This study validated wind speed (WS) and significant wave height (SWH) retrievals from the Sentinel-3A/3B Jason-3 altimeters for period of data beginning 31 October 2019 (to 18 September Jason-3) using moored buoy satellite Meteorological Operational Satellite Program (MetOp-A/B) Advanced Scatterometer (ASCAT) data. The spatial temporal scales collocated were 25 km 30 min, respectively. statistical metrics root mean square error (RMSE), bias, correlation coefficient (R), scatter index (SI)...

Abstract. This study investigated the statistics of eddy splitting and merging in global oceans based on 23 years altimetry data. Multicore structures were identified using an improved geometric closed-contour algorithm sea surface height. Splitting events discerned from continuous time series maps level anomalies. represent intermediate stage process evolution, similar to generation multiple nuclei a cell as preparatory phase for division. Generally, or can substantially change (by factor 2...

This paper presents an innovative approach to enhance the assimilation of high-resolution simulated observations, specifically targeting Surface Water Ocean Topography (SWOT) Ka-band Radar Interferometer Sea Height (SSH) products, within Regional Modeling System (ROMS). Responding demand for improved techniques, we developed a multi-scale Four-Dimensional Variational Data Assimilation (4DVAR) system, building upon validated fine-scale correction capabilities from prior studies. The strategy...

Mesoscale eddies can significantly influence the surface and deep layers of ocean, leading to diverse outcomes. Particularly, high-amplitude mesoscale possess vertical structures that reach thousands meters, carrying greater kinetic energy. Accurately detecting such is crucial for various applications, ranging from promoting marine economic development ensuring navigational safety. This study presents a cutting-edge algorithm eddy identification, leveraging multi-task learning multi-source...

Doppler mis-registrations in azimuth can lead to ocean waves shorter than a specific wavelength being undetectable by SAR. In order evaluate the actual wave observation ability, accuracy of Sentinel-1 SAR spectra from January 2016 December 2021 is evaluated comparisons NDBC buoys, ERA5 height, and CMEMS buoys. The results compared with show that spectral shape accurate, while values need be improved. have best observations season autumn. comparison total height RMSE bias are 0.91 m −0.52 for...

Oceanic mesoscale eddies are a kind of typical geostrophic dynamic process which can cause vertical movement in water bodies, thereby changing the temperature, salinity, density, and chlorophyll concentration surface eddy. Based on multisource remote sensing data Argo profiles, this study analyzes compares eddy properties four major western boundary current regions (WBCs), i.e., Kuroshio Extension (KE), Gulf Stream (GS), Agulhas Current (AC), Brazil (BC). The 30-year sea height anomaly...

Vigorous mesoscale eddies are broadly distributed in the Kuroshio Extension and can generally be identified from sea surface height (SSH) temperature (SST) fields. Nevertheless, changes SSH SST caused by their seasonal correlation not clear, as well difference between eddy results two data. Combining situ Argo float profiles data, anomaly (SSHA) (SSTA) signals analyzed. The result shows that SSTA–SSHA inside more correlated winter than summer. subsurface anomalies θ′ SSHA show a high...

Abstract. Based on satellite altimetry data spanning over 26 years in combination with Argo profile or three-dimensional (3D) reprocessed thermohaline fields, the eddy synthesis method was used to construct vertical temperature and salinity structures of eddies Bay Bengal, seasonal properties heat salt transport by were analyzed. Analysis revealed that mesoscale activities Bengal have evident variation. Temperature anomalies caused are usually between ±1 ±3 ∘C (positive for anticyclonic...

HY-2A, which was launched on 16 August 2011, is the Chinese first microwave ocean dynamics environment satellite. Analyses of HY-2A daily sea-level anomaly data and HY-2A–Jason-2 (H-J) dual crossover differences show that has measurement mainly refer to an orbit error. H-J HY-2A–HY-2A (H-H) give estimate Smoothing cubic-spline functions are then used obtain a continuous estimation error over time. On basis simultaneous global minimization H-H differences, observation efficiently reduced...

Abstract. This study investigated the statistics of eddy splitting and merging in global oceans based on 23 years’ altimetry data. Multicore structures were identified using an improved threshold-free closed-contour algorithm sea surface height. Splitting events discerned from continuous time series maps level anomalies. represent intermediate stage process evolution, similar to generation multiple nuclei a cell as preparatory phase for division. Generally, or can change substantially (by...

For the impact of land, sea ice, rainfall and strong wind, wet tropospheric correction (WTC) HY-2C (the third marine dynamic environmental monitoring satellite China) altimeter cannot be obtained accurately by calibration microwave radiometer (CMR) over coastal ocean. The conducted evaluation CMR WTC ocean Global Navigation Satellite System (GNSS) ECMWF Reanalysis v5 (ERA5) data showed that is abnormal or invalid. To solve this issue, a new method to determine based on objective analysis...

Mesoscale eddies are common in global oceans, playing crucial roles ocean dynamics, circulation, and heat transport, their vertical structures can affect the water layers from tens to thousands of meters. In this study, we integrated sea surface height temperature data into deep learning methods study mesoscale eddy subsurface structure explore relationship between layers. introduce Dual_EddyNet, a algorithm designed invert eddies. Using algorithm, impact on inversion Furthermore, compare...

This study employs the two-dimensional Legendre polynomial fitting (2-D LPF) method to fit M2 tidal harmonic constants from satellite altimetry data within region of 53°E–131°E, 34°S–6°N, extracting internal tide signals acting on sea surface. The are derived surface height (SSH) TOPEX/Poseidon (T/P), Jason-1, Jason-2, and Jason-3 satellites via t-tide analysis. We validate 2-D LPF against 300 km moving average (300 smooth) one-dimensional (1-D method. Through cross-validation across 42...

Abstract High-quality merged altimetry sea level products have been instrumental in analyzing oceanic dynamics, spanning global and regional trends, capturing interannual signals, but effectively characterizing mesoscale features remains a persistent issue. The essence of addressing this challenge lies the selection highly correlated data sources for fusion, within confines limited discrete observations from surface altimeters. To tackle challenge, we propose refined method focused on...

Abstract. Based on satellite altimetry data spanning over 26 years in combination with Argo profile or three‐dimensional (3D) reprocessed thermohaline fields, the eddy synthesis method was used to construct vertical temperature and salinity structures of eddies Bay Bengal, seasonal properties heat salt transport by were analyzed. Analysis revealed that mesoscale activity Bengal has evident variation, which notable impact circulation system within entire bay. Temperature anomalies caused are...

As an important remote sensing technology, satellite altimetry provides a large amount of observations sea surface height over the global ocean. In coastal areas, accuracy data decreases greatly due to issues arise in vicinity land, related poorer geophysical corrections and artifacts altimeter reflected signals linked presence land within instrument footprint. To improve application HY-2B this study proposes waveform retracking strategy for mission, which depends on effective trailing edge...