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Coral records of Mid-holocene sea-level highstands and climate responses in the northern South China Sea

Acta Oceanologica Sinica 2024年第2期43卷 43-57页

作者： Yuanfu Yue Lichao Tang Kefu Yu Rongyong Huang School of Marine Sciences Coral Reef Research Center of ChinaGuangxi UniversityNanning 530004China Guangxi Laboratory on the Study of Coral Reefs in the South China Sea Nanning 530004China

High-resolution sea-level data and high-precision dating of corals in the northern South China Sea(SCS)during the holocene provide a reference and historical background for current and future sea-level changes and a basis for scientific assessment of the evolutionary trend of coral reefs in the SCS.Although sporadic studies have been performed around Hainan Island in the northern SCS,the reconstructed sea level presents different values or is controversial because the indicative meaning of the sea-level indicators were neither quantified nor uniform criteria.Here,we determined the quantitative relationship between modern living coral and sea level by measuring the top surfaces of 27 live Porites corals from the inner reef flat along the east coast of Hainan Island and assessed the accuracy of results obtained using coral as sea-level indicators.Additionally,three in situ fossil Porites corals were analyzed based on elevation measurements,digital X-ray radiography,and U-Th dating.The survey results showed that the indicative meanings for the modern live Porites corals is(146.09±8.35)cm below the mean tide level(MTL).It suggested that their upward growth limit is constrained by the sea level,and the lowest low water is the highest level of survival for the modern live Porites corals.Based on the newly defined indicative meanings,6 new sea-level index points(SLIPs)were obtained and 19 published SLIPs were recalculated.Those SLIPs indicated a relative sea level fluctuation between(227.7±9.8)cm to(154.88±9.8)cm MTL between(5393±25)cal a BP and(3390±12)cal a BP,providing evidences of the Mid-holocene sea-level highstand in the northern SCS.Besides that,our analysis demonstrated that different sea-level histories may be produced based on different indicative meanings or criteria.The dataset of 276 coral U-Th ages indicates that coral reef development in the northern SCS comprised the initial development,boom growth,decline,and flourishing development again.A comparison with regional records indicated that synergistic ef

关键词： northern South China Sea middle holocene sea-level highstand Porites corals climate response

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middle holocene hunting-gathering culture and environmental background of the steppe area of northern China

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Science China Earth Sciences 2022年第7期65卷 1317-1327页

作者： Jiacheng MA Xinying ZHOU Shixia YANG Huiyun RAO Jiaoyang LI Songmei HU Yimin YANG Xiaoqiang LI Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China University of Chinese Academy of Sciences Beijing 100049China Shanxi Academy of Archaeology Xi'an 710075China

For a long time,the academic community has known very little about hunter-gatherers in the steppe area of northern China in the mid-holocene.This article reports on the Ula Usu West site in Siziwangqi Banner,Inner Mongolia,including basic information about the site,animal bones,lithic artifacts and the environmental background.The age of the site is 4.8–4.4 cal.kyr BP,placing it in the Late Neolithic period.Considering integrated evidence from flotation,zooarchaeology,ZooMS analysis and lithic artifacts,the preliminary inference is that the population lived in a hunting-gathering economy.They used lithic tools represented by arrowheads to hunt mainly Antilopinae animals(e.g.,Procapra gutturosa).Pollen analysis suggests that the climate was relatively humid,providing advantageous living conditions for the population.The climate evidence is consistent with a warm event at approximately 4.7 kyr BP.A dry-cold event(4.5–4.0 kyr BP)and the gradual expansion of agriculture and breeding might have resulted in the final decline of the population.This article provides new materials for research on the“last”hunter-gatherers in the steppe area of northern China.

