Evolution of the Indian summer monsoon and terrestrial vegetation in the Northeastern Indian region during the mid-Pleistocene transition (INTERMILAN)

中更新世过渡期间印度夏季季风和印度东北部地区陆地植被的演化（INTERMILAN）

• 批准号: 320220536
• 负责人: Dr. Ilham Bouimetarhan, Ph.D.
• 金额: --
• 依托单位: Zentrum für Marine Umweltwissenschaften (MARUM)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/320220536?language=en
• 关键词: Evolution; Indian; summer; monsoon; terrestrial

The primary objective of the proposed project is to reconstruct past behavior of the Indian summer monsoon (ISM) circulation during the last 1.2 million years at orbital to centennial timescales. During this interval, low-amplitude 41 ka obliquity-forced climate cycles between 2.8 and 0.9 Ma were replaced progressively by high-amplitude 100 ka cycle increasing severity and duration of cold stages, which has substantially influenced the biota and different ecosystems. Previous studies have shown that changes in atmospheric moisture content driven by the strengthening/weakening of the monsoon controlled precipitation and vegetation development as well as considerable changes in sea surface salinity, implying strong interactions between the solid earth, oceanic and atmospheric processes. However, continuous and high temporal resolution records from the core convective region of the Indo-Asian monsoon system, which have the potential to document the detailed evolution of the ISM, were lacking prior to the IODP Expedition 353. This project aims at understanding Pleistocene changes of the ISM through high resolution records of large-scale vegetation changes and terrestrial hydrology of northeastern India as well as past sea-surface ecological changes in the northern Bay of Bengal for two key periods; the mid-Pleistocene transition (MPT) and the last interglacial/glacial cycle, using marine sediments of IODP site U1446. This palynological study should provide insights into the long-term interaction processes in the marine and adjacent terrestrial realm allowing for a direct land-ocean-atmosphere correlation. It would, thus, offer an important complement to the almost exclusively paleoceanographic (foraminifera and isotopes) multi-proxy studies investigated by expedition scientists of the IODP Expedition 353. Despite the fact that marine palynology provide a powerful tool to reconstruct past variations in the ISM magnitude and frequency and to advance our current understanding of different forcing mechanisms, good data sets of pollen/spores and organic dinoflagellate cyst assemblages are (as good as) non-existent for the core convective region of the monsoon system during those time intervals with major re-organizations in the atmosphere, oceans, cryosphere and biosphere.

拟议项目的主要目标是重建过去120万年来印度夏季风环流在轨道到百年时间尺度上的过去行为。在此期间，2.8~0.9 Ma之间的低幅度41ka倾角强迫气候循环逐渐被高幅度100ka气候循环所取代，冷期的严重程度和持续时间增加，这对生物群和不同的生态系统产生了重大影响。以往的研究表明，季风增强/减弱引起的大气湿度的变化控制着降水和植被的发展，以及海面盐度的显著变化，这意味着固体地球、海洋和大气过程之间的强烈相互作用。然而，在IODP考察353之前，缺乏来自印度-亚洲季风系统核心对流区的连续和高时间分辨率的记录，这些记录有可能记录ISM的详细演变。该项目旨在利用IODP网站U1446的海洋沉积物，通过对印度东北部大规模植被变化和陆地水文以及孟加拉湾北部过去两个关键时期--中更新世过渡(MPT)和最后一次间冰期/冰川旋回--的海面生态变化的高分辨率记录，了解ISM的更新世变化。这项孢粉学研究应能深入了解海洋和邻近陆地领域的长期相互作用过程，从而实现陆地-海洋-大气的直接关联。因此，它将是对IODP 353探险队的探险家们调查的几乎完全是古海洋学(有孔虫和同位素)多代理研究的重要补充。尽管海洋孢粉学提供了一个强有力的工具来重建ISM规模和频率的过去变化，并促进了我们目前对不同强迫机制的理解，但在那些在大气、海洋、冰冻圈和生物圈发生重大重组的时间间隔内，季风系统核心对流区几乎不存在良好的花粉/孢子和有机甲藻孢囊组合的数据集。

项目成果

Recent climatic and anthropogenic impacts on endemic species in southwestern Morocco

• DOI: 10.1016/j.quascirev.2019.105889
• 发表时间: 2019-10
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: Xue-qin Zhao;L. Dupont;R. Cheddadi;M. Kölling;H. Reddad;J. Groeneveld;F. Ain-Lhout;I. Bouimetarhan

Consistent CO2 release by pyrite oxidation on continental shelves prior to glacial terminations

• DOI: 10.1038/s41561-019-0465-9
• 发表时间: 2019-11-01
• 期刊: NATURE GEOSCIENCE
• 影响因子: 18.3
• 作者: Koelling, Martin;Bouimetarhan, Ilham;Zabel, Matthias
• 通讯作者: Zabel, Matthias