LIFESCI 7B Chapter Notes - Chapter 8: Northern Hemisphere, Carbon Cycle, Parental Investment
4 Sep 2018
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Document Summary
In mauna loa, the amount of co2 varied from spring to fall. Summertime removal of co2 doesn"t balance with winter increase, so amount of atmospheric co2 has been increasing. Co2 is added to the atmosphere by: geologic inputs (volcanoes, mid- ocean ridges), biological inputs (respiration), and human activities (deforestation and burning of fossil fuels) Removal by: geologic removal (chemical weather where co2 in rainwater reacts with rocks), biological removal (photosynthesis) Role of photosynthesis and respiration in short-term carbon cycling. Photosynthesis removes about 25% of total co2 in atmosphere (60% done by land plants) The amount of co2 returned to the atmosphere by aerobic respiration is about equal to the amount that plants and algae remove by photosynthesis. Regular oscillation of co2 re ects seasonality of photosynthesis in northern. Photosynthesis is seasonal--higher rates in summer, lower in winter. Respiration is somewhat constant: more land (more plants) in northern hemisphere than southern hemisphere. Global co2 declines in northern summer (bc more photosynthesis)
