Abstract Automated eddy detection methods are fundamental tools to analyze activity from the large datasets derived satellite measurements and numerical model simulations. Existing either based on distribution of physical parameters usually computed velocity derivatives or geometry streamlines around minima maxima sea level anomaly. A new algorithm was developed exclusively vectors. Four constraints characterizing spatial vectors centers were general features associated with fields in...

Abstract Density stratification and planetary rotation distinguish three-dimensional island wakes significantly from a classical fluid dynamical flow around an obstacle. A numerical model is used to study the formation evolution of idealized in deep water (i.e., with vertical sides surface-intensified upstream flow), focusing on wake instability, coherent vortex formation, mesoscale submesoscale eddy activity. In baseline experiment strong vorticity generation at island, three types...

Cyclonic (anticyclonic) oceanic eddies drive local upwelling (downwelling), leaving footprints in the sea surface temperature (SST) field as extremes. Satellite-measured SST images can therefore be used to obtain information of characteristics eddies. Remotely sensed measurements represent very large data sets, both spatially and temporally. Manual eddy detection analysis are thus practically impossible. In this letter, an automated scheme for from remote sensing is presented. The method...

Abstract We examined atmospheric responses to 35,000+ oceanic eddies in the Kuroshio Extension region during period of 2006–2009. Using satellite data, we showed that cold (warm) cause surface winds decelerate (accelerate) and reduce (increase) latent sensible heat fluxes, cloud liquid water, water vapor content, rain rate; all these changes are quantified. Both linear correlation between wind divergence downwind sea temperature (SST) gradient correspondence vorticity crosswind SST support...

Abstract The spatial scale of submesoscales is an important parameter for studies submesoscale dynamics and multiscale interactions. horizontal scales baroclinic, geostrophic-branch mixed layer instabilities (MLI) are investigated globally (without the equatorial or Arctic oceans) based on observations simulations in surface bottom layers away from significant topography. Three high-vertical-resolution boundary schemes driven with profiles a MITgcm global submesoscale-permitting model...

Abstract Amongst the variety of oceanic processes running gamut spatiotemporal scales, mesoscale eddies are most common and often have region-specific characteristics. The large kinetic energy inherent to themselves is a strong modulator global climate, ocean circulation, productivity, freshwater transport. This study uses multi-source satellite remote sensing observation data construct multi-parameter eddy dataset for 1993–2019 period, which differs significantly from few previous published...

Understanding the mechanisms that create spatial heterogeneity in species distributions is fundamental to ecology. For nearshore marine systems, most have a pelagic larval stage where dispersal strongly influenced by patterns of ocean circulation. Concomitantly, habitats and local environment are also Because shared dependence on seascape, distinguishing relative importance from regional for community structure remains challenge. Here, we quantify "oceanographic distance" asymmetry" between...

Abstract The Kuroshio Extension region is well known for its strong eddy activity. In this paper, using satellite altimetry‐measured sea surface height anomaly data from 1993 to 2012 in an extended (140–180°E, 25–45°N), we analyze characteristics: size, polarity, lifetime, intensity, trajectory, and spatial temporal distributions. Using temperature salinity vertical profiles measured by Argo floats, examine the impact on stratification. During 20‐year period, 7,574 eddies are identified...

This review describes the climate change–induced responses of tropical atmospheric circulation and their impacts on hydrological cycle. We depict theoretically predicted changes diagnose physical mechanisms for observational model-projected trends in large-scale regional climate. The slows down with moisture stratification changes, connecting to a poleward expansion Hadley cells shift intertropical convergence zone. Redistributions precipitation consist thermodynamic dynamical components,...

Abstract Observations, primarily from satellites, have shown a statistical relationship between the surface wind stress and underlying sea temperature (SST) on intermediate space time scales, in many regions inclusive of eastern boundary upwelling current systems. In this paper, empirical SST–wind is utilized to provide simple representation mesoscale air–sea coupling for an oceanic model forced by winds, namely, Regional Oceanic Modeling System (ROMS). This formulation applied idealized...

Using collocated altimetry sea surface height anomalies (SSHA) and Argo profiles within detected eddies, we investigated structures of temperature, salinity, potential density, geostrophic current, mixed layer depth (MLD), vorticity (PV), buoyancy frequency (N) in the Kuroshio Extension (KE) region under influences oceanic eddies. We identified 54,302 eddies (snapshots) KE during period 1999–2013. The composite analysis showed that changes physical parameters modulated by climatological...

Oceanic mesoscale cyclonic (anticyclonic) eddies usually have cold (warm) cores and counterclockwise (clockwise) flow fields in the Northern Hemisphere. However, “abnormal” with warm (cold) recently been identified Kuroshio-Oyashio Extension (KOE) region. Here, traditional cold-core (CCEs) anticyclonic warm-core (AWEs) are termed normal eddies, (CWEs) (ACEs) called abnormal eddies. Applying a vector geometry-based automatic eddy detection method to Ocean General Circulation Model for Earth...

Using satellite altimetry sea surface height anomalies (SSHA) and Argo profiles, we investigated eddy’s statistical characteristics, 3-D structures, eddy-induced physical parameter changes, heat/freshwater transports in the South China Sea (SCS). In total, 31,744 cyclonic eddies (CEs, snapshot) 29,324 anticyclonic (AEs) were detected SCS between 1 January 2005 31 December 2016. The composite analysis has uncovered that changes parameters modulated by are mainly confined to upper 400 m....

Mesoscale eddies are important to ocean circulation due their roles in the transport of mass, energy, and heat. This study employs a combination data sources initiate statistical analysis eddy spatiotemporal characteristics Bay Bengal (BOB) elucidate sea surface vertical structures impacts on chlorophyll (Chl) distributions. The results suggest that 1237 cyclonic (CEs) 1121 anticyclonic (AEs) were detected 26 years. number two polarities was almost same, most them spread west or southwest...

Abstract As one kind of submesoscale instability, symmetric instability (SI) the ocean surface mixed layer (SML) plays a significant role in modulating SML energetics and material transport. The small spatial scales SI, O (10 m–1 km), are not resolved by current climate models most regional models. This study describes comparisons an idealized configuration SI parameterization scheme proposed Bachman et al. (2017, https://doi.org/10.1016/j.ocemod.2016.12.003 ) (SI‐parameterized) versus...

Identifying oceanic eddy from remotely sensed sea surface height (SSH) data is challenging, mainly because of its large-size variations. This article proposes an automatic identification model upon convolutional neural networks for dealing with this issue. The proposed network comprised two branches: branch and edge extraction branch. Both them adopt encoder–decoder frameworks, the encoder shared each other. simultaneously uses multiscale convolution modules in skip-layer connections between...

Air-sea interface fluxes significantly impact the reliability and efficiency of maritime communication. Compared to sparse in-situ ocean observations, satellite remote sensing data offers broader coverage extended temporal span. This study utilizes COARE V3.5 algorithm calculate momentum flux, sensible heat latent flux at air-sea interface, based on synthetic aperture radar (SAR) wind speed data, reanalysis buoy measurements, combined with neural network methods. Findings indicate that SAR...

Marine heatwaves (MHWs) can significantly impact marine ecosystems and socio-economic systems, their severity may increase with global warming. Nevertheless, research on the onset decline rates of MHWs remains limited, historical future variations are not yet fully understood. This study, therefore, analyzes spatiotemporal characteristics MHW by using sea surface temperature data from OISSTv2.1 CMIP6. The results indicate that during period 1982 to 2014, were higher in eddy-active...