ENV100Y5 Lecture Notes - Lecture 10: Atlantic Cod, Geosphere, Sodium Chloride
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ENV100Y5 Full Course Notes
Verified Note
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Document Summary
Eastern canadian and new england fishers have fished cod for generations: long-distance ships, fish-finding technology, and poor management destroyed the fishery, stocks collapsed under canadian management within a couple of decades, even protected stocks are not recovering. Influences climate; teems with biodiversity; provides habitat; facilitates transportation, recreation, and commerce; provides resources, including food and employment; interacts with atmosphere, geosphere, and biosphere. The ocean contains more than water: 96. 5% water, dissolved and particulate salts (e. g. , nacl, nutrients (e. g. , n, p, dissolved gases, oxygen added by plants, bacteria, and exchange with the atmosphere, major reservoir (sink) for atmospheric co2, + life, motile (floating, swimming, sessile (fixed in place) Surface zone: warmed by sunlight, stirred by wind, consistent water density, transitional zone (-cline, temperature decreases rapidly with depth, density increases rapidly with depth, salinity is highest at the surface, deep zone, dense, cold, sluggish water, unaffected by winds, storms, sunlight.
