A new speleothem record of the penultimate deglacial: Insights into spatial variability and centennial-scale instabilities of East Asian monsoon

Xue, Gang; Cai, Yanjun; Ma, Lei; Cheng, X.; Cheng, Hai; Edwards, R. Lawrence; Li, Dong; Tan, Liangcheng

doi:10.1016/j.quascirev.2019.02.023

Cited by 17 publications

(24 citation statements)

References 78 publications

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“…Based on the local “amount effect” (i.e., the negative relationship between

δ^{18} O_{P}

and rainfall amount at the same site) (Dansgaard, ; Ishizaki et al, ; Lee & Fung, ; Risi et al, ), the precipitation δ 18 O in the Asian monsoon region should represent the regional monsoon precipitation amount (Cheng et al, , ; Hu et al, ; Yuan et al, ; Wang et al, ). This assumes that the local amount effect is dominant, yet other studies have shown other processes to be important: upstream rainout processes (Pausata et al, ), changes in moisture sources or atmospheric circulation pathways (Breitenbach et al, ; Liu et al, ; Maher & Thompson, ; Tabor et al, ; Tan, ), convective activity (Aggarwal et al, ; Kurita et al, ), karst system processes (Baker et al, ), and sea level changes (Xue et al, ). Thus, a more refined interpretation of oxygen isotope excursions in Chinese speleothems requires that all contributions be quantified.…”

Section: Introductionmentioning

confidence: 99%

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Emile‐Geay

Tabor

et al. 2019

Paleoceanog and Paleoclimatol

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Speleothem 18 O is widely used to reconstruct past hydroclimate variability, particularly over Asia. However, the interpretation of this proxy is still in debate. While this proxy is originally interpreted as regional rainfall amount of the Asian monsoon, other studies have interpreted it as upstream monsoon rainfall or atmospheric circulation changes. To better understand the signal preserved in speleothems over various time scales, this study employs a state-of-the-art isotope-enabled climate model to quantify contributions to the oxygen isotope composition of precipitation ( 18 O P ) over China. Results suggest that orbital-scale speleothem 18 O variations at Chinese sites mainly record the meridional migration of the Asian monsoon circulation, accompanied by an early northward movement of the East Asian rain belt. At interannual scales, Chinese speleothem 18 O is also tied to the intensity of monsoonal circulation, via a change in moisture source locations: Enhanced moisture delivery from remote source regions leads to more negative 18 O P , particularly in late summer and early autumn. Our results have implications for the hydroclimatic interpretation of speleothem 18 O from Chinese caves and suggest that this interpretation is time scale dependent.

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“…Based on the local “amount effect” (i.e., the negative relationship between

δ^{18} O_{P}

Section: Introductionmentioning

confidence: 99%

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Emile‐Geay

Tabor

et al. 2019

Paleoceanog and Paleoclimatol

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“…As described by Xue et al (2019), the stalagmite SD-1 is ∼41 cm in length and ∼12 cm in diameter. It is mostly composed of calcite, with columnar fabric characteristics.…”

Section: Stalagmite Sample and Analytical Methodsmentioning

confidence: 86%

“…For example, the speleothem δ 18 O was relatively negative from 138 to 135.5 ka BP and increased gradually, while δ 13 C and trace element records, however, were relatively positive and decreased in general (Figure 5), incomparable with the aforementioned explanation. This contrast between δ 18 O and δ 13 C and trace elements could be ascribed to a southeastward shift of coastline that increased the distance from the cave site to the ocean and deplete the precipitation δ 18 O during the glacial maxima (Xue et al, 2019), whereas "increased distance" could cause the decreased precipitation amount leading to increased δ 13 C and trace element ratios (Sr/Ca and Mg/Ca), confirmed the impacts of coastline shifts on the precipitation amount and the precipitation isotopic compositions (δ 18 O) are different during the lowstands of sea level. In addition, during the deglaciation (135.1-128.1 ka BP), the δ 18 O and trace element relative changes differed (Figure 5) as well.…”

Section: The Hydroclimatic Changes During the Penultimate Deglaciation In Shandong Peninsula And The Potential Driving Forcementioning

confidence: 99%

“…In this study, we analyzed the Sr/Ca and Mg/Ca ratios of a penultimate deglacial stalagmite from Shangxiaofeng cave, northeastern China. After evaluating the reliability of the Sr/Ca and Mg/Ca ratios obtained using the XRF scanning technique and combining them with previously reported δ 13 C data (Xue et al, 2019), we investigated hydrological variations during the penultimate glacial-interglacial transition at the cave site and explored the potential driving forces of local hydroclimatic change.…”

mentioning

confidence: 99%

“…Figure 5. Comparison of (a) SD1 δ 18 O (Xue et al, 2019), (b) SD1 δ 13 C(Xue et al, 2019) and insolation at 65°N(Berger, 1978), (c) Mg/Ca ratios (ICP-OES), (d) Sr/Ca ratios (ICP-OES), (e) Sr/Ca ratios (XRF), (f) sea level change(Spratt & Lisiecki, 2016). The yellow bar shows the disparities between the δ 18 O and trace element records.…”

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confidence: 99%

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Speleothem‐Based Hydroclimate Reconstructions During the Penultimate Deglaciation in Northern China

