1. 1Pacific Coastal and Marine Science Center, U.S. Geological Survey, Santa Cruz, California 95060, USA
2. 2Pacific Gas and Electric, 300 Lakeside Drive, Oakland, California 94612, USA
3. 3Department of Earth Science, University of California Santa Barbara, Santa Barbara, California 93106, USA
4. 4Moss Landing Marine Laboratories, Moss Landing, California 95039, USA
5. 5Geosciences and Environmental Change Science Center, U.S. Geological Survey, Denver, Colorado 80225, USA