Holocene environmental change at the southern coast of Korea based on organic carbon isotope (δ13C) and C/S ratios

Lim, Jaesoo; Lee, Jin Young; Kim, Jin-Cheul; Hong, Sei–Sun; Yang, Dong-Yoon

doi:10.1016/j.quaint.2015.05.017

Cited by 20 publications

(24 citation statements)

References 30 publications

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“…Multiple proxies, including grain size, pollen assemblage, magnetic susceptibility and TOC content, have indicated that Lake Poyang formed its water table through climatic changes 1500 years ago (Wu et al, 1999). The total organic carbon (TOC) content and its carbon isotopic compositions in Lake Poyang have been widely used to interpret paleoclimatic changes in this area because carbon isotope analysis of total organic matter from lake sediments is simple, dependable and efficient (Zeng et al, 2012;Liu et al, 2013;Lim et al, 2015). In one study, the carbon isotopic composition of lacustrine sedimentary total organic matter (TOM) from a 5 ka core was used to indicate relative changes in paleotemperature (Peng et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Precipitation changes recorded in the sedimentary total organic carbon isotopes from Lake Poyang in the Middle and Lower Yangtze River, southern China over the last 1600 years

Hong

Yao

et al. 2016

Quaternary International

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Lake Poyang, the largest freshwater lake of China, is well known for its ecological and hydrological importance as a dynamic wetland and lake system. The climatic change and its effect on ecological and hydrological system of the lake has aroused considerable interest in recent years. So, a sediment core from Lake Poyang was analyzed for δ 13 C total organic matter (δ 13 Corg) to study the hydrological changes in the Lake Poyang catchment. By comparing with modern meteorological data (precipitation and temperature) and hydrological data (volume of runoff), the result showed that the δ 13 Corg values in the sediment are negatively correlated with the total runoff of the 5 main rivers supplying water to Lake Poyang and precipitation in this area over the past 50 years. Therefore, the δ 13 Corg values of the Lake Poyang sediment can serve as reliable proxies for reconstruction of river discharge and regional precipitation, with negative δ 13 Corg values representing increased precipitation in the Lake Poyang area. On this basis, the river discharge and regional precipitation variation in the Lake Poyang catchment over the past 1600 years were discussed. The δ 13 Corg values suggest that the precipitation was highest in the period 340-880 AD, and then decreased with fluctuations to the minimum at approximately 1110 AD. During the period of Medieval Warm Period (1110-1350 AD, MWP), the precipitation was generally in the high level except low amount during period of 1140 AD to 1220AD. The precipitation was in low amount during the Little Ice Age (1350-1620 AD, LIA), except for a sudden increase at approximately 1550-1560 AD. The precipitation continuously increased with little fluctuation from 1610 AD until now. In general, changes in regional precipitation and river discharge were dominated by variations in the Asian Summer Monsoon (ASM) precipitation in the Lake Poyang area, consistent with other records from the ASM-controlled areas of China.

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Section: Introductionmentioning

confidence: 99%

Precipitation changes recorded in the sedimentary total organic carbon isotopes from Lake Poyang in the Middle and Lower Yangtze River, southern China over the last 1600 years

Hong

Yao

et al. 2016

Quaternary International

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“…around the studied region, making available for comparison with our data: in the western coastal estuaries of South Korea, ∼0.1-0.2 × 10 −6 SI (Gyeonggi Bay, Moon et al, 2018), and ∼2-12 × 10 −6 SI (Namyang Bay, Lim et al, 2004); in the southern coast of South Korea, ∼300-650 × 10 −6 SI (Geoje Island, Lim et al, 2014), and ∼50-400 × 10 −6 SI (Yeoja Bay, Lim et al, 2015); in the inner shelf of the southwestern East China Sea, ∼200-250 × 10 −6 SI (Zheng et al, 2010), and ∼100-220 × 10 −6 SI (Zheng et al, 2011). The extremely low k values in the Gyeonggi Bay and the Namyang Bay may result from locally particular layers (e.g., organic-rich layer, siderite-rich layer).…”

Section: Downcore Variation In Magnetic Propertiesmentioning

confidence: 56%

“…Bulk low-field magnetic susceptibility has been widely applied to interpret such sediment environments in South Korea (Park et al, 1998;Moon et al, 2018;Lim et al, 2004;Lim et al, 2014;Lim et al, 2015), yet comprehensive studies using other magnetic properties have been rare. Further studies are needed to comprehensively explore magnetic minerals in terms of their supply into the accommodation space, dissolution or alteration or generation by early diagenesis, abundance, and response to environmental changes.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of a Holocene Sediment Core from the Yeongsan Estuary, Southwest Korea: Implications for Diagenetic Effects and Availability as Paleoenvironmental Proxies

Ahn¹,

Lim

Kim

2021

Front. Earth Sci.

