Contribution of future wide-swath altimetry missions  to ocean analysis and forecasting

Bonaduce, Antonio; Benkiran, Mounir; Rémy, E.; Traon, Pierre‐Yves Le; Garric, Gilles

doi:10.5194/os-14-1405-2018

Cited by 23 publications

(29 citation statements)

References 52 publications

(82 reference statements)

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“…The impact of a constellation of two wide-swath altimetry missions was investigated with the same IBI data assimilation system (Bonaduce et al, 2018). This assessment was carried out as part of an ESA study on the potential role of wide-swath altimetry for the long-term (post 2030) evolution of the Copernicus satellite component.…”

Section: Wide-swath Altimetrymentioning

confidence: 99%

From Observation to Information and Users: The Copernicus Marine Service Perspective

et al. 2019

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The Copernicus Marine Environment Monitoring Service (CMEMS) provides regular and systematic reference information on the physical and biogeochemical ocean and sea-ice state for the global ocean and the European regional seas. CMEMS serves a wide range of users (more than 15,000 users are now registered to the service) and applications. Observations are a fundamental pillar of the CMEMS value-added chain that goes from observation to information and users. Observations are used by CMEMS Thematic Assembly Centres (TACs) to derive high-level data products and by CMEMS Monitoring and Forecasting Centres (MFCs) to validate and constrain their global and regional ocean analysis and forecasting systems. This paper presents an overview of CMEMS, its evolution, and how the value of in situ and satellite observations is increased through the generation of high-level products ready to be used by downstream applications and services. The complementary nature of satellite and in situ observations is highlighted. Le Traon et al. Copernicus Marine Service: Observations Long-term perspectives for the development of CMEMS are described and implications for the evolution of the in situ and satellite observing systems are outlined. Results from Observing System Evaluations (OSEs) and Observing System Simulation Experiments (OSSEs) illustrate the high dependencies of CMEMS systems on observations. Finally future CMEMS requirements for both satellite and in situ observations are detailed.

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Section: Wide-swath Altimetrymentioning

confidence: 99%

From Observation to Information and Users: The Copernicus Marine Service Perspective

et al. 2019

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“…The impact of forthcoming wide-swath altimetry missions was investigated at Mercator Ocean with OSSEs using a 1/12 •resolution regional ODAP system of the Iberian-Biscay-Ireland (IBI) region (Lellouche et al, 2013). The synthetic observations are derived from the Nature Run simulated by the same OGCM at 1/36 • resolution over the same region (Bonaduce et al, 2018). All the experiments assimilated the same synthetic observations of SST and temperature and salinity profiles.…”

Section: Evaluation Of Impact Of Wide-swath Altimetry Missionsmentioning

confidence: 99%

Observing System Evaluation Based on Ocean Data Assimilation and Prediction Systems: On-Going Challenges and a Future Vision for Designing and Supporting Ocean Observational Networks

et al. 2019

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This paper summarizes recent efforts on Observing System Evaluation (OS-Eval) by the Ocean Data Assimilation and Prediction (ODAP) communities such as GODAE OceanView and CLIVAR-GSOP. It provides some examples of existing OS-Eval methodologies, and attempts to discuss the potential and limitation of the existing approaches. Observing System Experiment (OSE) studies illustrate the impacts of the severe decrease in the number of TAO buoys during 2012-2014 and TRITON buoys since 2013 on ODAP system performance. Multi-system evaluation of the impacts of assimilating satellite sea surface salinity data based on OSEs has been performed to demonstrate the need to continue and enhance satellite salinity missions. Impacts of underwater gliders have been assessed using Observing System Simulation Experiments (OSSEs) to provide guidance on the effective coordination of the western North Atlantic observing system elements. OSSEs are also being performed under H2020 AtlantOS Fujii et al.Observing System Evaluation project with the goal to enhance and optimize the Atlantic in-situ networks. Potential of future satellite missions of wide-swath altimetry and surface ocean currents monitoring is explored through OSSEs and evaluation of Degrees of Freedom for Signal (DFS). Forecast Sensitivity Observation Impacts (FSOI) are routinely evaluated for monitoring the ocean observation impacts in the US Navy's ODAP system. Perspectives on the extension of OS-Eval to coastal regions, the deep ocean, polar regions, coupled data assimilation, and biogeochemical applications are also presented. Based on the examples above, we identify the limitations of OS-Eval, indicating that the most significant limitation is reduction of robustness and reliability of the results due to their system-dependency. The difficulty of performing evaluation in near real time is also critical. A strategy to mitigate the limitation and to strengthen the impact of evaluations is discussed. In particular, we emphasize the importance of collaboration within the ODAP community for multi-system evaluation and of communication with ocean observational communities on the design of OS-Eval, required resources, and effective distribution of the results. Finally, we recommend further developing OS-Eval activities at international level with the support of the international ODAP (e.g., OceanPredict and CLIVAR-GSOP) and observational communities.

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“…This issue has received wide practical interest because of the forthcoming wide-swath altimetry planned for the Surface Water and Ocean Topography mission (SWOT; Fu et al 2009;Durand et al 2010;Qiu et al 2017). Altimetric observations of shorter mesoscale structures down to~15 km constitute a challenge for ocean analysis and forecasting (Bonaduce et al 2018) and can provide a valuable contribution to operational oceanography (Bell et al 2015;Le Traon et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Interactions between barotropic tides and mesoscale processes in deep ocean and shelf regions

Stanev

Ricker

2020

Ocean Dynamics

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The interactions between barotropic tides and mesoscale processes were studied using the results of a numerical model in which tidal forcing was turned on and off. The research area covered part of the East Atlantic Ocean, a steep continental slope, and the European Northwest Shelf. Tides affected the baroclinic fields at much smaller spatial scales than the barotropic tidal scales. Changes in the horizontal patterns of the M 2 and M 4 tidal constituents provided information about the two-way interactions between barotropic tides and mesoscale processes. The interaction between the atmosphere and ocean measured by the work done by wind was also affected by the barotropic tidal forcing. Tidal forcing intensified the transient processes and resulted in a substantial transformation of the wave number spectra in the transition areas from the deep ocean to the shelf. Tides flattened the sea-surface height spectra down to~k −2.5 power law, thus reflecting the large contribution of the processes in the high-frequency range compared to quasi-geostrophic motion. The spectra along sections parallel or normal to the continental slope differ from each other, which indicates that mesoscale turbulence was not isotropic. An analysis of the vorticity spectra showed that the flattening was mostly due to internal tides. Compared with the deep ocean, no substantial scale selectivity was observed on the shelf area. Particle tracking showed that the lengths of the Lagrangian trajectories increased by approximately 40% if the barotropic tidal forcing was activated, which contributed to changed mixing properties. The ratio between the horizontal and vertical scales of motion varied regionally depending on whether barotropic tidal forcing was included. The overall conclusion is that the barotropic tides affect substantially the diapycnal mixing.

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Contribution of future wide-swath altimetry missions to ocean analysis and forecasting

Cited by 23 publications

References 52 publications

From Observation to Information and Users: The Copernicus Marine Service Perspective

From Observation to Information and Users: The Copernicus Marine Service Perspective

Observing System Evaluation Based on Ocean Data Assimilation and Prediction Systems: On-Going Challenges and a Future Vision for Designing and Supporting Ocean Observational Networks

Interactions between barotropic tides and mesoscale processes in deep ocean and shelf regions

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