How Glaciations Increased Productions Near Antarctica?
		q The deep-ocean circulation in the Antarctica brings abundant nutrients up into the surface water, which is not fully utilized by photosynthesis due to the brief summer seasons. q During glacial intervals in the Antarctic region, increased carbon pumping out of surface water could occur either because       (1) nutrient-rich waters remained at the surface longer, or       (2) higher glacial nutrient levels stimulated more productivity.