The Sea-ice Ocean Coupled Assimilation (SOCA) project at the Joint Center for Satellite Data Assimilation Integration (JCSDA) is working with NOAA and NASA to develop improved marine data assimilation methods for the next generation of seasonal to sub-seasonal prediction systems. This real-time system is being implemented as a testbed for SOCA software development.

For questions or comments please contact: Travis Sluka , Guillaume Vernieres

System Goals

A real-time demonstration of marine data assimilation working within the JEDI framework.

Agile development - ensure up-to-date working code can be released at any time, yet also automatically incorporating the latest changes.

CI/CD Pipeline

With a continuous delivery pipeline, the latest code from all GitHub repositories is automatically tested and run every night, and if successful is tagged as the release/nightly branch. Push to master branch is still performed by a human.

Data Assimilation

An observation-space 3DVAR is used with a multivariate covariance between T/S/SSH (Weaver et al, 2006).

JEDI is used for universal forward operators (UFO), observation I/O database (IODA), variational solvers (OOPS), and static background error representation (SABER)

Configuration

MOM6/SIS2 ocean/ice model from NOAA/GFDL, horizontal resolution of 1 degree, 75 hybrid vertical levels

1 day DA cycle, run nightly with a 48 hr day delay. All changes to code perform a 15 day retrospective reanalysis

Future Work

Upgrade to low-resolution 3DEnVAR / LETKF

High resolution regional Gulf of Mexico domain