gov- clivar workshop, 13 th -17 th june oseval task team workplan gilles larnicol (cls), peter r....

GOV- CLIVAR workshop, 13th-17th June

OSEVal Task Team

WorkPlanGilles Larnicol (CLS) , Peter R. Oke (CSIRO)


Outline

• Introduction- Reminder

• Workplan with the 5 key activities- routine monitoring of the GOOS- delayed mode OSE/OSSE- design of new/future observing system - provision of observation Impact statement - capacity building

Presentation not focused on the description of the main achievements


GOV OSEVal-TT Objectives

• Provide specific requirements for ocean observations (GOOS) to agencies and organisations in charge of global and regional ocean observing systems.

• Maintain and develop international collaboration among the ocean monitoring and forecasting centers organisation of regular meetings and workshops.

• Focused on short range forecasting of the mesoscalebut do not exclude applications related to seasonalforecasting. Links with other communities (as climate) are important to ensure consistency of the requirements


GOV OSEVal-TT organisation

Co-leaders: Peter Oke (CSIRO), Gilles Larnicol (CLS)

Members: Matthew Martin (IV-TT Co-Chair, UKMet); Laurent Bertino (NERSC); Pavel

Sakov (NERSC); Avichal Mehra (NOAA); Yosuke Fujii (JMA/MRI); Gary Brassington (ETOOFS Chair, BoM); Pat Hogan (NRL); Anthony Weaver (CERFACS); Magdalena Balmaseda (ECMWF); Villy Kourafalou (UMiami) ; Daniel Lea (UKMet); Jim Cummings (NRL)

Associate members:

Andreas Schiller (GODAE OceanView Co-Chair, CSIRO); Eric Dombrowsky (GODAE OceanView Co-Chair, Mercator); Eric Lindstrom (OOPC Chair, NASA); Fabrice Hernandez (IV-TT Co-Chair, Mercator)


Work Plan

• 1st GODAE OSEVal-TT meeting (november 2007, Unesco, Paris)

• 2nd GOV OSEVal-TT meeting (June 2009, CLS, Toulouse)

One outcome of the meeting was a first draft of the work plan

• GOVST meeting (Tokyo, Nov 2010)

Work plan has been presented and revised See GOV_Work-Plan-draft-v6.1.3.doc document

5 key activities has been proposed


GOV OSEVal-TT Key tasks

Routine Monitoringof the GOOS


Delayed-mode OSEs and OSSEs

for short-range and seasonal forecast

systems



systems

Design and evaluation of new

and future observation system

components



components

Provision and management of Observation Impact Statements (OIS)

based on OSEval evidence



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Delayed mode OSE/OSSE for short range and seasonal forecast systems

• Objective: Perform in depth OSE/OSSE studies to assess the impact of the different observing systems

altimeter constellation, in-situ (ARGO, drifters, XBT, etc...), high resolution SST

• Aim of this activity is to help to the coordination of the different initiatives through the GOV OSEVal-TT workshop and to provide guidance for the design of the OSE/OSSEs



Guidance identified during the last meeting:• Time period:

Impact of altimeters: 2003- 2006 (4 altimeters)Impact of ARGO: after 2004

mesoscale: 2008seasonal studies: 2004-2008

• Definition of common diagnosticsstrong link with Intercomparison and validaton TT (L4 metrics)

• This kind of studies require a lot of resources (human and computer)if we want a minimum of coordination inside the TT, studies need to be planned



Define priority :• Design and Assessment of a given observing system

which altimeter constellation ? role of specific altimeter mission (ex: Jason-1

interleave,...)

Argo: revisite the 3°x3° sampling, need to have deep Argo floats ?

• Assessment of a given data productL2, L3, L4 for SST, surface topographywhich product to use ? what is the impact of intercalibration/homogeneisation ?



• Magdalena Balmaseda: The new ORA-S4 ECWMF ocean re-analysis

• Yosuke Fujii: OSSE for seasonal/decadal prediction

• Peter Oke: Design and Assessment of the australian integrated Marine Observing system

• Stephanie Guinehut: Combination of in-situ and satellite observations to monitor rhe Global Ocean,State

• Vladimir Stepanov (Keith Haines): The impact of EN3 and RAPID data assimilation on the change of heat balance in the Atlantic

• Andy Moore: Assessing the information content and impact of Observations on Ocean circulation estimated using 4D-Var

