IODP Expedition 325: Great Barrier Reefs Reveals Past Sea-Level, Climate and Environmental Changes Since the Last Ice Age
IODP Expedition 325: Great Barrier Reefs Reveals Past Sea-Level, Climate and Environmental Changes Since the Last Ice Age
复制标题
DOI：
10.2204/iodp.sd.12.04.2011
复制
发表时间：
2011-09
影响因子：
1.2
通讯作者：
C. Cotterill;Juan Carlos Braga;L. Jovane;Heath Mills;Sally Morgan;A. Suzuki
中科院分区：
文献类型：
--
作者：
C. Cotterill;Juan Carlos Braga;L. Jovane;Heath Mills;Sally Morgan;A. Suzuki
摘要。冰川消融的时间和过程是了解全球气候系统的关键组成部分。在过去的200万年里，随着高纬度冰盖的增长和衰退，全球气候发生了周期性变化。据信，这些波动主要是由地球绕太阳轨道的变化引起的入射太阳辐射的周期性变化所控制的。然而，并不是所有的气候变化都可以用这一过程来解释，人们越来越意识到内部气候反馈机制的重要作用。了解这些反馈在全球海平面和气候突变时间方面的本质是至关重要的。热带海洋是反馈系统的主要组成部分之一，因此重建海表条件的时间变化将大大提高我们对气候系统的理解。综合海洋钻探计划（IODP）第325远征队在澳大利亚大堡礁的17个地点钻了34个洞，以回收化石珊瑚礁沉积物。这次考察的主要目的是了解在最后一个冰期和随后的冰川消退期间发生的环境变化，更具体地说：(1)确定海平面变化的过程，(2)重建海洋条件，(3)确定珊瑚礁对这些变化的反应。我们从水深126米的地方恢复了珊瑚礁沉积物，这些沉积物的年龄从9000年到3万年前不等。考虑到这些年代材料的间隔涵盖了几个古气候学上的重要事件，包括末次盛冰期，我们期望正在进行的科学分析将实现这次考察的目标。doi: 10.2204 / iodp.sd.12.04.2011
Abstract. The timing and courses of deglaciations are key components in understanding the global climate system. Cyclic changes in global climate have occurred, with growth and decay of high latitude ice sheets, for the last two million years. It is believed that these fluctuations are mainly controlled by periodic changes to incoming solar radiation due to the changes in Earth’s orbit around the sun. However, not all climate variations can be explained by this process, and there is the growing awareness of the important role of internal climate feedback mechanisms. Understanding the nature of these feedbacks with regard to the timing of abrupt global sea-level and climate changes is of prime importance. The tropical ocean is one of the major components of the feedback system, and hence reconstructions of temporal variations in sea-surface conditions will greatly improve our understanding of the climate system. The Integrated Ocean Drilling Program (IODP) Expedition 325 drilled 34 holes across 17 sites in the Great Barrier Reef, Australia to recover fossil coral reef deposits. The main aim of the expedition was to understand the environmental changes that occurred during the last ice age and subsequent deglaciation, and more specifically (1) establish the course of sea-level change, (2) reconstruct the oceanographic conditions, and (3) determine the response of the reef to these changes. We recovered coral reef deposits from water depths down to 126 m that ranged in age from 9,000 years to older than 30,000 years ago. Given that the interval of the dated materials covers several paleoclimatologically important events, including the Last Glacial Maximum, we expect that ongoing scientific analyses will fulfill the objectives of the expedition. doi: 10.2204/iodp.sd.12.04.2011