Temperature and seawater isotopic controls on two stalagmite records since 83 ka from maritime Japan

Mori, Taiki; Kashiwagi, Kenji; Amekawa, Shota; Katō, Hirokazu; Okumura, Takahiro; Takashima, Chizuru; Wu, Chung‐Che; Shen, Chuan Chou; Quade, Jay; Kano, Akihiro

doi:10.1016/j.quascirev.2018.05.024

Cited by 14 publications

(23 citation statements)

References 71 publications

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“…This estimated temperature change is comparable with other paleoclimate studies using stalagmites and lake and marine deposits around the Japanese Islands (Nakagawa et al, 2002;Kawahata et al, 2011;Kigoshi et al, 2014;Uemura et al, 2016). Mori et al (2018) concluded that climate control on δ 18 O W values was insigni cant for Japanese caves, perhaps because of their proximity to moisture sources in the Paci c.…”

Section: Introductionsupporting

confidence: 86%

“…1). These stalagmites exhibit notably smaller amplitudes of variation in δ 18 O C than comparable Chinese cave records; hence, the glacial/interglacial contrast within these stalagmites can be accounted for by a typical warming temperature of 9°C from the last glacial maximum (LGM) to the mid-Holocene (Mori et al, 2018). This estimated temperature change is comparable with other paleoclimate studies using stalagmites and lake and marine deposits around the Japanese Islands (Nakagawa et al, 2002;Kawahata et al, 2011;Kigoshi et al, 2014;Uemura et al, 2016).…”

Section: Introductionsupporting

confidence: 75%

“…The importance of temperature signals was rea rmed for late Pleistocene to middle Holocene stalagmites from Mie and Gifu Prefectures, central Japan, located at the eastern margin of the East Asian monsoon (EAM) regime (Mori et al, 2018; Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Co-evolutions of temperature and monsoonal precipitation patterns from the latest Pleistocene to the mid-Holocene in Japan: Carbonate clumped isotope record of a stalagmite

Katō

Mori²,

Amekawa

et al. 2022

Preprint

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Quantitative paleotemperature reconstruction is a challenging and important issue in paleoenvironmental studies, for which carbonate clumped isotope (Δ47) thermometry is a promising approach. Here we analyzed Δ47 values from 66 layers of OT02 stalagmite from Ohtaki Cave in central Japan, covering two separate time intervals (2.6–8.8 and 34.8–63.5 ka) to reconstruct terrestrial temperature and meteoric δ18O records. The average Δ47 temperature of the Holocene portion of this stalagmite was 16.3°C ± 5.6°C and the average of the latest Pleistocene portion was 9.7°C ± 4.6°C. Δ47 thermometry also revealed that the coldest intervals (5°C–10°C) correspond to the Heinrich stadials HSs4–6, and the warmest interval (up to 19.9°C ± 6.0°C) in middle Holocene (approximately 6–5 ka) accompanied by the Hypsithermal climate optimum. We also reconstructed past meteoric δ18O by subtracting the temperature effect from stalagmite δ18O. Average meteoric δ18O was − 8.22‰ ± 0.99‰ VSMOW in the Holocene and − 8.81‰ ± 0.84‰ in the latest Pleistocene. Over centennial timescales, meteoric δ18O was lower during colder periods, such as Heinrich stadials and the cooling event around 7 ka, and higher in warmer periods, such as Hypsithermal warming. These relations indicated synchronicities of terrestrial paleotemperature and paleoprecipitation in our study region. A temperature dependency of total 18O fractionation from sea water to precipitation is a likely reason for the negative correlation between temperature and meteoric δ18O. Additionally, East Asian summer monsoon (EASM) brought larger rainfall of high δ18O during the warm periods, whereas larger snow/rainfall of low δ18O brought from East Asian winter monsoon (EAWM) in colder periods. δ18O of OT02 had thus reflected changes in terrestrial temperature and meteoric δ18O, which are both strongly related to EASM and EAWM conflicting in a centennial timescale.

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Section: Introductionsupporting

confidence: 86%

Section: Introductionsupporting

confidence: 75%

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Co-evolutions of temperature and monsoonal precipitation patterns from the latest Pleistocene to the mid-Holocene in Japan: Carbonate clumped isotope record of a stalagmite

Katō

Mori²,

Amekawa

et al. 2022

Preprint

Self Cite

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“…have been interpreted as proxies for monsoon strength (Wang, 2001), precipitation amount (Wang et al, 2017) or temperature (Dorale, 1998;Mori et al, 2018) depending on the hydroclimatic setting of each cave site.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of oxygen isotopic exchange between inclusion water and host calcite in speleothems

