Article
Marine & Freshwater Biology
Yu Cheng, Xinqing Zou, Xiangqian Li, Zengyu Zhao, Xiangyun Zhang, Gang Guo, Jingxing Lin
Summary: The study examines the sediment cores from the Huangqiao sand body in the Yangtze River Delta and identifies four depositional systems, with the stratigraphic architecture and origin mainly controlled by Holocene sea-level changes. The Huangqiao sand body, dated between 7.5 and 4 ka, is not an estuarine sand body but a sand body formed in a tide-dominated delta, providing new evidence for interpreting the origin and evolution of the Yangtze River Delta.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Yi Wu, Shuqing Fu, Haixian Xiong, Yongqiang Zong, Tingping Ouyang, Shasha Peng, Jianxin Cai, Yulin Han, Zhaoyu Zhu
Summary: This study conducted a rock magnetic investigation of Holocene sediments in the Pearl River Delta and revealed the processes of environmental and sedimentary evolution in the region. The study also identified periods of magnetic enrichment associated with monsoons and cooling events.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Xiting Liu, Mingyu Zhang, Anchun Li, Jiang Dong, Kaidi Zhang, Yu Gu, Xin Chang, Guangchao Zhuang, Qing Li, Houjie Wang
Summary: Sedimentary pyrite and C/S ratio have been widely used as indicators for distinguishing between marine and freshwater environments. However, in unsteady marine environments, pyrite formation is limited, resulting in high C/S ratios similar to freshwater environments. By analyzing core sediments from the East China Sea, we found that sediments deposited before 13.1 ka were from freshwater environments, while sediments after 13.1 ka indicated a brackish tidal flat environment. Although there is an overlap in C/S ratios between tidal flat and inner shelf environments, the presence of pyrite aggregates and fine-grained sediments in inner shelf sediments effectively distinguishes these two environments. Additionally, the development of the mud depocentre coincided with a highstand sea level at approximately 7.5 ka.
Article
Geosciences, Multidisciplinary
Yuanyuan Chen, Bing Deng, Yufeng Chen, Daoru Wang, Jing Zhang
Summary: High-resolution seismic surveys conducted off the eastern coast of Hainan Island revealed the distribution and mass budget of Holocene subaqueous clinoform sediments. The study showed that the sediment volume within the Holocene subaqueous clinoform is substantial, influenced by strong tropical weathering and active tectonics. The sediment discharge of the Wanquan River has significantly decreased in recent decades, likely due to human activities.
Article
Geosciences, Multidisciplinary
Yao Zhang, Xianwei Meng, Zongzhu Han, Bingfu Jin, Zhiqing Lai, Jinqing Liu
Summary: In this study, a sediment core was used to reconstruct the sedimentary evolution at the east edge of the central Yellow Sea Mud (CYSM) since approximately 45,000 years ago. The research revealed the significant influence of hydrodynamic regimes, relative sea level changes, and climate variations on the sedimentary evolution.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Yu Liu, Jianhui Wang, Guoqing Han, Xiayan Lin, Guijing Yang, Qiyan Ji
Summary: The East Greenland Polar Front (EGPF) is an important front in the Nordic Seas, and its variations are closely linked to sea ice melting and North Atlantic water recirculation. Analysis using global ocean reanalysis data reveals that the intensity and area of EGPF show significant seasonal and interannual variations, with an increasing trend in recent years.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geology
Susumu Tanabe, Rei Nakashima, Yoshiro Ishihara
Summary: This study examines the sedimentary facies of post-Last Glacial Maximum incised-valley fills in the Tama River Lowland on the west coast of Tokyo Bay. The research highlights the differences in sedimentary facies between river-mouth and delta systems and identifies the relationship between delta formation and sea-level rise.
SEDIMENTARY GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Jin Xu, Chao Huang, Xin Huang
Summary: This study investigates the environmental significance of sediment grain size in the South China Sea by analyzing sediments from the northern part of the sea. The results suggest that one of the grain size components is likely derived from materials transported by the coastal current during the wet season, indicating its sensitivity to climate change and potential for reconstructing East Asian summer monsoon variations. The study also reveals variations in East Asian summer monsoon intensity over the past several millennia, potentially influenced by sea level changes and human activities.
