MEOPAR Relocatable Ocean Modeling:

Strategy, Status, Progress

Youyu Lu

With inputs from

Keith Thompson, Hal Ritchie

Collaborators in MEOPAR, CONCEPTS

& Mercator-Ocean

Elements of a Relocatable Ocean Model

• Domain definition

• Grid creation

• Bathymetry

• Surface forcing

• Lateral boundary condition

• Code adjustment & compile

• Model parameters

• Running, validation, analysis, product

Strategy• Closely coordinate/collaborate with CONCEPTS

- Adopt CONCEPTS releases of NEMO code (1.1.0, 2.0.0 soon)

- Assemble model preparation/analysis software

developed/cumulated over a decade through GOAPP,

CONCEPTS, etc.

- Tests high-resolution regional models (& study)

- Automate software for relocatable capability

• Collaborate with Mercator-Ocean

• Collaborate within MEOPAR: 1.1, 1.2 & Prediction Core, sharing

resources

Project 1.1 A Relocatable Coupled Atmosphere-Ocean Prediction System

Project 1.2 Building a Network of Fixed Coastal Observing and Forecast Systems

Project 2.1 Climate Change and Extreme Events in the Marine Environment

Project 2.2 Biogeochemical Projections Under a Changing Climate

Prediction Core

Observation Core

Ocean Modelling Components in MEOPAR

Collaboration with Mercator-Ocean

• MERCATOR relocatable model:

- Leader in region NEMO code development (e.g., OBC)

- Java interface, high level automation

- Inflexibility grids – only follow ORCA

• MEOPAR different & complimentary aspects:

- Flexible grids, bathymetry from Canadian sources

- Canadian atmosphere-Ocean forcing (GEM & CONCEPTS)

- Lower level automation

• Co-development and sharing agreed

Status: NEMO Team in CONCEPTS

Model developers & users:

F. Roy (code keeper), F. Dupont, Y. Lu, L. Zhai, M. Casey

Data assimilation:

G. Smith, Y. Liu, Z. He

Validation & Product

F. Davidson, S. Higginson, J. Xu

Status: NEMO Applications in Canada

CONCEPTS

EC, DFOAcademics

Dalhousie, U Alberta, MUN, UQAR, U Manitoba, UBC, …

Climate Groups

CCCma, UQAM, …

Status: Existing NEMO ConfigurationsGlobal:

• 1/4° for operational ocean & coupled weather-ocean forecasting

• 1° for coupled seasonal forecasting Regional:

• CREG (Arctic + N Atlantic, plan to include N Pacific) 1/12°, 1/4°

• Newfoundland shelf 1/36°

• Gulf of St Lawrence, 5 km, plan 1 km

• Great Lakes, 2 km, plan 1 km

• Strait of Georgia, 0.5 km

Relocatable capability applied to the Strait of Georgia

Curvilinear grid definition using Seagrid*Grid definition using AGRIF

AGRIF refinement- conserve the ORCA grid orientation

One out of 10 grid

point is showed

Grid size: 898x398

Resolution ~450m

Example: Grid Generation

Follow ORCA grid

Create curvilinear grid using Seagrid*

Example: Use of in situ Observed Bathymetry Uncertainty in Hudson Bay/Strait

NABD NABD – ETOPO1

Diff in M2 magnitude

Improve M2 Tide Solution by Refining Bathymetry

CREG12 solution (T1)

Example: High-Resolution Regional Modelling

• Newfound Shelf, 1/36° lat/lon (~2.5 km), 50 vertical levels

• Take initial and boundary conditions from CREG12, GEM atmospheric forcing

• Work started in April 2013 (L. Zhai)

• Solved a puzzle in setting lateral viscosity

• Stared validation & analysis

• Animation of SSH

Progress & Plan

• Prediction Core PDF, J-P Paquin, started may 2013:

- Learned NEMO CONCEPTS v1.1.0

- Grid generation with Seagrid

- Improved documents for model preparation

- Created 0.5 km Strait of Georgia model and tested simulation of tides

- Package transferred to UBC

• Plan: Automate software packages for “relocatable model” development by PDF F. Chegini, expected to start in early 2014.