Abstract The warm sea surface temperature (SST) bias in the Southern Ocean (SO) has persisted several generations of Coupled Model Inter-comparison Project (CMIP) models, yet origins such a remain controversial. Using latest CMIP6 here we find that SST SO features zonally oriented non-uniform pattern mainly located between northern and southern fronts Antarctic Circumpolar Current. This common is not likely to be caused by biases heat flux or strength Atlantic meridional overturning...

Abstract. The methods used to identify coherent ocean eddies are either Eulerian or Lagrangian in nature, and nearly all existing eddy datasets based on the method. In this study, millions of particles advected by satellite-derived surface geostrophic velocities over period 1993–2019. Using method Lagrangian-averaged vorticity deviation (LAVD), we present a global dataset (GLED v1.0, Liu Abernathey, 2022, https://doi.org/10.5281/zenodo.7349753). This open-source contains not only general...

Abstract An idealized eddy‐resolving ocean basin, closely resembling the North Pacific Ocean, is simulated using MITgcm. We identify rotationally coherent Lagrangian vortices (RCLVs) and sea surface height (SSH) eddies based on Eulerian framework, respectively. General statistical results show that RCLVs have a much smaller core than SSH with ratio of radius about 0.5. are often enclosed by anomaly contours, but eddy identification method fails to detect more half RCLVs. Based their...

The large discrepancy between Eulerian and Lagrangian work motivates us to examine the leakage of eddies quantify contribution coherent eddy transport in South China Sea (SCS). In this study, particles with a resolution 1/32° are advected by surface geostrophic currents derived from satellite observations spanning 23 years, two types methods employed identify sea height (SSH) structures. SSH proven be highly leaky during their lifetimes, more than 80% original water leaking out interior. As...

Abstract Seasonal characteristics and nonlinear interaction of internal tides (ITs) near the Luzon Strait in northeastern South China Sea are investigated using 285 day, situ observation data. It is found that ITs, which dominated by first‐mode wave throughout year, strongest subsurface layer. Baroclinic incoherent diurnal (semidiurnal) variance accounts for about 85.7% (78.3%) ITs. The amplitude seasonal variation ITs more prominent than those semidiurnal, e.g., largest kinetic energy...

Most of the classic wind-driven circulation theories based on Sverdrup balance have neglected profound influence eddy mixing large-scale potential vorticity (PV) distribution, thus failing to explain some prominent features observed circulation. In this study, using a series numerical experiments MITgcm, we diagnose PV quantify effect subtropical gyre. Four horizontal grid-spacings 1°, 1/3.2°, 1/10°, and 1/32° are selected compare structure upper-ocean examine different influences. 1° grid...

Abstract The circulation of the Kuroshio northeast Taiwan is characterized by a large anticyclonic loop surface intrusion and strong upwelling at shelfbreak. To study mechanisms intrusions, vorticity balance examined using high-resolution nested numerical model. In 2D depth-averaged equation, advection geostrophic potential (APV) term joint effect baroclinicity relief (JEBAR) are dominant. On other hand, in depth-integrated main between nonlinear bottom pressure torque. It shown that JEBAR...

Abstract Two recently proposed mixing diagnostics are employed to estimate the global surface irreversible based on particle and tracer simulation driven by satellite-derived geostrophic velocities. These two novel diagnostics, similar traditional dispersion diffusivity Nakamura’s effective but defined in a localized instantaneous sense, have following advantages: 1) they reconcile theoretical discrepancies between Eulerian-, particle-, contour-based diffusivities 2) do not rely stationary...

Abstract. This study reports a moored array dataset (MASCS 1.0) consisting of five buoys and four moorings in the northern South China Sea during 2014–2015. The includes measurements sea surface meteorological data using two sets instruments: waves recorded wave recorder, temperature salinity from to depth 400 m, at 10 m 50 above ocean bottom conductivity, temperature, (CTD) recorders. It also currents 850 measured acoustic Doppler current profilers (ADCPs) 100 meters. Additional were taken...

An idealized eddy-resolving ocean basin, closely resembling the North Pacific ocean, is simulated using MITgcm. We identify rotationally coherent Lagrangian vortices (RCLVs) and sea surface height (SSH) eddies based on Eulerian framework, respectively. General statistical results show that RCLVs have a much smaller core than SSH with ratio of radius about 0.5. are often enclosed by SSHA contours, but eddy identification method fails to detect more half RCLVs. Based their locations, two types...

Satellite observations demonstrate that mesoscale eddies are active and show significant spatial variability of surface features in the southeastern Indian Ocean (SEIO). Combining satellite observation Argo floats data, this study reveals variation eddy vertical structure volume-integrated energy SEIO. The sources surface-intensified subsurface-intensified correspond well to mean current systems. cyclonic (CEs) mainly originate from South Countercurrent system, whose density core is at a...

The methods used to identify coherent ocean eddies are either Eulerian or Lagrangian in nature, and nearly all existing eddy datasets based on the method. In this study, millions of particles advected by satellite-derived surface geostrophic velocities over period 1993–2019. Using method Lagrangian-averaged vorticity deviation (LAVD), we present a global dataset (GLED v1.0). This open-source dataset contains not only general features (eddy center position, equivalent...

<title>Abstract</title> Anticyclonic eddies (AEs) are a common feature of ocean circulation and play significant role in influencing the rates carbon fixation export. However, mechanism underlying organic (OC) export sedimentation modulated by AEs poorly deciphered. Here, we utilized in-situ observations dissolved oxygen, chlorophyll, pH, turbidity water column experimental analyses molecular biomarkers, OC, iron trioxide sediments from East China Sea, to unravel processes driving OC AE. Our...

Abstract. This work presents a cross-shaped moored array dataset (MASCS 1.0) comprising five buoys and four moorings with synchronous atmospheric oceanic data in the northern South China Sea during 2014–2015. The are observed by two meteorological instruments at buoys. consist of sea surface waves measured using wave recorder, temperature, salinity from to depth 400 m 10 50 above ocean bottom conductivity, recorders. They also include currents 850 acoustic Doppler current profilers 10, 50,...

Abstract A series of numerical simulations with different forcing conditions are carried out, to investigate the roles played by buoyancy and wind on upper ocean gyres, contrast laminar eddying regimes. Model experiments show that buoyancy-driven eastward geostrophic flow tends suppress formation wind-driven subpolar gyre, but northward eddy heat transport can homogenize water reduce meridional temperature gradient about two-third, thus counteracting effect saving gyre. For subtropical its...

Abstract. The methods used to identify coherent ocean eddies are either Eulerian or Lagrangian in nature, and nearly all existing eddy dataset based on the method. In this study, millions of particles advected by satellite-derived surface geostrophic velocities over period 1993–2019. Using method Lagrangian-averaged vorticity deviation (LAVD), we present a global (GLED v1.0, Liu Abernathey, 2022, https://doi.org/10.5281/zenodo.7349753). This open-source contains not only general features...

Mesoscale eddies propagate westward in the northwestern Pacific Ocean and interact with Kuroshio vicinity of western boundary ocean. However, processes affecting eddy properties detailed structure when they encounter remain unclear. In this study, we analyze statistics around using 25 years satellite altimeter data eddy-resolving OFES model product. The spatial compositions show that, as westward, their radius amplitude decrease sharply approach region. radius, amplitude, kinetic energy...

Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Oceans. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]On Role Eddy Mixing in Subtropical Ocean CirculationAuthorsTongyaLiuiDHsien-WangOuiDXiaohuiLiuDakeChenSee all authors Tongya LiuiDCorresponding Author• Submitting...