• Magdalena Balmaseda: The new ORA-S4 ECWMF ocean re-analysis

• Yosuke Fujii: OSSE for seasonal/decadal prediction

• Peter Oke: Design and Assessment of the australian integrated Marine Observing system

• Stephanie Guinehut: Combination of in-situ and satellite observations to monitor rhe Global Ocean,State

• Vladimir Stepanov (Keith Haines): The impact of EN3 and RAPID data assimilation on the change of heat balance in the Atlantic

• Andy Moore: Assessing the information content and impact of Observations on Ocean circulation estimated using 4D-Var


GOV OSEVal-TT Key tasks





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Design and evaluation of new/future Observing system component

• Similar to the previous task but specific studies dedicated to new and/or future observing systems

• Essentially based on OSSEs- SWOT

• But also OSEs for assessing the impact of very recent data (means with small data set)

- Cryosat-2 - SMOS - Gliders- ...

not in depth studies but crucial

Reactivity needed !!!


Design and evaluation of new/future Observing system component

• Clement Ubelmann: OSSEs to evaluate the impact of future

SWOT assimilated data in regional coastal model

• Gilles Larnicol: New diagnostics to assess the impact of satellite constellation for (sub)mesoscale applications

• Clement Ubelmann: OSSEs to evaluate the impact of future

SWOT assimilated data in regional coastal model

• Gilles Larnicol: New diagnostics to assess the impact of satellite constellation for (sub)mesoscale applications







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• Provide illustrations/arguments/requirements for short term political/technical decision

- contribute to assess the observing system status

- ensure that GODAE needs has been taken into account

where are the gap in Argo coverage ?

what data are looking suspect ? (pb in the Argo pressure

sensor,...) black/grey list

• Better understand how to improve the monitoring and forecasting centers

how can we get more information from observations?better assimilation procedures

Routing Monitoring of the GOOS



• Performance and evaluation of Near-Real-Time OSEs (NRT OSEs) When: what data to with-hold:

Jan 2011 Argo Feb 2011 XBT Mar 2011 TAO Apr 2011 Jason-2 May 2011 All altimeters Jun 2011 AVHRR

• Analysis of Class 4 metrics

The class 4 are generated and will be analysed to quantify the impact of each type of observationsWork jointly pursue with the InterComparison and Validation TT.


How could we perform routine monitoring?

• Conventional Observing System Experiments (OSEs):- Difficulty : expensive to perform routinely

• Routine inter-comparisons of diagnostics:

-The class 4 are generated and will be analysed to quantify the impact of - -each type of observations

Work jointly pursue with the InterComparison and Validation TT

quarterly/monthly/weekly basis (TBD)

• Analysis sensitivity:– Degre of freedom of signal

• Forecast sensitivity– readily applied to adjoint-based assimilation systems

– when we perturb “obs A” how much did the forecast change



• Daniel Lea: Foam Observing system evaluation (OSE) experiments in near real time

• Daniel Lea: Foam Observing system evaluation (OSE) experiments in near real time







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Capacity Building

• OSEVal-TT Workshops

1st GODAE OSEVal-TT meeting (november 2007, Unesco, Paris)2nd GOV OSEVal-TT meeting (June09, CLS, Toulouse)

Report to GOV Science Team1st GOVST meeting Mercator-Ocean, Toulouse2nd GOVST meeting JAMSTEC, Tokyo

Objective: Forum to share results and change and improve the OSEval-TT work plan


Capacity Building

• OSEval-TT website







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Provision of Observations Impact Statement

Ultimate goal of the task team !!

Synthesis of the OSE/OSSEs results in order to provide clear requirements coming from the GODAE community

1. Management of feedbacks from all the membersespecially important in case “observing system events”:continuation and extension of life of Jason-1

ENVISAT new orbit, use of Cryosat-2 ocean data

2. Preparation and formal publications of the OIS OSEs using GODAE systems (Oceanography special issue)

OSE TT community white paper (OceanObs’09)

OSE/OSSE special issue every 3-4 years ?


Provision of Observations Impact Statement

Practical recommendations have to be provided to observation agencies:

What is the process of delivery ? What is Observations Impact Statement ? Recent Experiences (Continuation and EoL of Jason-1, Cryosat-2 ocean

data) show that:- synthetic report preferable than full scientific articles - reactivity is required due to short delay

To be discussed during this meeting (breakout session)

• Peter Oke: Observations Impact Statement • Peter Oke: Observations Impact Statement

gov- clivar workshop, 13 th -17 th june oseval task team workplan gilles larnicol (cls), peter r....

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