For decades now, satellite altimetric observations have been successfully integrated in numerical oceanographic models using data assimilation (DA). So far, sea surface height (SSH) were provided by one-dimensional nadir altimeters. The next generation Surface Water and Ocean Topography (SWOT) altimeter will provide two-dimensional wide-swath information with an unprecedented high resolution. This new type of SSH is expected to strongly improve assimilation. However, the SWOT also be...

Abstract Wide‐swath altimetry, for example, the Surface Water and Ocean Topography mission is expected to provide Sea Height (SSH) measurements resolving scales of a few tens kilometers. Over large fraction globe, SSH signal at these essentially superposition component due balanced motions (BMs) another internal tides (ITs). Several oceanographic applications require separation components their mapping on regular grids. For that purpose, paper introduces an alternating minimization algorithm...

Abstract During the past 25 years, altimetric observations of ocean surface from space have been mapped to provide two dimensional sea height (SSH) fields that are crucial for scientific research and operational applications. The SSH can be reconstructed conventional data using temporal spatial interpolation. For instance, standard Developing Use Altimetry Climate Studies (DUACS) products created with an optimal interpolation method is effective both low resolution. However, upcoming...

Abstract. One challenge of geophysical data assimilation is to address the issue non-Gaussianities in distributions physical variables ensuing, many cases, from nonlinear dynamical models. Non-Gaussian ensemble analysis methods fall into two categories, those remapping particles by approximating best linear unbiased estimate, for example, Kalman filter (EnKF), and resampling directly applying Bayes' rule, like particle filters. In this article, it suggested that most common can only handle...

In recent years, there has been increased interest in applying data assimilation (DA) methods, originally designed for state estimation, to the model selection problem. this setting, previous studies introduced contextual formulation of evidence, or evidence (CME), and showed that CME can be efficiently computed using a hierarchy ensemble‐based DA procedures. Although these analysed methods most commonly used operational atmospheric oceanic prediction worldwide, they did not study...

The Surface Water and Ocean Topography (SWOT) mission is a next generation satellite expected to provide 2 km-resolution observation of the sea surface height (SSH) on two-dimensional swath. Processing SWOT data will be challenging because large amount data, mismatch between high spatial resolution low temporal resolution, errors. present paper focuses reduction spatially structured errors SSH data. It investigates new error method assesses its performance in an observing system simulation...

Earth and Space Science Open Archive This work has been accepted for publication in Science. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing an older version [v1]Go to new versionMapping altimetry the forthcoming SWOT era by back-and-forth nudging one-layer quasi-geostrophic modelAuthorsFlorianLe...

We introduce a new strategy designed to help physicists discover hidden laws governing dynamical systems. propose use machine learning automatic differentiation libraries develop hybrid numerical models that combine components based on prior physical knowledge with neural networks. In these architectures, named Deep Neural Numerical Models (DNNMs), the network are used as building-blocks then deployed for variables of underlying this paper, we illustrate an application DNNMs upper ocean...

Abstract. Accurately predicting the seasonal streamflow supply (SSS), i.e., inflow into a reservoir accumulated during snowmelt season (April to August), is critical operating hydroelectric dams and avoiding hydrology-related hazard. Such forecasts generally involve numerical models that simulate hydrological evolution of basin. The operational department French electric company Electricité de France (EDF) implements semi-distributed model has carried out such for several decades on about 50...

Abstract. For over 25 years, satellite altimetry has provided invaluable information about the ocean dynamics at many scales. In particular, gridded sea surface height (SSH) maps allow us to estimate mesoscale geostrophic circulation in ocean. However, conventional interpolation techniques rely on static optimal schemes, hence limiting estimation of non-linear scales not well sampled by (i.e., below 150–200 km mid-latitudes). To overcome this limitation resolution small-scale SSH structures...

<p>Because of the irregular sampling pattern raw altimeter data, many oceanographic applications rely on information from sea surface height (SSH) products gridded regular grids where gaps have been filled with interpolation. Today, operational SSH are created using simple, but robust, optimal interpolation (OI) method. If well tuned, OI becomes computationally cheap and provides accurate results at low resolution. However, is not adapted to produce high resolution frequency...

The Surface Water and Ocean Topography (SWOT) mission is a next generation satellite expected to provide 2km-resolution observation of the sea surface height (SSH) on two-dimensional swath. Processing SWOT data will be challenging, because large amount data, mismatch between high spatial resolution low temporal resolution, errors. present paper focuses reduction spatially structured errors SSH data. It investigates new error method assesses its performance in an observing system simulation...

The Surface Water and Ocean Topography (SWOT) mission offers two-dimensional measurements of Sea Height (SSH), capturing scales a few tens kilometers enabling the study previously unobserved short mesoscale dynamical structures. However, faces technical challenges in maximizing scientific benefits, particularly during science phase with its 21-day repeat orbit, which limits observations small-scale structure evolution over time. To address challenge high spatial low temporal samplings, we...

The SLICING (Sea Level Innovations and Collaborative Intercomparison for the Next-Generation products) project is a Copernicus Service Evolution that responds to evolving landscape of sea level processing. promotes novel approach centered on open collaborative data challenges altimetric product developments assessments. With focus fostering collaboration methodological advancement, aligns with objectives Marine (CMEMS) overarching spirit European Digital Twin Ocean (DTO).   growing...

The upcoming Surface Water Ocean Topography (SWOT) satellite altimetry mission is expected to yield two-dimensional high-resolution measurements of Sea Height (SSH), thus allowing for a better characterization the mesoscale and submesoscale eddy field. However, fulfill promises this mission, filtering tidal component SSH necessary. This challenging problem crucial since posterior studies done by physical oceanographers using SWOT data will depend heavily on selected schemes. In paper, we...

During the past 25 years, altimetric observations of ocean surface from space have been mapped to provide two dimensional sea height (SSH) fields which are crucial for scientific research and operational applications. The SSH can be reconstructed conventional data using temporal spatial interpolation. For instance, standard DUACS products created with an optimal interpolation method is effective both low resolution. However, upcoming next-generation SWOT mission will very high resolution but...

Abstract. For over 25 years, satellite altimetry has provided invaluable information about the ocean dynamics at many scales. In particular, gridded Sea Surface Height (SSH) maps allow to estimate mesoscale geostrophic circulation in ocean. However, conventional interpolation techniques rely on static optimal schemes, hence limiting estimation of non linear scales not well sampled by (i.e. below 150–200 km mid latitudes). To overcome this limitation resolution small-scale SSH structures (and...

<p><span>For 20 years, ocean surface topography maps, essential for understanding the circulation, have been built by statistically interpolating sea height (SSH) data provided along-track nadir altimeters.<strong><span>  </span></strong>The space-time distribution of observed limits resolution maps to approximately 150 km and days in wavelength. The launch next-generation SWOT altimetry mission...

For decades now, satellite altimetric observations have been successfully integrated in numerical oceanographic models using data assimilation (DA). So far, sea surface height (SSH) were provided by one-dimensional nadir altimeters. The next generation Surface Water and Ocean Topography (SWOT) altimeter will provide two-dimensional wide-swath information with an unprecedented high resolution. This new type of SSH is expected to strongly improve assimilation. However, the SWOT also be...