Article
Ecology
Shuangling Chen, Mark L. Wells, Rui Xin Huang, Huijie Xue, Jingyuan Xi, Fei Chai
Summary: Subduction associated with mesoscale eddies is identified as a significant process for exporting carbon and oxygen to the mesopelagic zone. Episodic subduction patches were found in the Kuroshio Extension region, mainly occurring between March and August. These events are estimated to significantly increase oxygen ventilation and carbon removal in the region, with potential for future growth due to climate-driven changes in eddy kinetic energies.
Article
Environmental Sciences
Ran Wang, Qiang Ren, Feng Nan, Fei Yu
Summary: North Pacific subtropical mode waters (STMWs), characterized by low potential vorticity (PV), play a significant role in climate change. The movement of STMWs into the South China Sea (SCS) is still unclear, but low PV signals originating from STMWs have been observed during certain periods.
FRONTIERS IN MARINE SCIENCE
(2023)
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
Meteorology & Atmospheric Sciences
Sieu-Cuong San, Yu-heng Tseng
Summary: Analysis of observational data shows the existence of a decadal subsurface spiciness mode in the North Pacific, involving ocean-atmosphere coupling. The Aleutian Low drives a pattern of positive and negative spiciness anomalies, which propagate equatorward along a deflected route. Equatorial sea surface temperature variability is strongly connected to extratropical spiciness anomalies, potentially leading to a decadal climate oscillation in the North Pacific. The dominant physical processes responsible for subsurface spiciness variability differ between the eastern midlatitude and subtropical North Pacific.
Article
Environmental Sciences
Mengxuan An, Jie Liu, Jishan Liu, Wenjin Sun, Jingsong Yang, Wei Tan, Yu Liu, Kenny T. C. Lim Kam Sian, Jinlin Ji, Changming Dong
Summary: This study divides the mesoscale eddies in the North Pacific Subtropical Countercurrent region into four types and finds that abnormal eddy phenomenon mainly occurs in the upper layer of the ocean. The proportion, average radius, amplitude, and eccentricity of each type of eddy are different. In addition, the movement direction and depth of the eddies are influenced by different factors. This research deepens our understanding of the spatial distribution characteristics of mesoscale eddies in the STCC region.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Wenjin Sun, Mengxuan An, Jishan Liu, Jie Liu, Jingsong Yang, Wei Tan, Kenny T. C. Lim Kam Sian, Jinlin Ji, Yu Liu, Changming Dong
Summary: The North Pacific Subtropical Countercurrent area experiences high mesoscale eddy activities. The eddies can be categorized into normal (CCE and AWE) and abnormal (CWE and ACE) based on temperature anomaly and rotation direction. There is a seasonal variation in the occurrence and properties of these eddies.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
G. Song, R. C. Ren
Summary: We have identified a remote linkage between Central Pacific ENSO and the occurrence of Sub-IODs in winter-to-spring. Certain Sub-IOD events develop independently during this period and are usually accompanied by a CP ENSO event in the winter that peaks in early spring. This CP ENSO event, with a more westward-located sea surface temperature anomaly, contributes to the development of an anomalous descending or ascending branch of the Walker circulation over the Indo-Pacific region and triggers positive or negative Sub-IOD events in the subsequent spring.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Jinfeng Ma, Qian Yang, Hailong Liu, Pengfei Lin, Juan Liu
Summary: This study investigates the effects of ocean chlorophyll on the subduction rate of subtropical and central mode waters in the Pacific Ocean. The results show that ocean chlorophyll increases the subduction rate, mainly due to the increased gradient of mixed layer depth in the chlorophyll experiment.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Lei Chen, Changming Dong, Guihua Wang
Summary: The North Pacific Gyre Oscillation (NPGO), Pacific Decadal Oscillation, and El Nino-Southern Oscillation are climate fluctuations in the Pacific. Mesoscale eddies dominate the ocean kinetic energy spectrum. Analysis of altimetry data reveals a close linkage between these climate fluctuations and eddy propagation speed. The propagation speeds of cyclonic and anticyclonic eddies exhibit differences between the positive and negative phases, modulated by NPGO.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Meteorology & Atmospheric Sciences
Weikang Zhan, Qingyou He, Ying Zhang, Haigang Zhan