Article
Environmental Sciences
Agoes Soegianto, Holy Ichda Wahyuni, Bambang Yulianto, Latifah Abd Manaf
Summary: The accumulation of metals in mud crabs from Indonesia's East Java estuaries was assessed for potential health effects. The study found that mud crabs from the Solo River estuary had the highest levels of all metals tested. The estimated intake values for all metals were within the acceptable range, but cadmium and chromium showed a potential risk for carcinogenic effects.
ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
(2022)
Article
Geography, Physical
Yuji Ishii, Toru Tamura, Bunnarin Ben
Summary: This study reconstructs the Holocene sedimentary evolution of the Mekong River floodplain in Cambodia, showing rapid deposition in response to sea-level rise before 6.5 ka and localized levee accretion after 6.5 ka. This evolution is comparable to other large river systems in regions with weakening summer monsoons in the middle to late Holocene.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Environmental Sciences
Weiming Xie, Jianwei Sun, Leicheng Guo, Fan Xu, Xianye Wang, Hongyu Ji, Yaoshen Fan, Zheng Bing Wang, Qing He
Summary: Coastal tidal flats are important ecosystems, but they are highly vulnerable to tidal dynamics, sea-level rise, and human activities. This study examined the hydrodynamics, sediment transport, and morphological changes on two tidal flats in the Yellow River Delta with different tidal regimes. The results showed that longer inundation periods under diurnal tides led to more sediment deposition, while semi-diurnal tides resulted in increased wave impact and tidal flat erosion due to lower water depths. These findings highlight the joint role of tidal regime and powerful waves in controlling sediment availability and tidal flat evolution. This has implications for managing erosion and restoring vegetation in the Yellow River Delta.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Shuilan Wu, Shuqin Tao, Xiang Ye, Aijun Wang, Zitong Liu, Chang Ran, Haoshen Liang, Haiqi Li, Yuxin Yang, Wangze Zhang, James T. Liu
Summary: Estuaries, as main interfaces of the Earth system, exhibit strong land-sea interaction in the carbon cycle. They are active intermediate reservoirs for terrestrial and marine matter due to hydrodynamic processes. This study focused on the Minjiang River Estuary (MRE), decoding the source, composition, and distribution of organic matter in surface sediments. The results showed mixed signals of terrestrial and marine sources, with the proportion of terrestrial organic matter decreasing with distance from the land.
Article
Geosciences, Multidisciplinary
Liliana Betancurth, Julio Canon
Summary: The study investigates modern sedimentation in the Atrato River Delta through analyzing sediment samples for grain size, mineral abundances, chemical weathering, and concentrations of major and trace elements. The results indicate a decreasing sediment size pattern towards the bays, with varying transport regimes and a dominance of quartz in mineralogy. High concentrations of oxides suggest oxidation processes with moderate to high weathering.
Article
Chemistry, Multidisciplinary
Yang Wang, Liang Zhou, Xiaoming Wan, Xiujuan Liu, Wanhu Wang, Jiaji Yi
Summary: Studying the sedimentary evolution and Delta initiation of the Hanjiang Delta can help understand its response to sea level and climate changes. In this research, we conducted a multi-proxy analysis using cores from the Hanjiang subaqueous delta to obtain information on the sedimentary environment, sea level change, and climate change. We also discussed the delta's initiation and its primary factors.
APPLIED SCIENCES-BASEL
(2023)
Article
Geosciences, Multidisciplinary
Lina Ai, Zongzhu Han, Xiao Wu, Shengfa Liu, Naishuang Bi, Yoshiki Saito, Xuefa Shi, Houjie Wang
Summary: This study provides insights into the environmental and climate changes in the Central Yellow Sea Mud (CYSM) during the Holocene. The contributions of the Yellow River and Yangtze River to the CYSM sedimentation varied over time, with sea level rise, weakened East Asian Summer Monsoon, and human activities playing key roles in sediment transport and accumulation.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Engineering, Civil
Hao Wang, Xiangbin Ran, Alexander F. Bouwman, Junjie Wang, Bochao Xu, Zhaoliang Song, Shaobo Sun, Qingzhen Yao, Zhigang Yu
Summary: This study analyzed the sources, distribution, and export of particulate organic carbon (POC) in the Changjiang River to explore the impacts of dam construction. The results showed that dam construction resulted in changes in POC composition, with a decrease in allochthonous POC export and an increase in autochthonous POC. The study also found that POC trapping in nine large rivers impacted by dams accounted for 12% of global riverine POC export. These changes have significant impacts on the estuarine carbon cycle.
