marine core service my ocean wp 11 sea level thematic assembly center
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MarineCore
Service
MY OCEAN
WP 11Sea Level
Thematic Assembly Center
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Organisation Breakdown Structureand Partnership
Coordination CLS
CLS IMEDEA DTU LEGOS
Development Maintenance
Operation
System Engineering
Service
Cal/Val
R&D
Cal/Val Cal/Val Cal/Val
R&D R&D R&D
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
SL TAC main objectives
To integrate the pre-existing SSALTO/DUACS system (CNES/CLS) into the MyOcean System and Service
Address progressively the users needs covering all the MyOcean regions
To improve the assessment of the SL TAC products
Glo
bal
Glo
bal
Regio
nal
Med
Wes
t sh
elve Arti
c
Black
Se
a
Version 1 Version 2
MyOcean Annual meeting , 27-28 april 2010, Exeter
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
System&Service and Production: • Priority to the integration into the MyOcean System (PDR, AR)• Finalise the organisation of the Service• Take into account within MyOcean all the existing users• Deliver the V0 and V1 products: NRT black sea, REP global, med, black sea
• Be ready to integrate Cryosat 2 (by 2010) and AltiKa (beginning 2011) • Be ready to integrate Jason-1 EoL and Envisat new orbit missions
R&D and CalVal activities• Development of new products: Arctic and West Shelves (version2)• TAPAS (tailored products for assimilation) initiative
• Refine the KPI indicators • Synergy with in-situ data • Scientific validation of the SL products
MyOcean Annual meeting , 27-28 april 2010, Exeter
Reminder:SL TAC objectives for year 2
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Dev. & Maintenance
Implementation the MyOcean Version 1Reviews of June (PCDW) and September (AR) Documentation: PMP, SRD, ADD, SIOPM, etc…
System: New processing chain for Black sea product generationNew format (netcdf-CF compliant)Implementation of MIS-Gateway for interfacing with the MyOcean central system + others evolutions/corrections/improvements
MyOcean Annual meeting , 27-28 april 2010, Exeter
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
History of the version before MyOcean version 1- V9.3 installed (08/07/2010) : new MDT (MDT_CNES-CLS09), new corrections (new LWE corrections, new mean profiles,…)…
- V10 installed (november 2010): correspond to the release of MyOcean Version1, and processing of EnVISAT on its new orbit
History of the version since the beginning of MyOcean version 1 : - V10.0.2 installed (01/03/2011) : improvement of the netcdf format, update use of flag (RT/NRT)…
- V10.1.0 installed (29/03/2011): change processing of small tracks in regional chain,
Dev. & Maintenance
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Dev. & Maintenance
Service: A Version 1 Service Organisation was setup: based on existing organisation
(AVISO)
significant improvement with a better definition of the different roles
MyOcean Annual meeting , 27-28 april 2010, Exeter
Actor Identity Product Expert (*) Contact: MI.Pujol
Done by: CLS’ Altimetry Cal/Val team
Backup by: CLS’ Altimetry Cal/Val teamProduct Manager Done by: S.Labroue
Backup by: Y.FaugereScientific Expert Done by: G.Dibarboure
Backup by: MI.Pujol, Y.FaugereSystem Evolution Developer
Done by: F.Briol
Backup by: CLS’ Space Oceanography Division Developers
System Maintenance Developer (*)
Done by: F.Briol
Backup by: G.Dibarboure, CLS’ Developer TeamIT Support Operator (*)
Contact: P.Roumegoux
Done by: CLS’ Operational IT Support Team
Backup by: CLS’ Operational IT Support TeamService Desk (*) Contact: V.Rosmorduc
Done by: AVISO Service Team
Backup by: AVISO Service TeamSupport Operator (*) Done by: MH.Calvez
Backup by: G.Pontonnier, CLS/DT/SOO Team, F.BriolChange Manager Done by: S.Labroue
Backup by: Y.FaugereIncident Manager (*) Done by: F.Briol
Backup by: G.Dibarboure, Y.Faugere, S.Labroue, MI.Pujol
Service Manager Done by: A.Delamarche
Backup by: S.Labroue, V.Rosmorduc
DUACS/AVISO MyOcean
To be all together in MyOcean was an opportunity to become better …
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Users
Main challenge: Transition of the MyOcean V0 users towards MyOcean V1 products and access (web portal , MIS):
- Existing users (AVISO): We have worked to define a way to count them as MyOcean users and on the harmonisation of the AVISO and MyOcean license
- MyOcean version 0 users: More work is required to support and accompany the existing MyOcean Version 0 Users in their migration towards MyOcean version 1.Similarly to the external users, we also need to support the MFCs.