Summary: By analyzing 27 years of eddy and tropical cyclone data, a study found that mesoscale ocean eddies significantly affect the formation of tropical cyclones. During the off-season months in the western North Pacific, there were more tropical cyclones generated over anticyclone eddies compared to cyclone eddies, and they were located further north. The study also showed that there is a higher probability of tropical cyclone genesis over anticyclone eddies, especially under cooler oceanic conditions. These findings suggest the importance of considering the impacts of ocean eddies in air-sea models for better forecasting of regional tropical cyclone activities.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Multidisciplinary Sciences
Cong Gao, Lei Zhou, Chunzai Wang, I. -I. Lin, Raghu Murtugudde
Summary: Research shows that changes in subsurface heat content in the tropical central-north Pacific counteract the favorable sea surface temperatures for tropical cyclone genesis. This is critical for understanding the dynamics of tropical cyclone formation.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Jiang Zhou, Guidi Zhou, Hailong Liu, Zhuhua Li, Xuhua Cheng
Summary: The study investigates the thermodynamic anomalies induced by oceanic mesoscale eddies in the North Pacific, finding that most eddies have small amplitudes and are associated with small thermodynamic anomalies. Anticyclonic and cyclonic eddies exhibit different characteristics in terms of temperature and heat content. Eddies are responsible for a significant portion of variability in sea surface height, isothermal layer depth, and upper ocean heat content in the North Pacific.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Ran Wang, Feng Nan, Fei Yu, Bin Wang
Summary: This study reveals that North Pacific subtropical mode water can reach and impact the Kuroshio mainstream east of Taiwan. The presence of subsurface anticyclonic eddies leads to changes in the northward transport and position of the Kuroshio.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Limnology
Kuanbo Zhou, Claudia R. Benitez-Nelson, Jie Huang, Peng Xiu, Zhenyu Sun, Minhan Dai
Summary: Mesoscale eddies in the North Pacific Subtropical Gyre were found to enhance nutrient injection into the photic zone, affecting the magnitude and composition of particle export to depth. Biogenic silica fluxes were significantly higher at both the cores and edges of cyclonic eddies, with peak values occurring during the mature stage. During the bloom season, all elemental fluxes were reduced in cyclonic eddies compared to non-eddy references.
LIMNOLOGY AND OCEANOGRAPHY
(2021)
Article
Engineering, Marine
Jiaqi Liu, Shengchun Piao, Lijia Gong, Minghui Zhang, Yongchao Guo, Shizhao Zhang
Summary: A mesoscale eddy is detected and tracked in the western North Pacific region, with variations in intensity observed within its lifecycle. Satellite images show the oceanic eddy moving westward until it disappears. Studying the oceanographic and acoustic characteristics of the eddy, researchers calculated the acoustic energy distribution of different intensity eddies. Sound propagation through cyclonic and anticyclonic eddies were compared to background hydrography, with changes in coupling coefficient of normal modes noted.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Oceanography
Yuma Kawakami, Shusaku Sugimoto, Toshio Suga
JOURNAL OF OCEANOGRAPHY
(2016)
Article
Oceanography
Eitarou Oka, Shota Katsura, Hiroyuki Inoue, Atsushi Kojima, Moeko Kitamoto, Toshiya Nakano, Toshio Suga
JOURNAL OF OCEANOGRAPHY
(2017)
Article
Environmental Sciences
Shusaku Sugimoto, Kimio Hanawa, Tomowo Watanabe, Toshio Suga, Shang-Ping Xie
NATURE CLIMATE CHANGE
(2017)
Review
Oceanography
Eitarou Oka, Masao Ishii, Toshiya Nakano, Toshio Suga, Shinya Kouketsu, Masatoshi Miyamoto, Hideyuki Nakano, Bo Qiu, Shusaku Sugimoto, Yusuke Takatani
JOURNAL OF OCEANOGRAPHY
(2018)
Article
Meteorology & Atmospheric Sciences
Ryohei Yamaguchi, Toshio Suga, Kelvin J. Richards, Bo Qiu
Article
Oceanography
Ryohei Yamaguchi, Toshio Suga
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2019)
Article
Oceanography
Yoshimi Kawai, Shigeki Hosoda, Kazuyuki Uehara, Toshio Suga
Summary: This study evaluated the heat and salinity transport between the mixed layer and the permanent pycnocline by calculating obduction and subduction rates with Argo dataset. The results show that the entrained permanent pycnocline water impacts the ML temperature and salinity, especially in specific regions like the Circumpolar Current and tropical oceans. Additionally, changes in obduction and subduction related to a marine heatwave in the northeastern North Pacific around 2014 were examined.
