Deep Ocean Sensitivity to, and Role in the Transition from mid-Pliocene Warmth to Northern Hemisphere Glaciation

温暖的上新世中期，全球平均温度比现在高2-3摄氏度，在政府间气候变化专门委员会（IPCC）对21世纪全球变暖的预测范围内，因此为未来的气候变化提供了一个很好的模拟。这项工作由罗格斯大学（Rutgers University）的一组科学家进行，将从深海沉积物岩心中产生新的地球化学代用记录（Mg/Ca、B/Ca和钕同位素组成），这将为从上新世中期暖期到北半球冰期开始（距今约250万至350万年）过渡期间大西洋、太平洋和南大洋深海水文的时空变化提供关键限制。新的记录将提高我们对深海对上新世中期变暖的响应的理解，并为海洋对变暖/更高二氧化碳分压条件的敏感性以及随后向北半球整体变冷气候过渡的过程提供有价值的见解。除了更好地了解过去与现代条件下海洋和气候之间的联系外，更广泛的影响还包括教育和培训女性博士后研究员，以及为本科生提供研究机会。研究结果将在讨论会、国家专业会议上提出，并纳入本科和研究生的教学课程。这项研究产生的数据集将通过NOAA-NCDC网站提供。

The warm mid-Pliocene, when on average global temperature was 2-3 degrees C warmer than at present, is within the range of the Intergovernmental Panel on Climate Change (IPCC) projections of global warming for the 21st century, and hence offers a good analog for future climate change. This work, conducted by a team of scientists from Rutgers University, will generate new geochemical proxy records (Mg/Ca, B/Ca, and Neodymium isotope composition) from deep sea sediment cores that will provide key constraints on spatial and temporal variations in the deep ocean hydrography in the Atlantic, Pacific, and Southern Oceans during the transition from the mid-Pliocene warm period to the onset of Northern Hemisphere glaciation (~2.5 to 3.5 million years before present). The new records will improve our understanding of the response of the deep ocean to the mid-Pliocene warmth and provide valuable insights into the ocean sensitivity to warmer/higher pCO2 conditions and during the subsequent transition to overall cooler climates in the Northern Hemisphere.In addition to better understanding links between the oceans and climate in a past analog to modern conditions, broader impacts include education and training of a female post-doctoral fellow and research opportunities for undergraduate students. The results will be presented in seminars, at national professional meetings, and incorporated into teaching curricula at undergraduate and graduate levels. The datasets generated in this research will be made available through the NOAA-NCDC web site.