Difficulties: Change the habits support from us is really needed.
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Production
Service to EEA
Pre-processing and QCCommon for global and regional
Different tuning for global and regional and NRT and REP/DT
A - Acquire DataA.1 - Passive data delivery or FTP retrievalA.2 - Detect, Date, ignore duplicate and corrupted data flowA.3 - Delete OGDR measures when acquiring the same I GDR measuresA.4 - Synchronize the altimeter and auxiliary dataA.5 – Cut data in cycles/ passesA.6 – Store the data acquired in a database
B - Pre process dataB.1 - Apply consistent correction, ancillary data, models, references…B.2 – Merge short and large scales
C - Perform input checks and Quality ControlC.1 Edit raw dataC.2 Apply Specific algorithms (iono fi ltering, radiometer extrapolation...)C.3 Compute mono and multi-mission crossoversC.4 Validate crossovers
G - Perform output check and Quality ControlG.1 - Compute internal data Quality ControlG.2 - Compute product Quality ControlG.3 - Follow up data and products on long term
H - Do measures and built indicatorsH.1 - Build KI PH.2 - Build scientific metric
I - Store the built product datasetsI .1 - Delivery products on FTP serverI .2 - Update MI S Gateway with the last products
J - Archive / retrieve a “Product Dataset”
Level2 altimetry products
DUACS Outputs
Along track products
SLA
Quality control reports and
expert analysis
Generate Products
D - I nter calibrate & Unif yD.1 – Compute mono-satellite orbit error (OE) reductionD.2 – Compute multi-satellite OE reduction using a reference missionD.3 – Compute multi-satellite OE reduction without reference missionD.4 – Compute Long Wavelength Error (LWE) reduction with O.I .
E – Generate along track productE.1 – Generate Along track SLA product corrected by LWE and OEE.2 – Validate the SLA product with the previous one
F – Generate merged productF.1 – Generate gridded SLA product
Gridded products
Formal Error
MSLA
I ndicators
CalVal group
Internaluse
External users
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Production
Reprocessed DT NRT(RT)
RT on the fly
daily basis
J1, J2- ENVISAT (OGDR, IGDR)
Every 2 yearsInput data: reprocessed L2 (common standards)
a total of 55 years of data (T/P, Jason1/2, ERS-1/2, ENVISAT, GFO)
3 to 6 months basis
Objective to complete the REP time series with more accurate data
J1, J2- ENVISAT (GDR)
On the fly basis
J1, J2- ENVISAT (OGDR)
1991 01/09/2010 01/12/2010
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Cal/Val activities
A routine monitoring of the state of the altimeter observing system was set during the first year
Continue to refine
the algorithm in order to
better represent the main
events
Delivery of ScCR, ScVR
Mono-missionMulti-mission
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
• Near Real Time constellation frail due to the extension of the nominal duration of the ENVISAT and Jason-1 missions
• Jason-1 extension of life accepted (but will be re-discussed this year)
• ENVISAT on drifting orbit since november 2010
• Jason-2 : Nominal
• Cryosat2 (04/2010): a study has been performed to analyse the potential of data. It was presented during the Croysat2 workshop (feb, ESRIN/ESA)
Altimeter observing system status
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
- Extracted from the presentation “Cryosat2 : a mission of opportunity for MyOcean and oceanography, from theory to practice “
- Cryosphere mission less accurate for ocean• Data are not repetitive• less accurate (no radiometer, Ku band only)• Mesoscale sampling not optimal
Cryosat2, an opportunity for MyOcean
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Cryos
at
Jaso
n-2
ENVISAT
Jaso
n2 +
Cry
osat
ENVISAT +
Cry
osat
Jaso
n2 +
ENVIS
AT
Jaso
n2 +
Jas
on1
Jaso
n2 +
ENVIS
AT + C
ryos
at
Jaso
n2 +
Jas
on1
+ Cry
osat
Jaso
n2 +
Jas
on1
+ ENVIS
AT
02468
1012141618
RMS of differences to 4-satellite map (cm)
ENVISAT has the best 1-satellite sampling
Jason2 + Jason1 have the best 2-satellite sam-pling
Cryosat can reasonably replace ENVISAT or Ja-son-1
Main conclusions of the study:
Cryosat2 data quality is satisfying Cryosat2 can help to mitigate the upcoming loss of ENVISAT or
Jason1
Unfortunately Cryosat2 data will probably be unavailable for ocean applications in 2011 due to budget limitations and clear priority of the mission for cryosphere studies.
