拟、解释冰川地貌和计算大陆剥蚀率的能力。了解不列颠哥伦布大陆架何时被冰覆盖以及何时发生冰山排放，将考验试图通过北太平洋沿海路线占领美洲大陆的早期人类迁徙路线的可行性。PI将检查巨型活塞核心(MD02-2496)和ODP888站点的颗粒大小和沉积物组构，以确定该地区冰盖的生长和衰退。同时，将根据浮游有孔虫d18O生成高质量的14C数据和当地海面温度。海底d18O值将被用来解决全球冰量的变化。

Under this award the PIs will reconstruct the glacial history of the southern limb of the Cordilleran Ice sheet using glacial-marine sediments off the coast of Vancouver Island, British Columbia. Glacial advances and retreats associated with corresponding paleoclimatic events are poorly documented in the Pacific Northwest prior to 15 Ka. The jumbo piston core MD02-2496 will be used to interpret the history of growth and decay of the Cordilleran Ice Sheet over the last 500 Ka (at ODP Site 888). As the North Pacific greatly affects the climate (including the jet stream) downwind across North America, data obtained from this study should advance ability to model climate, to interpret glacial geomorphology and calculate continental denudation rates. Knowledge of when the British Columbian shelf was ice covered and when iceberg discharge occurred will test the feasibility of the migration route of early humans attempting to occupy the American continent via the North Pacific coastal route. The PI will examine particle size and sediment fabric within a jumbo piston core (MD02-2496) and at ODP Site 888 to determine ice sheet growth and decay in the region. At the same time high quality 14C dates and local sea surface temperatures will be generated based on planktonic foraminiferal d18O. Benthic d18O values will be employed to resolve changes in global ice volume.