Collaborative Research: Integrating proxies and Earth System Models to elucidate water cycle dynamics:Did global warming cause an enhanced hydrological cycle in the Eocene?

该奖项是根据2009年美国复苏和再投资法案(公法111-5)资助的。全球变暖是否增加了水文循环的活力？这一问题构成了这项研究的总体研究主题，它使用代理重建和地球系统模型相结合的方式调查水文循环反馈在气候变化中的作用。PI侧重于早古近纪，特别是极端气候时期，如早、中期始新世气候最佳时期和始新世-渐新世过渡时期。将讨论的相关问题是：1)全球变暖是否与哈德利环流和副热带干旱地区的显著极地扩张有关？2)中纬度风暴路径是否伴随着降水、水汽和潜热向极地移动？3)大气水分输送和径流的变化是否会改变海洋深水形成和经向翻转？PIS还将解决始新世古气候研究的具体问题。更广泛的影响包括强大的社会相关性，教育项目，包括将研究纳入古气候乌尔比诺暑期学校，扩大到STEM项目，以及培训3名博士生。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Does global warming increase the vigor of the hydrological cycle? This question forms the overall research theme of this study, which investigates the role of hydrological cycle feedbacks in climate change using a combination of proxy reconstructions and Earth System Models. The PIs focus on the early Paleogene, particularly on periods of extreme climate such as the Early and Middle Eocene Climatic Optima and the Eocene-Oligocene transition. Related questions that will be addressed are: 1) Is global warming associated with substantial poleward extension of the Hadley circulation and subtropical dry zones?, 2) Do mid-latitude storm tracks move poleward carrying precipitation, water vapor, and latent heat with them?, and 3) Do changes in the atmospheric water transport and runoff alter oceanic deep water formation and meridional overturning? The PIs will also address questions specific to Eocene paleoclimate studies. Broader impacts include strong societal relevance, education programs including integration of the research into the Urbino Summer School in Paleoclimate and outreach to STEM programs, and training of 3 PhD students.