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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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slide1

WP 12THEMATIC & ASSEMBLYCENTRE for SeaLevel

MyOcean2 First Annual Meeting – Cork /16-17 April 2013

MyOcean2 First Annual Meeting – 17-18 April 2013

work package main objectives
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

partnership
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

system evolution
System Evolution

10 versions of the system installedbetween V2 and V3

system evolution1
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

system evolution2
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)

slide7

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
system evolution3
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)
system evolution4
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

production evolution
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

production evolution1
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

production evolution2
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

production evolution3
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

production evolution4
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

production evolution5
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

production evolution6
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

production evolution7
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

production evolution8
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

production evolution9
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

products assessment
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

first period summary and next steps
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

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MyOcean2 First Annual Meeting – 17-18 April 2013