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，与全球海洋中同样重要的区域相比，对它的研究和采样仍然不足。对北太平洋地区末次冰盛期(LGM)进行模拟的尝试产生了不同的结果，目前还没有全面的古海洋学记录来验证模型的输出。为了解决这个问题，本研究将使用多代理和多模型综合的方法来研究LGM的北太平洋海温和上层海洋变化。该项目由俄勒冈州立大学的教职员工领导，与葡萄牙的研究人员合作，将利用之前现场活动中的沉积物岩芯来获得代理数据。使用多个替代物(氧同位素、有孔虫和硅藻组合、浮游有孔虫的镁/钙、成团同位素分析和烯酮古温度测定)将有助于解决不一致问题，并避免单一替代物重建产生的偏差。多代理数据将与多个模型的合成进行比较，以建立对北太平洋在末次盛会上的行为的限制。这项工作将更好地了解与区域政策关切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)。该项目包括各种级别的劳动力发展和指导，包括葡萄牙的博士后助理、俄亥俄州立大学的一名博士生、俄亥俄州立大学来自少数族裔群体的本科生，以及通过俄亥俄州立大学星期六学院和NSF的高中学生研究学徒计划的高中生。俄亥俄州立大学的教职员工将与国家公园管理局的代表合作，将项目成果纳入阿拉斯加三个国家公园和NPS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.