The centennial-scale response of the Indian monsoon to Holocene climate change: a high-resolution lacustrine isotope record from Peiku Co, Tibet

印度季风对全新世气候变化的百年尺度响应：西藏北库错高分辨率湖泊同位素记录

• 批准号: NE/H000836/1
• 负责人: Andrew Henderson
• 金额: $ 11.14万
• 依托单位: University of Glasgow
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FH000836%2F1
• 关键词: centennial; scale; response; Indian; monsoon

Knowledge of the past variations in the Indian summer monsoon (ISM) is essential for understanding the monsoon system as a whole and its relationship to other parts of the climate system. Despite existing instrumental data and proxy evidence for variations in the ISM at sub-decadal to millennial timescales, we still have a poor understanding of how monsoon circulation has controlled long-term moisture over the Asian landmass. While marine and stalagmite proxy records have provided a framework of variations in the ISM, they reveal little about the hydrological conditions within the continental monsoon domain, where the human population is foremost. Even so, these records show decadal- to century-scale climate oscillations in the ISM that are concurrent with N. Atlantic ocean circulation changes, significant perturbations in tropical ocean temperatures and ENSO-like behaviour in the western Pacific warm pool, potentially forced by variations in solar output. But, it is unclear whether the monsoon responds to high-latitude teleconnections, or plays a primary role in initiating and/or amplifying abrupt climate changes from the tropics via ENSO-like mechanisms. Consequently, pre-instrumental palaeoclimate records of the ISM are key to understanding the origin of monsoon variability. I will investigate ISM variability over the past 15,000 cal. years through a high-resolution isotopic and trace element study of ostracods from sediments in Lake Peiku Co, southern Tibet. Peiku Co offers one of the best archives of information of past moisture changes as it lies at the edge of ISM rains and is therefore sensitive to changes in monsoon intensity. This palaeoclimatic record will be used to evaluate changes in the behaviour of the ISM and to investigate the relative importance of different forcing factors and wider climatic teleconnections.

了解印度夏季季风（ISM）过去变化的知识对于理解整个季风系统及其与气候系统其他部分的关系至关重要。尽管现有的仪器数据和替代证据表明，在千禧年的时间标准中，ISM的变化，我们仍然对季风循环如何控制亚洲陆地上的长期水分有很差的了解。尽管海洋和stalagmite代理记录提供了ISM变化的框架，但它们几乎没有透露大陆季风域内的水文条件，该季风域中的人口是最重要的。即便如此，这些记录仍显示ISM中衰老到世纪的气候振荡与大西洋海洋循环的变化同时发生，热带海洋温度的显着扰动以及西部太平洋暖池中的ENSO样行为，可能会因太阳能输出的变化而可能被强迫。但是，目前尚不清楚季风是对高纬度远程连接的反应，还是在通过类似ENSO的机制引发和/或扩大热带地区突然的气候变化方面起主要作用。因此，ISM的乐器前气候记录是理解季风可变性起源的关键。我将调查过去15,000 cal的ISM变异性。多年来，通过来自西藏南部Peiku Lake Co的沉积物的高分辨率同位素和微量元素研究。 Peiku Co提供了过去水分变化的最佳信息档案之一，因为它位于ISM降雨的边缘，因此对季风强度的变化敏感。该古气候记录将用于评估ISM行为的变化，并研究不同强迫因子和更广泛的气候远程连接的相对重要性。

项目成果

Late glacial and Holocene monsoon variability in southern Tibet

藏南晚冰期和全新世季风变化

• 发表时间: 2013
• 作者: Henderson ACG

Holocene Asian monsoon fluctuations: a preliminary assessment using scanning XRF of lacustrine sediments from Peiku Co, Tibet

全新世亚洲季风波动：利用XRF扫描对西藏北库错湖相沉积物进行初步评估

• 发表时间: 2010
• 作者: Henderson ACG

Late glacial high-resolution palaeohydrological changes over southern Tibet: multi-proxy evidence for Indian monsoon variability

藏南地区晚冰期高分辨率古水文变化：印度季风变化的多代理证据

• 发表时间: 2012
• 作者: Henderson ACG

Late Quaternary monsoon variability over southern Tibet

藏南晚第四纪季风变化

• 发表时间: 2011
• 作者: Henderson ACG

Applying magnetostratigraphy to lacustrine sediments to obtain non-hard-water-effect affected patterns of late Holocene monsoon dynamics on the Tibetan Plateau

将磁性地层学应用于湖泊沉积物以获得青藏高原晚全新世季风动力学的非硬水效应影响模式

• 发表时间: 2011
• 作者: Haberzettl T