Climatic implications of stalagmite grey scale sequence during the Early Holocene from the Yangkou cave, Chongqing

CUI Guyue; YANG Xunlin; FANG Moqin; SUN Xili; SHI Zhichao; WANG Baoyan

doi:10.11932/karst20170203

2017 No. 2

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CUI Guyue, YANG Xunlin, FANG Moqin, SUN Xili, SHI Zhichao, WANG Baoyan. Climatic implications of stalagmite grey scale sequence during the Early Holocene from the Yangkou cave, Chongqing[J]. Carsologica Sinica, 2017, (2): 171-178. doi: 10.11932/karst20170203

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CUI Guyue, YANG Xunlin, FANG Moqin, SUN Xili, SHI Zhichao, WANG Baoyan. Climatic implications of stalagmite grey scale sequence during the Early Holocene from the Yangkou cave, Chongqing[J]. Carsologica Sinica, 2017, (2): 171-178. doi: 10.11932/karst20170203

Climatic implications of stalagmite grey scale sequence during the Early Holocene from the Yangkou cave, Chongqing

Publish Date: 25 April 2017

Abstract

Abstract

One stalagmite (YK719) from the Yangkou cave at the Jinfo Mountains,Nanchuan in Chongqing is used as the research object in this article.The purpose is to reconstruct the climate change in the early Holocene with accurate-230 Th dating results,δ18O and grey scale data.Comparison of the grey scale sequence and δ18O suggests that δ18O value was heavier during the weak monsoon period.Accordingly,the grey scale sequence shows a "trough-shaped" pattern.However,it showed "a crest" pattern when the monsoon was powerful.Furthermore,the grey scale value has a good correlation with the tree ring △14C data and the sunspot number,suggesting the solar activity is an important factor in controlling the variation of grey scale values.Solar activity might affect the grey scale value variation via temperature and monsoon precipitation,(1)The increase of temperature leads to the rise of soil microbial activity and a large amount of decomposed or ganic matter.Meanwhile,rock would be dissolved faster for the rise in the dissolved organic carbon and soil CO2.Thus,the relatively pure calcite would be deposited with darkish and transparent appearance.Otherwise,it would be opaque and milky;(2) Solar activity-induced changes in the North Atlantic floating ice may indirectly affect the Asian monsoon precipitation variation through the coupling of the monsoon and Eurasian snow cap in the early Holocene,so as to affect the change of grey scale values of stalagmites.
- stalagmite /
- grey scale value /
- early Holocene /
- east Asian monsoon /
- solar activity