Collaborative Research: Nested GCM/Mesoscale Model Studies of Large, Rapid Holocene and Late-Glacial Climate Changes: Synthesis with the Greenland Ice Core Records

ALLEY, RICHARD FAWCETT， PETER宾夕法尼亚州立大学新墨西哥州立大学本研究项目使用中尺度气候模式结合环流模式（GCM）来研究北半球古气候记录中发现的两次极快速冷却的原因。这些冷却现象不能用主要冰期的相同机制来解释，而冰期是气候变化发生方式的重要线索。建模工作将使用最近从格陵兰冰盖项目中恢复的古气候记录进行验证，这些记录来自格陵兰冰盖顶部附近的两个冰芯。本研究的结果将增强对气候系统反馈机制的认识，该机制可能会导致北半球温度的快速急剧变化和全球海平面下降，从而影响世界各地的人类活动。

ABSTRACT OPP-9614927 OPP-9614907 ALLEY, RICHARD FAWCETT, PETER PENNSYLVANIA STATE UNIVERSITY NEW MEXICO STATE UNIVERSITY This research project uses a mesoscale climate model in conjunction with a General Circulation Model (GCM) to examine the cause of two extremely rapid coolings that have been found in paleoclimate records of the Northern Hemisphere. Those coolings cannot be explained by the same mechanisms that account for the major glacial episodes and represent an important clue to the way that climate change occurs. The modeling effort will be validated using the paleoclimate record recovered recently from the Greenland Ice Sheet Project Two ice cores taken near the summit of the Greenland ice cap. The results of this study will enhance the knowledge of climate system feedback mechanisms that could produce a rapid, dramatic shift in Northern Hemisphere temperatures and a drop in global sealevel that would affect human activities around the world.