marine core service my ocean wp 11 sea level thematic assembly center

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


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

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Version 1 Version 2

MyOcean Annual meeting , 27-28 april 2010, Exeter

Marine Core Service


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


Reminder:SL TAC objectives for year 2

Marine Core Service


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


Marine Core Service


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

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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


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 …

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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


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


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


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


• 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


- 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


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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


• 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

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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


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


TAPAS V1: higher-resolution

SLA along Track 163cycle 221 -Jason1

TAPAS V1CLASSIC

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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

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A long time series has been generated (1992-2009) - specifications will be used for the NRT implementation

Arctic products

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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

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(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 …)

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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


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

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West Shelves products

Marine Core Service


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


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


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)

marine core service my ocean wp 11 sea level thematic assembly center

Documents

beginning of myocean

myocean regions n

myocean central system

myocean system pdr

maintenance n service

service organisation

service n address

release of myocean version1