Dale HaidvogelInstitute of Marine and Coastal Sciences

Coupled Basin- to Regional-Scale

Ocean Modeling as Developed in the

U.S. GLOBEC Program

Dale Haidvogel

IMCS, Rutgers University

dale@imcs.rutgers.edu

Dale HaidvogelInstitute of Marine and Coastal Sciences

The principal objective of U.S. GLOBEC research is to understand and predict the effects of global climate change on ocean ecosystem dynamics

Dale HaidvogelInstitute of Marine and Coastal Sciences

Approach: Spatially nested biophysical Approach: Spatially nested biophysical modelsmodels

NCEP/MM5 -> ROMS/NPZ -> IBMNCEP/MM5 -> ROMS/NPZ -> IBM

Dale HaidvogelInstitute of Marine and Coastal Sciences

Capabilities developed

1. One- and two-way nesting• NCAR CCSM

• HyCOM

• SODA

2. 4D Variational data assimilation

3. Food web (NPZD) models

4. Individual-based models (zoop, salmon)

Dale HaidvogelInstitute of Marine and Coastal Sciences

Northeast Pacific Program: Spatial windows†

† CCS box contains multiple applications-dependent inner domains

Dale HaidvogelInstitute of Marine and Coastal Sciences

“Reduced” CCS (underway)

• Inner CCS domain (mesoscale survey)

• 2-Km resolution

• 2002

• COAMPS 9 Km forcing

• SODA boundary conditions

• Will include ecosystem model (NPZD+Fe,

NEMURO+Fe)

• Forward runs / data assimilation

Dale HaidvogelInstitute of Marine and Coastal Sciences

Questions and Issues

• How good is the forward model?

• Does it improve upon the reanalysis fields?

• What processes / model details control the errors?

• Use of 4DVar to correct errors

• Redo above for the ecosystems

Dale HaidvogelInstitute of Marine and Coastal Sciences

Dale HaidvogelInstitute of Marine and Coastal Sciences

Dale HaidvogelInstitute of Marine and Coastal Sciences

SODA

Dale HaidvogelInstitute of Marine and Coastal Sciences

Low vertical resolution

Dale HaidvogelInstitute of Marine and Coastal Sciences

Increased resolution of surface layer

Dale HaidvogelInstitute of Marine and Coastal Sciences

Dale HaidvogelInstitute of Marine and Coastal Sciences

Dale HaidvogelInstitute of Marine and Coastal Sciences

Dale HaidvogelInstitute of Marine and Coastal Sciences

Recap

• Significant hindcast skill over several months

• Influence of boundary data, resolution, …

• Errors related to mesoscale evolution of flow?

• Assimilation next (physics first)

Dale HaidvogelInstitute of Marine and Coastal Sciences

Questions?