Drastic hydrographic changes inferred from radiolarian assemblages in the central Japan Sea since the Last Glacial Maximum

Zhi, Dong; Shi, Xuefa; Zou, Jianjun; Zou, Xinqing; Chen, Mu‐Hong; Zhang, Qiang; Kandasamy, Selvaraj; Ge, Chendong; Liu, Ling; Itaki, Takuya; Liu, Yanguang

doi:10.1016/j.margeo.2020.106295

Cited by 13 publications

(7 citation statements)

References 65 publications

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“…Previous studies have demonstrated that the TWC continuously entered the JS at around 9 to 7 ka (Itaki et al, 2004;Dong et al, 2020;Zou et al, 2021), which is almost synchronous with the development of the LCC. Therefore, we infer that 8 ka represents the critical time indicator of the formation of the modern surface circulation system in the JS.…”

Section: Development Of the Liman Cold Current Since The Middle Holocenementioning

confidence: 82%

“…The abrupt increase in planktic foraminifera δ 18 O values indicated the inflow of relatively saline and cold water from the East China coast into the JS through the Tsushima Strait during HS1 (Domitsu and Oda, 2006). Redox-sensitive elements, radiolarian proxies, and reappearance of benthic foraminifera suggest that deep-water ventilation was enhanced in the eastern and centeral JS (Domitsu and Oda, 2006;Zou et al, 2012;Dong et al, 2020;Dong et al, 2021). In addition to the provenance change documented in core KCES1 (Zou et al, 2021), this evidence demonstrated that an intrusion of paleo-TWC into the JS due to the reopening of the Tsushima Strait during HS1.…”

Section: Persistent Sea Ice Coverage During the Heinrich Stadialmentioning

confidence: 99%

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Geochemical and Isotopic Evidence for Provenance of the Western Sea of Japan Over the Last 30000 Years

et al. 2021

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The Sea of Japan (JS) is a unique marginal sea in the western North Pacific that is characterized by four shallow straits. It can provide information about the paleoenvironment, for instance indicating variations in the East Asian Monsoon, Tsushima Warm Current, sea ice coverage, and Westerly Jet. Compared with other marginal seas in the western North Pacific, the JS is currently the only marginal sea without influx from large rivers. It is, therefore, of interest to determine the source of terrigenous sediments over time, particularly in the western JS, which has been less investigated in previous reports. In this study, a suite of multi-proxies including Sr and Nd isotopes and minor elements were measured for fine fractions (<63 μm) of core LV53-18-2 that were recovered from the western JS over the last 30 ka. Our results show that the sediments are rich in volcanic detritus and that the provenance of terrigenous sediments in the western JS is mainly derived from the arid region in northern China and coastal areas in the Far East. During the Last Glacial Maximum, the increased coverage of sea ice may have contributed to the accumulation of terrigenous debris. Meanwhile, the stronger East Asian Winter Monsoon and expansion of the Westerly Jet over northern China also carried more dust to the study area. However, the weakened atmospheric circulation and rise in sea level, induced by the ascending boreal insolation during the last deglaciation and early Holocene, remarkably reduced input of terrigenous debris, and the intense melting of sea ice delivered an amount of detritus from coastal areas to the research area. After 8 ka, the high stand sea level and opening of the Tatar Strait may have led to the development of the Liman Cold Current, which transports large quantities of volcanic materials to the study area continuously and produces more positive Eu anomalies, radiogenic εNd, and depleted ΣREE.

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Section: Development Of the Liman Cold Current Since The Middle Holocenementioning

confidence: 82%

Section: Persistent Sea Ice Coverage During the Heinrich Stadialmentioning

confidence: 99%

Geochemical and Isotopic Evidence for Provenance of the Western Sea of Japan Over the Last 30000 Years

et al. 2021

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“…Over the past 35 kyr BP, the eustatic sea level would have regulated the inflow through the Tsushima Strait and thereby the surface salinity of the Japan Sea (Dong et al., 2020; Tada et al., 2018). During the glacial period, especially during the LGM, the inflow through the Tsushima Strait, restricted by the dropping sea level, was in short supply of the salt input to the Japan Sea.…”