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The sensitivity of magnetic properties, which characterize the mineralogy, concentration, and grain size distribution of magnetic minerals, to environmental processes may provide useful information on paleoenvironmental changes in estuarine environments. Magnetic property studies of estuaries are less common than other environments and, due to the west coast of South Korea having an abundance of estuaries, it provides a good place to study these processes. In this study, we analyzed a variety of magnetic properties based on magnetic susceptibility, hysteresis parameters, progressive acquisition of isothermal remanent magnetization and first-order reversal curve data from a Holocene muddy sediment core recovered from the Yeongsan Estuary on the west coast of South Korea. We examined diagenetic effects on magnetic properties and tested their availability as proxies of paleoenvironmental change. The presence of generally low magnetic susceptibility, ubiquitous greigite-like authigenic magnetic component, and very fine magnetic particle occurrence suggested that the analyzed sediments had undergone considerable early diagenetic alteration. Electron microscopic observations of magnetic minerals support this suggestion. Our results confirm that the use of initial bulk susceptibility as a stand-alone environmental change proxy is not recommended unless it is supported by additional magnetic analyses. We recognized the existence of ferromagnetic-based variabilities related to something besides the adverse diagenetic effects, and have examined possible relationships with sea-level and major climate changes during the Holocene. The most remarkable finding of this study is the two distinct intervals with high values in magnetic coercivity (Bc), coercivity of remanence (Bcr), and ratio of remanent saturation moment to saturation moment (Mrs/Ms) that were well coincident with the respective abrupt decelerations in the rate of sea-level rise occurred at around 8.2 and 7 thousand years ago. It is then inferred that such condition with abrupt drop in sea-level rise rate would be favorable for the abrupt modification of grain size distribution toward more single-domain-like content. We modestly propose consideration of the Bc, Bcr, and Mrs/Ms variability as a potential indicator for the initiation/occurrence of sea-level stillstand/slowstand or highstand during the Holocence, at least at estuarine environments in and around the studied area.

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“…The ratio of sedimentary S to organic C has been widely used to distinguish marine and freshwater sediments27343536. The C–S slope of sediment samples in Dongyuan Lake lies along the freshwater trend27 (~0.05, Fig.…”

Section: Discussionmentioning

confidence: 99%

Sulfur Geochemistry of a Lacustrine Record from Taiwan Reveals Enhanced Marine Aerosol Input during the Early Holocene

Ding

Zheng

et al. 2016

Sci Rep

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Lacustrine record of marine aerosol input has rarely been documented. Here, we present the sulfur geochemistry during the last deglaciation and early Holocene of a sediment core retrieved from the Dongyuan Lake in southern Taiwan. An unusually high sulfur peak accompanying pyrite presence is observed at 10.5 ka BP. Such high sulfur content in lacustrine record is unusual. The δ34S of sulfur varied from +9.5 to + 17.1‰ with two significant positive shifts at 10.5 and 9.4 ka BP. The sources of sulfur and potential processes involving the sulfur isotope variation including bacterial sulfate reduction, volcanic emissions, in-catchment sulfide oxidation and marine aerosol input are discussed. Enhanced marine aerosol input is the most likely explanation for such sulfur peaks and δ34S shifts. The positive δ34S shifts appeared concurrently with the maximum landslide events over Taiwan resulted from enhanced typhoon activities. The synchronicity among records suggests that increased typhoon activities promoted sea spray, and consequently enhanced the marine aerosol input with 34S-enriched sulfate. Our sulfur geochemistry data revealed sea spray history and marine influence onto terrestrial environment at coastal regions. Wider coverage of spatial-temporal lacustrine sulfur geochemistry record is needed to validate the applicability of sulfur proxy in paleoenvironmental research.

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Holocene environmental change at the southern coast of Korea based on organic carbon isotope (δ13C) and C/S ratios

Cited by 20 publications

References 30 publications

Precipitation changes recorded in the sedimentary total organic carbon isotopes from Lake Poyang in the Middle and Lower Yangtze River, southern China over the last 1600 years

Precipitation changes recorded in the sedimentary total organic carbon isotopes from Lake Poyang in the Middle and Lower Yangtze River, southern China over the last 1600 years

Magnetic Properties of a Holocene Sediment Core from the Yeongsan Estuary, Southwest Korea: Implications for Diagenetic Effects and Availability as Paleoenvironmental Proxies

Sulfur Geochemistry of a Lacustrine Record from Taiwan Reveals Enhanced Marine Aerosol Input during the Early Holocene

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