Data-Model Synthesis: Gulf of Alaska Sea-Surface Paleotemperature, Freshwater Input, and the Dynamics of Deglacial Climate Variability

高纬度北太平洋是了解海洋气候系统过去变化的关键区域，是的，与全球海洋的类似重要区域相比，它仍然研究不足，采样不足。针对末次盛冰期（LGM）北太平洋地区的模拟结果存在分歧，且目前还没有全面的古海洋学记录来验证模拟结果的问题，本研究采用多代用指标和多模式合成相结合的方法，对末次盛冰期北太平洋海表温度和上层海洋的变化进行了研究。该项目由俄勒冈州州立大学的教师与葡萄牙的研究人员合作领导，将利用以前实地活动的沉积物岩心来获得替代数据。使用多个代理（氧同位素，有孔虫和硅藻组合，镁/钙从南极有孔虫，聚集同位素分析，和烯酮古温度计）将有助于解决不一致，避免由单一代理重建产生的偏见。多代理数据将与多个模型的综合进行比较，以建立对LGM时北太平洋行为的约束。这项工作将使人们更好地了解与区域政策问题有关的北太平洋海洋气候动态（例如，阿拉斯加冰川融化，影响北太平洋渔业的变化）。该项目包括劳动力发展和指导，在广泛的水平，包括在葡萄牙的博士后助理，在俄勒冈州立大学的博士生，从一个代表性不足的少数群体的俄勒冈州立大学本科生，和高中学生通过俄勒冈州立大学周六学院和NSF的研究学徒高中学生计划。俄勒冈州立大学的教职员工将与国家公园服务代表合作，将项目成果纳入三个阿拉斯加国家公园和阿拉斯加气候变化应对计划的宣传材料中。

The high-latitude North Pacific is a key region for understanding past changes in the ocean-climate system, yes it remains understudied and undersampled compared to similarly important regions of the global oceans. Attempts to model the North Pacific region at the Last Glacial Maximum (LGM) have produced divergent results, and currently no comprehensive paleoceanographic records exist to verify model output.To address this problem, this study will investigate North Pacific sea surface temperature and upper ocean changes at the LGM using a combined multi-proxy and multi-model synthesis approach. The project, led by faculty members at Oregon State University in collaboration with researchers in Portugal, will leverage sediment cores from previous field campaigns to obtain proxy data. The use of multiple proxies (oxygen isotopes, foraminiferal and diatom assemblages, Mg/Ca from planktonic foraminifera, clumped isotope analysis, and alkenone paleothermometry) will help to resolve inconsistencies and avoid biases produced by single-proxy reconstructions. Multi-proxy data will be compared with a synthesis of multiple models to establish constraints on the behavior of the North Pacific at the LGM. This work will produce a better understanding of North Pacific ocean-climate dynamics that are relevant to regional policy concerns (e.g., Alaskan glacier melt, changes affecting North Pacific fisheries). The project includes workforce development and mentoring at a wide range of levels, including post-doctoral associates in Portugal, a PhD student at OSU, an OSU undergraduate student from an underrepresented minority group, and high school students through the OSU Saturday Academy and NSF's Research Apprenticeships for High School Students program. OSU faculty members will work with National Park Service representatives to incorporate project results into outreach materials for three Alaskan National Parks and the NPS Climate Change Response program.