6. Future Change in Research Plans

We plan to focus efforts to understand the effect of ocean mass distribution and currents on continental margins to attempt to quantify the ocean torque effect in the same way that the mountain torques are quantified in atmospheric angular momentum studies. We also plan to place emphasis on studies of the hydrological cycle with special attention given to quantifying the influence of the hydrological cycle (precipitation, evaporation, and runoff) and the effect of coupled climate (ocean-land-atmosphere) model on the calculations of overall angular momentum. To this end, Dr. Jay Famiglietti has been added to the team. He has previous experience in modeling the hydrologic cycle and will be a key member for this effort. He will provide a close link to the global hydrology model work of Schubert. Further effort will be expended to develop techniques for assimilating satellite altimeter data into general ocean circulation models. Finally, attention will be given to the center of mass time series in an attempt to determine which factors influence the temporal variations of these quantities. These topics are being considered at present, but will receive increased attention during the subsequent contract period.

At the present time, no major change is foreseen in the requirements for our staff expertise or equipment or EOS data sets and software. We do note the need for integrating working oceanographers into the group, and to that extent, we have involved the collaborative arrangement with R. Stewart in the Department of Oceanography at Texas A&M University.

7. Conclusions

This report represents a summary description of the progress to date of our EOS interdisciplinary investigation. In particular, scientific, educational, and policy relevant contributions of our investigation have been described. The major scientific findings to date and the anticipated results from this investigation will contribute to a number of scientific objectives and priorities for NASA's MTPE/EOS Program. In particular, current space geodetic measurements of mass and Earth rotation variations are able to provide critical constraints to achieve the investigation objectives to understand their roles in the overall Earth system dynamics. Our investigation will contribute to the understanding of the role of mass and angular momentum exchange within the Earth system. This understanding will allow improvement of coupled ocean-atmosphere-hydrological GCM to enhance climate pattern predictions. The effect of human-induced global warming phenomena is being studied by observing and modeling global sea level variations. Our educational contributions include collaborating and establishment of outreach programs and working with local educational programs