• Benji Baker• Mentor: Michael Schodlok• Division 324• August 20, 2008

ECCO2: Estimating the Circulation and Climate of the Ocean, Phase II

● Problem: How can we estimate the ocean state?

● High Resolution Global-Scale Ocean and Sea-Ice Data Synthesis

Outline

•How we record observations and collect data•Features of the model•Benefits to society•Website improvements•Data visualization•Outlook

Satellites

● TOPEX/Poseidon● JASON● OSTM/JASON-2

In Situ Data from Ocean Instruments

● Argo floats● XBT● CTD● PIRATA● Moorings● As a float ascends, a series of typically 200

pressure, temperature, and salinity measurements are made and stored on board the float. These are transmitted to satellites when the float reaches the surface.

Source: http://www-argo.ucsd.edu/ and the Office of Naval Research

MITgcm● ECCO2 data syntheses are obtained by

least squares fit of a global full-depth-ocean and sea-ice configuration of the Massachusetts Institute of Technology general circulation model (MITgcm) to the available satellite and in-situ data.

● An objective function, also called a cost function, expresses the extent of optimization: J = uTQ-1u + nTR-1n

JPL/ECCO2 Cubed-Sphere Solution

Terminology:● CS510● Grid spacing

What is the difference between ECCO and ECCO2?

● ECCO2 does a better job modeling the sea ice in the Arctic Ocean

● Higher resolution: 18 km

Why should we care?

● Climate forecasting● Fisheries● Oil barges● Coral reefs● Ship routes● Safe sailing

Experiments:

Experiments:

Dependency Tree:

Key Time Series:

Drake Passage Transport● The sverdrup is a unit of

measure of volume transport. It is equivalent to 106 cubic meters per second.

● Recent studies suggest that the water transport in the Gulf Stream steadily increases from 30 Sv in the Florida Current to a maximum of 150 Sv at 55°W longitude. The entire global input of fresh water from rivers to the ocean is equal to about 1 sverdrup.

● Mild climate of north-western Europe

Florida Strait Transport● The sverdrup is a unit of

measure of volume transport. It is equivalent to 106 cubic meters per second.

● Recent studies suggest that the water transport in the Gulf Stream steadily increases from 30 Sv in the Florida Current to a maximum of 150 Sv at 55°W longitude. The entire global input of fresh water from rivers to the ocean is equal to about 1 sverdrup.

● Mild climate of north-western Europe

MGPLOT GUI

MGPLOT GUI

MGPLOT GUI

MGPLOT GUI

Climate Change

Summary of Results and Outlook

● Easier, expanded data access!● Streamlined sensitivity experiments layout● Room for growth as the ECCO2 project progresses

(key time series, project highlights, ...)

Acknowledgements

● My mentors, Michael Schodlok and Dimitris Menemenlis

● JPL Education Office● SURF funding