Xue

Cai

Lü

et al. 2021

Paleoceanog and Paleoclimatol

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Hydroclimatic change has a substantial impact on the lives and well-being of humans, especially in densely populated regions (Yang et al., 2015). As recorded in historical literature and as is known through modern observations, floods and droughts have occurred frequently in China, affecting not only agricultural production and regional economies, but also water security in China. Understanding the past variability of hydroclimatic change and its dynamics is essential for projecting future changes and mitigating the potential influence of climate change. Instrumental records usually not exceed 70 years, or 150 years in some cities in China. These records are too short to provide a full understanding of the variability of hydroclimatic change and the underlying forcing mechanisms. Therefore, the reconstruction of past hydroclimatic conditions by using various archives has generally been the focus of past climate change studies.As a type of secondary carbonate deposition that grew within caves, speleothem has been regarded as one of the most important archives in paleoclimate-related and paleoenvironmental studies. Chinese speleothem δ 18 O records have demonstrated Asian monsoon variability over the last seven glacial-interglacial transitions (Cheng et al., 2016; references therein). In terms of the penultimate deglaciation, Asian monsoon variability, driving forces, and the timing and structure of Termination II have been discussed based on various speleothem δ 18 O records (

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Orbital‐ to millennial‐scale variation of the speleothem δ¹⁸O record during Marine Isotope Stages 5 to 3 on the southeast Chinese Loess Plateau and its climatic and environmental implications

Cai

Cheng

et al. 2022

J Quaternary Science

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The Chinese Loess Plateau (CLP) is located in northern China, a region climatically dominated by the East Asian monsoon. Speleothem records from this region are crucial to fully understand the variability of the East Asian summer monsoon (EASM) and reconcile the disparity seen between loess records and speleothem δ18O records for the EASM. Here, we present an absolutely dated stalagmite isotope record spanning most of Marine Isotope Stage (MIS) 5 to MIS 3 from Xiaotian Cave, southeast CLP. The Xiaotian speleothem δ18O record is dominated by precessional variations and punctuated by notable millennial‐scale oscillations; in particular, the δ18O values in MIS 5e, 5c and 5a were in the same range, consistent with other speleothem δ18O records from the EASM region within quoted errors, verifying the difference between speleothem δ18O and loess records (e.g. magnetic susceptibility) and the proposition that those two archives may record different aspects of the EASM changes. The similar values in MIS 5e, 5c and 5a observed from the speleothem δ18O records in EASM regions, incompatible with the relatively higher North Hemisphere Summer Insolation (NHSI) during MIS 5e, were probably caused by an equivalent or even increased contribution of 18O‐enriched moisture from the South China Sea and North Pacific, implying that an El Niño‐like state existed during MIS 5e. The Xiaotian δ18O values increased abruptly at ~121.7 thousand years (kyr) before the present (bp, present refers to ad 1950), consistent with the trend seen in previously reported Chinese speleothem δ18O records, indicating an abrupt regime shift in atmospheric circulations or hydroclimate conditions in the Asian monsoon systems. It cannot be definitely ruled out that an increase in sea ice extent in the northern North Atlantic, responding to a decrease of NHSI, reached a threshold to have led to abrupt changes in the Asian summer monsoon (ASM) through rapid shifts in the position of circulation of the westerlies and/or in the position of Intertropical Convergence Zone (ITCZ). Here, we hypothesized that sea surface cooling in the tropical Indian and Pacific Ocean caused by the decreased summer insolation reached a threshold that eventually resulted in an abrupt shift to more positive precipitation δ18O, either through weakened convection over the tropical ocean, or through abrupt shifts in moisture transport and cycling of tropical moisture sources for the ASM. The Xiaotian speleothem δ18O record also shows centennial‐scale variability with amplitude up to 3‰ within MIS 5e. These changes are similar to variations recorded by the speleothem δ18O record from Tianmen Cave on the south‐central Tibetan Plateau and Shangxiaofeng Cave in Shandong Province, northern China, suggesting a heightened sensitivity of precipitation δ18O to climate changes at the marginal zone of the ASM even during the warm and humid MIS 5e interglacial. Climatic oscillations during MIS 5e appear to be comparable to those typical of the Holocene, implying rather unstable climate cond...

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A new speleothem record of the penultimate deglacial: Insights into spatial variability and centennial-scale instabilities of East Asian monsoon

Cited by 17 publications

References 78 publications

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Speleothem‐Based Hydroclimate Reconstructions During the Penultimate Deglaciation in Northern China

Orbital‐ to millennial‐scale variation of the speleothem δ¹⁸O record during Marine Isotope Stages 5 to 3 on the southeast Chinese Loess Plateau and its climatic and environmental implications

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A new speleothem record of the penultimate deglacial: Insights into spatial variability and centennial-scale instabilities of East Asian monsoon

Cited by 17 publications

References 78 publications

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Speleothem‐Based Hydroclimate Reconstructions During the Penultimate Deglaciation in Northern China

Orbital‐ to millennial‐scale variation of the speleothem δ18O record during Marine Isotope Stages 5 to 3 on the southeast Chinese Loess Plateau and its climatic and environmental implications

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Orbital‐ to millennial‐scale variation of the speleothem δ¹⁸O record during Marine Isotope Stages 5 to 3 on the southeast Chinese Loess Plateau and its climatic and environmental implications