Cryosat2, an opportunity for MyOcean
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
• Altika (India, launch planed not before end of 2011) data are crucial to maintain the level of accuracy of the NRT products (3 altimeters is the minimum to resolve mesoscale in NRT)
• HY2 (China, mid-2011): but no data before mid-2012, no information about the data policy (probability that the data will not be available)
• Sentinel-3 (end of 2013): but no data during the first 18 month of the mission.
• Jason-3 (end of2013) :
• GOCE : will indirectely allow to provide new Mean Dynamic topography
Altimeter observing system status
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
R&D and CalVal activities
Development of the regional productsArctic product (CLS/DTU)West shelves product (CLS/LEGOS)
TAPAS initiative : Tailored products for assimilation
Improvement of altimetry processing and validationsynergy with in-situ data
multimission processing delay due to not enough confidence on the stability at long term
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
TAPAS: New generation of along track product
The TAPAS « Tailored Altimeter Products for data Assimilation Systems » initiative was launched in April, 2010 through a workshop gathering the MyOcean MFCs assimilation teams and the SL TAC.
During these 2 days, fruitful exchanges about the contents of the standard altimeter products, their resolution (filtering) and sub-sampling as well as HF atmospherical corrections led to a consensus on several DT altimeter dataset to be tested in assimilation systems.
Two along-track test datasets based on Delayed-Time products were decided and delivered in 2010 on global ocean:
• Version-1 with no filtering, nor sub-sampling (1993-2009)• Version-2 similar to version-1 but with Long-Wave-Errors Correction, Tide
correction and DAC provided (2008-2009)
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
TAPAS V1: higher-resolution
SLA along Track 163cycle 221 -Jason1
TAPAS V1CLASSIC
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Good start with the workshop but difficulties to maintain the energy and the will to work on this transversal R&D activities
Need to have a clear and common work plan To be identified for MyOcean2 Objective/wish: to have some results and hopefully specification for an
implementation in MyOcean2
TAPAS status in 2011
MFC TAPAS product
Planning
WP8 - IBIROOS V1V2
Done in 2010, To be reproduced in 2011
WP4 - Global V1 Planned in 2011
WP9 - Med Sea V1 & V2 In 2011 (REALS)
WP10 - Black Sea V1 Best effort (TBC)
WP5 - Arctic V2 Best effort
WP7 - NW Shelves V1 Best effort (TBC)
Marine Core Service
MyOcean AR2 meeting 27-28 april - RomaMyOcean Annual meeting , 27-28 april 2010, Exeter
Context : • Lower data quality (unperfect corrections, no reference missions
(<66°)• Low data coverage (Envisat, ERS and GFO missions only
northward of 66°, no data northward of 82°, Seasonally variable sea ice coverage)
Study has been done to define a regional processing• change in geophysical corrections
- Use of MSS DNSC08 (vs CLS01V1)- Use of TPX07.2 tide model (vs GOT00v2)
• regional estimation of the missionbias
Arctic products
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
A long time series has been generated (1992-2009) - specifications will be used for the NRT implementation
Arctic products
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Stations Results
RMSe (m) Temporal correlation coefficents
1.Ammassalik 0.1749 0.1650
2.Andenes 0.1179 0.6852
3.Honningsvarg 0.1040 0.7256
4.Lerwick 0.1020 0.6111
5.Maloy 0.1178 0.6422
6.Ny-Alesund 0.1044 0.2906
7.Qaqortoq 0.1115 0.4919
8.Reykjavik 0.1040 0.2609
9.Rorvik 0.1241 0.6682
10.Scoresbysund 0.1673 0.4611
11.Stockholm 0.0919 0.8903
12.Vardo 0.1160 0.6959
- Quality Control Arctic Tide gauges used for the QC of the SL TAC products. Comparison on weekly timescales in Difficult Icecovered region.