JOURNAL OF HYDROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Bochao Xu, M. Bayani Cardenas, Isaac R. Santos, William C. Burnett, Matthew A. Charette, Valenti Rodellas, Sanzhong Li, Ergang Lian, Zhigang Yu
Summary: Radium isotopes are important tools in oceanography and hydrology research. Current radium mass balance models often overlook the impact of particle scavenging on dissolved radium removal. We built a global ocean Ra-226 mass balance model and reevaluated the importance of particle scavenging. Our study found that particle scavenging is the major pathway for Ra-226 removal in the upper ocean.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Wen Liu, Chunqian Li, Pinghe Cai, Shibin Zhao, Jinjia Guo, William C. Burnett, Shasha Song, Guangquan Chen, Bochao Xu
Summary: A new method for measuring (224)Ra in sediments is established using a pulsed ionization chamber (PIC). The results show that this method is efficient, with a measurement efficiency of 0.22 +/- 0.02 cpm/dpm, and has a high precision of +/- 8% for (224)Ra and Th-228 measurements. It can be used to assess the Ra-224/Th-228 disequilibrium in sediments and quantify the deficits and ingrowth to equilibrium of 224Ra. The PIC device is simple to use, inexpensive and portable, making it suitable for field determinations of sediment samples.
Article
Multidisciplinary Sciences
Shasha Song, Isaac R. Santos, Huaming Yu, Faming Wang, William C. Burnett, Thomas S. Bianchi, Junyu Dong, Ergang Lian, Bin Zhao, Lawrence Mayer, Qingzhen Yao, Zhigang Yu, Bochao Xu
Summary: The authors map the global distribution of the mixed layer in coastal ocean sediments, based on a neural network model. These observations reveal that mixing can accelerate organic matter degradation and reduce carbon storage in the coastal ocean.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Shibin Zhao, Meng Li, William C. Burnett, Kai Cheng, Chunqian Li, Jinjia Guo, Songling Yu, Wen Liu, Tong Yang, Natasha T. Dimova, Guangquan Chen, Zhigang Yu, Bochao Xu
Summary: Submarine groundwater discharge (SGD) is an important component of global water and biogenic element sources, and a significant pathway for material exchange in coastal ecosystems. Radon isotope is an excellent tracer for studying SGD, but conventional measurement methods have technical disadvantages. Researchers have developed a portable submersible radon determination approach that produces high precision and high resolution observations.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Sanzhong Li, Lijun Liu, Yanhui Suo, Xiyao Li, Jie Zhou, Zhaoxia Jiang, Hongxiang Guan, Guozheng Sun, Lei Yu, Peng Liu, Liming Dai, Xiaohui Li, Long Chen, Yanyan Zhao, Yuhua Wang, Bochao Xu
Summary: This paper proposes a new scientific concept called Carbon tectonics, which involves the tectonic processes of the Earth beyond the lithosphere and their relationship with carbon circulation. Carbon tectonics covers various aspects of the Earth system and is expected to form a new research paradigm and promote interdisciplinary intersections.
CHINESE SCIENCE BULLETIN-CHINESE
(2023)
Article
Oceanography
Tiezhu Mi, Shibin Zhao, Minzhi Qiu, Bochao Xu, Qingzhen Yao, Yu Zhen, Zhiqing Lai, Fang Zhang, Zhigang Yu
Summary: This study explored the feasibility of element analysis of Aurelia aurita, a representative Scyphozoan jellyfish outbreak species in China, and found that Sr/Ca content ratios may be used as a potential proxy to reveal the living environment variations the Scyphozoan jellyfish has experienced, such as temperature history.
ACTA OCEANOLOGICA SINICA
(2022)
Article
Multidisciplinary Sciences
Xingqian Cui, Alfonso Mucci, Thomas S. Bianchi, Ding He, Derrick Vaughn, Elizabeth K. Williams, Chuning Wang, Craig Smeaton, Katarzyna Koziorowska-Makuch, Johan C. Faust, Alain F. Plante, Brad E. Rosenheim
Summary: Research suggests that organic carbon in fjord sediments is more susceptible to decomposition, which can dampen atmospheric CO2 decrease during glacial-interglacial climate fluctuations through negative carbon cycling loops.
