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

PECASE：古厄尔尼诺南方涛动 (ENSO) 和 20 世纪校准的高分辨率马来西亚洞穴记录

• 批准号: 0645291
• 负责人: Kim Cobb
• 金额: $ 61.08万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-02-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0645291&HistoricalAwards=false
• 关键词: PECASE; resolution; Malaysian; Speleothem; Records

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."

这项PECASE奖的资金将使用从婆罗洲洞穴中收集的快速生长的洞穴沉积物来生成自公元500年以来西太平洋暖池降水的季节性解析代理记录。到现在上一个千年是一个有用的时期，可以合并代用数据和模式数据，以了解全球气候系统对辐射强迫的反应。热带太平洋洞穴沉积物有潜力提供次年度分辨率的降水记录，能够解决过去数千年的厄尔尼诺/南方涛动和低频气候变率，但这种潜力在很大程度上尚未开发。具体来说，研究人员将比较高分辨率洞穴沉积物氧-18，碳-13和镁/方解石比率时间序列与过去150年的仪器气候记录，以重建厄尔尼诺/南方涛动（ENSO）事件和过去1500年的热带太平洋气候。这个PECASE奖的一个关键方面是将由此产生的洞穴沉积物地球化学代理记录的解释放在当地天气，降雨氧-18，滴水氧-18，碳-13，镁/方解石比和滴水率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影响的热带地区区域尺度气候，降雨氧-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率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ENSO变率方面可能是前所未有的（或不是）。该项目包括一个广泛的教育倡议，旨在建立和保持地球和大气科学（EAS），米勒格罗夫公立高中，和天气频道（TWC）的格鲁吉亚理工学院之间的密切联系。与米勒格罗夫科学教师密切合作，研究人员的努力将包括气候课程开发与实践科学活动，包括实地考察当地洞穴和广播演播室在TWC。研究人员将利用与TWC的新合作，通过TWC实习和题为“气候变化与媒体”的EAS研讨会，使本科生和研究生接触到气候变化研究与大众媒体的交叉点。"