Fig. 2. Redox profiles and bottom water characteristics for upper 300 m of the ocean from 10 to 100 percent PAL for tropical locales. Boundary of sulfidic water at --1 mL/L: (A) Non-glacial global climate with the main pycnocline/thermocline from 100 to 3000 m and w/A = 0.3 X 10^-5/cm; (B) glacial global climate with the main pycnocline/thermocline from 100 to 1000 m and w/A = 1.1 X 10^-5/cm.