Shoichiro Kido
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View article: Increasing Annual Subduction and Obduction Rates in the North Pacific Revealed by an Eddy‐Resolving Ocean Reanalysis
Increasing Annual Subduction and Obduction Rates in the North Pacific Revealed by an Eddy‐Resolving Ocean Reanalysis Open
Subduction and obduction are water mass exchanges between the ocean mixed layer (ML) and the permanent pycnocline. Knowledge of how they change in a warming climate is of great importance to anticipating how warming will affect material ci…
View article: Revisiting the Kuroshio Frontal Eddies in the East China Sea: Insights From the Eddy Energy Budget
Revisiting the Kuroshio Frontal Eddies in the East China Sea: Insights From the Eddy Energy Budget Open
Kuroshio frontal eddies in the East China Sea (ECS) have been observed and investigated for a long time; however, the energetics of frontal eddy‐mean flow interactions remain unclear. In this study, we revisit the Kuroshio frontal eddies i…
View article: Mesoscale eddy influence on North Pacific air–sea heat exchange in a high-resolution ocean reanalysis
Mesoscale eddy influence on North Pacific air–sea heat exchange in a high-resolution ocean reanalysis Open
Thanks to advances in satellite observations and high-resolution ocean/climate modeling, the importance of ocean mesoscale eddies has been increasingly recognized in recent decades. However, more comprehensive and quantitative assessment o…
View article: On cyclostationary linear inverse models: a mathematical insight and implication
On cyclostationary linear inverse models: a mathematical insight and implication Open
Cyclostationary linear inverse models (CS-LIMs) are advanced data-driven techniques for extracting first-order time-dependent dynamics and random forcing information from cyclostationary observational data. This study focuses on the mathem…
View article: Colored linear inverse model: A data-driven method for studying dynamical systems with temporally correlated stochasticity
Colored linear inverse model: A data-driven method for studying dynamical systems with temporally correlated stochasticity Open
In real-world problems, environmental noise is often idealized as Gaussian white noise, despite potential temporal dependencies. The linear inverse model (LIM) is a class of data-driven methods that extract dynamic and stochastic informati…
View article: Interactive annular mode links jet stream-ocean coupling to decadal Northern Hemispheric warmth
Interactive annular mode links jet stream-ocean coupling to decadal Northern Hemispheric warmth Open
The atmospheric jet stream governs the distribution and intensity of midlatitude weather systems and climate variability. In the Northern Hemisphere, meridional migrations of the jet stream are directly linked to the frequency and magnitud…
View article: Interactive annular mode links jet stream-ocean coupling to decadal Northern Hemispheric warmth
Interactive annular mode links jet stream-ocean coupling to decadal Northern Hemispheric warmth Open
The atmospheric jet stream governs the distribution and intensity of midlatitude weather systems and climate variability. In the Northern Hemisphere, meridional migrations of the jet stream are directly linked to the frequency and magnitud…
View article: Gulf Stream drives Kuroshio behind the recent abnormal ocean warming
Gulf Stream drives Kuroshio behind the recent abnormal ocean warming Open
Recent unprecedented ocean warming has produced coherent sea surface temperature (SST) anomalies across the Northern Hemisphere extratropics. Despite extensive research on inter-basin interactions, the causal mechanisms linking North Pacif…
View article: Comment on “Resolving the Tropical Pacific/Atlantic Interaction Conundrum” by Feng Jiang et al. (2023)
Comment on “Resolving the Tropical Pacific/Atlantic Interaction Conundrum” by Feng Jiang et al. (2023) Open
Jiang et al. (2023), https://doi.org/10.1029/2023gl103777 argue that the apparent impact of the equatorial Atlantic on El Niño‐Southern Oscillation (ENSO) is a statistical artifact, and that the 6‐month lead correlation reported in previou…
View article: The international multi-system OSEs/OSSEs by the UN Ocean Decade Project SynObs and its early results
The international multi-system OSEs/OSSEs by the UN Ocean Decade Project SynObs and its early results Open
“Synergistic Observing Network for Ocean Prediction (SynObs)” was launched in 2022 as a project of the United Nations Decade of Ocean Science for Sustainable Development to evaluate the importance of ocean observation systems and co-design…
View article: Marine heatwave in the Oyashio region in 2022/23 and its impact on subsurface dissolved oxygen
Marine heatwave in the Oyashio region in 2022/23 and its impact on subsurface dissolved oxygen Open
The Oyashio region east of northern Japan has experienced frequent marine heatwaves (MHWs) since 2010, and in the summer and fall of 2022, sea surface temperature hit a record high as of that year. This study examined the impact of the 202…
View article: Exploring 6-month lead predictability of the Atlantic zonal mode in CMIP
Exploring 6-month lead predictability of the Atlantic zonal mode in CMIP Open
