EAPSI: Sea-level and paleoclimate reconstructions from Mallorca Cave Deposits

气候引起的海平面上升对沿海社会的潜在影响是一个紧迫的全球问题。了解海平面对气候变化的反应的最佳方法是观察这些过程在过去是如何进行的。这项研究的目的是生产和联合收割机高分辨率的气候和海平面记录，以便解释如何海平面响应气候变化已在晚更新世的时间。这两个记录将产生关于海平面如何随着地中海北方主要冰盖的增长和衰减而上升和下降的直接信息。 在沈传洲博士的监督下，这个项目将在台湾国立大学进行。 沈博士负责改进质谱测年方法的分析精度，使辐射测年的误差最小。在地中海海平面的上方、下方和当前海平面上记录了碳酸盐结壳（CE），而来自同一洞穴的石笋可以使用U系列方法精确测年，从而精确地限制了每个海平面的海拔高度和该地区的气候历史。由于其生长机制与地球的大气圈和水圈有关，洞穴沉积物对气候变化很敏感。在同位素平衡条件下沉积的洞穴沉积物，其氧、碳同位素沿着生长轴的变化是气候变化的潜在的强有力的示踪剂。先前通过多收集器电感耦合等离子体质谱仪从马略卡岛收集的十五颗CE和两颗石笋的测年将用于产生年龄。高分辨率U/Th年代学的两个石笋和精确定年CE将提供过去的海平面高，低的立场和气候变化的时间表。这个NSF EAPSI奖是与台湾国家科学理事会合作资助的。

The potential impacts of climate induced sea level rise on coastal societies are a pressing global issue. The best way to understand sea level responses to climate change is to observe how the processes have proceeded in the past. This research aims to produce and combine high-resolution climate and sea level records so that an interpretation of how the sea level response to climate variation has operated during Late Pleistocene time. The two records will produce direct information on how sea level rose and fell in response to the growth and decay of the major northern hemisphere ice sheets in the Mediterranean. Under the supervision of Dr. Chuan-Chou Shen, this project will be conducted at the National University of Taiwan. Dr. Shen is responsible for the refined analytical precision of mass spectrometric dating methods that will allow for radiometric ages with minimal error.Carbonate encrustations (CE) are documented above, below, and at the current Mediterranean sea level and stalagmites from the same caves can be accurately dated using U-series methodology, thus precisely constraining the elevation of each sea-level stand and a climate history for the region. Speleothems are sensitive to climate changes as their growth mechanism is linked to Earth's atmosphere and hydrosphere. Oxygen and carbon isotopic variations along the growth axis of a given speleothem deposited under isotopic equilibrium conditions are potentially powerful tracers of climatic changes. Dating of fifteen CE and two stalagmites previously collected from Mallorca by means of Multi Collector-Inductively Coupled Plasma Mass Spectrometer will be used to generate ages. The high resolution U/Th chronology of the two stalagmites and the precisely dated CE will provide timelines for past sea level high and low stands and climate variability. This NSF EAPSI award is funded in collaboration with the National Science Council of Taiwan.