www.pol.ac.uk

ECOOP WP2 overview“A community modelling framework”

Jason Holt

For Roger Proctor

ECOOP Consensus and planning meeting

16-17 March 2005

Rational: exploiting diversity

• There is a diversity of modelling approaches in existing systems:– Solving the equations of motion– Imposing forcing/boundary conditions– Representing the ecosystem, sediments….– Data sources/Assimilation schemes– Infrastructure

Hydrodynamic Components of a coastal-model

• Free surface• Resolves the boundary layers• Turbulence closure for multiple boundary layers• Feature preserving advection• Surface fluxes and downwelling irradiation• Scale selective horizontal diffusion• Accurate horizontal pressure calculation with steep topography• Lateral boundary conditions/nesting• Coastal boundary condition - Flooding/drying• etc.

just for hydrodynamics there many model systems: POM, ROMS, MOM, HAMSOM COHERENSE, GETM , POLCOMS….., often with extensive ‘local’ variations

Why model diversity

• No consensus on best practice– Lack of constraints and many arbitrary choices

• Regional variation– Different processes dominant in different regions

(but ideally this should be an emergent property)

• Institutional expertise– Historical– Massive resource

The Challenge

• Develop a community framework of model systems that allows practical integration and exchange of– Model components (compatible with NEMO & MERSEA)

– Scientific/technical developments

• Define common model quality standards:– Accuracy

• Solution

• Conservation (mass, momentum, energy, vorticity…)

• Observations

– Stability

– Efficiency

The Benefits

• Rapid knowledge transfer operational <-> research systems

• Improved model systems

• Shared best practice

• Standards to direct/constrain development

• Traceable model-model-data inter-comparison

• Traceable multi-model ensemble simulations

AIMS AND OBJECTIVES

– Design minimum threshold and standard for ECOOP Ver0

– Upgrade existing forecast systems to this standard

– Establish standards for exchanging software and knowledge

– Establish modelling and data assimilation code library

– Establish library of key research priorities

ECOOP WP2

Task 2.1 Design minimum threshold and standard for ECOOP Ver0This task aims to establish the minimum modelling requirements to address each coastal region’s specific needs. It also will ensure that the standards and protocols adopted in ECOOP conform to, and are complementary to, the NEMO framework.

Task 2.1.1 – evaluate complexity of physical/biogeochemical processes in each region

Task 2.1.2 – evaluate modelling requirements to resolve this complexity, including assessment of computing requirements

Task 2.1.3 – define minimum thresholds (and acceptable error) for accurate simulations

Task 2.1.4 – determine the requirements for data assimilation and establish the appropriate methodology (dep. accuracy and frequency of datasets?)

Task 2.1.5 – specify standards for ECOOP Ver0 to ensure compatibility with MERSEA NEMO framework

Task 2.1.6 – establish forward look group to identify requirements for ECOOP Ver1

ECOOP WP2

ECOOP WP2

Task 2.2 Upgrade existing forecasting systems to reach the minimum thresholdThis module will identify where existing models are deficient and establish procedures for raising standards. It will also define the methodology for multi-model forecasts

Task 2.2.1 – Examine existing forecasting systems and define error statistics

Task 2.2.2 – Identify components of existing systems which fail acceptance criteria

Task 2.2.3 – Implement upgrade procedure

Task 2.2.4 – Design multi-model systems criteria and implementation methodology

Task 2.3 Standards for exchanging software and knowledgeThis module will identify the data requirements for inputs to models, including the exchange (initially one-way, subsequently two-way) between MERSEA regional models and ECOOP coastal models. It will establish the software standards required to ensure module compatibility between models. It will establish the output parameters and formats for model data to ensure consistency and compatibility between models. It will invoke a forum for exchange of ideas and knowledge on coastal processes and modelling techniques to ensure all ECOOP partners have the latest information on ECOOP models, and the latest developments in operational oceanographic models worldwide (interacts strongly with Task 2.6). It is also important for ECOOP to make use of the latest GRID and MIDDLEWARE technology and we will specifically investigate how this will best be utilised to link input, outputs and models (links to WP3 in particular).

Task 2.3.1 – Identify exchange requirements between ECOOP modules and between ECOOP and MERSEA modelsTask 2.3.2 – Develop standards for process module exchangeTask 2.3.3 – Develop protocol for ECOOP-MERSEA exchange (requirements for couplers e.g. PRISM)Task 2.3.4 – Develop protocol for ECOOP nesting exchange Task 2.3.5 – Develop protocol for ECOOP database accessTask 2.3.6 – Establish knowledge transfer forumTask 2.3.7 – Establish transfer protocols for GRID exchange.

ECOOP WP2

Task 2.4 A modelling and data assimilation libraryTo construct and maintain the library of model modules and data assimilation routines required for implementationTask 2.4.1 – Establish online structure for libraryTask 2.4.2 – Construct library of modules and associated documentationTask 2.4.3 – Implement version control system and maintain library

ECOOP WP2

Task 2.5 A library of key research priorities The purpose of this task is to identify the key research priorities for each domain and process (e.g. WFD requirements on eutrophication, nutrient status). Also to identify the modelling components which require the most urgent need of improvement to satisfy prescribed criteria. Outputs from Task 2.6 will contribute to this module. Task 2.5.1 – Establish online structure for libraryTask 2.5.2 – Construct library of priorities for domains and processesTask 2.5.3 – Construct library of priorities for model process improvements

ECOOP WP2

Task 2.6 Expert groups, e.g., in physical, ecosystem, model coupling and data assimilation… To ensure that ECOOP has available the latest, state of the art information on all processes and their interactions in coastal seas and has the capability to model these processes in the most accurate and efficient manner. To ensure ECOOP is aware of, and understands, the necessary legislation and socio-economic considerations for forecasting and operational oceanography in coastal seas. The outputs of these groups are seen as fundamental in prioritising ECOOP developments. Task 2.6.1 – establish expert process groups in modelling physics, biogeochemistry including sediments, ecosystem processes, air-sea interaction; in modelling techniques of data assimilation, boundary conditions, coupling and nesting, data analysis, gis, socio-economic outputs. Task 2.6.2 – establish program of discussion group interaction and online structure for disseminationTask 2.6.3 – produce expert documents prioritising ECOOP requirements for ver0 and ver1

ECOOP WP2