1. Lawrence Berkeley National Laboratory, Earth and Environmental Sciences Area, Berkeley, California, USA. (corresponding author)
2. Lawrence Berkeley National Laboratory, Earth and Environmental Sciences Area, Berkeley, California, USA.
3. Array Information Technology, Berkeley, California, USA.
4. U.S. Geological Survey, Menlo Park, California, USA.
5. Jarpe Data Solutions Inc., Prescott Valley, Arizona, USA.
6. Calpine Corporation, Middletown, California, USA.