红原泥炭苔草的碳同位素组成与全新世季风变化

Carbon Isotopic Composition of the Carex Mulieensis Remain of the Hongyuan Peat Bog in the Eastern Tibetan Plateau and the Indian Ocean Summer Monsoon Variation in the Holocean

从红原泥炭中挑选出的单一植物残体———苔草纤维素的δ1 3C时间序列是印度洋夏季风强度变化的敏感代用指标 ,它不仅清楚地指示了过去 12 0 0 0年印度洋夏季风数千年尺度上的变化历史 ,而且记录下了 9次明显的季风突然减弱事件 ,它们可以与同时期北大西洋发生的冰川漂移碎屑沉积物事件一一对比。红原泥炭混合纤维素δ1 3C时间序列也同样清楚地记录了过去 12 0 0 0年印度洋夏季风数千年尺度上的变化历史 ,对全球大范围的主要气候突然变化事件也有很好的响应。因此 ,泥炭混合纤维素δ1

The δ 13 C time series of the mono-species plant,the carex mulieensis cellulose,selected from the Hongyuan peat bog has been considered as a sensitive proxy indicator for the strength of the Indian Ocean summer monsoon. It not only clearly shows the variation history of the monsoon on the several millennial time scales during the last 12 000 years, but also records 9 abrupt variation events of the monsoon that are strongly corresponding to the 9 ice-rafted debris events occurred in the North Atlantic Ocean during the same period. The δ 13 C time series of the total or mixed plant cellulose in the Hongyuan peat bog also clearly shows the same variation history of the monsoon in the last 12 000 years. It also records several abrupt climate change events, all of which occurred in the widespread area in the world, through it does not show clearly response to a few climate change events. The δ 13 C time series of the mixed plant cellulose can be considered as a practical proxy climate indicator.