Article
Oceanography
Shoichiro Kido, Masami Nonaka, Youichi Tanimoto
Summary: This study examines the salinity variations in the Kuroshio-Oyashio confluence region and evaluates their potential impacts on sea surface temperature. The research finds significant covariations between temperature and salinity in the region, which are closely related to the dynamical stability of the Kuroshio Extension. Salinity anomalies are shown to significantly affect local density and alter the strength of vertical mixing, leading to differences in sea surface temperature.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Gaige Hunter Kerr, Darryn W. Waugh, Scot M. Miller
Summary: This study investigates the impact of the upper-level jet stream on surface-level trace gas variability using idealized tracers within a chemical transport model. Results show a strong correlation between the position of the jet stream and the daily variability of the tracers, with variations in the north-south wind and latitudinal tracer gradient playing key roles in predicting the phase relationship between the jet stream and tracers. These findings provide valuable insight into understanding changes in trace gas variability under potential shifts in the jet stream's position or major emission sources in the future.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Review
Oceanography
Yu Long, Xinyu Guo, Xiao-Hua Zhu, Zhiyuan Li
Summary: The study examines the nutrient streams in the North Pacific by analyzing the results of the inverse calculation of the WOCE-revisit cruise data. The Kuroshio, Alaskan Stream, and Oyashio are found to be the main drivers of nutrient transport in the basin. The nutrient concentration increases or decreases from upstream to downstream regions due to lateral water exchange and biogeochemical processes. Vertical nitrate transport is mainly achieved through ventilation processes of subduction and induction.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Kristin J. Painter, Robert B. Brua, Geoff Koehler, John Spoelstra, Adam G. Yates
Summary: The study found that intensive agriculture and growing human populations contribute to nitrogen sources in streams, with seasonal variations in nitrogen delivery. Nitrogen sources from fertilizers and animal waste were more prominent during spring and summer, while human and livestock waste were the dominant contributors to algae. The study also highlighted the importance of managing nitrogen sources to control downstream nitrogen transfer and protect stream function.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yanzhen Du, Ming Feng, Zhenhua Xu, Baoshu Yin, Alistair J. Hobday
Summary: This study explores the evolution and driving factors of summer marine heatwaves (MHWs) in the Kuroshio-Oyashio Extension (KOE) region of the North Pacific. The results indicate that MHWs in 1999, 2008, 2012, and 2016 were primarily driven by air-sea heat flux anomalies, while MHWs in 2018, 2020, and 2021 were mainly influenced by the ocean memory of winter warming. The northward shift of the Kuroshio Extension axis, northward intrusion of anticyclonic eddies, and decadal warming trend may contribute to the occurrence of these summer MHWs.
Article
Chemistry, Multidisciplinary
Jiaqian Li, Xiaofeng Zhou, Ran Tao, Huanxi Zheng, Zuankai Wang
Summary: This study reports a unique phenomenon where water liquid deposited on a specially designed topological surface can flow from the low-temperature region to the high-temperature region in a spontaneous, long-range, and unidirectional manner, primarily due to a strong topological effect. The findings provide important insights for developing next-generation cooling devices.
Article
Meteorology & Atmospheric Sciences
Yu Geng, Hong-Li Ren, Qiang Wang
Summary: This study investigates the impact of bimodal states of Kuroshio Extension on seasonal mixed-layer temperature anomaly (MLTA) in the Kuroshio-Oyashio Confluence Region. The results reveal that the bimodal states of Kuroshio Extension have a modulation role in the seasonal variability of MLTA in the region.
Article
Meteorology & Atmospheric Sciences
Zhangqun Li, Ziniu Xiao, Jian Ling
Summary: According to the study, the warm thermal conditions over the Tibetan Plateau in spring 2022 led to abnormal movement of monsoons and subsequently affected the precipitation distribution pattern in the southwest and southeast regions. This study suggests that the spring thermal conditions over the Tibetan Plateau are of significant value in predicting extreme summer precipitation in these regions months in advance.
