1. Department of Hydrology and Atmospheric Sciences University of Arizona Tucson AZ USA
2. Department of Civil, Geological and Environmental Engineering University of Saskatchewan Saskatoon SK Canada
3. Department of Earth and Environmental Science New Mexico Tech Socorro NM USA
4. School of Physics University of Science and Technology of China Hefei China
5. Department of Earth Sciences University of Oxford Oxford UK
6. Now at Woods Hole Oceanographic Institution Falmouth MA USA
7. Department of Geosciences University of Arizona Tucson AZ USA