MICR-4010 Lecture Notes - Lecture 13: Mariana Trench, Allochthon, Ultraviolet

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Water takes up 71% of earths surface. Major carbon sink/cycling of nutrients in ocean. Mariana trench = deepest part of ocean (20k meters deep) Photoheterotrophs: use light to gain supplemental energy. Estuarine: where the river and the sea mix. Nitrogen = very limited reagent in ocean. Phosphorus = more limiting reagent in ocean. Proximity to surface = penetration of light and uv. Lower you go in the ocean the more pressure. Practical salinity units (psu) from 0(fresh water)- 35 (open ocean) Types of phototrophs different from top of photic zone v bottom of photic zone. Zone where light can penetrate down to 1% from the surface. Summer - more daylight = more photosynthesis. More light and heat = less dense then colder water causing the warmer water to stay towards the surface. Thermocline: get separation b/w warmer and colder temp. Saltier water stays at bottom v freshwater at top (salt water is more dense)

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