Testing the Hypothesis: Recurring Century-Length Episodes of Reduced Summer Monsoon Precipitation Are Linked to Ocean/Atmosphere Dynamics in the Tropical Pacific

检验假设：反复出现的长达一个世纪的夏季季风降水减少与热带太平洋的海洋/大气动力学有关

• 批准号: 0502615
• 负责人: Lowell Stott
• 金额: $ 44.86万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-15 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0502615&HistoricalAwards=false
• 关键词: Testing; Hypothesis; Recurring; Century; Length

This award extends the proxy data base of tropical Pacific ocean-atmospheric variability and monsoon variability in order to investigate whether, on longer time scales, there has been a persistent coupling between the tropical Ocean and monsoons of India and China. The research is a continuation of a project begun two years ago by this group to reconstruct high resolution (decadal resolution) precipitation histories for the monsoon regions through analyses of oxygen isotopes in dated speleothems collected in India and China and compare these to high resolution (multi-decadal resolution) proxy records of sea surface temperature and precipitation variability in Indonesia. The climate thesis at the core of the research is that a centennial and a millennial-length pattern of ocean-atmospheric variability exists within the tropical Pacific and Indian Oceans that involves shifts the locus of warm waters and the strength of atmospheric convection over Indonesia and sea surface temperature gradients in the Indian Ocean and this variability is associated with varying strength of summer precipitation falling on the core monsoon regions of India and China. The researchers are pursuing the following research questions:- Has there been a persistent pattern of centennial-scale climate (SST) variability in the western tropical Pacific and Indian Ocean that is associated with variable precipitation over the monsoon regions of India and China?- Is there a persistent pattern of drought recurrence in the Indian and Asian monsoon rainfall?- Were major cultural events in India and China associated with sustained or exceptional droughts?The researchers will address these questions by expanding the reconstruction of western tropical Pacific and Indian Ocean sea surface temperature changes, developing composite speleothem oxygen isotope records of Indian and Asian monsoon variability, and conducting time series analysis and inter-comparisons of Holocene millennial-scale climate records.The data gained from this research will aid the understanding of the climatology of a large-scale atmospheric feature (Asian monsoon) that has significant impact on a densely populated region. The project has a strong international collaborative education and research component that includes support for research and postdoctoral scholars and active participation by scientists and students in China, India, and Taiwan.

该奖项扩展了热带太平洋-大气变率和季风变率的代理数据库，以便研究在更长的时间尺度上，热带海洋与​​印度和中国的季风之间是否存在持续的耦合。这项研究是该小组两年前开始的一个项目的延续，该项目旨在通过分析在印度和中国收集的测年洞穴中的氧同位素，重建季风地区的高分辨率（十年分辨率）降水历史，并将其与高分辨率（多分辨率）降水历史进行比较。 -十年分辨率）印度尼西亚海面温度和降水变化的代理记录。该研究的核心气候论点是，热带太平洋和印度洋内存在百年和千年的海洋-大气变化模式，涉及温暖水域的位置以及印度尼西亚和海洋上空对流强度的变化印度洋表面温度梯度的变化与印度和中国核心季风区夏季降水强度的变化有关。研究人员正在研究以下研究问题： - 西热带太平洋和印度洋是否存在与印度和中国季风区降水变化相关的百年尺度气候（SST）持续变化模式？印度和亚洲季风降雨是否存在持续的干旱复发模式？ - 印度和中国的重大文化事件是否与持续或异常干旱有关？研究人员将通过扩大西热带太平洋和印度洋海面的重建来解决这些问题温度变化，开发复合材料印度和亚洲季风变化的洞穴氧同位素记录，并对全新世千年尺度气候记录进行时间序列分析和相互比较。这项研究获得的数据将有助于了解大尺度大气特征（亚洲）的气候学。季风）对人口稠密地区产生重大影响。 该项目具有强大的国际合作教育和研究成分，包括对研究和博士后学者的支持以及中国、印度和台湾科学家和学生的积极参与。