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MyOcean2 First Annual Meeting – 17-18 April 2013

WP 12 THEMATIC & ASSEMBLY CENTRE for Sea Level MyOcean2 First Annual Meeting – Cork /16-17 April 2013. MyOcean2 First Annual Meeting – 17-18 April 2013. Work Package Main Objectives. Scientific objectives are

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MyOcean2 First Annual Meeting – 17-18 April 2013

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  1. WP 12THEMATIC & ASSEMBLYCENTRE for SeaLevel MyOcean2 First Annual Meeting – Cork /16-17 April 2013 MyOcean2 First Annual Meeting – 17-18 April 2013

  2. Work Package Main Objectives • Scientific objectives are • Improve the quality of current SL TAC products (along track products, gridded products) thanks to the feedbacks coming from MyOcean Users (external , intenal) and from WP17 (calval) & WP18 (multiyear assessment) activities • Finalize the development of new products. New generation for assimilation (TAPAS). Collaboration with MFCs needed • Technical objectives are • Improve and consolidate the processing chains (both for NRT and DT/REP products) • New version of the system more configurable to manage global and regional processing • Operational objectives are • Continue to operate the system with integration of evolution (new algo, new products) • Handle the constellation events, new missions (AltiKa, Sentinel-3, Jason3) • Improve the product latency • Do and enrich the Service to EEA (new climate indicators) MyOcean2 First Annual Meeting – 17-18 April 2013

  3. Partnership Coordination CLS CLS IMEDEA DTU LEGOS Cal/Val Cal/Val Cal/Val Service R&D R&D R&D Operation System Engineering 1998 1998…… …….2012… Development Maintenance From the idea to the transition to operations Cal/Val R&D MyOcean2 First Annual Meeting – 17-18 April 2013

  4. System Evolution 10 versions of the system installedbetween V2 and V3

  5. System Evolution • Objectives were • New version of the system more configurable to manage global and regional processing • Main achievements are • Systementirely redeveloped (python). Big effort done this year • Day to day management of the constellation changes • Constellation is getting old=> requires effort to maintain the level of quality • Main difficulties encountered • Visualisation of Sea Level products (along track) is not possible today. This should be possible in V4 • Difficult to manage main Myocean Version (3&4) and the daily constraints (constellation) MyOcean2 First Annual Meeting – 17-18 April 2013

  6. System Evolution March/April 2012: loss of Envisat Jason-1 gap • March/April 2013: • Jason-1 gap (15 days) • Jason-2 gap (12 days) • No reference • mission earlyapril June 2012 February 2013 Jason-2 Jason-1 Geodetic Cryosat J1N Envisat Mean Contribution (%) • The SL-TAC productqualitydepends on the health of the altimetry constellation. • The constellation isgettingold: Jason-1 is 12 yrold, Jason-2 hadits first unavailibilitythismonthafteralmost five years of operation • We are verylucky to have Cryosat-2 in the system Impact on SL-TAC productsquality: Errorincrease Error (% of variance)

  7. SLA measured by Cryosat-2 in the Arcticregionduring the historical minimum of seaicecoverage on the 15th septembre 2012 Gridded SLA mapcomputedfrom Jason-1 & 2 Along track SLA data fromCryosat (CNES processor) • Cryosat-2 integrationwas one of the sucess story of Myocean-1 SeaiceboundaryfromMyocean • Success story Myo1

  8. System Evolution • New satellites have to beused • Altika has been launched on 25th of Februarythisyear. Currently in Calval phase. It willbeintegrated in the DUACS/SL-TAC system in the 2ndhalf of the year • HY2A has the technicalcapability of measuring good SeaLevel (payload). Preliminaryassessment has proved the interest of these data. Fine assessment of the productstill in progress. • =>Sentinel-3 is needed ! Jason-2/ HY2A SLA map (demo) Legeais et al 2012 • Importance of Myocean interface/coordination withspace component (Level 2)