A lower latitudes high correlation > 0.90 is found for MyOcaen products (excellent)
Arctic products
- Assessed by DTU
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
(IMEDEA)
• JASON-1/2
• Tide gauges SSH corrected by HIRLAM (20 days Filtered
Along-track altimetry (NRT) VS TGGood TG-altimetry agreement (corr >0.8 with J1/J2)...
OPTIMAL INTERPOLATIONSeveral tests (Grid definition, Spatial / temporal correlation scales, error covariances …)
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Comparison wih gliders (IMEDEA)
Very good Glider-altimetry current agreement (corr>0.8)...
… but differences depending on retracking and corrections used (Sensitivity to retracking : 3.2 cm/s rms, to corrections : 2.0 cm/s rms)
CB
Main surface currents
with various retracking with various corrections
ReferencesBouffard et al., JGR 2010.Bouffard et al. Prog. Ocean. submitted.
Objective: • Develop a methodoloy of comparison between
altimetry and Glider for cross validation and mesoscale characterisation
• ENVISAT; JASON-1/2; JASON-1 (new orbit)• Intensive observational program of 14 glider
missions in the Balearic Sea, along altimetric tracks ( July 2007 - June 2010
Results: illustration Jason-2 vs Glider
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Characterisation of mesoscales dynamics
LEGOS regional/coastal altimetry data : • specifically tuned regional dataset, (CTOH/X-track , Roblou et al.,2010]• Period [2004-2005] 4 satellites
- 1- Mesoscale variablity from Wavelet Analysis done on along track data- 2- Spatial evolution of mesoscale dynamics
offshore onshore transition on the properties
Westward increase of observed lengths and amplitudes Eastward increase of climatological Rd and nb. of eddies
Greatest values of Rd in the Bay of Biscay around 45°N
amplitudes
scales
Nb.of eddies
Internal Deformation Radius (Rd). Chelton et al, 1998.
Maps lengthscale limit
60
20
0
50
160
0
110
West Shelves products
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
West Shelves products
1) use of the results of the scale analysis shown in section 1a,
2) the improved data provided by the X-TRACK coastal processing software.
Feasability on fine scale mapping
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Futur work and Challenges
On going activities System/Service/Production: maintenance/evolution/correction, delivery the version 1products
Service: - Priority to the Users support for the migration towards version 1 (include MFCs)
System: - Prepare and implement the Version 2: Arctic and west shelves products
- Continue to be on the desk to optimise the use of the available altimeter missions
R&D:- Improve the coordination within the SLTAC and between TAC and MFC- TAPAS outcome specification for implementation during MyOcean2- Synergy between altimetry and in-situ : comparison and combination (tide gauge)
Risks:- loss of altimeters (ENVISAT, Jason 1)
Marine Core Service
MyOcean AR2 meeting 27-28 april - Roma
Calendar
Past Tapas meeting (april 2010) MyOcean science days Reviews (PCDW, AR) Participation to different meetings(EGU, etc…)
Future Internal SL TAC meeting (june2011, Palma)
Status on the R&D activities and choice of the specificationsfor Arctic and West Shelves NRT implementation
TAPAS meeting (TBC) Acceptance review for version 2 (september 2011)
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