Collaborative research: Construction of a continuous, high resolution and absolutely-dated marine chronology from the Gulf of Maine during the last millennium

重建和理解晚全新世气候变率的时空模式仍然是古气候学的一个基本挑战，特别是在北大西洋涛动(NAO)和大西洋经向翻转环流(AMOC)等耦合系统方面。具有年度或更好时间尺度的绝对年表的记录为定量气候重建提供了最可靠的数据，但这种记录通常仅限于陆地区域或热带海洋。这项由爱荷华州立大学和缅因州大学的科学家合作的研究使用了对长寿双壳类北极岛贝类生长增量的硬化年代学分析，以生成缅因湾过去1000年来每年可分辨的温度记录。PIs探讨了NAO模式、NAO极值、海水温度、贝壳生长速度和化学之间的具体关系，以及缅因湾海洋气候系统对过去一千年快速气候变化的反应。这项研究的结果揭示了这个将在21世纪影响大量人口的地区的气候变化。研究生和本科生参与了这项研究，PI正在与各种地区研究中心合作，以互动展示突出这项研究。

Reconstructing and understanding the spatiotemporal patterns of late Holocene climate variability remains a fundamental challenge in paleoclimatology, particularly with respect to coupled systems such as the North Atlantic Oscillation (NAO) and the Atlantic meridional overturning circulation (AMOC). Records with absolute chronologies on annual or better timescales have offered the most robust data for quantitative climate reconstructions, however such records are generally limited to terrestrial regions or the tropical oceans. This collaborative research between scientists from Iowa State University and the University of Maine uses sclerochronological analysis of the growth increments of the long-lived bivalve Arctica islandica to generate annually resolved records of temperature in the Gulf of Maine covering the last 1000 years. The PIs explore the specific relationship among the NAO mode, NAO extremes, seawater temperature, and shell growth rate and chemistry, as well as the response of the ocean-climate system in the Gulf of Maine to rapid climate changes during the last millennium. The results from this research shed light on climate change in a region that will affect large populations in the 21st century. Graduate and undergraduate students are participating in the research, and the PIs are working with a variety of regional research centers to interactive displays highlighting the research.