Section: Discussionmentioning

confidence: 99%

“…The upper 200-m layer of the Japan Sea, which is above the permanent pycnocline, is profoundly affected by the throughflows (Isobe, 2020;Oba & Irino, 2012;Yanagi, 2002). Coupled with the air-sea heat flux and freshwater input, the throughflows maintain the heat and salinity budget balance of the upper Japan Sea (Dong et al, 2020;Kida et al, 2016;Wu et al, 2020). As partial original water source, the inflow through the Tsushima Strait was also suggested to contribute to the formations of the intermediate and deep water masses (Gamo et al, 2014;S.…”

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confidence: 99%

Low Sea Surface Salinity Event of the Japan Sea During the Last Glacial Maximum

Zheng

Guo

Yang

et al. 2023

Paleoceanog and Paleoclimatol

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Abnormal lightening of the oxygen isotope ratio (δ18O) of planktonic foraminifera during the Last Glacial Maximum (LGM, ∼21 kyr BP) suggests that the Japan Sea had experienced a low sea surface salinity event at that time. However, the exact value and timing of minimum salinity have been controversial so far. To address this issue, we adopt a simple box model and reconstruct the sea surface salinity in the Japan Sea (SJP) over the past 35 kyr with a focus on the LGM period. In particular, as input data for the box model, the inflow transport through the Tsushima Strait (Q) is converted from sea level evolution using a newly defined relationship, in which Q reduces non‐linearly with the sea level reduction through a dynamically‐constrained realistic ocean model. Meanwhile, another input data of the box model, sea surface freshwater flux (precipitation minus evaporation (P‐E) evolution), is obtained by averaging multi‐paleoclimate models (PMIP3 and MIROC4m models) results. The reconstructed SJP using the box model reached its minimum value (20.2) at 20 kyr BP with a high coefficient of determination (R2) for δ18O (0.81, p << 0.01). Further analysis demonstrates that the above non‐linear relationship, determined by h3/2 (h is the strait depth), promises a more reasonable reconstruction of the SJP evolution. It is also concluded that both the value and timing of the minimum SJP depend on the Q evolution, and the P‐E evolution can modify the former. Therefore, the combination of Q and P‐E determines the exact value and timing of minimum salinity.

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“…In addition, the surface hydrographic conditions that are similar to the modern mode in the East Sea have been shown to be established since ca. 7 ka (Dong et al., 2020), implying that the assumption of a constant surface reservoir age may hold true for this time period. This is similar to the situation in the southwest Pacific Ocean where surface reservoir ages are shown to be constant during the Holocene (Sikes et al., 2000).…”

Section: Discussionmentioning

confidence: 99%

Holocene Tephrostratigraphy in the East Sea/Japan Sea: Implications for Eruptive History of Ulleungdo Volcano and Potential for Hemispheric Synchronization of Sedimentary Archives

et al. 2022

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Active volcanic centers in East Asia have huge potential to pose major volcanic hazards on modern human society. The area around the East Sea (Japan Sea) is one critical element of this, with a population of ca. 200 million along the Korean Peninsula and the Japanese Islands at risk from volcanic hazards. The Ulleungdo in the East Sea (Figure 1) is one of such hazardous volcanoes, which is responsible for one of the largest Holocene eruptions in East Asia (Machida et al., 1984). Ash from the eruption (U-Oki) blanketed large areas of the East Sea and reached

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Drastic hydrographic changes inferred from radiolarian assemblages in the central Japan Sea since the Last Glacial Maximum

Cited by 13 publications

References 65 publications

Geochemical and Isotopic Evidence for Provenance of the Western Sea of Japan Over the Last 30000 Years

Geochemical and Isotopic Evidence for Provenance of the Western Sea of Japan Over the Last 30000 Years

Low Sea Surface Salinity Event of the Japan Sea During the Last Glacial Maximum

Holocene Tephrostratigraphy in the East Sea/Japan Sea: Implications for Eruptive History of Ulleungdo Volcano and Potential for Hemispheric Synchronization of Sedimentary Archives

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