关键词： Ula Usu West site middle holocene Northern steppe Hunting-gathering Palynolog

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The development process of a temperate montane peatland and its controlling factors since the middle holocene

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Science China Earth Sciences 2023年第3期66卷 594-608页

作者： Yanmin DONG Hongkai LI Shengzhong WANG Hongshi HE Key Laboratory of Geographical Process and Ecological Security in Changbai Mountains Ministry of EducationSchool of Geographical SciencesNortheast Normal UniversityChangchun 130024China State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration Northeast Normal UniversityChangchun 130024China School of Natural Resources University of MissouriMO 65211USA

Peatlands are some of the largest carbon reservoirs in terrestrial ecosystems and play a key role in the global carbon cycle.Understanding peatland development,carbon accumulation processes,and the peatland response to varying forcing factors over different temporal and spatial scales helps reveal the underlying processes and general patterns of these ecosystems.To assess the role of climate and local conditions in peatland development,the basal samples from 23 peat cores and three well dated long peat cores were used to explore peatland initiation,lateral expansion,and carbon accumulation rate in the Baijianghe peatland located in the Changbai Mountains,Northeast China.Our results reveal that the Baijianghe peatland was initiated from forest conditions at 7.9 cal.kyr BP and then expanded laterally by paludification.The rapid expansion between 5 and4 cal.kyr BP likely resulted from high precipitation and gentle topography.The mean carbon accumulation rates of the three long peat cores were 36.3,39.1 and 48.4 g C m^(-2)yr^(-1),respectively,which are higher than rates from the northern peatlands.Both climate and local conditions have exerted an important influence on carbon accumulation rates in the Baijianghe peatland since the middle holocene.The carbon accumulation patterns between 5 and 1.5 cal.kyr BP were probably linked to local conditions rather than climatic settings,including topography,hydrological conditions,and plant composition.The consistently decreasing carbon accumulation rate values at all locations within the BJH peatland over the last 1.5 cal.kyr BP suggests that climate is the primary control.This study highlights the varying primary controls on the process of peatland development and reveals the important role of local conditions in carbon accumulation.

关键词： Paludification Peatland lateral expansion Carbon accumulation rate Northeast China middle holocene

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Geochemical and Grain-Sized Implications for Provenance Variations of the Central Yellow Sea Muddy Area Since the middle holocene

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Journal of Ocean University of China 2020年第3期19卷 577-588页

作者： AI Lina HAN Zongzhu WU Xiao SAITO Yoshiki WANG Houjie College of Marine Geosciences/Key Laboratory of Submarine Geosciences and Prospecting Techniques MOEOcean University of ChinaQingdao 266100China Laboratory of Marine Geology Qingdao National Laboratory of Marine Science and TechnologyQingdao 266237China Estuary Research Center Shimane UniversityMatsue 690-8504Japan Geological Survey of Japan AISTTsukuba 305-8567Japan

Based on high-resolution analysis to a 280-cm long sediment core obtained from the muddy area in the central Yellow Sea, we examined the provenance of muddy sediments and discussed the changing marine sedimentary environment since the middle holocene. The results indicated that fine-grained sediments in the muddy area were mainly derived from the Huanghe(Yellow River) and Changjiang(Yangtze River) with considerable stepwise variations during the past 6.6 kyr. The Yellow Sea Warm Current was initiated at 6 kyr when the sea level was high together with the enhanced East Asian Winter Monsoon. These in combination established the framework of shelf circulation in the Yellow Sea that began to trap the river-derived fine-grained sediments. From 4.9 kyr to 2.8 kyr, both the Kushiro Current and East Asian Monsoon were significantly weakened, reducing the delivery of Changjiang sediments to the muddy area. As a result, the sediments were mainly originated from the Huanghe. From 2.8 kyr to 1.5 kyr the continuously weakened East Asian Winter Monsoon and enhanced Yellow Sea Warm Current entrapped more fine-grain sediments. Whereas the enhanced East Asian Winter Monsoon and the human caused increase in sediment load of the Huanghe since 1.5 kyr, and direct delivery of Huanghe sediments to the Yellow Sea during 1128–1855 AD might dominated the sedimentation in the study area. The stepwise variations of the sediment provenance and composition of the Central Yellow Sea muddy sediments are of importance to understanding the formation of muddy deposit in the central Yellow Sea and the associated variations of marine environment since the middle holocene.

关键词： sediment provenance rare earth elements grain size central Yellow Sea mud middle holocene

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