EVPP 108 Lecture Notes - Lecture 1: Nitrogen Cycle, Hydrogen Sulfide, Phytoplankton
19 Aug 2016
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Document Summary
Carbon cycle (based on rate of transfer: daily cycle: for photosynthesis plant use lot of co during day, during night respiration. So the co concentration in the atmosphere changes. 2: cycles requiring years, decades or centuries: large quantity of carbon is converted in to plant tissue, leaves, branches, wood. When the plant or tree die these decompose and broken down to co and water. 2: cycles of 1,00,000 years or more: the largest amount of carbon (71 %), dissolved in ocean exchanges slowly with atmosphere, cycles involving millions years, organic matter: due to incomplete decay organic matter accumulates. This occurs in the peaty layers of bogs and marshes, or on the ocean floor. Inorganic matter: carbonate rocks such as limestone are formed when dissolved co. 2 reacts with certain minerals (ca, mg etc. Quantity of carbon is measured in gigatonnes per year. One gigatonne (gt) = one petagram (pg) = 1015 grams = 1 cubic kilometer of water.
