ENV100Y5 Lecture : ENV100 - Marine, Coastal Systems & Fisheries- Lecture Notes.docx
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ENV100Y5 Full Course Notes
Verified Note
69 documents
Document Summary
Lectures #37, 38 & 39 - marine & coastal systems & fisheries (contd in jan 22) Blue planet: water makes up 71% the of earth"s surface, mean depth ~ 3. 8 km (absolute darkness, oceans (deepwater ecosystems) are extremely poorly studied, nasa"s budget exceeds noaa"s by 1,600x. Organisms (ex: fish) that breathe in the water extract dissolved oxygen gas = they are not breaking down the water chemically to access oxygen. Ocean water is vertically structured: vertical variation in: temperature (thermocline) salinity (halocline) density (pycnocline) cline = zone of rapid transition/ abrupt change, oceans are very dynamic, temperature declines with depth. Image: 80% of the volume of the ocean is really cold. Organisms living in the deep zone will be different than the ones living in the transitional & surface zone. Surface water heated by solar energy; colder, saltier water is denser and sinks. The ocean has several layers: temperature strati cation varies with latitude.
