ENV234H1 Study Guide - Midterm Guide: Dissolved Organic Carbon, Epilimnion, Hypolimnion
28 Apr 2016
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40 + 70=110 precipitation water from ocean evaporation and transpiration. 2/3 of this water is used for agriculture. Slow renewal for aquifers is 0. 1-3% per year. In canada, 85% of rural population rely on groundwater. Maximum density is at 4 degrees (sinks); colder and warmer floats. Important for how water freezes: heat capacity (buffers against rapid change, nearly universal solvent, high density, strong surface tension (supports organisms, transparent (photosynthesis) Stratified: warm water on top (less dense) higher on right, moves left then straight. Wind deepens stratification (mixes warm water) straight line for segment, then strong line down to colder line (structure): density changes non-linearly with temperature. 15:11: metalimnion, thermocline: the line of maximum of density change, hypolimion: bottom (most constant) Dimictic lakes (in temperate areas with ice cover) Wind power allows for the mixing of oxygen and nutrients to the bottom and top (turnover) in the spring. Surface water becomes warmer in the summer; thermocline acts as a wall.
