ENV100Y5 Lecture Notes - Lecture 15: Marine Pollution, Oceanic Zone, Downwelling

• School: UTM
• Department: Environment
• Course: ENV100Y5
• Professor: Barbara Murck

Document Summary

This will help me understand: chara(cid:272)teristi(cid:272)s of the o(cid:272)ea(cid:374) a(cid:374)d (cid:373)ari(cid:374)e e(cid:374)(cid:448)iro(cid:374)(cid:373)e(cid:374)t, major (cid:373)ari(cid:374)e a(cid:374)d (cid:272)oastal e(cid:272)os(cid:455)ste(cid:373)s, hu(cid:373)a(cid:374) use of (cid:373)ari(cid:374)e resour(cid:272)es, mari(cid:374)e pollutio(cid:374) a(cid:374)d other hu(cid:373)a(cid:374) i(cid:373)pa(cid:272)ts, the state of o(cid:272)ea(cid:374) fisheries, mari(cid:374)e prote(cid:272)ted areas. The o(cid:272)ea(cid:374)s (cid:272)o(cid:448)er (cid:373)ost of earth"s surfa(cid:272)e: i(cid:374)flue(cid:374)(cid:272)es (cid:272)li(cid:373)ate, tee(cid:373)s (cid:449)ith (cid:271)iodi(cid:448)ersit(cid:455); pro(cid:448)ides ha(cid:271)itat; facilitates transportation, recreation and commerce; provides resources, including food and employment, interacts with atmosphere, geosphere and biosphere. Dissolved gasses: oxygen added by plants, bacteria and exchange with the atmosphere, major reservoir (sink) for co2. Ocean temperature more stable than land temperatures. Surface zone: warmed by sunlight, stirred by wind. Transitional zone: temperature decreases rapidly with depth, density increases rapidly with depth. Deep zone 1000m: dense, cold, sluggish water, unaffected by weather. Upwelling = upward flow of cold, deep water. Downwelling = oxygen-rich water sinks where surface currents come together. Surface currents are driven by wind, through friction. Gyres are caused by coriolis force + friction: debris, garbage is accumulated.