地质学报2017，Vol.91Issue(12)：2854-2866,13.
黑龙江五大连池火山口湖沉积物有机残体粒度记录的早全新世千百年尺度夏季风降水演化
Grain-size of Organic Debris in Sediments from Wudalianchi Crater Lake in Heilongjiang Province Record the Evolution of Summer Monsoon Precipitation at Millennial-to Centennial-Scale in the Early Holocene
摘要
Abstract
Millennial-to centennial-scale climate events in the early Holocene have been detected from numerous geological records in China,but records in high latitudes are still limited.Therefore,it could contribute to this research if such records are reconstructed in higher latitude regions of China.In the present study,grain sizes of a sediment core retrieved from a crater lake in Northeast China were analyzed.Sensitive grain size component of ＞83 μm was extracted by analyzing the grain size versus standard deviation curve of sediment,organic debris was not excluded.This component was mainly organic debris and can be used as a proxy of summer monsoon precipitation.Based on chronology from precise 14C dates and the results of grain size analysis,a sequence of early Holocene summer monsoon precipitation in Northeast China was reconstructed.The results indicate that early Holocene monsoon precipitation in Northeast China fluctuated frequently with four millennial to centennial weak events of summer monsoon at ～ 8.6,9.2,10.2 and 11.6 ka BP.All of these weak monsoon intervals corresponded well with those in other climate records within chronological errors,e.g.records from the monsoon regions of China,North Atlantic ice-raft events and the solar activity records.The synchronicity of these records suggests widely spread drought events at millennial-to centennial-scale in the monsoon regions of China,and might link closely to the North Atlantic ice-raft events and solar activity.However,the durations of the four weak summer monsoon precipitation events recorded by grain sizes in the Wudalianchi lake sediments were significantly shorter than those in other climate records.One possible explanation is that the North Atlantic ice-raft events impacted high latitude regions via summer monsoon,while monsoon signal weakened gradually from low latitudes to high latitudes,resulting in the shorter duration of the events in our record.关键词
早全新世/火山口湖/敏感粒级/弱夏季风事件/中国东北地区Key words
Early Holocene/crater lake/sensitive grain size/weak summer monsoon events/Northeast China引用本文复制引用
刘孝艳,娄本军,詹涛,刘恋,周鑫,乔彦松,涂路遥,马永法,姜侠,张俊..黑龙江五大连池火山口湖沉积物有机残体粒度记录的早全新世千百年尺度夏季风降水演化[J].地质学报,2017,91(12):2854-2866,13.基金项目
本文为国土资源部公益性科研专项(201311137),国家重点基础研究发展规划项目(973项目)(批准号:2010CB428902),国家自然科学基金项目(批准号:41301040、41672159、41102223,41306198),黑龙江省青年科学基金项目(批准号:QC2013C039)和中国地质科学院基本科研业务费项目(批准号:ywf201609)共同资助的成果. （201311137）