ATMOSPHERIC RESEARCH
(2023)
Article
Environmental Sciences
Toru Miyama, Shoshiro Minobe, Hanako Goto
Summary: The sea surface temperature in the Oyashio region experienced a sharp increase in boreal summer starting from 2010, with high summertime temperatures persisting until 2016. Observations and ocean reanalysis data indicate that this marine heatwave affected not only the surface, but also depths down to 200m, accompanied by a rise in summer salinity. The rise in temperature and salinity suggest a strengthening influence of the Kuroshio water in the region.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Biology
Sylvie Estrela, Alicia Sanchez-Gorostiaga, Jean C. C. Vila, Alvaro Sanchez
Summary: The study found that while the family-level community composition can generally be predicted using the null, naturally additive model, there are systematic deviations from the additive predictions that reflect generic patterns of nutrient dominance. Pairs of more similar nutrients tend to be more additive than pairs of dissimilar nutrients, and sugar-acid communities are generally more similar to sugar communities than acid communities, possibly due to family-level asymmetries in nutrient benefits. Overall, the study suggests that regularities in how nutrients interact may help predict community responses to dietary changes.
Article
Environmental Sciences
Franklin Torres-Bejarano, Jesus Garcia-Gallego, Javier Salcedo-Salgado
Summary: This research analyzes the trophic state of the Betanci reservoir in Colombia through nutrient transport numerical modeling. The results show that variations in total nitrogen concentration and increased inflows have short-term consequences on the reservoir's trophic state, with a 100% increase in total nitrogen concentration causing it to shift from a light eutrophic to a hypereutrophic state. The findings of this study provide a starting point for integrated water resources management in reservoirs.
INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH
(2023)
Article
Multidisciplinary Sciences
Chen-Tung Arthur Chen, Ting-Hsuan Huang, Chi-Hsuan Wu, Haiyan Yang, Xinyu Guo
Summary: The Kuroshio, also known as the Black Stream, is the most significant current in the Pacific Ocean. It forms a nutrient stream below the euphotic layer, supporting high productivity and fisheries in the East China Sea continental shelf and the Kuroshio Extension. Nutrient transports northward have been increasing since 2015 due to a rise in subsurface water transport, enhancing the Kuroshio's productivity.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Yaoyao Wang, Rong Bi, Jing Zhang, Jiawei Gao, Shigenobu Takeda, Yoshiko Kondo, Fajin Chen, Gui'e Jin, Julian P. Sachs, Meixun Zhao
Summary: This study reports the spatial distribution of phytoplankton biomass and community structure in the surface and deep chlorophyll maximum layers of the Northwest Pacific Ocean. By using lipid biomarkers, the researchers found variations in biomass and phytoplankton composition in different nutrient regimes, with diatoms dominating in the deep chlorophyll maximum layer, enhancing carbon sequestration.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
C. Howley, J. Shellberg, J. Olley, A. Brooks, J. Spencer, M. Burford
Summary: The study found that in the Normanby Basin in northern Australia, suspended sediment concentrations and yields were highest in the upper catchment areas, while mid- and lower catchment rivers and floodplains were a sink for sediments and nutrients, trapping around 75% of suspended sediments during events.
