High-resolution geochemistry records of climate changes since late-glacial from Dajiuhu peat in Shennongjia Mountains,Central China  

作　　者：MA ChunMei ZHU Cheng ZHENG ChaoGui WU ChunLin GUAN Yong ZHAO ZhiPing HUANG LinYan HUANG Run 

机构地区：[1]School of Geographic and Oceanographic Sciences of Nanjing University,Nanjing 210093,China [2]Department of Geography,Chuzhou College,Chuzhou 239012,China

出　　处：《Chinese Science Bulletin》2008年第S1期28-41,共14页

基　　金：Supported by the Key Project of the National Natural Science Foundation of China(Grant No.90411015);the Project of the National Natural Science Foundation ofChina(Grant No.40701190);the University Doctoral Foundation(Grant No.20050284011);the Foundation of Important Basic Research at Nanjing University(Grant No.0209005206);the Open Foundation of the State Key Laboratory of Loessand Quaternary Geology from the Institute of Earth Environment,CAS(Grant No.SKLLQG0503);the Physical Geography of"985"Items and the Test Foundation ofModern Analyses Center of Nanjing University(Grant No.0209001309)

摘　　要：A peat core with depths of 297 cm was obtained from the Dajiuhu Basin(31°29′27″N,109°59′45″E,1760 m)in Hubei Province,Central China.10 AMS ages provide a time control and reveal that this core spans the past about 16.0 kaBP(calibrated age)(1 4C age:13.3 kaBP).Multi-proxy indexes analysis of geochemistry shows the following character of climate and environmental changes since about 16 kaBP:(1) The climate during the late-glacial period was cold and wet as a whole,but fluctuated continually.11.4- 12.6 cal.kaBP,12.6-15.2 cal.kaBP and 15.2-16 kaBP were corresponding respectively to the Younger Drays,Bφlling-Allerφd Warm Period and the Oldest Drays.(2)Inheriting the some climate characteristics of the late-glacial,the climate during the early-Holocene was wet and temperature increased gradually,during which an obvious dry event around 10.6 cal.kaB appeared.(3)The climate during the mid-Holocene was genarally warm and wet.During 9.2-7.5 kaBP,temperature increased gradually, precipitation was less comparatively and the 8.2 kaBP cold event which might be representative in the globe was reflected markedly.Then,multi-proxy records were relatively stable during 6.7-4.2 kaBP, which shows the best water and thermal condition in the Holocene Optimum.(4)Around 4.2 kaBP,the climate and environment transform from warm and wet to cool and dry,which may result in the collapse of the Neolithic Culture and midwifery the civilization of Xia Dynasty in this region.After 0.9 kaBP,the climate turned cool and wet.Climate and environmental changes archived in Dajiuhu peat respond to the global changes since the late-glacial period and can be contrasted to the changes recorded in other high-resolution archives from the East Asia Monsoon region,which take on the variety model that the monsoon strengthened abruptly after the late-glacial,was strong during the early Holocene,subse- quently declined and became weak after the middle Holocene with dry climate.According to our analysis,the driving mechanism should be the response of soA peat core with depths of 297 cm was obtained from the Dajiuhu Basin (31°29′27″N, 109°59′45″E, 1760 m) in Hubei Province, Central China. 10 AMS ages provide a time control and reveal that this core spans the past about 16.0 kaBP (calibrated age) (14C age: 13.3 kaBP). Multi-proxy indexes analysis of geochemistry shows the following character of climate and environmental changes since about 16 kaBP: (1) The climate during the late-glacial period was cold and wet as a whole, but fluctuated continually. 11.4–12.6 cal. kaBP, 12.6–15.2 cal. kaBP and 15.2–16 kaBP were corresponding respectively to the Younger Drays, B?lling-Aller?d Warm Period and the Oldest Drays. (2) Inheriting the some climate characteristics of the late-glacial, the climate during the early-Holocene was wet and temperature increased gradually, during which an obvious dry event around 10.6 cal. kaB appeared. (3) The climate during the mid-Holocene was genarally warm and wet.During 9.2–7.5 kaBP, temperature increased gradually, precipitation was less comparatively and the 8.2 kaBP cold event which might be representative in the globe was reflected markedly. Then, multi-proxy records were relatively stable during 6.7–4.2 kaBP, which shows the best water and thermal condition in the Holocene Optimum. (4) Around 4.2 kaBP, the climate and environment transform from warm and wet to cool and dry, which may result in the collapse of the Neolithic Culture and midwifery the civilization of Xia Dynasty in this region. After 0.9 kaBP, the climate turned cool and wet. Climate and environmental changes archived in Dajiuhu peat respond to the global changes since the late-glacial period and can be contrasted to the changes recorded in other high-resolution archives from the East Asia Monsoon region, which take on the variety model that the monsoon strengthened abruptly after the late-glacial, was strong during the early Holocene, subsequently declined and became weak after the middle Holocene with dry climate. According to our analysis, the dri

关 键 词：LATE-GLACIAL HOLOCENE Dajiuhu of Shenongjia PEAT climate changes GEOCHEMISTRY 

分 类 号：P532[天文地球—古生物学与地层学]