Skillful prediction of the equatorial Atlantic zonal mode (AZM) remains challenging, with many prediction systems dropping below an anomaly correlation coefficient (ACC) of 0.5 beyond a lead time of 3 months. Since the El Niño-Souther…
View article: Tropical Atmospheric Intraseasonal Oscillations Leading to Sea Level Extremes in Coastal Indonesia during Recent Decades
Tropical Atmospheric Intraseasonal Oscillations Leading to Sea Level Extremes in Coastal Indonesia during Recent Decades Open
Coastal flooding induced by sea surface high extreme (HEX) events is an increasing risk to human society and infrastructure as both urban growth in coastal areas and anthropogenic sea level rise continue, especially for island nations like…
View article: Skillful Multiyear Prediction of the Kuroshio and Gulf Stream Jets and Eddy Activity
Skillful Multiyear Prediction of the Kuroshio and Gulf Stream Jets and Eddy Activity Open
The Kuroshio and Gulf Stream (GS), Northern Hemisphere warm ocean currents, have narrow bands of intense jets and vigorous eddies. While the importance of them in regulating physical and biological ocean systems and climate has been increa…
View article: Classification of Interannual Surface Layer Salinity Variability
Classification of Interannual Surface Layer Salinity Variability Open
Since surface layer salinity (SLS) mainly reflects sea surface freshwater flux and affects ocean circulation and upper ocean stratification by modifying seawater density, knowledge of SLS variability is important to better understand the g…
View article: The tropical Atlantic as a negative feedback on ENSO
The tropical Atlantic as a negative feedback on ENSO Open
The influence of the tropical Atlantic on El Niño-Southern Oscillation (ENSO) is examined using dedicated climate model experiments with sea-surface temperature (SST) restoring. Partial SST restoring to climatology in the tropical Atlantic…
View article: JCOPE-FGO: an eddy-resolving quasi-global ocean reanalysis product
JCOPE-FGO: an eddy-resolving quasi-global ocean reanalysis product Open
In the present research, we provide a brief description and assessment of the oceanic fields analyzed in the newly developed eddy-resolving quasi-global ocean reanalysis product, named the Japan Coastal Ocean Predictability Experiments-For…
View article: Sea Surface Temperature–Salinity Covariability and Its Scale‐Dependent Characteristics
Sea Surface Temperature–Salinity Covariability and Its Scale‐Dependent Characteristics Open
Sea surface temperature and salinity (SST/SSS) are critical to understanding the ocean's role in the climate system. Because seawater density is controlled by temperature and salinity, characterizing the relationship between these two vari…
View article: Data for Kohyama et al. (2021)
Data for Kohyama et al. (2021) Open
This is model data used in the Kohyama et al (2021). -MIROC6 and MIROC6subhires (MATLAB (.mat) files) The data described as AGCM is from the Atmospheric General Circulation Model experiments. The rest is from fully-coupled runs. --AGCMcont…
View article: Data for Kohyama et al. (2021)
Data for Kohyama et al. (2021) Open
This is model data used in the Kohyama et al (2021). -MIROC6 and MIROC6subhires (MATLAB (.mat) files) The data described as AGCM is from the Atmospheric General Circulation Model experiments. The rest is from fully-coupled runs. --AGCMcont…
View article: Climate-driven sea level extremes compounded by marine heatwaves in coastal Indonesia
Climate-driven sea level extremes compounded by marine heatwaves in coastal Indonesia Open
The low-lying coastal and island regions are vulnerable to sea level rise and extreme events. Compounded by marine heatwaves, sea level extremes have devastating impacts on coastal community and marine ecosystems. As long tide gauge record…
View article: Reexamining the tropical Atlantic influence on ENSO using perfect model predictability experiments
Reexamining the tropical Atlantic influence on ENSO using perfect model predictability experiments Open
<p>The potential influence of the tropical Atlantic on the development of ENSO has received increased attention over recent years. In particular equatorial Atlantic variability (also known as the Atlantic zonal mode or AZM) has been …
View article: Intensive Variability Extraction
Intensive Variability Extraction Open
A modified version of the principal component analysis (PCA) is introduced by reconsidering statistical degrees of freedom in spatial dimensions based on spatial auto-correlations. In the conventional PCA, data points that represent equal …
View article: Gulf Stream and Kuroshio Current are synchronized
Gulf Stream and Kuroshio Current are synchronized Open
Sea surface temperatures (SSTs) of the Gulf Stream and the Kuroshio are shown to be synchronized for the decadal time scale. This synchronization, which we refer to as the Boundary Current Synchronization (BCS), is associated with meridion…
View article: A Sustained Ocean Observing System in the Indian Ocean for Climate Related Scientific Knowledge and Societal Needs
A Sustained Ocean Observing System in the Indian Ocean for Climate Related Scientific Knowledge and Societal Needs Open
© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hermes, J. C., Masumoto, Y., Beal, L. M., Roxy, M. K., Vialard, J., Andres, M., Annamal…