Article
Environmental Sciences
Lingjuan Cao, Dianjun Zhang, Xuefeng Zhang, Quan Guo
Summary: This paper proposes a method for oceanic mesoscale eddy detection and identification based on the YOLOF model. By using deep learning and ocean data, the accuracy and speed of eddy recognition are improved, promoting the development in this field.
Article
Geosciences, Multidisciplinary
Romain Torres, Robin Waldman, Julian Mak, Roland Seferian
Summary: This study uses a simplified model to indirectly estimate the dissipation of eddy kinetic energy (EKE) and finds intensified dissipation near strong ocean currents. The results provide new insights for the global reconstruction of EKE dissipation in the world ocean.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Mengrong Ding, Hailong Liu, Pengfei Lin, Aixue Hu, Yao Meng, Yiwen Li, Kexiu Liu
Summary: The performance of eddy-resolving global ocean-sea ice models in simulating mesoscale eddies is evaluated, revealing an overestimation of energy intensity in eddy-rich regions and an underestimation of eddy kinetic energy in eddy-poor regions.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Zhanhong Ma, Zheliang Zhang, Jianfang Fei, Huizan Wang
Summary: This study investigates the impact of tropical cyclones on the structural characteristics of oceanic eddies in the western North Pacific. The results show that the strength and size of both warm-core and cold-core eddies are modulated by the passage of tropical cyclones, with changes in amplitude, circulation speed, and mixed-layer depth. Additionally, tropical cyclones can prolong the lifetimes of eddies and impact air-sea energy exchange through altering sea surface temperature response.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Xinyu Zhang, Hua Zheng, Xiao-Hua Zhu, Ruixiang Zhao, Cong Xiao, Min Wang, Juntian Chen
Summary: The study investigates a supercharged cold eddy with strong temperature anomaly in the Kuroshio Extension region. The three-dimensional structure of the eddy is continuously observed for 83 days, showing stable characteristics in terms of radius, depth and speed. The analysis reveals that the eddy energy mainly originates from the Kuroshio and is enhanced by baroclinic and barotropic conversion.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Qiang Ren, Yansong Liu, Ran Wang, Feng Nan, Jianfeng Wang, Xinyuan Diao, Zifei Chen, Fei Yu, Chuangzheng Zhang, Ruixiang Zhao, Hua Zheng, Xiao-Hua Zhu
Summary: Based on the data analysis of 39 CPIESs deployed east of Taiwan in 2018-2019, this study reveals the three-dimensional structure of mesoscale eddies and their interaction with Kuroshio. The results show that the anticyclonic interaction deepens the pycnocline and strengthens the Kuroshio, while the cyclonic interaction shallows the pycnocline and weakens the Kuroshio. This research provides the basis for further investigation of energy exchange during eddy-Kuroshio interactions.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Zhiwei You, Lingxiao Liu, Brandon J. Bethel, Changming Dong
Summary: This study compares different global ocean mesoscale eddy datasets and evaluates their advantages and disadvantages in four regions with strong eddy activity. The results show that although there are differences in the total number of eddies detected in each dataset, the distribution of eddy radii tends to be right-skewed towards larger eddies, and there are more short-lived eddies than long-lived ones.
Article
Oceanography
Wen Chen, Yongchui Zhang, Yuyao Liu, Lina Ma, Haodi Wang, Kaijun Ren, Shiyao Chen
Summary: This study establishes a region-dependent parametric model for the three-dimensional structure of eddy-induced sound speed anomalies, which can be quickly reconstructed based on the intensity and radius of the eddy. The results demonstrate that this parametric model can advance the research on eddy-acoustic effects in the case of observation data shortages.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Qian Shi, Guihua Wang
Summary: Both observations and an idealized model have shown that the path of a western boundary current, like the Kuroshio, can be perturbed by the impingement of an ocean eddy. The subsequent disruption occurs primarily near the interaction region and propagates downstream, forming a dissipating wavelike fluctuation. The spatial-temporal evolution of Kuroshio axis shift by impinging eddy is determined by two nondimensional factors: the ratio of eddy strength to the Kuroshio strength; and the ratio of horizontal shearing strength in the background to that in the current.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Meteorology & Atmospheric Sciences
Shiwei Sun, Bowen Zhou, Ming Xue, Kefeng Zhu
Summary: In numerical simulations of deep convection at kilometer-scale horizontal resolutions, it is shown that in-cloud subgrid-scale turbulence plays a vital role in the transport of heat, moisture, and other scalars. By adapting a scale-similarity LES closure to kilometer-scale simulations, improvements are made in representing turbulent fluxes in deep convective storms.
JOURNAL OF THE ATMOSPHERIC SCIENCES
(2021)
Article
Geography, Physical
Guiyan Han, Fenglin Tian, Chunyong Ma, Ge Chen
Summary: The study of the average shape and orientation of eddies in the South China Sea reveals that the elliptical shape of eddies influences oceanic variables differently from global eddies, providing a new approach to explore the impact of air-sea interactions on oceanic eddies.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2021)
Article
Multidisciplinary Sciences
Mukund Gupta, Richard G. Williams, Jonathan M. Lauderdale, Oliver Jahn, Christopher Hill, Stephanie Dutkiewicz, Michael J. Follows
Summary: The expansive gyres of the subtropical ocean play a significant role in global organic carbon export. This study examines the nutrient pathways that replenish the subeuphotic layers in the gyre interior. Using a simulation model, the researchers find that mesoscale eddies flux nutrients from the shallow flanks of the gyre into the recirculating interior, contributing to the replenishment of subeuphotic layers along density surfaces. This nutrient relay sustains the productivity of the subtropical gyre.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Guangchuang Zhang, Ru Chen, Laifang Li, Hao Wei, Shantong Sun
Summary: Mixing induced by oceanic mesoscale eddies can affect tracer distributions in the ocean. We quantified the trend in surface eddy diffusivity in the global ocean using satellite altimetry data. The particle-based eddy diffusivity increases by 284.1 m(2) s(-1) per decade during 1994-2017, or 3.7% per decade relative to its climatological mean value.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Pierre Damien, Daniele Bianchi, Faycal Kessouri, James C. McWilliams
Summary: Eddies play a crucial role in shaping ocean dynamics and modulating biogeochemical transformation rates. The non-linear nature of nutrient uptake by phytoplankton and the compensation between mesoscale and submesoscale eddies significantly impact primary production and nutrient transport in the California Current System.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Marine
Haitong Wang, Yunxia Guo, Yuan Kong, Yong Fang
Summary: A data-driven machine learning model, TMENN, is proposed to forecast the spatiotemporal variation of mesoscale eddies in the Kuroshio Extension. By decomposing sea surface height data and selecting principal components as predictors, the model can reliably forecast the evolution of eddies and accurately capture the mesoscale eddy processes.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Review
Meteorology & Atmospheric Sciences
Wei Zhang, Yu Sun, Yapeng Wu, Junyu Dong, Xiaojiang Song, Zhiyi Gao, Renbo Pang, Boyu Guoan
Summary: This study employed a spatiotemporal deep-learning method to correct biases in numerical ocean wave forecasts. By using a correction model driven by both wave and wind fields and a novel pixel-switch loss function, the corrected results performed well in different seasons and improved the accuracy of the original forecasts.
