COMBAT CMEMS Service Evolution 2 KOM Visio-conference, 16 April AZTI. Todos los derechos reservados

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1 COMBAT CMEMS Service Evolution 2 KOM Visio-conference, 16 April 2018

2 INDEX CONTEXT OBJECTIVES TEAM ORGANIZATION IMPACT AND RELEVANCE OF THE PROJECT FOR CMEMS PLAN TO INTERACT WITH TACs AND MFCs

3 CONTEXT The Mean Dynamic Topography (MDT) is a key reference surface needed for estimating the Absolute Dynamic Topography (ADT) and for the assimilation of altimetry data in ocean modelling systems in order to improve their analysis and forecast. Since 2004, global MDT solutions combining altimeter, gravimeter and in-situ data have been routinely calculated. These MDT solutions provide an accurate estimate of the MDT at spatial scales larger than 100 km. In coastal areas, the global MDT solutions calculated are often less accurate than in the open ocean: In-situ measurements are sparse. Errors on altimetry measurements are higher due to the limitations of altimetry.

4 CONTEXT & MAIN OBJECTIVE For instance, in the south-eastern Bay of Biscay (SE-BoB) the latest CNES-CLS13 MDT presents some anomalous patterns with respect to the mean surface circulation measured by a coastal HF radar (HFR). This calls for a new, specific calculation of the MDT in this specific area and opens the perspective for the systematic improvement of regional MDT in areas covered by a HFR or a network of HFRs. The main objective of COMBAT is to take advantage of the coastal HFR available in the SE-BoB to calculate an improved MDT solution in the coastal strip, by combining the high spatial and temporal resolution of the HFR velocities with other in situ and remote sensing measurements. Figure. (Top) The CNES-CLS13 MDT and (bottom) HFR surface currents over the SE BoB averaged for the period

5 TEAM o Dr. Claire Dufau, leads the Application and Projects of the Department Innovation & Business Solutions in CLS/Environmental Monitoring. o Dr. M-H Rio, Senior Scientist of the Department Innovation & Business Solutions in CLS/Environmental Monitoring. o Dr. Gilles Larnicol, head of the Department Innovation & Business Solutions in CLS/Environmental Monitoring. o Dr. Nadia Ayoub, Research Scientist of CNRS/LEGOS. o Dr. Anna Rubio, Senior Scientist of the Technologies Area in the Marine Research Division. o Julien Mader (M.Eng.), head of Marine Technologies Area in the Marine Research Division. o Dr. Luis Ferrer, Senior Scientist of the Technologies Area in the Marine Research Division. o Dr. Ainhoa Caballero, research scientist of Marine Technologies Area in the Marine Research Division. PI of the COMBAT project.

6 PLANNING: WORK PACKAGES WP4: Coordination, networking & Communication WP1 Task 1.1: Inter-comparison of HFR and altimetry data Task 1.2: Study of the different components of the surface currents in different resolution numerical models and HFR data. Task 1.3: Estimation of the geostrophic component from HFR surface currents fields and associated error. Task 1.4: Sensitivity study of the mean sea surface elevation for different integration periods.

7 PLANNING: WORK PACKAGES WP2: Development of a local MDT of the SE-BoB Task 2.1: Calculation of a regional MDT first guess Task 2.2: Calculation of synthetic mean geostrophic velocities from the HF radar velocities Task 2.3: Inversion of the HFR mean geostrophic velocities into a mean dynamic topography Task 2.4: Validation of the new regional MDT with in situ independent data WP3: Improving the interface for effective data assimilation of new altimetry products into numerical models Task 3.1: Combination of the new coastal MDT with SLA for ADT estimation Task 3.2: Elaboration of a roadmap for DA of the new MDT and potential impacts in CMEMS products.

8 PLANNING: MILESTONES & DELIVERABLES MILESTONES M1.1: The consistency of the physical signal within HFR, altimetry and numerical models in the study area, has been assessed. M1.2: HFR-derived geostrophic velocities are ready for WP2 and the sensitivity of the calculation of the mean sea surface elevation for different integration periods is assessed. M2.1: The data for the computation and validation of the new MDT is ready. M3.1: The methodology for the computation of the ADT is set. M4.1:KOM. M4.2: Mid-term review meeting (MFC and TAC coordinators). M4.3: Final meeting with CMEMS (MFC and TAC coordinators). DELIVERABLES D2.1: Coastal MDT including HFR data. D2.2: Report of the datamethods, results and conclusion of this WP. D3.1 Mean SLA and new ADT for the same period. D4.1: Quarterly progress reports and plans for the next quarter. D4.2 Mid-term report. D4.3: Meeting minutes. D4.4: Final report.

9 PLANNING: TIMELINE

10 IMPACT AND RELEVANCE OF THE PROJECT FOR CMEMS COMBAT has been designed taking into account the CMEMS Service Evolution Strategy and the needs notified by the operational centres during the last Copernicus Marine Week. Service Evolution Strategy, R&D priorities: Research Area 4.6: Seamless interactions between CMEMS and coastal systems. Research Area 4.3: Coupled ocean-marine weather information, surface currents and waves. Lot 3 of the Specifications for R&D activities for the service evolution of the CMEMS: Interactions with the coastal ocean. Key objective of Lot 3 from Improve the interface/interactions between coastal monitoring and modelling systems and CMEMS.

11 IMPACT AND RELEVANCE OF THE PROJECT FOR CMEMS Providing a validated and improved coastal MDT will directly benefit the CMEMS products based on altimetry, and their use in the coastal area monitoring. The delivery of a Mean SLA referred to the same period used in the computation of the MDT for the estimation of the ADT, will allow a more effective DA of new altimetry products into numerical models. Key cross-cutting challenge: Efficient monitoring of the sub-mesoscale - mesoscale interactions and processes in the coastal area. Improve satellite products near coast, creating synergies with in situ data, and establishing key observational references for allowing stronger links between regional products and downstream services.

12 IMPACT AND RELEVANCE OF THE PROJECT FOR CMEMS The methodology that will be developed for the SE-BoB could be transferable to other CMEMS areas, thanks to the global coverage of the altimetry and the increasing number of HFR systems in the European coasts. After an adaptation of the method to the particularities of their HFR system and of their ocean dynamics. Figure. (Top) Location of the IBIROOS HFR operational (green) and future (yellow) sites and their theoretical radial range (represented by the circles). (Bottom) Jason-2 altimeter tracks in IBIROOS area.

13 PLAN TO INTERACT WITH TACs AND MFCs The evaluation of the consistency of the physical signal within HFR, altimetry and numerical models in the coastal area will open direct impacts like the new coastal MDT including HFR data (needs of SEALEVEL TAC). The sensor synergy approach performed in WP1 will provide key information for improving a combined use of INSITU TAC and SEALEVEL TAC products, and guidelines for new coastal surface current products in MULTIOBS TAC. The benefits will be for the different MFCs and the nested coastal systems. The roadmap towards an effective DA of new altimetry products into numerical models.

14 Índice Txatxarramendi ugarte z/g Sukarrieta, Bizkaia Herrera Kaia. Portualdea z/g Pasaia, Gipuzkoa Astondo Bidea, Edificio 609 Parque Tecnológico de Bizkaia Derio, Bizkaia