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

该项目的目标是整合高分辨率沉积记录，以评估过去3.5 myr期间东北印度洋的古海洋和古气候变化。利用ODP Site 758的沉积剖面，PI将合成稳定同位素CaCO3、有孔虫动物组合、体积磁化率、陆源浓度和粒度的记录。这些数据将有助于记录：1)季风变化；2)海表温度和盐度的空间梯度；3)表层到深水的营养物浓度梯度；4)冰期/间冰期波动的区域海洋学和气候效应；5)考虑到喜马拉雅-青藏高原地区近期地质快速隆升的陆源聚集。孟加拉湾晚中新世以来CaCO3的长期下降和磁化率的增加初步归因于这一隆升。

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.