TY - JOUR
T1 - A 3000-yr annually laminated stalagmite record of the Last Glacial Maximum from Hulu Cave, China
AU - Duan, Fucai
AU - Wu, Jiangying
AU - Wang, Yongjin
AU - Edwards, R. Lawrence
AU - Cheng, Hai
AU - Kong, Xinggong
AU - Zhang, Weihong
PY - 2015/3/1
Y1 - 2015/3/1
N2 - A high-resolution, annual layer-counted and 230Th-dated multi-proxy record is constructed from a stalagmite in Hulu Cave, China. These proxies, including δ18O, annual layer thickness (ALT), gray level (GL) and Sr/Ca, cover a time span of ~3000yr from 21 to 24ka. The physical proxies (ALT and GL) and the geochemical index (Sr/Ca), all primarily reflecting karst hydrological processes, vary in concert and their coherence is supported by wavelet analyses. Variations in the δ18O data agree with fluctuations in the ALT and Sr/Ca records on multi-decadal to centennial scales, suggesting that the Hulu δ18O signal is strongly associated with varying local rainfall amounts on short timescales. A monsoon failure event at ~22.2ka correlates with a decrease in tropical rainfall, a reduction in global CH4 and an ice-rafted event in the North Atlantic. This correlation highlights roles of the Asian monsoon and tropical hydrological cycle in modulating global CH4, because the high-latitude emission was inhibited during the Last Glacial Maximum (LGM). Spectral analysis of the δ18O record displays peaks at periodicities of 139, 59, 53, 43, 30, 23 and 19-15yr. The absence of typical centennial solar cycles may be related to muted changes in ocean circulation during the LGM.
AB - A high-resolution, annual layer-counted and 230Th-dated multi-proxy record is constructed from a stalagmite in Hulu Cave, China. These proxies, including δ18O, annual layer thickness (ALT), gray level (GL) and Sr/Ca, cover a time span of ~3000yr from 21 to 24ka. The physical proxies (ALT and GL) and the geochemical index (Sr/Ca), all primarily reflecting karst hydrological processes, vary in concert and their coherence is supported by wavelet analyses. Variations in the δ18O data agree with fluctuations in the ALT and Sr/Ca records on multi-decadal to centennial scales, suggesting that the Hulu δ18O signal is strongly associated with varying local rainfall amounts on short timescales. A monsoon failure event at ~22.2ka correlates with a decrease in tropical rainfall, a reduction in global CH4 and an ice-rafted event in the North Atlantic. This correlation highlights roles of the Asian monsoon and tropical hydrological cycle in modulating global CH4, because the high-latitude emission was inhibited during the Last Glacial Maximum (LGM). Spectral analysis of the δ18O record displays peaks at periodicities of 139, 59, 53, 43, 30, 23 and 19-15yr. The absence of typical centennial solar cycles may be related to muted changes in ocean circulation during the LGM.
KW - East Asian summer monsoon
KW - Hulu Cave
KW - Last Glacial Maximum
KW - Monsoon rainfall
KW - Stalagmite
UR - http://www.scopus.com/inward/record.url?scp=84925125607&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84925125607&partnerID=8YFLogxK
U2 - 10.1016/j.yqres.2015.01.003
DO - 10.1016/j.yqres.2015.01.003
M3 - Article
AN - SCOPUS:84925125607
VL - 83
SP - 360
EP - 369
JO - Quaternary Research (United States)
JF - Quaternary Research (United States)
SN - 0033-5894
IS - 2
ER -