1. Department of Geological Sciences, John A. and Katherine G. Jackson School of Geosciences; University of Texas at Austin; Austin Texas USA
2. Hydrological Sciences Branch; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Institute for Geophysics, John A. and Katherine G. Jackson School of Geosciences; University of Texas at Austin; Austin Texas USA
4. Department of Earth System Science; University of California; Irvine California USA