Plio-Pleistocene Oceanography and Climatology of the Northeastern Indian Ocean: Implications for Monsoon Variability

东北印度洋的上更新世海洋学和气候学：对季风变化的影响

• 批准号: 8911874
• 负责人: David Murray
• 金额: $ 20万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-15 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8911874&HistoricalAwards=false
• 关键词: Plio; Pleistocene; Oceanography; Climatology; Northeastern

The goal of the project is to integrate high resolution sedimentary records to assess paleoceanographic and paleoclimatic change in the northeastern Indian Ocean during the last 3.5 myr. Using the sedimentary section from ODP Site 758 the PI will synthesize records of stable isotopes CaCO3, foraminiferal faunal assemblages, volume magnetic susceptibility, and terrigenous concentration and grain size. These data will allow to document: 1) monsoon variability; 2) spatial gradients in sea-surface temperature and salinity, 3) surface-to-deep water gradients in nutrient concentration; 4) the regional oceanographic and climatic effects of glacial/interglacial fluctuations; and 5) terrigenous accumulation in light of the geologically recent and rapid uplift of the Himalayan-Tibetan Plateau region. The long-term decrease %CaCO3 and increase in magnetic susceptibility observed since the Late Miocene in the Bay of Bengal is tentatively attributed to this uplift.

该项目的目标是集成高分辨率 沉积记录，以评估古海洋学和 2000年印度洋东北部古气候变化 最后的350万年 利用ODP现场的沉积剖面 758 PI将合成稳定同位素CaCO 3的记录， 有孔虫动物群组合，体积磁性 磁化率、陆源浓度和粒度。 这些数据将允许记录：1）季风变化; 2） 海洋表面温度和盐度的空间梯度，3） 表层至深层营养盐浓度梯度; 4） 区域海洋学和气候影响 冰期/间冰期波动; 5）陆源 根据地质上最近和快速的积累， 喜马拉雅-青藏高原地区的隆升。 长期 降低%CaCO3和增加磁化率 晚中新世以来在孟加拉湾观察到的 暂时归因于这次隆升。