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：
10.5194/sd-12-32-2011
复制
发表时间：
2011-09-01
影响因子：
1.2
通讯作者：
Suzuki, Atsushi
中科院分区：
文献类型：
--
作者：
Yokoyama, Yusuke;Webster, Jody;Suzuki, Atsushi
冰川消退的时间和过程是理解全球气候系统的关键组成部分。在过去的200万年里，随着高纬度冰盖的生长和衰退，全球气候发生了周期性的变化。据信，这些波动主要是由地球围绕太阳的轨道变化引起的太阳辐射的周期性变化所控制的。然而，并非所有的气候变化都可以用这一过程来解释，人们日益认识到内部气候反馈机制的重要作用。了解这些反馈对全球海平面和气候突变时间的影响至关重要。热带海洋是反馈系统的主要组成部分之一，因此重建海面条件的时间变化将大大提高我们对气候系统的理解。综合大洋钻探计划（IODP）第325远征队在澳大利亚大堡礁的17个地点钻了34个孔，以恢复珊瑚礁化石沉积物。这次考察的主要目的是了解最后一个冰河时代和随后的冰川消退期间发生的环境变化，更具体地说，（1）建立海平面变化的过程，（2）重建海洋学条件，（3）确定珊瑚礁对这些变化的反应。我们从水深至126米的水域中发现了珊瑚礁沉积物，其年龄从9,000年到30,000多年前不等。考虑到测年材料的时间间隔涵盖了几个古气候学上重要的事件，包括末次冰期最大期，我们预计正在进行的科学分析将实现探险的目标。
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.