  9. System Evolution • Objectives were • New version of the system • Main achievements are • Systementirely redeveloped (python) more configurable to manage global and regional processing • Management of the constellation changes • Constellation is getting old=> requires effort to maintain the level of quality • Main difficulties encountered • Visualisation of Sea Level products (along track) is not possible today. This should be possible in V4 • Difficult to manage main Myocean Version (3&4) and the daily constraints (constellation) MyOcean2 First Annual Meeting – 17-18 April 2013

  10. Production Evolution • Objectives were • Improve SL products and develop innovative products • Main achievements are • Increase of the delivery rate: Since Feb 2013, The SLTAC process “on the fly” the altimetry products and thus deliver new products every 1 hours => Up to 24h of additional data depending on the running time start of the model available for global product for J1and J2 (C2 coming soon) • Definition of the Tapas products • Preparation of the Reprocessing activity • Provision of Mean Sea Level trend to EEA for the European region • Main difficulties encountered • DGF parametrization for “on the fly” products • Manage users from AVISO/Myocean: we have to handle users from both sides MyOcean2 First Annual Meeting – 17-18 April 2013

  11. Production Evolution V3 « On the fly » processingavailablesinceFebruary 2 daysago 1 dayago today 21 daysago • Near Real time DUACS processing Real time processing Daily delivery Deliveryevery 1H Assimilation system => Up to 24h of additional data depending on the running time start of the model

  12. Production Evolution • Objectives were • Improve SL products and develop innovative products • Main achievements are • Increase of the delivery rate: Since Feb 2013, The SLTAC process “on the fly” the altimetry products and thus deliver new products every 1 hours => Up to 24h of additional data depending on the running time start of the model available for global product for J1and J2 (C2 coming soon) • Definition of the Tapas products (foreseen for June) • Preparation of the Reprocessing activity • Provision of Mean Sea Level trend to EEA for the European region • Main difficulties encountered • DGF parametrization for “on the fly” products • Manage users from AVISO/Myocean: we have to handle users from both sides MyOcean2 First Annual Meeting – 17-18 April 2013

  13. Production Evolution • TAPAS Experiment • Tailored Product for Assimilation • 2nd workshop in June in Barcelona • Performance of Tapas products have been estimated using the regional IBI Mercator model Meansalinitymisfit (psu) RMS salinitymisfit (psu) Model/InsituMisfitwith assimilation of TAPAS product - no filter and not correctedfromatmosphericeffect (DAC) Model/Insitu Misfit with assimilation of conventionalproduct Better consistency between the model and in situ data for salinity => promising result Operational delivery of Tapas product for Med MFC foresee mid 2013 -0.4 0.4 0.0 0.4

  14. Production Evolution SLA Spectrum (m2.km) usinghigh rate altimetry data (20Hz) over a small Pacific area (From Boy et al 2012) • Conventionalaltimetry limitation • All existingaltimeterspresenthigh spectral energybelow 100 km whichisexplained by the large LRM footprint • At 70km errorrepresent 50% of the signal energy (spatial limit) • SAR processing is very promising • Cryosat-2 measuressomespecificregions in SAR mode => we observe clean SSHA spectrum down to 50 km and spatial limitseems to be close to 30 km • SAR processingisverypromising to improve the alongtrackresolution of altimetryproducts and pave the way for highresolutionaltimetry (Sentinel 3) 100 km 50 km 30 km Theorical Linearenergydecrease Jason-2 LRM Cryosat-2 SAR 103 102 101 10-1 km

  15. Production Evolution • Objectives were • Improve the data latency • Main achievements are • Increase of the delivery rate: Since Feb 2013, The SLTAC process “on the fly” the altimetry products and thus deliver new products every 1 hours => Up to 24h of additional data depending on the running time start of the model available for global product for J1and J2 (C2 coming soon) • Definition of the Tapas products • Preparation of the Reprocessing activity (foreseen for V4) • Provision of Mean Sea Level trend to EEA for the European region • Main difficulties encountered • DGF parametrization for “on the fly” products • Manage users from AVISO/Myocean: we have to handle users from both sides MyOcean2 First Annual Meeting – 17-18 April 2013

