TY - JOUR
T1 - Climate significance of speleothem δ18O from central China on decadal timescale
AU - Tan, Liangcheng
AU - Cai, Yanjun
AU - Cheng, Hai
AU - Lawrence Edwards, R.
AU - Shen, Chuan Chou
AU - Gao, Yongli
AU - An, Zhisheng
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/7/1
Y1 - 2015/7/1
N2 - Speleothem-based oxygen isotopic sequences have been widely used to reveal regional climatic changes worldwide. However, the climatic significance of speleothem δ18O variations in monsoonal China on decadal- to annual timescales remains in debate, which limits its application to paleoclimate reconstruction in the world's largest country by population. In this study, we analyzed a seasonally resolved δ18O record of an annually layered stalagmite, XL21 whose variability covers a period of 98years (1912-2009AD), from Xianglong Cave, central China. The annual δ18O trend shows an inverse relationship with local monsoon precipitation, suggesting speleothem δ18O variations in this area can reflect monsoon precipitation at least on decadal timescale. Changes in moisture sources and transport pathways have little effect on the δ18O variations in speleothems/monsoon precipitation on decadal timescale, which may be ascribed to similar distances from this region to the two main moisture sources, the Bay of Bengal and West Pacific. There is an anti-phase relationship between speleothem δ18O records from central China and India during the last 98years, which indicates the relationship between Indian monsoon intensity and speleothem δ18O from central China on short timescales requires further investigation.
AB - Speleothem-based oxygen isotopic sequences have been widely used to reveal regional climatic changes worldwide. However, the climatic significance of speleothem δ18O variations in monsoonal China on decadal- to annual timescales remains in debate, which limits its application to paleoclimate reconstruction in the world's largest country by population. In this study, we analyzed a seasonally resolved δ18O record of an annually layered stalagmite, XL21 whose variability covers a period of 98years (1912-2009AD), from Xianglong Cave, central China. The annual δ18O trend shows an inverse relationship with local monsoon precipitation, suggesting speleothem δ18O variations in this area can reflect monsoon precipitation at least on decadal timescale. Changes in moisture sources and transport pathways have little effect on the δ18O variations in speleothems/monsoon precipitation on decadal timescale, which may be ascribed to similar distances from this region to the two main moisture sources, the Bay of Bengal and West Pacific. There is an anti-phase relationship between speleothem δ18O records from central China and India during the last 98years, which indicates the relationship between Indian monsoon intensity and speleothem δ18O from central China on short timescales requires further investigation.
KW - Central china
KW - Decadal timescale
KW - Monsoon precipitation
KW - Speleothem δO
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U2 - 10.1016/j.jseaes.2015.03.008
DO - 10.1016/j.jseaes.2015.03.008
M3 - Article
AN - SCOPUS:84930042422
SN - 1367-9120
VL - 106
SP - 150
EP - 155
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
ER -