Article
Environmental Sciences
Shenghui Jiang, Xin Ni, Haiyan Cheng, Guangming Zhao
Summary: We analyzed the heavy metal (Cr, Cu, Ni, Pb, and Zn) content and particle size of surface sediment samples taken from 123 sites in the Bohai Strait of China. All five heavy metals showed a similar distribution in the strait, with lower concentrations in the middle and higher concentrations at the sides. The Laotieshan Channel had the lowest heavy metal content due to rapid currents. Only 1.6% of the sample sites were polluted by Cr and Cu, according to our pollution index (Pi) calculations. Few sites were polluted by heavy metals based on geo-accumulation index (Igeo) values. Pb levels were influenced by terrigenous inputs and clay adsorption, while the levels of other heavy metals (Cr, Cu, Ni, and Zn) were mainly controlled by terrigenous inputs.
MARINE POLLUTION BULLETIN
(2023)
Article
Oceanography
Hongwei Liu, Chongguang Pang, Dezhou Yang, Zhiliang Liu
Summary: The study examines the seasonal variation in material exchange through the Bohai Strait, indicating significant changes in suspended sediment flow and direction in different seasons. Freshwater discharge from the Yellow Sea plays a key role in sediment transport, while factors such as airflow, current velocity, and sediment concentration also influence sediment flux.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Geography, Physical
Lin Liu, Houjie Wang, Zuosheng Yang, Yongyong Fan, Xiao Wu, Limin Hu, Naishuang Bi
Summary: This study investigates the temporal-spatial variations in the grain size of sediments from the Huanghe delta coast and reveals the key factors and environmental significance of sediment variability. The results show that the sediments have become coarser in recent years, which has significant implications for the evolution of river deltas and carbon-related biogeochemical processes.
Article
Environmental Sciences
Xiaokun Ding, Xinyu Guo, Huiwang Gao, Jie Gao, Jie Shi, Xiaojie Yu, Zhaosen Wu
Summary: The Bohai Sea is heavily impacted by eutrophication, with nutrient concentrations and ratios exhibiting seasonal variations. Biological processes play a key role in seasonal nutrient cycling, while external inputs are significant in summer. The N/P ratio in surface water fluctuates significantly, with a peak in summer and a trough in winter.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Kaoru Ichikawa
Summary: Seasonal variations in currents in the Makassar Strait are significant and related to both the monsoon and sea surface height anomaly (SSHA) difference between the Pacific and Indian Oceans. However, the dynamics of these variations have not been well discussed due to unreliable data. In this study, altimetry data from the Jason satellite is used to investigate the seasonal SSHA variations in and around the Makassar Strait. The results show that the SSHA variations are in phase throughout the strait but decrease in amplitude with distance from the southern shallow area.
Article
Remote Sensing
Iskhaq Iskandar, Qurnia Wulan Sari, Riza Yuliratno Setiawan, Eko Siswanto, Joji Ishizaka, Amirotul Bahiyah, Wijaya Mardiansyah, Ardiansyah Desmont Puryajati
Summary: This study evaluated the driving factors behind the seasonal and interannual variability of surface chlorophyll-a (chl-a) in the Karimata Strait. The results showed that high chl-a concentrations were observed during the northwest monsoon season, attributed to increased allochthonous nutrients from river discharges caused by increased precipitation over land. During the southeast monsoon season, a high chl-a concentration was observed during the La Nina event, associated with anomalously high precipitation over land.
INTERNATIONAL JOURNAL OF REMOTE SENSING
(2023)
Review
Computer Science, Interdisciplinary Applications
Shuai Yuan, Chengyu Liu, Xueqin Liu, Yuan Chen, Yujin Zhang
Summary: The Bohai Sea is a key marine economic zone in China with frequent human social and economic activities. Remote sensing technology has become the dominant approach for sea ice monitoring, forming a regional monitoring mode. Future research work will focus on diverse monitoring requirements and the development of remote sensing technologies for sea ice monitoring in the Bohai Sea.
EARTH SCIENCE INFORMATICS
(2021)
Article
Geosciences, Multidisciplinary
Junjun Zhou, Xiaofan Luo, Jingen Xiao, Hao Wei, Wei Zhao, Zijia Zheng
Summary: The nutrient flux through Bering Strait shows significant interannual variability in winter and summer, with a key role played by the shelf-slope exchange near Cape Navarin. During summer, the poleward nitrate flux is mainly influenced by volume transport through Bering Strait and upstream advection rather than biological activity.