Uemura¹,

Kina²,

Omine³

2019

Preprint

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Abstract. The oxygen and hydrogen isotopic compositions of water in fluid inclusions in speleothems are important hydroclimate proxies because they provide information on the isotopic compositions of rainwater in the past. Moreover, because isotopic differences between fluid inclusion water and the host calcite provide information on the past isotopic fractionation factor, they are also useful for quantitative estimation of past temperature changes. The oxygen isotope ratio of inclusion water (δ18Ofi), however, may be affected by isotopic exchange between the water and the host carbonate. Thus, it is necessary to estimate the bias caused by this post-depositional effect for precise reconstruction of palaeo-temperatures. Here, we evaluate the isotopic exchange reaction between inclusion water and host calcite based on a laboratory experiment involving a natural stalagmite. Multiple stalagmite samples cut from the same depth interval were heated at 105 °C in the laboratory for 0–80 hours. Then, the isotopic compositions of the inclusion water were measured. In the 105 °C heating experiments, the δ18Ofi values increased from the initial value by 0.7 ‰ and then remained stable after ca. 20 hours. The hydrogen isotope ratio of water showed no trend in response to the heating experiments, suggesting that the hydrogen isotopic composition of fluid inclusion water effectively reflects the composition of past dripwater. We then evaluated the process behind the observed isotopic variations using a partial equilibration model. The experimental results are best explained when we assumed that a thin CaCO3 layer surrounding the inclusion reacted with the water. The amount of CaCO3 that reacted with the water is equivalent to 2 % of the water inclusions in molar terms. These results suggest that the magnitude of the isotopic exchange effect has a minor influence on palaeo-temperature estimates for the Quaternary climate reconstructions.

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“…Greenland δ 18 O is commonly regarded as a proxy dataset for past temperature variability over Greenland, possibly representative for the North Atlantic or northern hemisphere temperature evolution 54 . However, it also represents the most commonly used palaeoclimate and chronological reference dataset for disentangling past climate variability during the last glacial cycle in the Northern Hemisphere 2,3,12,13,39,[116][117][118][119][120] . The Sofular cave δ 13 C dataset 1 represents a reliably and independently U/Th dated terrestrial cave record that would allow for direct comparison with (south-eastern) European loess deposits.…”

Section: Methods Filter Settingsmentioning

confidence: 99%

Smoothed millennial-scale palaeoclimatic reference data as unconventional comparison targets: Application to European loess records

Zeeden

Obreht

Vereș

et al. 2020

Sci Rep

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Millennial-scale palaeoclimate variability has been documented in various terrestrial and marine palaeoclimate proxy records throughout the northern Hemisphere for the last glacial cycle. its clear expression and rapid shifts between different states of climate (Greenland Interstadials and Stadials) represents a correlation tool beyond the resolution of e.g. luminescence dating, especially relevant for terrestrial deposits. Usually, comparison of terrestrial proxy datasets and the Greenland ice cores indicates a complex expression of millennial-scale climate variability as recorded in terrestrial geoarchives including loess. Loess is the most widespread terrestrial geoarchive of the Quaternary and especially widespread over Eurasia. However, loess often records a smoothed representation of millennial-scale variability without all fidelity when compared to the Greenland data, this being a relevant limiting feature in integrating loess with other palaeoclimate records. to better understand the loess proxy-response to millennial-scale climate variability, we simulate a proxy signal smoothing by natural processes through application of low-pass filters of δ 18 O data from Greenland, a highresolution palaeoclimate reference record, alongside speleothem isotope records from the Black Sea-Mediterranean region. We show that low-pass filters represent rather simple models for better constraining the expression of millennial-scale climate variability in low sedimentation environments, and in sediments where proxy-response signals are most likely affected by natural smoothing (by e.g. bioturbation). Interestingly, smoothed datasets from Greenland and the Black Sea-Mediterranean region are most similar in the last ~15 ka and between ~50-30 ka. Between ~30-15 ka, roughly corresponding to the Last Glacial Maximum and the deglaciation, the records show dissimilarities, challenging the construction of robust correlative timescales in this age range. from our analysis it becomes apparent that patterns of palaeoclimate signals in loess-palaeosol sequences often might be better explained by smoothed Greenland reference data than the original high-resolution Greenland dataset, or other reference data. This opens the possibility to better assess the temporal resolution and palaeoclimate potential of loess-palaeosol sequences in recording supra-regional climate patterns, as well as to securely integrate loess with other chronologically better-resolved palaeoclimate records.

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Temperature and seawater isotopic controls on two stalagmite records since 83 ka from maritime Japan

Cited by 14 publications

References 71 publications

Co-evolutions of temperature and monsoonal precipitation patterns from the latest Pleistocene to the mid-Holocene in Japan: Carbonate clumped isotope record of a stalagmite

Co-evolutions of temperature and monsoonal precipitation patterns from the latest Pleistocene to the mid-Holocene in Japan: Carbonate clumped isotope record of a stalagmite

Experimental evaluation of oxygen isotopic exchange between inclusion water and host calcite in speleothems

Smoothed millennial-scale palaeoclimatic reference data as unconventional comparison targets: Application to European loess records

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