  16. Production Evolution • A 20 year period precise altimetry time series: more than 60 years of cumulated data from 10 sensors • New altimeters standards : New GDR ESA & CNES reprocessing (ENVISAT GDR2.1, Jason-2 GDR-D, REAPER…) • Improvement of the mapping technic • New merging tuning : Better continuity between missions, new filtering wavelenght for along-track data, new correlation scales SLA contours and oceancolor on 20/11/2011 The eddies are better reproduced with the new version of the correlation scales MyOcean2 First Annual Meeting – 17-18 April 2013

  17. Production Evolution • A 20 year period precise altimetry time series: more than 60 years of cumulated data from 10 sensors • New altimeters standards : New GDR ESA & CNES reprocessing (ENVISAT GDR2.1, Jason-2 GDR-D, REAPER…) • Improvement of the mapping technic • New merging tuning : Better continuity between missions, new filtering wavelenght for along-track data, new correlation scales • 2 –steps mapping and bathymetry constraint • Wavenumberspectral slopes obtained from the new satellite-derived fields reveal a more realistic cascade of eddy energy. • From Escudier et al 2012 Along track Grid HR+ Bathy Grid Grid HR MyOcean2 First Annual Meeting – 17-18 April 2013

  18. Production Evolution  Changing the reference period can modify the SLA instantaneous signature of the specifics structures of the global surface circulation. It does not modify the Absolute Dynamic Topography. • New reference priod : SLA, MSS and MDT referenced to the [1993,2012] period instead of current [1993, 1999] period. Fig: SLA along a meridional section crossing the theKuroshio in December 2011. The reference change will impact the mean of the SLA at regional scales 20-y reference [1993, 2012] 7-y reference [1993,1999] 3-y reference [1993,1995] cm

  19. Production Evolution • Objectives were • Improve the data latency • Main achievements are • Increase of the delivery rate: Since Feb 2013, The SLTAC process “on the fly” the altimetry products and thus deliver new products every 1 hours => Up to 24h of additional data depending on the running time start of the model available for global product for J1and J2 (C2 coming soon) • Definition of the Tapas products • Preparation of the Reprocessing activity • Provision of Mean Sea Level trend (SPC) to EEA for the European region • Main difficulties encountered • DGF parametrization for “on the fly” products • Manage users from AVISO/Myocean: we have to handle users from both sides MyOcean2 First Annual Meeting – 17-18 April 2013

  20. Productsassessment • Assessment of SL TAC regional products • Focus on Arctic and Mediterranean sea • Development of new diagnosis to assess Sea level product performances • Developpment of Lagrangian algorithm Exemple of Finite size LyapounovExponents (FSLE) mapscomputedfrom Global and regionalaltimetry data for the January 2003 Navidadevent (From Dussurget et al) MyOcean2 First Annual Meeting – 17-18 April 2013

  21. First period summary and next steps • Several improvement for SL TAC system and product • New system allowing a better latency of the product • Big work in the management of the constellation events • Definition of new Tapas products that will fullfill the MFC need • Good perspectives in the near future • Integration of Altika data in the system (and maybe HY2A) • A New generation of product in V4 • A complete reprocessing of the entire altimetry series (20 years) in V4 • Nex steps: toward high resolution altimetry • SAR altimetry data seems to have the potential to detect small scale structures (30 to 50 km) on instantaneous observations • Work has to continue to prepare future missions (Sentinel-3 and Jason-CS) MyOcean2 First Annual Meeting – 17-18 April 2013

  22. END MyOcean2 First Annual Meeting – 17-18 April 2013

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