MyOcean2 First Annual Meeting – April 2013 WP 12 THEMATIC & ASSEMBLY CENTRE for Sea Level MyOcean2 First Annual Meeting – Cork /16-17 April 2013

Work Package Main Objectives MyOcean2 First Annual Meeting – April 2013 n Scientific objectives are n 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 n Finalize the development of new products. New generation for assimilation (TAPAS). Collaboration with MFCs needed n Technical objectives are n 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 n Operational objectives are n Continue to operate the system with integration of evolution (new algo, new products) n Handle the constellation events, new missions (AltiKa, Sentinel-3, Jason3) n Improve the product latency n Do and enrich the Service to EEA (new climate indicators)

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

System Evolution 10 versions of the system installed between V2 and V3

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

J1N 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 early april Cryosat Jason-2 Jason-1 Geodetic Impact on SL-TAC products quality: Error increase Envisat System Evolution Error (% of variance) Mean Contribution (%) June 2012 February 2013 The SL-TAC product quality depends on the health of the altimetry constellation. The constellation is getting old: Jason-1 is 12 yr old, Jason-2 had its first unavailibility this month after almost five years of operation We are very lucky to have Cryosat-2 in the system The SL-TAC product quality depends on the health of the altimetry constellation. The constellation is getting old: Jason-1 is 12 yr old, Jason-2 had its first unavailibility this month after almost five years of operation We are very lucky to have Cryosat-2 in the system

Success story Myo1 SLA measured by Cryosat-2 in the Arctic region during the historical minimum of sea ice coverage on the 15th septembre 2012 Gridded SLA map computed from Jason-1 & 2 Along track SLA data from Cryosat (CNES processor) Sea ice boundary from Myocean Cryosat-2 integration was one of the sucess story of Myocean-1

Jason-2/ HY2A SLA map (demo) Legeais et al 2012 System Evolution New satellites have to be used Altika has been launched on 25th of February this year. Currently in Calval phase. It will be integrated in the DUACS/SL-TAC system in the 2 nd half of the year HY2A has the technical capability of measuring good Sea Level (payload). Preliminary assessment has proved the interest of these data. Fine assessment of the product still in progress. =>Sentinel-3 is needed ! Importance of Myocean interface/coordination with space component (Level 2)

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

Production Evolution MyOcean2 First Annual Meeting – April 2013 n Objectives were n Improve SL products and develop innovative products n Main achievements are n 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) n Definition of the Tapas products n Preparation of the Reprocessing activity n Provision of Mean Sea Level trend to EEA for the European region n Main difficulties encountered n DGF parametrization for “on the fly” products n Manage users from AVISO/Myocean: we have to handle users from both sides

1 day agotoday Assimilation system 21 days ago 2 days ago Near Real time DUACS processingReal time processing Daily delivery Delivery every 1H => Up to 24h of additional data depending on the running time start of the model V3 « On the fly » processing available since February Production Evolution

MyOcean2 First Annual Meeting – April 2013 n Objectives were n Improve SL products and develop innovative products n Main achievements are n 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) n Definition of the Tapas products (foreseen for June) n Preparation of the Reprocessing activity n Provision of Mean Sea Level trend to EEA for the European region n Main difficulties encountered n DGF parametrization for “on the fly” products n Manage users from AVISO/Myocean: we have to handle users from both sides

Production Evolution n TAPAS Experiment Tailored Product for Assimilation 2 nd workshop in June in Barcelona Mean salinity misfit (psu)RMS salinity misfit (psu) Model/Insitu Misfit with assimilation of conventional product Model/Insitu Misfit with assimilation of TAPAS product - no filter and not corrected from atmospheric effect (DAC) Performance of Tapas products have been estimated using the regional IBI Mercator model Better consistency between the model and in situ data for salinity => promising result Operational delivery of Tapas product for Med MFC foresee mid 2013 Better consistency between the model and in situ data for salinity => promising result Operational delivery of Tapas product for Med MFC foresee mid 2013

n Conventional altimetry limitation All existing altimeters present high spectral energy below 100 km which is explained by the large LRM footprint At 70km error represent 50% of the signal energy (spatial limit) n SAR processing is very promising Cryosat-2 measures some specific regions in SAR mode => we observe clean SSHA spectrum down to 50 km and spatial limit seems to be close to 30 km SAR processing is very promising to improve the along track resolution of altimetry products and pave the way for high resolution altimetry (Sentinel 3) 50 km30 km Theorical Linear energy decrease Production Evolution SLA Spectrum (m2.km) using high rate altimetry data (20Hz) over a small Pacific area (From Boy et al 2012) km Jason-2 LRM Cryosat-2 SAR 100 km

Production Evolution MyOcean2 First Annual Meeting – April 2013 n Objectives were n Improve the data latency n Main achievements are n 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) n Definition of the Tapas products n Preparation of the Reprocessing activity (foreseen for V4) n Provision of Mean Sea Level trend to EEA for the European region n Main difficulties encountered n DGF parametrization for “on the fly” products n Manage users from AVISO/Myocean: we have to handle users from both sides

 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 MyOcean2 First Annual Meeting – April 2013 SLA contours and ocean color on 20/11/2011 Production Evolution The eddies are better reproduced with the new version of the correlation scales

 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 MyOcean2 First Annual Meeting – April 2013 Production Evolution Wavenumber spectral slopes obtained from the new satellite- derived fields reveal a more realistic cascade of eddy energy. From Escudier et al 2012 Along track Grid Grid HR Grid HR+ Bathy

 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 the Kuroshio in December The reference change will impact the mean of the SLA at regional scales  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. 20-y reference [1993, 2012] 7-y reference [1993,1999] 3-y reference [1993,1995] cm Production Evolution

MyOcean2 First Annual Meeting – April 2013 n Objectives were n Improve the data latency n Main achievements are n 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) n Definition of the Tapas products n Preparation of the Reprocessing activity n Provision of Mean Sea Level trend (SPC) to EEA for the European region n Main difficulties encountered n DGF parametrization for “on the fly” products n Manage users from AVISO/Myocean: we have to handle users from both sides

Products assessment n Assessment of SL TAC regional products n Focus on Arctic and Mediterranean sea n Development of new diagnosis to assess Sea level product performances n Developpment of Lagrangian algorithm MyOcean2 First Annual Meeting – April 2013 Exemple of Finite size Lyapounov Exponents (FSLE) maps computed from Global and regional altimetry data for the January 2003 Navidad event (From Dussurget et al)

First period summary and next steps MyOcean2 First Annual Meeting – April 2013 n Several improvement for SL TAC system and product n New system allowing a better latency of the product n Big work in the management of the constellation events n Definition of new Tapas products that will fullfill the MFC need n Good perspectives in the near future n Integration of Altika data in the system (and maybe HY2A) n A New generation of product in V4 n A complete reprocessing of the entire altimetry series (20 years) in V4 n 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)

END MyOcean2 First Annual Meeting – April 2013