ENV100Y5 Lecture Notes - Lecture 45: Ozone Depletion, Bromine, The Strongest

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13 Feb 2016
Lecture 45 – Ozone Depletion II
-Chlorine circulates around and may cause depletion of certain ozone situations
-When the chlorine atom encounters a molecule (oxygen) rips out the oxygen atom out of the
ozone molecule, leaving behind O2 (molecular oxygen) and the resulting compound is ClO
(Chlorine monoxide)
-Stronger affinity = oxygen
-The strongest area of depletion tends to be centered in the South Pole, because of the Polar
Vortex (a tight circulating system over the pole
-The air in the Polar Vortex in the North Pole isn’t quite as cold as the one in the South Pole
-Styrofoam cups don’t have CFCs anymore
-Halogens turn out to be ozone depleting (notably bromine)
-Ozone depletion allows more radiation to reach the surface and it has occurred over the South
Pole and it’s also been increasing in geographic size and intensity
-Ozone depletion is facilitated by the presence of catalysts (CFCs)
-Experts don’t know the reason for these changes; we don’t have a tool to go back in time and
measure stratospheric ozone; although we have these tools for climate
-All nations of the world has responsibilities to deal with issues that deal with global scopes;
some countries have more capacities to develop than others however - thus, this is a big sticking
point around discussions, such as climate change
-1980 is always used as a baseline for ozone depletion
-Lots of questions are yet to be resolved however on ozone depletion
-Indoor air pollution is also problematic; around the 60s and 70s, people got worried about
energy use and they designed energy efficient buildings
-Sick building syndrome; office buildings may make some people sick (even at schools); people
get headaches and such
-There’s different causes, but mostly it’s because of ventilation
-In the developing world, there’s sources of indoor air pollution, such as that of inefficient stoves
that are used (ex: wood stove)
This can be problematic, as it can cause bronchitis and 1.6 million die each year from
fuelwood burning smoke
Radon is a soil gas that’s natural and that exists from the soil naturally (2nd cause of lung
cancer is radon, following smoking, which is the 1st cause)
-Global change looks at changes that are global extents; it's related to the atmosphere or the
oceans usually
-Synergistic means that one change magnifies the other
-If a chemical is put into the lake and its not harmful, but we put another one and both interact
together to make something harmful for the fish (because they magnifying each other's impact -
this is known as a synergistic example)
-Antarctica would be included as a global common
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