How are the levels of carbon dioxide linked to the photic and aphotic zones? How does this relate to

the temperature of the water? What will be an ideal response?


ANS:Answer
should include:

? Carbon dioxide is used by primary producers. It is readily available from the
atmosphere. Primary producers are able to use carbon when converting light energy to
chemical energy. The carbon dioxide in the photic zone gets used fairly quickly.
? Carbon dioxide levels are high in the aphotic zones and low in the photic zones. There is
no photosynthesis occurring in deep waters. This allows carbon dioxide to sink and
accumulate in dark waters.
? Gasses dissolved are able to do so at saturation in colder waters. Deeper waters are able
to hold more carbon dioxide due to the cold temperatures.

Environmental & Atmospheric Sciences

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