when these information is given to predict oxygen concentration. 1) how am i sup
ID: 1146 • Letter: W
Question
when these information is given to predict oxygen concentration.
1) how am i supposed to predict oxygen concentration?
2)when i find out the predict oxygen concentration, comparing predict and observed oxygen concentration date gives what differences?
3) So eventually, what vertically variabl property of the water leads to this profile? and what process sets up the vertical variability in this property?
O2 consumption rate (uM/yr) Surface O2 concentration (uM) 0.15 249.7 Depth (m) Age of water (yrs) Observed oxygen concentration (uM) Predicted oxygen concentration (uM) 5 0 249.7 249.7 15 0.022014 250.5 ? 27.5 0.043221 252.4 ? 45 0.081725 255 ? 65 0.27518 253.3 ? 87.5 1.5697 247.2 ? 117.5 8.7194 232.7 ? 160 29.358 209.8 ? 222.5 79.565 185.2 ? 310 185.75 159.8 ? 435 348.03 123 ? 610 549.45 73.1 ? 847.5 762.4 37.1 ? 1160 958.18 35 ? 1542.5 1114.4 50.5 ? 1975 1223.2 75.9 ? 2450 1278.7 100.8 ? 2950 1282.7 122.6 ? 3450 1244.7 138 ? 3950 1175.3 148.5 ? 4450 1098.9 156.7 ? 4950 1038.6 163.1 ? 5450 1003.4 166.4 ?Explanation / Answer
How does temperature affect dissolved oxygen levels? The solubility of oxygen is greater in colder water than in warm water. Oxygen slips into "pockets" that exist in the loose hydrogen-bonded network of water molecules without forcing them apart. The oxygen is then caged by water molecules, which weakly pin it in place. The dissolution is exothermic overall, so cooling shifts the equilibrium towards the dissolved form
How does oxygen partial pressure affect dissolved oxygen levels? Oxygen in water obeys Henry's law rather well; the solubility is roughly proportional to the partial pressure of oxygen in the air:
pO2 = KO2 xO2
where pO2 is the partial pressure of oxygen in Torr, xO2 is the mole fraction of oxygen in oxygen-saturated water, and KO2 is the Henry's law constant for oxygen in water (about 3.30
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