The equatorial Pacific record of Earth's climate and paleoceanography; site-survey support for IODP-626FULL2.

太平洋深处营养丰富的海水沿着赤道上升，为浮游生物的密集种群提供了基础。在过去的5000万年里，它们的骨架形成了一个600米厚的沉积物丘。我们的目标是在这些沉积物中钻一系列的孔，并将它们组合起来，以提供它们在赤道沉积的连续记录。由于太平洋海水的上涌与风力有关，这些沉积物携带着地球气候的重要记录。该提案要求为收集地球物理数据和岩心提供资金，以验证这些地点是安全的，可以进行钻探，并确定合适的沉积物部分进行取样。一名博士生将有机会分析地震数据，并建立一个覆盖整个太平洋中部的沉积物分层数据库。他/她将研究这些数据，以计算出沉积物在山丘周围的变化以及流动的底部水的影响。他/她将研究碳酸盐物质的溶解如何改变沉积物。这里收集的沉积物样本也将用于分析最近冰期-间冰期气候波动的信号。

Deep nutrient-rich waters of the Pacific Ocean rise up along the equator and provide the basis for dense populations of planktonic organisms. Their skeletons have built up over the past 50 million years to create a 600-m-thick mound of sediments. We aim to drill a series of holes through these deposits and combine them to provide a continuous record of their deposition at the equator. As the upwelling of the Pacific Ocean water is related to wind strength, these deposits carry an important record of Earth's climate. This proposal requests funding to collect geophysical data and cores to verify that these sites are safe to drill and to locate suitable sediment sections to sample. A PhD student will have the opportunity to analyse the seismic data and to develop a database of sediment layering throughout the entire central Pacific Ocean. He/she will study these data to work out how the deposits vary around hills and with effects of flowing bottom waters. He/she will study how dissolution of carbonate material has modified the sediments. The sediment samples collected here will also be analysed for signals of recent glacial-interglacial climate fluctuations.