Provenance of late Quaternary sediments on the southwestern slope of the Ulleung Basin, East/Japan Sea

Um, In-Kwon; Choi, Man-Sik; Bahk, Jang-Jun; Chun, Jong-Hwa

doi:10.1016/j.quaint.2017.04.013

Cited by 14 publications

(3 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most studies have focused mainly on coastal areas, while research on offshore areas is very limited [26][27][28]. Research associated with Ulleungdo has focused on the connectivity of the seabed topography and floating organisms such as fish and plankton [29][30][31][32]. In addition, many studies have been conducted based on the increase in water temperature and CO 2 [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Understanding the Spatial and Temporal Distribution and Environmental Characteristics of Polychaete Assemblages in the Coastal Waters of Ulleungdo, East Sea of Korea

Kim

2021

JMSE

View full text Add to dashboard Cite

The coastal area of Ulleungdo in the East Sea has experienced large climate and environmental changes. However, research on marine benthic animals in this area has been very limited. In the present study, we investigated the spatial and temporal distribution of benthic polychaetes to determine their seasonal adaptability to environmental changes in the coastal waters of Ulleungdo in 2019. In total, 116 species (34 families) of polychaetes were identified with an average of 25 species per site. The average density was 772.8 individuals m−2, with the highest density in August and the lowest in February. The dominant species were Pseudobranchiomma zebuensis (15.6%), Scolelepis sp. (8.6%), Haplosyllis spongiphila (7.3%), and Lumbrineris nipponica (6.3%). The main factors affecting polychaete community structure were water depth and sediment type (gravel, sand, silt, clay). Based on cluster analysis, the polychaetes tended to group mainly in winter and summer with P. zebuensis and Syllis sp. contributing to the grouping. The dominant species was the suspension feeder, which correlated highly with habitat sediment type and was substantially consistent with the coast of Dokdo. Some species overlapped in the East Sea coast, but the number and diversity of species were higher in Ulleungdo. Our study results confirm the ecological characteristics of benthic polychaetes of Ulleungdo and provide information for future monitoring of the environmental and biological changes in the East Sea.

show abstract

Section: Introductionmentioning

confidence: 99%

Understanding the Spatial and Temporal Distribution and Environmental Characteristics of Polychaete Assemblages in the Coastal Waters of Ulleungdo, East Sea of Korea

Kim

2021

JMSE

View full text Add to dashboard Cite

show abstract

“…the EKWC), although aeolian processes seem to contribute to a certain extent. Based on the sediment geochemistry, Um et al (2017) reported that the provenance of fine-grained sediments on the southwestern slope of the Ulleung Basin was also the Nakdong River in addition to Chinese rivers. The mineralogical analyses of sediments in the Hupo Trough showed that the mineral composition of the Holocene sediments was consistent (Jun et al, 2014), confirming that there was no significant change in the sediment provenance.…”

Section: Discussionmentioning

confidence: 99%

Holocene sedimentation in the Hupo Trough of the southwestern East Sea (Japan Sea) and development of the East Korea Warm Current

et al. 2021

View full text Add to dashboard Cite

Various sediment properties, such as mean grain size, total organic carbon, total nitrogen, C/N ratio, CaCO3, and biogenic opal content, were analyzed for a box core (BC02; 45 cm long) and a gravity core (GC02; 628 cm long), which were collected from the western margin of the Hupo Trough located off the eastern coast of Korea. The study area has been affected by the East Korea Warm Current (EKWC), a branch of the Tsushima Warm Current (TWC). The analytical results obtained for BC02 and the upper part of GC02 were in agreement, affirming the core-top preservation of GC02. Based on the corrected calibrated AMS 14C dates, the sedimentation rate of GC02 changed abruptly at ~8.2 ka from ~4.0–10.2 cm/kyr in the lower part to ~56.6–91.0 cm/kyr in the middle to upper part. This corresponds to the lithologic change from sandy mud to mud sediments showing the mean grain size change from 6.9 to 46.0 μm. Diverse paleoceanographic proxies representing the surface water condition exhibited varying degree of change at ~8.2 ka, after which all the properties remain almost unchanged, implying stable and continuous depositional conditions following the complete development of the EKWC. Furthermore, it indicated that the sediment depositional conditions in the Hupo Trough in response to the EKWC might have stabilized at ~8.2 ka since the opening of the Korea Strait during the Holocene sea level rise. Moreover, microfossil data from previous studies on the establishment of the TWC in the East Sea (Japan Sea) support our interpretation that the sediment properties revealed the Holocene development of the EKWC in the Hupo Trough.

show abstract

“…These suggested that terrigenous material in the southwestern JS are mainly from China mainland via the Yellow River since 21.1 ka and that the portion from Taiwan increases after 7.2 ka. REEs provenance discrimination revealed that sediments on the slope of the Ulleung Basin are a mixture of sediments from Chinese rivers and the Nakdong River, and sedimentation was controlled by the East Asian Winter Monsoon (EAWM) and sea-level change during the last glaciation (Um et al, 2017). The latest Sr-Nd isotope result of core KCES1 in southwestern JS further demonstrated that the terrigenous material is derived from mainland China, transported by the Yangtze and Yellow Rivers from 42 to 7 ka, and dominated by Yangtze river-derived sediments after 7 ka (Zou et al, 2021; Figure 9B).…”

Section: Variations In Terrigenous Provenancementioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Provenance of late Quaternary sediments on the southwestern slope of the Ulleung Basin, East/Japan Sea

Cited by 14 publications

References 64 publications

Understanding the Spatial and Temporal Distribution and Environmental Characteristics of Polychaete Assemblages in the Coastal Waters of Ulleungdo, East Sea of Korea

Understanding the Spatial and Temporal Distribution and Environmental Characteristics of Polychaete Assemblages in the Coastal Waters of Ulleungdo, East Sea of Korea

Holocene sedimentation in the Hupo Trough of the southwestern East Sea (Japan Sea) and development of the East Korea Warm Current

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

Contact Info

Product

Resources

About