JOURNAL OF OCEANOGRAPHY
(2021)
Article
Meteorology & Atmospheric Sciences
Mizuki Iida, Shusaku Sugimoto, Toshio Suga
JOURNAL OF CLIMATE
(2020)
Article
Environmental Sciences
Annie P. S. Wong, Susan E. Wijffels, Stephen C. Riser, Sylvie Pouliquen, Shigeki Hosoda, Dean Roemmich, John Gilson, Gregory C. Johnson, Kim Martini, David J. Murphy, Megan Scanderbeg, T. V. S. Udaya Bhaskar, Justin J. H. Buck, Frederic Merceur, Thierry Carval, Guillaume Maze, Cecile Cabanes, Xavier Andre, Noe Poffa, Igor Yashayaev, Paul M. Barker, Stephanie Guinehut, Mathieu Belbeoch, Mark Ignaszewski, Molly O'Neil Baringer, Claudia Schmid, John M. Lyman, Kristene E. McTaggart, Sarah G. Purkey, Nathalie Zilberman, Matthew B. Alkire, Dana Swift, W. Brechner Owens, Steven R. Jayne, Cora Hersh, Pelle Robbins, Deb West-Mack, Frank Bahr, Sachiko Yoshida, Philip J. H. Sutton, Romain Cancouet, Christine Coatanoan, Delphine Dobbler, Andrea Garcia Juan, Jerome Gourrion, Nicolas Kolodziejczyk, Vincent Bernard, Bernard Bourles, Herve Claustre, Fabrizio D'Ortenzio, Serge Le Reste, Pierre-Yve Le Traon, Jean-Philippe Rannou, Carole Saout-Grit, Sabrina Speich, Virginie Thierry, Nathalie Verbrugge, Ingrid M. Angel-Benavides, Birgit Klein, Giulio Notarstefano, Pierre-Marie Poulain, Pedro Velez-Belchi, Toshio Suga, Kentaro Ando, Naoto Iwasaska, Taiyo Kobayashi, Shuhei Masuda, Eitarou Oka, Kanako Sato, Tomoaki Nakamura, Katsunari Sato, Yasushi Takatsuki, Takashi Yoshida, Rebecca Cowley, Jenny L. Lovell, Peter R. Oke, Esmee M. van Wijk, Fiona Carse, Matthew Donnelly, W. John Gould, Katie Gowers, Brian A. King, Stephen G. Loch, Mary Mowat, Jon Turton, E. Pattabhi Rama Rao, M. Ravichandran, Howard J. Freeland, Isabelle Gaboury, Denis Gilbert, Blair J. W. Greenan, Mathieu Ouellet, Tetjana Ross, Anh Tran, Mingmei Dong, Zenghong Liu, Jianping Xu, KiRyong Kang, HyeongJun Jo, Sung-Dae Kim, Hyuk-Min Park
FRONTIERS IN MARINE SCIENCE
(2020)
Review
Geochemistry & Geophysics
Gregory C. Johnson, Shigeki Hosoda, Steven R. Jayne, Peter R. Oke, Stephen C. Riser, Dean Roemmich, Tohsio Suga, Virginie Thierry, Susan E. Wijffels, Jianping Xu
Summary: Argo, an international network of nearly 4,000 autonomous robotic profiling floats, has revolutionized physical oceanography. After two decades, Argo data have supported thousands of scientific publications and improved real-time forecasts and projections.