Article
Limnology
Xiaoyi Guo, Huamao Yuan, William Burnett, Han Zhang, Ergang Lian, Haowei Xu, Zhigang Yu, Bochao Xu
Summary: Ba/Ca ratios of benthic foraminiferal shells can be used as a qualitative proxy of submarine groundwater discharge (SGD) and applied for long-term historical SGD records.
LIMNOLOGY AND OCEANOGRAPHY LETTERS
(2023)
Article
Geochemistry & Geophysics
Bin Zhao, Peng Yao, Xuchen Wang, Thomas S. Bianchi, Michael R. Shields, Christian Schroder, Zhigang Yu
Summary: The aim of this study was to investigate the changes in the bound form of reactive iron (Fe-R) and organic carbon (OC) from estuarine suspended particulate matter (SPM) to coastal sediments. The results showed that the percentage of OC bound to Fe-R remained stable in SPM and mobile-mud sediments, indicating that binding with Fe-R is a potential long-term protection mechanism for terrestrial OC. Fe-R was mainly associated with pre-aged soil OC of terrestrial plant origin.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Environmental Sciences
Judith A. Rosentreter, Goulven G. Laruelle, Hermann W. Bange, Thomas S. Bianchi, Julius J. M. Busecke, Wei-Jun Cai, Bradley D. Eyre, Inke Forbrich, Eun Young Kwon, Taylor Maavara, Nils Moosdorf, Raymond G. Najjar, V. V. S. S. Sarma, Bryce Van Dam, Pierre Regnier
Summary: This article analyzes data from 738 observation sites and finds that coastal ecosystems have a certain absorption effect on greenhouse gases in the atmosphere, but methane and nitrous oxide emissions counteract the absorption of carbon dioxide. Southeast Asia, North America, and Africa are identified as hotspots for coastal greenhouse gas absorption.
NATURE CLIMATE CHANGE
(2023)
Article
Oceanography
Yifei Luo, Jie Shi, Xinyu Guo, Xinyan Mao, Peng Yao, Bin Zhao, Lin Chen, Yucheng Wang
Summary: The intensity of Zhejiang coastal upwelling (ZCU) is the principal factor influencing the coastal primary productivity of the East China Sea (ECS) in summer, while the Kuroshio intrusion (KI) has a relatively smaller impact. Strong ZCU leads to higher nutrient concentrations and greater nutrient supplies in nearshore areas. The years 2013 and 2018 were identified as strong and weak ZCU years, respectively, with significant differences in nutrient concentrations and phytoplankton biomass.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Xueshi Sun, Limin Hu, Xiang Sun, Dejiang Fan, Ming Liu, Houjie Wang, Zuosheng Yang, Peng Cheng, Xiaohang Liu, Zhigang Guo
Summary: This study reveals that the Eastern China Marginal Seas (ECMS) are one of the largest reservoirs of mercury (Hg) in the global Hg cycle and play a dominant role in regulating the oceanic Hg cycle and budgets.
GLOBAL BIOGEOCHEMICAL CYCLES
(2023)
Article
Ecology
Xing Chen, Jiwen Liu, Xiao-Yu Zhu, Chun-Xu Xue, Peng Yao, Liang Fu, Zuosheng Yang, Kai Sun, Min Yu, Xiaolei Wang, Xiao-Hua Zhang
Summary: This study provides a comprehensive characterization of the microbial community, metagenome, and metagenome-assembled genomes (MAGs) in the world's deepest yongle blue hole (YBH). It reveals the shifting composition and function of the microbial community across different zones, as well as the variations in carbon fixation processes and energy metabolisms. The findings deepen our understanding of carbon fixation and its biogeochemical impacts in relation to oxygen availability.
ISME COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Peng Li, Guoyang Wang, Cunren Liang, Houjie Wang, Zhenhong Li
Summary: This article examines the contribution of local land subsidence (LLS) in the Yellow river delta (YRD) to relative sea level rise (SLR) and the risk of coastal flooding. It proposes a method to estimate coastal inundation by combining radar interferometry (InSAR)-derived LLS and SLR. The study reveals that LLS contributes significantly to flood risk in the YRD, with subsiding areas exceeding 50 mm/yr and rates reaching over 300 mm/yr. Under different greenhouse gas emissions scenarios, the research presents inundation scenarios and highlights the urgent need for mitigation measures to prevent future coastal flooding.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2023)