JOURNAL OF MARINE SYSTEMS
(2021)
Article
Geography, Physical
Johannes Hardeng, Jostein Bakke, Pierre Sabatier, Eivind Wilhelm Nagel Storen, Willem Van der Bilt
Summary: River flood hazards have increased worldwide due to human encroachment and global climate change. A study in Norway investigated lake sediments to reconstruct flood events over the past 8000 years, revealing two different flood regimes triggered by rainfall and snowmelt. Comparisons with paleoclimate reconstructions showed a shift towards more snowmelt-triggered floods in the late Holocene, following a period dominated by extreme precipitation-triggered floods.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Xiaoxiong Wang, Xiaogang Chen, Jianan Liu, Fenfen Zhang, Linwei Li, Jinzhou Du
Summary: The study investigated the seasonal distribution of Rn-222 in the Yellow-Bohai Sea and found that the distribution of Rn-222 in surface waters is influenced by rivers, while Rn-222 activity in bottom waters is affected by submarine groundwater discharge. Eddy diffusivity and advection velocities were obtained using a 1D steady-state Rn-222 diffusion-advection model, demonstrating the importance of eddy diffusion tracing in interpreting water mixing processes and offshore nutrient and carbon transport.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Jingshu Wang, Jinhui Jeanne Huang, Iseult Lynch
Summary: This study revealed the characteristics of bacterial communities on road deposited sediments (RDS) in urban and suburban areas through seasonal and daily scales. It was found that the season showed a higher association with bacterial community diversity than land use and particle size in urban areas. The short-term study period showed a substantial increase in bacterial community diversity, with the dominant bacteria variation in suburbs being fit by a quadratic function.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Pingping Hong, Jingen Xiao, Hongtao Liu, Zhiguang Niu, Yini Ma, Qing Wang, Dianjun Zhang, Yongzheng Ma
Summary: Microplastics pose significant risks to marine ecosystems and human health as emerging contaminants. The development of rapid monitoring techniques for marine microplastics is increasingly important for efficient data acquisition. In this study, a inversion model based on remote sensing data and measured data was established to predict microplastics pollution in the Bohai Sea. The abundance and spatio-temporal distribution of microplastics in the Bohai Sea in 2022 were analyzed using the selected approach, and it was found that their abundance varied significantly across seasons and regions. This study highlights the great potential of satellite remote sensing technology in monitoring marine microplastics.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Ilaria Cazzaniga, Giuseppe Zibordi, Frederic Melin
Summary: This study investigates the spectral features of remote sensing reflectance in marine waters during coccolithophore blooms by analyzing radiometric data from Ocean Color sites in the Western Black Sea. The results confirm an increase in reflectance in the blue-green spectral region during coccolithophore blooms, as well as a shift towards the blue as the blooms decline and coccoliths accumulate at the surface. It also highlights the challenges in determining bloom states in optically complex waters and compares satellite data with AERONET-OC radiometric data to show agreements in extreme conditions with significant concentrations of coccoliths.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Environmental Sciences
Zhi-Xian Tian, Yong Zhang, Xi Mei, Wei Xiong, Bei-Bei Mi, Zhong-Lei Wang
Summary: The epicontinental seas to the east of China, particularly the Bohai Strait, have been heavily impacted by heavy metal pollution. The investigation of the surface sediments in the northern Bohai Strait revealed high concentrations of heavy metal elements, especially As, Cd, and Pb, posing a significant ecological risk. The study also found that the accumulation of Hg, Cr, and Zn was associated with the deposition of organic matter, and the pollutants mainly originated from the eastern parts of the North Yellow Sea.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2022)
Article
Environmental Sciences
Baohua Zhang, Junting Guo, Zengrui Rong, Xianqing Lv
Summary: Water color is a crucial parameter for assessing water quality and ecological health in coastal waters. This study utilized multi-sensor satellite datasets to analyze the spatiotemporal variations of water color in the Bohai and Yellow Seas. The findings reveal decreasing trends in water color from nearshore to offshore regions, with significant influence from wind, sea surface temperature, and ocean stratification. The study also discusses the factors contributing to interannual variations in water color, such as surface winds, temperature, river outflow, rainfall, and anthropogenic activities. Overall, this study provides a comprehensive evaluation of water color variations and their underlying mechanisms in the Bohai and Yellow Seas.
Article
Geosciences, Multidisciplinary
Xiao Wu, Houjie Wang, Naishuang Bi, Jeffrey A. Nittrouer, Jingping Xu, Shuai Cong, Brandee Carlson, Taian Lu, Zhaoying Li
Article
Oceanography
Ping Yuan, Houjie Wang, Xiao Wu, Naishuang Bi
JOURNAL OF OCEAN UNIVERSITY OF CHINA
(2020)
Article
Environmental Sciences
Xiao Wu, Houjie Wang, Naishuang Bi, Jingping Xu, Jeffrey A. Nittrouer, Zuosheng Yang, Taian Lu, Peihua Li
Summary: This study highlights the impacts of the Water-Sediment Regulation Scheme (WSRS) on the lower Yellow River system, showing that artificial floods have significantly altered the volume and grain size patterns of transported sediment. The changes have led to high sediment loads over a shorter time frame and coarsening of the river channel, causing a shift from recession to progradation in the Yellow River delta and rapid burial of terrestrial organic carbon and pollutants.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Quantao Zhu, Peng Li, Zhenhong Li, Sixun Pu, Xiao Wu, Naishuang Bi, Houjie Wang
Summary: This study combined optical and Synthetic Aperture Radar (SAR) satellite remote sensing images to analyze the spatiotemporal changes of the Yellow River Delta coastline from 1980 to 2020, demonstrating the significant impact of sediment discharge on coastline changes.
