Millennial variations in Arabian Sea sediment proxies: the connection to North Atlantic climate

阿拉伯海沉积物代理的千年变化：与北大西洋气候的联系

• 批准号: 0646817
• 负责人: Franco Marcantonio
• 金额: $ 1.35万
• 依托单位: Texas A&M Research Foundation
• 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: 2006-07-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0646817&HistoricalAwards=false
• 关键词: Millennial; variations; Arabian; Sea; sediment

Under this award the PIs will use a variety of paleoproductivity proxies to test the hypothesis that millennial changes in OMZ intensity in the Arabian Sea are directly related to changes in the intensity of upwelling-favorable winds associated with the SW Indian Ocean monsoon. To reconstruct export production on stadial/interstadial timescales in the Arabian Sea the PIs will measure at high-resolution the 230Th-derived accumulation rates of total organic carbon and total C37-alkenones, the authigenic uranium concentration, and the xs231Pa/xs230Th ratio. The alkenone unsaturation ratio (Uk. 37) will be used to reconstruct past sea-surface temperatures (SSTs) on stadial/interstadial timescales. Results of this work will improve understanding of 1) the teleconnections linking climate variability in the Arabian Sea to well-established records in the high-latitude North Atlantic region, 2) proxies of export production in sediments, and 3) the relationship between SST and the dynamics of the Indian Ocean monsoon system.

根据该奖项，PI 将使用各种古生产力指标来检验以下假设：阿拉伯海 OMZ 强度的千禧年变化与西南印度洋季风相关的上升流有利风强度的变化直接相关。 为了重建阿拉伯海场间/场间时间尺度的出口生产，PI 将以高分辨率测量 230Th 衍生的总有机碳和总 C37-烯酮的积累率、自生铀浓度以及 xs231Pa/xs230Th 比率。 烯酮不饱和比（Uk. 37）将用于在场域/场间时间尺度上重建过去的海面温度（SST）。这项工作的结果将增进对以下方面的理解：1) 将阿拉伯海气候变化与北大西洋高纬度地区既定记录联系起来的遥相关；2) 沉积物出口生产的代理；以及 3) 海表温度和海温之间的关系。印度洋季风系统的动力学。