Synthesis of new scientific challenges for GODAE OceanView

Schiller, A.; Bell, Mike; Brassington, Gary B.; Brasseur, Pierre; Barciela, Rosa; Mey, P. De; Dombrowsky, E.; Gehlen, Marion; Hernández, Fabrice; Kourafalou, Vassiliki H.; Larnicol, Gilles; Traon, Pierre‐Yves Le; Martin, Matthew J.; Oke, Peter R.; Smith, G. C. Moore; Smith, Neville; Tolman, Hendrik L.; Wilmer-Becker, Kirsten

doi:10.1080/1755876x.2015.1049901

Cited by 14 publications

(14 citation statements)

References 39 publications

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“…In this study we investigated the potential impact of future constellations of satellite altimeters, based on nadir and wide-swath missions, using a regional ocean analysis and forecasting system implemented in the Iberian-Biscay-Ireland (IBI) region at a spatial resolution of 1/12 • . The system was validated against in situ and satellite observations and continues to provide operational services and ocean reanalysis (Sotillo et al, 2015) within the framework of the Copernicus Marine Environment and Monitoring Service (CMEMS). The system used in this study differs from operational systems in the sense that the same atmospheric forcings are used in both the hindcast and the forecast.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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Abstract. The impact of forthcoming wide-swath altimetry missions on the ocean analysis and forecasting system was investigated by means of OSSEs (observing system simulation experiments). These experiments were performed with a regional data assimilation system, implemented in the Iberian–Biscay–Ireland (IBI) region, at 1∕12∘ resolution using simulated observations derived from a fully eddy-resolving free simulation at 1∕36∘ resolution over the same region. The objective of the experiments was to assess the ability of different satellite constellations to constrain the ocean analyses and forecasts, considering both along-track altimeters and future wide-swath missions; consequently, the capability of the data assimilation techniques used in the Mercator Ocean operational system to effectively combine the different kinds of measurements was also investigated. These assessments were carried out as part of a European Space Agency (ESA) study on the potential role of wide-swath altimetry in future versions of the European Union Copernicus programme. The impact of future wide-swath altimetry data is evident for investigating the reliability of sea level values in OSSEs. The most significant results were obtained when looking at the sensitivity of the system to wide-swath instrumental error: considering a constellation of three nadir and two “accurate” (small instrumental error) wide-swath altimeters, the error in ocean analysis was reduced by up to 50 % compared to conventional altimeters. Investigating the impact of the repetitivity of the future measurements, the results showed that two wide-swath missions had a major impact on sea-level forecasting – increasing the accuracy over the entire time window of the 5-day forecasts – compared with a single wide-swath instrument. A spectral analysis underlined that the contributions of wide-swath altimetry data observed in ocean analyses and forecast statistics were mainly due to the more accurate resolution, compared with along-track data, of ocean variability at spatial scales smaller than 100 km. Considering the ocean currents, the results confirmed that the information provided by wide-swath measurements at the surface is propagated down the water column and has a considerable impact (30 %) on ocean currents (up to a depth of 300 m), compared with the present constellation of altimeters. The ocean analysis and forecasting systems used here are those currently used by the Copernicus Marine Environment and Monitoring Service (CMEMS) to provide operational services and ocean reanalysis. The results obtained in the OSSEs considering along-track altimeters were consistent with those derived from real data (observing system experiments, OSEs). OSSEs can also be used to assess the potential of new observing systems, and in this study the results showed that future constellations of altimeters will have a major impact on constraining the CMEMS ocean analysis and forecasting systems and their applications.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…There has been significant progress in ocean forecasting in recent years, which can be summarized as follows (Bell et al, 2015;Schiller et al, 2015):…”

Section: Trends and Future Developmentsmentioning

confidence: 99%

An Overview of Operational Oceanography

Schiller¹,

Mourre²,

Drillet³

et al. 2018

New Frontiers in Operational Oceanography

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Operational oceanography is like weather forecasting for the ocean, it provides estimates of ocean variables (temperature, currents, surface height, etc.) for the past, present, and future. There is a systematic focus on sustained operational ocean observing systems, estimates of the current state, short-range predictions and ocean reanalyses. Operational oceanography systems provide routine and fully supported production and delivery of oceanographic information at pre-determined and agreed upon service levels. Nowadays, many operational oceanography systems cover global-to-coastal marine environments, and physical and biogeochemical properties, with active research underway to eventually include ecosystems. Operational oceanography involves and benefits marine industries, service providers, government agencies, and research and development (R&D) providers.

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“…In many coastal regions of the world, there may not be enough observations to reliably estimate uncertainties of Journal of Operational Oceanography s141 numerical models, to assimilate in those models, and to enable deterministic forecasts (Schiller et al 2015). Therefore, it can be expected that probabilistic approaches will be widely used in the future, complementing the 'deterministic' approach, for quantifying uncertainties in coastal products, and for providing probabilistic forecasts.…”

Section: Probabilistic Approaches and Risk Assessment In The Coastalmentioning

confidence: 99%