REU: History of Southern Hemisphere Atmospheric Circulation:The Indian Ocean Record

本项目将建立全新生代风成记录， 印度东部ODP第121航次钻井现场的沉积物 海洋 这些记录将揭示地质构造的历史 南半球大气环流的时间尺度 强度和模式的大陆（主要是澳大利亚） 干旱 进一步的数据将连接整个晚白垩世 到最近的风成记录到海洋的历史， 基于同位素和其他代用指标的冰冻圈 从同一个岩芯有时是同一个样本中确定的 有几个具体的问题或事件， 研究了 第一个是任何变化的性质 在穿越第三纪的大气环流中 边界 第二，为了描绘南半球 记录了大气环流的重要变化， 发生在古新世-始新世的北方半球 边界 第三，研究南方的重大变化。 半球的大气环流 始新世末-渐新世初的极地冷却， 南极冰量的变化。 在这方面， 风的强度是行星 温度梯度意味着数据将进一步 对冰量与温度讨论的限制。 %%% 过去6000万年来古气候变化的影响 大气环流的年数可由 深海中风吹颗粒的变化模式 沉积物 该项目将利用风成材料， 从印度洋钻取岩芯来推断风向的变化 可能与气候变化有关的模式。 因为 大气对气候非常敏感，这些古环流 结果将提供一个监测古气候变化的 南半球 这个信息将非常重要 在印度洋对南极的反应的模拟研究中， 冰川作用，青藏高原隆升， 北方冰川作用

This project will construct whole-Cenozoic record of eolian deposition from ODP Leg 121 drillsites in the eastern Indian Ocean. That record will reveal the history, on tectonic timescales, of Southern Hemisphere atmospheric circulation intensity and of patterns of continental (largely Australian) aridity. Further the data will link the entire late Cretaceous to recent eolian record to the history of the ocean and cryosphere based on isotopic and other proxy indicators determined from the same core, and sometimes the same samples. There are several specific questions or events to be investigated. The first of these is the nature of any changes in atmospheric circulation across the Cretaceous-Tertiary boundary. Secondly, to delineate the Southern Hemisphere record of the important change in atmospheric circulation that occurs in the Northern Hemisphere at the Paleocene-Eocene boundary. Third, examine significant changes in Southern Hemisphere atmospheric circulation that occur in conjunction with the latest Eocene - early Oligocene polar cooling and changes in Antarctic ice volume. In this regard the fact that wind intensity is another indication of the planetary temperature gradient means that the data will place further constraints on the ice-volume vs. temperature discussions. %%% The effects of paleoclimatic changes during the last 60 million years on atmospheric circulation may be determined from changing patterns of wind-blown particles in deep-sea sediments. This project will utilize the eolian material in drill cores from the Indian Ocean to infer shifting wind patterns that may be linked to climate changes. Because the atmosphere is very sensitive to climate, these paleocirculation results will provide a monitor of paleoclimatic changes in the Southern Hemisphere. This information will be very important in modelling studies of the Indian Ocean response to Antarctic glaciation, uplift of the Tibetan Plateau, and the effect of the Northern hemisphere glaciation.