Article
Oceanography
Xiting Liu, Mingyu Zhang, Anchun Li, Daidu Fan, Jiang Dong, Chaoqun Jiao, Xin Chang, Yu Gu, Kaidi Zhang, Houjie Wang
Summary: This study investigates the preservation of carbon and sulfur in estuary and shelf sediments, finding that the C/S ratio can effectively differentiate between freshwater and marine environments. It suggests a new mechanism for the influence of physical factors on carbon and sulfur preservation, providing valuable insights into sediment diagenesis related to the global biogeochemical cycle.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Naishuang Bi, Houjie Wang, Xiao Wu, Yoshiki Saito, Congliang Xu, Zuosheng Yang
Summary: The modern Huanghe Delta used to be the most rapid land-building delta in the world, but its evolution has been affected by a decrease in sediment load from the Huanghe in recent decades. This study used bathymetric data and Landsat imagery to study the spatiotemporal evolution of the delta, revealing distinct patterns in the evolution of the active lobe and the abandoned lobe. The evolution of the active lobe was influenced by sediment load, hydrodynamic-morphologic interactions, and grain size of the sediment, while changes in sediment dispersals dominated the evolution of the abandoned lobe.
Article
Geosciences, Multidisciplinary
Shuai Cong, Xiao Wu, Jianzhong Ge, Naishuang Bi, Yunhai Li, Jian Lu, Houjie Wang
Summary: The study using a high-resolution model revealed that sediment dynamics on the East China Sea inner shelf showed significant asymmetry during the passage of Typhoon Chan-hom, leading to sediment resuspension and transport towards the southwest direction. The research also found that the typhoon disrupted the coastal upwelling in summer, enhancing cross-shelf sediment transport.
Article
Environmental Sciences
Jingbo Chen, Ming Liu, Naishuang Bi, Yadi Yang, Xiao Wu, Dejiang Fan, Houjie Wang
Summary: The study found that the transport of heavy metals is significantly controlled by hydrological processes, mainly in particulate form, closely related to particle size and suspended sediment concentration. Heavy metals mainly originate from the upper and middle reaches of the Yellow River, but are also influenced by human emissions in downstream areas. Downstream areas play an important role as a sink in the process of heavy metal input into the sea, acting as a significant buffer and filter.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Canran Tu, Peng Li, Zhenhong Li, Houjie Wang, Shuowen Yin, Dahui Li, Quantao Zhu, Maoxiang Chang, Jie Liu, Guoyang Wang
Summary: This study proposed a synergistic classification method combining hyperspectral and radar imagery for wetland mapping, achieving an overall accuracy of 97% and demonstrating the effectiveness of this fusion approach. The synergy of polarimetric SAR and hyperspectral imagery enables high-resolution wetland classification, offering potential for providing accurate and temporally detailed wetland classification results in different regions.
Article
Environmental Sciences
Jie Liu, Peng Li, Canran Tu, Houjie Wang, Zhiwei Zhou, Zhixuan Feng, Fang Shen, Zhenhong Li
Summary: This study investigates the spatiotemporal coherence change in the coastal wetlands of the Yellow River Delta using synthetic aperture radar (SAR) images. The results show that the temporal baseline has a significant impact on coherence, and a synergetic classification method combining SAR coherence, backscatter intensity, and optical images outperforms single-source data or other algorithms.
Article
Environmental Sciences
Maoxiang Chang, Peng Li, Zhenhong Li, Houjie Wang
Summary: The article introduces a new method using Sentinel-2 imagery and Google Earth Engine to generate a tidal flat map for the Bohai and Yellow Seas. The map covers a time span from October 1, 2020, to October 31, 2021, with an overall accuracy of 94.55% and a total area of 546,360.2 hectares. This updated tidal flat map can facilitate policy-making and provide insights into the responses of tidal flats to natural and human disturbance.
Article
Environmental Sciences
Maoxiang Chang, Peng Li, Yue Sun, Houjie Wang, Zhenhong Li
Summary: This study proposes a method for extracting TMZ in the Yellow River estuary using time series remote sensing images and GEE, and systematically investigates the distribution, variation, and regulation mechanisms of TMZ. The results show that there are clear seasonal and decadal variations in TMZ in the Yellow River estuary, which are influenced by morphology, currents, wind speeds, and seawater stratification.
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
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)
Article
Engineering, Electrical & Electronic
Peng Li, Zhenhong Li, Keren Dai, Yasir Al-Husseinawi, Wanpeng Feng, Houjie Wang
Summary: The study presents an iterative method to generate high-resolution TanDEM-X DEMs and assesses vertical accuracy in China, showing remarkable elevation quality in coastal areas but weaker accuracies in steep mountainous areas. The TanDEM-X DEM performs better than other global DEMs overall, with low topographic error contribution in mountainous and coastal areas.
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2021)
