PECASE: High-resolution Malaysian Speleothem Records of Paleo-El Nino-Southern Oscillation (ENSO) and 20th Century Calibration

这项PECASE奖项的资金将使用从婆罗洲洞穴收集的快速增长的洞穴化石来生成从公元500年到现在的西太平洋暖池降水的季节性解析替代记录。上个千年是合并代理数据和模式数据以了解全球气候系统对辐射强迫的反应的有用时间段。热带太平洋洞穴具有提供分年度分辨的降水记录的潜力，能够解决过去数千年来的ENSO和低频气候变化，但这种潜力在很大程度上仍未得到开发。具体地说，研究人员将把高分辨率洞穴氧-18、碳-13和镁/方解石比时间序列与过去150年的仪器气候记录进行比较，以重建过去1500年的厄尔尼诺/南方涛动(ENSO)事件和热带太平洋气候。PECASE奖的一个关键方面是将对由此产生的洞穴流地球化学替代记录的解释置于对当地天气、降雨量氧-18、滴水氧-18、碳-13、镁/方解石比率和滴速的现场监测的背景下。这些数据将使研究人员能够调查目前受ENSO影响的热带地区的区域尺度气候、降雨量、氧-18和滴水地球化学之间的现代关系。该项目的总体科学目标是调查热带太平洋气候变化在塑造上个千年全球气候模式中的可能作用，热带太平洋气候系统是否对辐射强迫作出反应，以及20世纪热带太平洋气候在多大程度上可能是前所未有的(或不是)ENSO变化。该项目包括一项广泛的教育倡议，旨在建立和保持佐治亚理工学院地球与大气科学学院(EAS)、米勒格罗夫公立高中和天气频道(TWC)之间的密切联系。这位研究人员将与米勒格罗夫的科学教师密切合作，通过亲身实践的科学活动来开发气候课程，包括实地考察当地的洞穴和TWC的广播演播室。这位研究人员将利用与TWC的新合作，通过TWC的实习和名为“气候变化与媒体”的EAS研讨会，让本科生和研究生接触到气候变化研究和大众媒体的交集。

Funding for this PECASE award will use fast-growing speleothems collected from caves in Borneo to generate seasonally-resolved proxy records of West Pacific Warm Pool precipitation from 500A.D. to the present. The last millennium is a useful time period for merging proxy and model data towards understanding the response of the global climate system to radiative forcing. Tropical Pacific speleothems have the potential to provide sub-annually-resolved records of precipitation capable of resolving ENSO and low-frequency climate variability for thousands of years into the past, but this potential remains largely unexplored. Specifically, the researcher will compare high-resolution speleothem oxygen-18, carbon-13, and Magnesium/Calcite ratio timeseries to instrumental climate records over the last 150 to reconstruct El Nino/Southern Oscillation (ENSO) events and tropical Pacific climate over the last 1500yrs. A critical aspect of this PECASE award is to place the interpretation of the resulting speleothem geochemical proxy records in the context of on-site monitoring of local weather, rainfall oxygen-18, dripwater oxygen-18, carbon-13, Magnesium/Calcite ratios, and drip rate. This data will allow the researcher to investigate the modern day relationship between regional-scale climate, rainfall oxygen-18, and dripwater geochemistry at a tropical site currently affected by ENSO. The overall science goal of the project is to investigate the possible role of tropical Pacific climate variability in shaping global climate patterns of the last millennium, whether the tropical Pacific climate system responds to radiative forcing, and to what extent 20th century tropical Pacific climate may be unprecedented (or not) with respect to ENSO variability. The project includes a broad educational initiative aimed at building and maintaining close ties between Georgia Tech's School of Earth and Atmospheric Sciences (EAS), Miller Grove public high school, and The Weather Channel (TWC). Working closely with Miller Grove science teachers, the researcher's efforts will include climate curriculum development with hands-on scientific activities including fieldtrips to local caves and to the broadcast studios at TWC. The researcher will use new collaboration with TWC to expose undergraduate and graduate students to the intersection of climate change research and mass media through TWC internships and an EAS workshop titled "Climate Change and the Media."