SGER: Exploratory seismic reflection and gravity coring survey of Lakes Mantano and Towuti, Indonesia

SGER：印度尼西亚曼塔诺湖和托乌提湖的地震反射和重力取芯勘探

• 批准号: 0627803
• 负责人: James Russell
• 金额: --
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0627803&HistoricalAwards=false
• 关键词: SGER; Exploratory; seismic; reflection; gravity

This Small Grant for Exploratory Research (SGER) supports a seismic reflection and gravity coring survey of two large tectonic lakes on the island of Sulawesi, Indonesia: Lakes Mantano and Towuti. Although limnologic and meterologic data suggest that both lakes should be sensitive to El Nino Southern Oscillation-driven (ENSO) climate changes, virtually nothing is known about sedimentation in the lakes nor their environmental histories. The research will explore the potential of the two lakes for paleoclimate research using seismic reflection and gravity coring methods, leveraging support from Canadian and Indonesian scientific partners and industry. The overarching goal is to gain new insight into the Pleistocene and Holocene history of ENSO using lake-based climate reconstruction in Indonesia. This exploratory research represents a first step toward that goal: an expedition to Lakes Mantano and Towuti, Indonesia. The team will collect about 500 km of high- and intermediate-resolution seismic reflection data and a suite of gravity core and grab samples, and conduct a small laboratory program to investigate sediment samples and sedimentary environments in the two lakes. Specifically, seismic data and core samples will be used to:1) Identify erosional unconformities and other stratigraphic surfaces that could indicate the depthof major lake level changes2) Investigate modern patterns of sedimentation in the lakes to identify promising sites for longpiston coring to be supported by future proposals3) Calibrate geochemical and organic geochemical proxies4) Develop preliminary records of recent environmental changes in the two lakes. Although highly exploratory, the work should catalyze significant future research on Indonesian climate and environmental history using lake sediments.Intellectual merits: ENSO is a phenomenon of global interest, but our understanding of ENSO variability at timescales of decades to millennia is poor. This study will provide a preliminary but extremely valuable record of lake lowstands and drought from Indonesia, contributing to several areas of special emphasis within the US Climate Change Science Program. Moreover, this research represents the first systematic paleoclimate study of Indonesian large lakes, and Lakes Mantano and Towuti could eventually provide unparalleled records of Indonesian climate history and ENSO variability.Broader Impacts: This study will promote a broad, international collaboration between US, Indonesian, and Canadian scientists working on Indonesian lakes. Gravity cores collected will form the basis for senior research theses at Brown University, and will provide a basis for reconstructing ENSO-driven drought in Indonesia, critical to evaluating water resources for agriculture and hydroelectric utilization in one of the most densely populated countries in the world.

这笔小额勘探研究补助金(SGER)支持对印度尼西亚苏拉威西岛上的两个大型构造湖泊：曼塔诺湖和托武提湖进行地震反射和重力取心调查。尽管湖沼学和气象学数据表明，这两个湖泊应该对厄尔尼诺-南方涛动(ENSO)气候变化很敏感，但实际上对这些湖泊的沉积作用及其环境历史知之甚少。这项研究将利用加拿大和印度尼西亚的科学伙伴和工业界的支持，利用地震反射和重力取心方法，探索这两个湖泊在古气候研究方面的潜力。总体目标是通过印度尼西亚基于湖泊的气候重建，获得对更新世和全新世ENSO历史的新见解。这项探索性研究代表着朝着这一目标迈出的第一步：前往印度尼西亚的曼塔诺湖和托武提湖进行探险。该团队将收集约500公里的高、中分辨率地震反射数据和一套重力岩心和抓取样本，并实施一个小型实验室计划，以调查两个湖泊的沉积物样本和沉积环境。具体地说，地震数据和岩心样本将被用于：1)识别侵蚀不整合和其他可能指示主要湖平面变化深度的地层面；2)调查湖泊中的现代沉积模式，以确定有希望的长活塞取心地点，以得到未来提议的支持；3)校准地球化学和有机地球化学试剂4)建立两个湖泊最近环境变化的初步记录。尽管这项工作具有很高的探索性，但这项工作应该会促进未来利用湖泊沉积物对印度尼西亚气候和环境历史的重大研究。智力上的优点：ENSO是一种全球感兴趣的现象，但我们对ENSO在几十年到几千年时间尺度上的变化的了解很差。这项研究将提供印度尼西亚湖泊低水位和干旱的初步但极其有价值的记录，有助于美国气候变化科学计划中的几个特别重视的领域。此外，这项研究代表了印尼大型湖泊的第一次系统的古气候研究，Mantano湖和Towuti湖最终可能提供无与伦比的印尼气候历史和ENSO变化的记录。广泛的影响：这项研究将促进美国、印度尼西亚和加拿大科学家之间广泛的国际合作。收集到的重力岩芯将构成布朗大学高级研究论文的基础，并将为重建印度尼西亚由ENSO引发的干旱提供基础，这对评估世界上人口最稠密的国家之一的农业和水电利用水资源至关重要。