1. School of Engineering University of Newcastle Callaghan NSW Australia
2. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
3. Goddard Earth Sciences Technology and Research Universities Space Research Association Columbia MD USA
4. Global Modeling and Assimilation Office NASA Goddard Space Flight Center Greenbelt MD USA
5. Geodesy and Geophysics Laboratory NASA Goddard Space Flight Center Greenbelt MD USA