Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period
There continues to be debate on the wet and dry conditions in central China due to different geological archives and proxy interpretations. This study reconstructed multi-proxy sequences spanning intervals between 65 and 40 ka using high-precision Th-230 dates, which was carried out on a stalagmite...
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sg-ntu-dr.10356-1640942023-01-04T08:15:13Z Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period Meng Wang Chen, Shitao Wang, Yongjin Zhao, Kan Wang, Xianfeng Liang, Yijia Wang, Zhenjun Zhang, Zhenqiu Chen, Gongzhe Asian School of the Environment Earth Observatory of Singapore Social sciences::Geography East Asian Monsoon Abrupt Climate Events There continues to be debate on the wet and dry conditions in central China due to different geological archives and proxy interpretations. This study reconstructed multi-proxy sequences spanning intervals between 65 and 40 ka using high-precision Th-230 dates, which was carried out on a stalagmite from Yongxing cave in the middle Yangtze Valley located in the Meiyu belt, China. Merely according to the petrography of the sample, Heinrich (H) 5-H6, Dansgaard–Oeschger (DO) 9-DO18 (or even secondary changes including DO15a and DO15b; DO17a, DO17b, and DO17c) were directly identified alongside the oxygen isotope record. The δ13C, trace elements, mineralogical, and bio-geochemical proxies exhibited similar millennial changes to that of the δ18O. This provided an indication of responses to millennial-scale climatic events in the karst hydrological cycle, local environment, and soil vegetation; however, the sensitivities to these events differed. Petrographic analyses of the same stalagmite including scanning electrical microscope (SEM), X-ray diffraction (XRD), fluorescence intensity, the deposition rate, and the diameter index depicted a dry-cold climate during the H events, and a wet-warm climate during the DO cycles in the middle Yangtze Valley. These results are consistent with the peat records of Dajiuhu Lake in the same area. We suggest that a combination of Atlantic Meridional Overturning Circulation (AMOC) and El Niño-Southern Oscillation (ENSO) may exert a strong influence on the Meiyu region and the related precipitation. This work was funded by the National Nature Science Foundation of China (awards 42072207, 42071105, 41931178), Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application. 2023-01-04T08:15:13Z 2023-01-04T08:15:13Z 2022 Journal Article Meng Wang, Chen, S., Wang, Y., Zhao, K., Wang, X., Liang, Y., Wang, Z., Zhang, Z. & Chen, G. (2022). Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period. Palaeogeography, Palaeoclimatology, Palaeoecology, 586, 110764-. https://dx.doi.org/10.1016/j.palaeo.2021.110764 0031-0182 https://hdl.handle.net/10356/164094 10.1016/j.palaeo.2021.110764 2-s2.0-85120656378 586 110764 en Palaeogeography, Palaeoclimatology, Palaeoecology © 2021 Elsevier B.V. All rights reserved. |
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Social sciences::Geography East Asian Monsoon Abrupt Climate Events Meng Wang Chen, Shitao Wang, Yongjin Zhao, Kan Wang, Xianfeng Liang, Yijia Wang, Zhenjun Zhang, Zhenqiu Chen, Gongzhe Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period |
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There continues to be debate on the wet and dry conditions in central China due to different geological archives and proxy interpretations. This study reconstructed multi-proxy sequences spanning intervals between 65 and 40 ka using high-precision Th-230 dates, which was carried out on a stalagmite from Yongxing cave in the middle Yangtze Valley located in the Meiyu belt, China. Merely according to the petrography of the sample, Heinrich (H) 5-H6, Dansgaard–Oeschger (DO) 9-DO18 (or even secondary changes including DO15a and DO15b; DO17a, DO17b, and DO17c) were directly identified alongside the oxygen isotope record. The δ13C, trace elements, mineralogical, and bio-geochemical proxies exhibited similar millennial changes to that of the δ18O. This provided an indication of responses to millennial-scale climatic events in the karst hydrological cycle, local environment, and soil vegetation; however, the sensitivities to these events differed. Petrographic analyses of the same stalagmite including scanning electrical microscope (SEM), X-ray diffraction (XRD), fluorescence intensity, the deposition rate, and the diameter index depicted a dry-cold climate during the H events, and a wet-warm climate during the DO cycles in the middle Yangtze Valley. These results are consistent with the peat records of Dajiuhu Lake in the same area. We suggest that a combination of Atlantic Meridional Overturning Circulation (AMOC) and El Niño-Southern Oscillation (ENSO) may exert a strong influence on the Meiyu region and the related precipitation. |
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Asian School of the Environment |
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Asian School of the Environment Meng Wang Chen, Shitao Wang, Yongjin Zhao, Kan Wang, Xianfeng Liang, Yijia Wang, Zhenjun Zhang, Zhenqiu Chen, Gongzhe |
format |
Article |
author |
Meng Wang Chen, Shitao Wang, Yongjin Zhao, Kan Wang, Xianfeng Liang, Yijia Wang, Zhenjun Zhang, Zhenqiu Chen, Gongzhe |
author_sort |
Meng Wang |
title |
Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period |
title_short |
Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period |
title_full |
Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period |
title_fullStr |
Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period |
title_full_unstemmed |
Stalagmite multi-proxy evidence of wet and dry intervals in the middle Yangtze Valley during the last glacial period |
title_sort |
stalagmite multi-proxy evidence of wet and dry intervals in the middle yangtze valley during the last glacial period |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/164094 |
_version_ |
1754611284530167808 |