MARINE POLLUTION BULLETIN
(2021)
Article
Oceanography
N. Lehmann, D. C. Reed, C. Buchwald, D. Lavoie, P. A. Yeats, Z. -P. Mei, Z. Wang, C. L. Johnson
Summary: Research reveals that subsurface nutrient availability on the Scotian Shelf is modulated by upstream waters and exhibits long-term fluctuations. Data from 1975 to 2020 show changes in nutrient availability across different decades.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Review
Oceanography
Yu Long, Xinyu Guo, Xiao-Hua Zhu, Zhiyuan Li
Summary: The study examines the nutrient streams in the North Pacific by analyzing the results of the inverse calculation of the WOCE-revisit cruise data. The Kuroshio, Alaskan Stream, and Oyashio are found to be the main drivers of nutrient transport in the basin. The nutrient concentration increases or decreases from upstream to downstream regions due to lateral water exchange and biogeochemical processes. Vertical nitrate transport is mainly achieved through ventilation processes of subduction and induction.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Akihiko Morimoto, Menghong Dong, Mahiro Kameda, Taiga Shibakawa, Makiko Hirai, Kouhei Takejiri, Xinyu Guo, Hidetaka Takeoka
Summary: In early July 2018, heavy rain near the Seto Inland Sea caused a decrease in water temperature on the eastern coast of the Bungo Channel. The heavy rain intensified vertical mixing of cold water from the Pacific Ocean in the bottom layer, leading to increased gravitational circulation and inflow from the Pacific Ocean in the bottom layer, as well as an increase in dissolved inorganic nitrogen flux to the Bungo Channel.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Jingyuan Xi, Yuntao Wang, Zhixuan Feng, Yang Liu, Xinyu Guo
Summary: Seventeen years of satellite observational data is used to analyze the variability in sea surface temperature (SST) fronts in the northwestern Pacific Ocean. The study found that the frontal intensity has less background noise and better represents the variability in frontal patterns compared to the SST gradient and frontal probability. The seasonal variability in frontal intensity is prominent and varies spatially. The migration of fronts is associated with the seasonal movement of the North Pacific subtropical gyre. The study also revealed that seasonal cycles alone cannot capture the full picture of frontal features, as eddy-induced intraseasonal variability and basin-scale signal-induced interannual variability can modulate frontal dynamics.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Environmental
Min Yang, Xinyu Guo, Miho Ishizu, Yasumasa Miyazawa
Summary: Accurate calculation of air-sea fluxes for PCBs is essential for understanding their atmospheric transport. This study developed a model to evaluate the fluxes and investigate the impacts of ocean currents on the fluxes in the northwestern Pacific Ocean. The results reveal a fine structure in the fluxes that is influenced by the Kuroshio current, with intense downward and upward fluxes found in specific regions. The study emphasizes the importance of considering strong western boundary currents in future atmospheric transport models for PCBs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Review
Oceanography
Anzhou Cao, Zheng Guo, Shuya Wang, Xinyu Guo, Jinbao Song
Summary: This study examines the incoherence of internal tides radiated from the Luzon Strait under the influence of looping and leaping Kuroshio. The looping Kuroshio causes stronger incoherence of the tides compared to the leaping Kuroshio, due to a larger variation of eigenspeed. Low-frequency background currents play a more important role than stratification in changing the eigenspeed.
PROGRESS IN OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Xiaokun Ding, Jie Shi, Xinyu Guo, Huiwang Gao, Sumei Liu, Wei Guo
Summary: There is growing concern about the impact of human activities on the coastal nutrient cycle, but the interannual variations in response to anthropogenic nutrient input have been rarely studied. This study used a hydrodynamic-ecological model to analyze the interannual variations in the nutrient cycle in the central Bohai Sea. The results showed increasing trends in nitrogen levels, but no noticeable interannual variations in phosphorus levels. Atmospheric nitrogen deposition played a significant role in the nitrogen cycle, and sedimentation processes were responsible for removing most of the anthropogenic nitrogen inputs.
Article
Oceanography
Zheng Guo, Shuya Wang, Anzhou Cao, Jieshuo Xie, Jinbao Song, Xinyu Guo
Summary: This study examines the role of anticyclonic and cyclonic eddies in modulating the M2 internal tides in the northern South China Sea. The results show that the anticyclonic eddy causes northward refraction of the M2 internal tides, while the cyclonic eddy causes southward refraction. The most significant impacts occur on the continental slope in the northern South China Sea.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Oceanography
Su Mei Liu, Wen Liang, Xinyu Guo, Nian Wu, Wuchang Zhang, Xiujuan Shan, Hua-De Zhao, Juying Wang, Jin Huang
Summary: Chinese continental margins are undergoing significant environmental changes due to anthropogenic activities and climate change. This study focuses on the Bohai as a case study and examines the impacts of multiple stressors on ecosystems and social interactions. The Bohai ecosystem has been extensively modified, with changes in the coastline, nutrient concentrations, and fishery resources. It is important to implement strict policies for coastline protection and pollution control, as well as measures like fishing bans and stock enhancement to mitigate these impacts.
