1. a Climate, Atmospheric Sciences, and Physical Oceanography, Scripps Institution of Oceanography, La Jolla, CA, 92093-0230
2. b Department of Geography, University of California Los Angeles, Los Angeles, CA, 90095-1524
3. c Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720
4. d CIRES, University of Colorado Boulder, 216 UCB, Boulder, CO, 80309-0216