Chapter 14

Chapter 14 - Ch.14: Biological Productivity and Energy...

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Unformatted text preview: Ch.14: Biological Productivity and Energy Transfer Primary productivity amount of carbon fixed (reduced to organic matter) by organisms through photosynthesis or chemosynthesis. Photosynthesis process of using solar energy to reduce inorganic carbon to organic carbon Chemosynthesis = process of using a chemical compound (hydrogen sulfide, methane, etc) as the electron donor to reduce inorganic carbon to organic carbon Net Primary Production = Gross Primary Production Respiration (by algae) New Primary Production = growth from nutrients brought from outside the ecosystem; Regenerated growth from recycled nutrients One way to measure Primary Production is to use Plankton nets towed behind boats SeaWiFS Sea-viewing Wide Field-of-View Sensor (satellite that estimates chlorophyll cover and thus primary productivity from the SeaWiFS Sea-viewing Wide Field-of-View Sensor (satellite that estimates chlorophyll cover and thus primary productivity from the color of the sea surface, as measured with a radiometer. Marine populations reach their greatest concentrations where nutrients are greatest. Nutrients are greatest along the coast, especially P and N, as these are weathered from the continents and enter the oceans via rivers. The high concentration of nutrients and sunlight penetrating the entire water column along the coast results in the concentration of marine life along the coast. Primary production is always limited by the least abundant nutrient, relative to what is required. Usually, this is Fe, P, or N. Compensation depth for photosynthesis depth where net primary production = zero (respiration = photosynthesis); ~100 m in the open ocean; 20 m along the coast. Distribution of primary upwelling zones around the globe. Upwelling along western boundaries of currents pulls nutrient-rich bottom water up? Why is the bottom water nutrient-rich? Why is upwelling strongest along the western boundaries of continents? SeaWiFS image of chlorophyll concentrations along the southwest coast of Africa, driven by coastal upwelling of nutrients necessary to drive photosynthesis. My is chlorophyll used a proxy for primary production? Electromagnetic spectrum: the full range of radiation emitted by the sun: short wave (left); long wave (right)....
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This note was uploaded on 03/22/2009 for the course GEOL 103 taught by Professor Dr.ries during the Fall '08 term at UNC.

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Chapter 14 - Ch.14: Biological Productivity and Energy...

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