An annually laminated stalagmite from the eastern Qinghai-Tibetan Plateau provides evidence of climate instability during the early MIS5e in the Asian summer monsoon

Gao, Tao; Zhang, Pingzhong; Cheng, Hai; Zhang, Leilei; Li, Xinhu; Shi, Hongyu; Wei, Jia; Ning, Youfeng; Li, Hanying; Edwards, R. Lawrence

doi:10.1007/s11430-022-1054-x

Cited by 4 publications

(1 citation statement)

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“…Therefore, stalagmites are decent geological candidates for reconstructing annually resolved monsoon records and further understanding interactions of climate subsystems. Previous studies of the annually laminated stalagmites from the monsoonal region of China show that the approximate 60-year periodicity is an inherent characteristic of the Asian monsoon during the interglacial periods and the Late Holocene, and such climatic instability of the Asian summer monsoon (ASM) can affect vegetation, biological productivity, and karst systems [21][22][23]. Apart from the interglacial conditions, there are also decadal monsoonal variabilities found during the Last Glacial Maximum, according to a record based on an annually banded stalagmite from Hulu Cave, Nanjing [24].…”

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confidence: 99%

Multidecadal Monsoon Variations during the Early Last Deglaciation Revealed by Speleothem Record from Southwestern China

Liang,

Zhang,

et al. 2024

Minerals

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The Asian monsoon (AM) has direct and profound effects on the livelihoods of residents in South Asia and East Asia. Modern observations have shown multi-decadal alternations of flood and drought periods in these regions, likely influenced by climatic processes such as the Atlantic Multidecadal Oscillation and the Pacific Decadal Oscillation. However, our understanding of the multi-decadal variability of the AM under different climatic conditions remains uncertain. In this study, we collected an annually laminated and 780-mm stalagmite (sample number: BJ7) from Binjia (BJ) Cave in southwestern China, which is deeply influenced by the Asian monsoon system. Based on this sample, we established 6-year resolution and multi-proxy records for the Asian summer monsoon (ASM) variabilities during the early last termination, spanning from 18.2 to 16.1 ka BP. Measurements of five pairs of uranium and thorium solutions for 230Th dating were conducted using a multi-collector inductively coupled plasma mass spectrometer (MC-ICP- MS), and 374 pairs of stable isotope (δ18O and δ13C) analyses were run on a Kiel Carbonate Device connected with Finnigan MAT-253 at Nanjing Normal University. The chronology for this sample was established by annual layer counting anchored with 230Th dating results. Our BJ7 δ18O record replicates well with other Chinese δ18O records on the general trend, all of which are superimposed by frequent multidecadal-scale fluctuations at approximately 60 years periodicity. Inspection of the 60-year band in BJ7 δ18O and δ13C records and results of the cross-wavelet analysis indicate coherent changes in the ASM and biomass production/karst processes during most of the studied period. In addition, the 60-year band of BJ7 and NGRIP δ18O records are consistent, implying the impacts of the high-latitude North Atlantic or Atlantic Multidecadal Oscillation on the ASM. Our study suggests that the 60-year variability should be an intrinsic feature of the climate system regardless of glacial or interglacial backgrounds.

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