20) Explain the vertical density structure you observed at each ocean 21) Primary production in the ocean Is limited to the auphotic 2one = the layer recelves enough sunlight for photosynthesis, The depth of the auphotic zone vari season and location, from a few meters in coastal waters to 100s of meters in the open ocean. Phytoplankton are drifters and cannot swim against 6cean currents or between strong gradients in density. During which season (summer, fall, etc.) would expect water column stratification to be the most beneficial for phytoplankton in the Nor Atlantic? Explain why. (2 points) - 22) How does global warming affect the density structuring or stratification in the North - S A Atlantic? (1 point) 23) How does this affect global thermohaline circulation? (1 fooila) 24) What are the implications of this on regional climate change? (i.e., what happens when regions usually influenced by warm or cold waters aren't anymore) (1 point) 25) The average sea surface temperature in a region has increased from 28C to 30C over the past decade due to ocean warming. If the seawater density at the initial temperature was 1.025 kg/L and is now 1.023 kg/L, calculate the change in seawater density per degree Celsius of warming in this region. Show your work. (2 points)