Miocene development of the Asian monsoon and oceanographic response in the Bay of Bengal

亚洲季风中新世的发展和孟加拉湾的海洋响应

• 批准号: NE/N004795/1
• 负责人: Sev Kender
• 金额: $ 6.88万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2015
• 资助国家: 英国
• 起止时间: 2015 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FN004795%2F1
• 关键词: Miocene; development; Asian; monsoon; oceanographic

The Mid Miocene Climate Transition (MMCT, ~13.8 Ma) was an abrupt and permanent episode of global cooling, Antarctic ice sheet expansion and global biotic changes that have been linked by some to erosion and weathering of the Himalaya (e.g. Clift et al. 2008; Armstrong et al. 2011; Kender et al. 2014). The proposed research, to be carried out by PDRA Fox at the University of Nottingham, on new cores collected during IODP Expedition 354 (Bengal Fan), will provide vital information on palaeoceanographic changes in the Bay of Bengal during the mid Miocene including the MMCT (13-16 Ma), and shed new light on the evolution of the Asian monsoon system that affects both the oceanography of this system and Himalayan erosion. In addition to testing the hypothesis of enhanced erosion of the Himalaya at this time, the results of the proposed investigation will provide crucial information for the IODP objective of understanding how the Himalayan-Tibet orogenesis interacted with the Earth's climate over this important interval. This includes forcing of the climate due to palaeoceanographic evolution and atmospheric CO2 uptake, as well as retroaction of the monsoonal climate on the tectonic region via erosion (France-Lanord et al., 2014; Kender et al. 2014). We propose to tackle these hypotheses through high resolution planktonic foraminiferal stable isotope (d18O and d13C) and trace metal (e.g. Mg/Ca) analyses.

中新世中期气候转变（MMCT，~13.8 Ma）是全球变冷、南极冰盖扩张和全球生物变化的突然和永久事件，有些人认为这与喜马拉雅山的侵蚀和风化有关（例如Clift等人，2008年; Armstrong等人，2011年; Kender等人，2014年）。拟议的研究将由诺丁汉大学的PDRA Fox对IODP第354次考察期间收集的新岩心进行（孟加拉扇），将提供重要的信息，古海洋学变化在孟加拉湾在中新世中期，包括MMCT（13-16马），并揭示了亚洲季风系统的演变，影响这一系统的海洋学和喜马拉雅侵蚀。除了测试喜马拉雅山在这个时候增强侵蚀的假设，拟议的调查结果将提供关键信息的IODP的目标，了解喜马拉雅山-西藏造山作用如何与地球的气候在这个重要的间隔。这包括古海洋学演变和大气CO2吸收对气候的强迫，以及季风气候通过侵蚀对构造区域的反作用（France-Lanord等人，2014; Kender等人，2014）。我们建议通过高分辨率的浮游有孔虫稳定同位素（d18 O和d13 C）和微量金属（如Mg/Ca）分析来解决这些假设。