# Presentation: 756674

## Summary of 22-23 January 2007 ECCO2 meeting

**Summary of 22-23 January 2007 ECCO2 meeting**
*Overview and Motivation*

**ECCO, ECCO-GODAE, ECCO2 (Wunsch, MIT)**
- The only way to understand the complete, global, time-evolving ocean circulation is to use **all** available data and **all** available theory.  ECCOn seeks the best possible estimate of the time-evolving ocean circulation,
- its influence on climate, chemistry, biology, etc., understanding of predictability, and determination of what we do not understand. **A two+ generation problem!**
**ECCO2 and NASA satellite missions (Fu, JPL)**
- Observations of mesoscale and sub-mesoscale ocean variability are a key requirement for understanding regional and global climate processes.  For this reason, wide swath altimetry has been endorsed by the NRC Decadal Survey as a possible new NASA mission.  ECCO2 provides a framework for utilizing high-resolution data from existing and future NASA satellite missions.

- Estimated sea level trend, spatial mean removed (Wunsch, Ponte, and Heimbach, 2007).

- Ground tracks of TOPEX/Jason tandem mission superimposed on satellite imagery of sea surface temperature.

## Summary of 22-23 January 2007 ECCO2 meeting

**Summary of 22-23 January 2007 ECCO2 meeting**
*Assimilation and Modeling*

**Towards an ECCO2 release (Menemenlis/Zhang, JPL)**
- A first least squares minimization of the global-ocean and sea-ice cube sphere (CS510) model resulted in a 64% decrease of cost function wrt temperature and salinity climatologies. These state estimates are already being used in a host of science applications
**Eddy permitting state estimation (Heimbach/Mazloff, MIT)**
- Adjoint method state estimation in the presence of vigorous mesoscale eddy variability has been shown to be possible in a regional, high-resolution, Southern Ocean model configuration.
**ECCO2 high resolution modeling (Hill, MIT)**
- High-resolution global-ocean and sea-ice simulations are being used to estimate error statistics, to experiment with multiscale assimilation, to improve parameterizations of unresolved processes, and to drive the development of petabit/petaflop infrastructure.

## Summary of 22-23 January 2007 ECCO2 meeting

**Summary of 22-23 January 2007 ECCO2 meeting**
*Core Technologies*

**MITgcm model development (Campin, MIT)****Advection schemes (Adcroft, GFDL)**
**Sea-ice modeling  (Menemenlis, JPL)**
**ECCO2 coupled modeling (Hill, MIT)****OpenAD adjoint compiler (Utke, Chicago)****ECCO activities at Harvard (Gebbie, Harvard)****ECCO2 web site (Menemenlis, JPL)****Concurrent visualization (Henze, Ames)**

## Summary of 22-23 January 2007 ECCO2 meeting

**Summary of 22-23 January 2007 ECCO2 meeting**
*Early User Applications*

**Subtropical mode water (Maze, MIT)**
**Eddy propagation velocity (Fu, JPL)**
**GRACE data constraints (Zlotnicki, JPL)**
**Errors estimates (Forget, MIT)**
**Eddy parameterizations (Ferreira, MIT)**
**Arctic freshwater budget (Condron, WHOI)**
**Arctic sea ice budget (Kwok, JPL)**
**Sea ice data/model comparison (Nguyen, JPL)**
**Carbon cycle modeling (Manizza, MIT)**
**Eddy variability in Indian Ocean (Lee, JPL)**
**Darwin project (Hill, MIT)**
**Southern Ocean (Schodlok, JPL)**
**MITgcm assimilation efforts (Cornuelle, SIO)**
**Adjoint assimilation efforts (Edwards, UCSC )**

## Summary of 22-23 January 2007 ECCO2 meeting

**Summary of 22-23 January 2007 ECCO2 meeting**
*Plans for 2007*

- Public release of first ECCO2 solution in Summer 2007.
- Preliminary analyses of ECCO2 solution and sensitivity experiments.
- Development of embedded high-resolution regional models.
- First coupling of ECCO2 with Goddard GEOS-5 atmospheric model.
- High-end visualizations and interactive multi-variate displays.
- Improved ECCO2 web site and distribution capability.
- Model development: Improved grids, hydro-dynamical kernel, representation of sea-ice, ice-shelf processes, stirring and mixing.
- Fall 2007 follow-up meeting at MIT.