CAS ES 142 Lecture Notes - Lecture 1: Remineralisation Of Teeth, Oxygen Minimum Zone, Photic Zone

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Primary production is a rate (how much is produced (biomass) per unit time) Wanted to increase the amount of food available for humans on earth. Weathering of continents runoff of farm fertilizers. Phytoplankton suck up co2 from the at(cid:373)osphere (cid:894)look at le(cid:272)ture slide titled (cid:862)pri(cid:373)ary produ(cid:272)tio(cid:374) (cid:271)y phytopla(cid:374)kto(cid:374)(cid:863)(cid:895) Organic matter + o2 = co2 + no3 + po4 + h2o: produces inorganic matter also called remineralization, regeneration, or degradation, consumes oxygen, produces carbon dioxide regenerates nutrients. Oxygen concentration on x axis euphotic zone: surface waters, oxygen is produced by photosynthesis respiration is also occurring but at a lesser degree. As it descends in the ocean, carries high concentration of oxygen with it. Lots of deep water circulation: also low rate of respiration in deep water because not a lot to eat. Not consuming oxygen summary of oxygen concentration: highest at surface, decreases after euphotic increases after 1000 m.

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