In this scenario, deep water would form when salinities at low latitudes became quite high. Explain how this mode of deep water formation could effect the oceans oxygen budget. You may assume that the water overlying the ocean bottom sediments contains normal amounts of dissolved O2, ca. 200 m molar. Your sketch need not include exact numbers, but should show the correct relative distribution of each species.
Many marine plankton are calcifying, i.e. they manufacture calcium carbonate shells.
Knowing what you do about the solubility of calcite, the CO2 system, and the function of photosynthesis, describe how photosynthesis can affect the manufacture of calcium carbonate shell material. Consider the seasonal cycles in atmospheric CO2 levels. Cite your evidence.