ANNUAL REVIEW OF MARINE SCIENCE
(2022)
Article
Oceanography
Daiki Ito, Toshio Suga, Shinya Kouketsu, Eitarou Oka, Yoshimi Kawai
Summary: The study conducted five high-resolution hydrographic sections at the periphery of an anticyclonic mesoscale eddy north of the Kuroshio Extension to explore the evolution of submesoscale structure associated with mesoscale eddies. The results showed that submesoscale filaments, composed of cold and fresh water originating from the subarctic region, contribute to rapid water mass transport and effective mixing, influenced by strain fields, convergence, geostrophic forcing, and vertical shear of horizontal velocity. These findings suggest the important role of submesoscale filaments in water mass transport and transformation around mesoscale eddies in the Kuroshio Extension region.
JOURNAL OF OCEANOGRAPHY
(2021)
Editorial Material
Oceanography
Dean Roemmich, Lynne Talley, Nathalie Zilberman, Emily Osborne, Kenneth Johnson, Leticia Barbero, Henry Bittig, Nathan Briggs, Andrea Fassbender, Gregory Johnson, Brian King, Elaine McDonagh, Sarah Purkey, Stephen Riser, Toshio Suga, Yui Takeshita, Virginie Thierry, Susan Wijffels
Article
Oceanography
Fumika Sambe, Toshio Suga
Summary: In the mid-latitude northwest Pacific Ocean, the meeting and mixing of subtropical and subarctic waters give rise to unique oceanographic structures. This study uses unsupervised clustering to analyze temperature and salinity profiles from Argo float in this region and compares the results to previous knowledge. The findings show that this method can accurately capture the distribution and features of different oceanographic structures, with the relative abundance of each structure quantified on a grid. Additionally, it is discovered that the flow path of the Kuroshio Extension affects the distribution of some structures.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Engineering, Ocean
W. Brechner Owens, Nathalie Zilberman, Ken S. Johnson, Herve Claustre, Megan Scanderbeg, Susan Wijffels, Toshio Suga
Summary: OneArgo is an expansion of the Argo program that aims to provide comprehensive global ocean data by extending the coverage and measurements of physical and biogeochemical variables. Large-scale regional pilots are currently being conducted to refine the technology and infrastructure necessary for collecting research-quality data for a fully global OneArgo.
MARINE TECHNOLOGY SOCIETY JOURNAL
(2022)
Review
Environmental Sciences
Dean Roemmich, Matthew H. Alford, Herve Claustre, Kenneth Johnson, Brian King, James Moum, Peter Oke, W. Brechner Owens, Sylvie Pouliquen, Sarah Purkey, Megan Scanderbeg, Toshio Suga, Susan Wijffels, Nathalie Zilberman, Dorothee Bakker, Molly Baringer, Mathieu Belbeoch, Henry C. Bittig, Emmanuel Boss, Paulo Calil, Fiona Carse, Thierry Carval, Fei Chai, Diarmuid O. Conchubhair, Fabrizio d'Ortenzio, Giorgio Dall'Olmo, Damien Desbruyeres, Katja Fennel, Ilker Fer, Raffaele Ferrari, Gael Forget, Howard Freeland, Tetsuichi Fujiki, Marion Gehlen, Blair Greenan, Robert Hallberg, Toshiyuki Hibiya, Shigeki Hosoda, Steven Jayne, Markus Jochum, Gregory C. Johnson, KiRyong Kang, Nicolas Kolodziejczyk, Arne Kortzinger, Pierre-Yves Le Traon, Yueng-Djern Lenn, Guillaume Maze, Kjell Arne Mork, Tamaryn Morris, Takeyoshi Nagai, Jonathan Nash, Alberto Naveira Garabato, Are Olsen, Rama Rao Pattabhi, Satya Prakash, Stephen Riser, Catherine Schmechtig, Claudia Schmid, Emily Shroyer, Andreas Sterl, Philip Sutton, Lynne Talley, Toste Tanhua, Virginie Thierry, Sandy Thomalla, John Toole, Ariel Troisi, Thomas W. Trull, Jon Turton, Pedro Joaquin Velez-Belchi, Waldemar Walczowski, Haili Wang, Rik Wanninkhof, Amy F. Waterhouse, Stephanie Waterman, Andrew Watson, Cara Wilson, Annie P. S. Wong, Jianping Xu, Ichiro Yasuda
FRONTIERS IN MARINE SCIENCE
(2019)