Review
Oceanography
Shuya Wang, Qun Li, Anzhou Cao, Xinyu Guo
Summary: This study investigates seven burst events of near-inertial waves (NIWs) based on moored observations from the Beaufort Gyre Exploration Project. The NIW events are divided into two groups. Four events in group I are dominated by downgoing components associated with near-inertial currents. The other three events in group II have comparable downgoing and upgoing components and may be related to eddy events.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Environmental Sciences
Junying Zhu, Quanyi Zhou, Qianqing Zhou, Xinxing Geng, Jie Shi, Xinyu Guo, Yang Yu, Ziwei Yang, Renfu Fan
Summary: Coastal upwelling around Hainan Island has a significant impact on the physical environment, ecological environment, and fishery resources of the surrounding waters. The study analyzed the interannual variations of sea surface temperature (SST) around Hainan Island based on satellite observations from 2003 to 2021, focusing on the upwelling regions in Qiongdong and Qiongxi. The results showed warming trends in the upwelling regions, and the SST variations were influenced by factors such as wind stress curl, stratification, and bottom cold water in the Gulf of Tonkin.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Junyong Zheng, Xinyu Guo, Haiyan Yang, Kailun Du, Xinyan Mao, Wensheng Jiang, Takuya Sagawa, Yasumasa Miyazawa, Sergey M. Varlamov, Ayako Abe-Ouchi, Wing-Le Chan
Summary: By using a simple box model, researchers reconstructed the sea surface salinity in the Japan Sea over the past 35 kyr and found that the sea experienced a low salinity event during the Last Glacial Maximum, with the minimum value occurring at 20 kyr BP. It was concluded that both the inflow transport and the sea surface freshwater flux determine the exact value and timing of minimum salinity.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Oceanography
Lixin Wang, Zhenhua Xu, Xiang Gong, Peiwen Zhang, Zhanjiu Hao, Jia You, Xianzhi Zhao, Xinyu Guo
Summary: In this study, a deep neural network (DNN) model was developed to estimate nitrate concentrations in the upper northwestern Pacific Ocean (NPO). By separately training the model for subtropical and tropical regions, the prediction skill was improved. The results indicate that the DNN model performs well in depicting both spatial and seasonal variability of nitrate concentrations.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Oceanography
Yu-Lin K. Chang, Sergey M. Varlamov, Xinyu Guo, Toru Miyama, Yasumasa Miyazawa
Summary: In July 2020, a stationary atmospheric front over Japan resulted in persistent heavy rainfall, causing extreme river discharge, floods, and landslides. Existing models failed to accurately represent the river discharge, but new experiments using real-time river discharge information improved the model simulation. The inclusion of real-time river discharge had a significant impact on coastal salinity distribution, offshore currents, and cross-shelf exchange.
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
Oceanography
Anzhou Cao, Shuya Wang, Akihiko Morimoto, Tetsutaro Takikawa, Xinyu Guo
Summary: Recent studies have shown that typhoon-induced near-inertial waves (NIWs) have different modal content in shallow and deep regions, but the underlying mechanisms are not fully understood. Using a three-dimensional numerical model, this study simulated the NIWs induced by two typhoons in the East China Sea and its adjacent deep waters. The results revealed that in shallow regions, the NIWs were mainly dominated by mode-1, while in deep regions, higher modes (mode-2 to mode-5) dominated. Different mechanisms, including higher-mode wind forcing and two-layer-structure stratification, accounted for the different modal content.
CONTINENTAL SHELF RESEARCH
(2023)
