A Role for the North Pacific Ocean in Deglacial Atmopsheric CO2 Rise?

目前，北太平洋是大气二氧化碳的来源之一，尽管海洋是人为二氧化碳排放的净汇。了解北太平洋对大气二氧化碳的贡献对于未来的气候预测是至关重要的。我们建议使用最后一次冰川-间冰期过渡作为评估海洋环流、营养物质可获得性/利用率和海洋生物生产力变化对大气二氧化碳的影响的手段。这项研究将提供洞察力和北太平洋在冰川储存和间冰期向大气释放碳方面的作用。我们的科学目标将通过利用亚极地-亚热带过渡带东北太平洋大陆边缘现有的五个海洋沉积物岩芯的多指标深度横断面方法来实现，这将整合新的和已建立的地球化学技术，使我们能够确定：1)最后一次冰川消融期间东北太平洋水柱的通风历史；2)营养物质在冰川-间冰期生产力信号中的作用。与使用更传统的单一地点或单一代理方法相比，这种综合方法确保了对最后一次冰川消融期间全球生物地球化学循环的更完整的了解。这项研究的结果将阐明北太平洋在重大气候过渡期间调节大气二氧化碳的作用。

At present the North Pacific Ocean is a source of atmospheric CO2, despite the ocean being a net sink of anthropogenic CO2 emissions. It is essential to future climate predictions to understand the North Pacific's contribution to atmospheric CO2. We propose to use the last glacial-interglacial transition as means of assessing the effects of changing ocean circulation, nutrient availability/utilization, and marine biologic productivity on atmospheric CO2. This research will provide insight and the role of the N Pacific in the glacial storage and interglacial release of carbon to the atmosphere. Our scientific aims will be achieved through a mutiproxy depth transect approach using five existing marine sediment cores from the NE Pacific continental margin within the subpolar-subtropical transition zone, which will integrate new and established geochemical techniques and allow us to determine: 1) the ventilation history of the NE Pacific water column over the last deglaciation., and 2) the role of nutrients in the glacial-interglacial productivity signal. This integrative approach ensures a more complete understanding of global biogeochemical cycling over the last deglaciation than is possible using a more traditional single site or single proxy approach. The outcomes of this research will illuminate the role of the North Pacific in regulating atmospheric CO2 during major climate transitions.