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EESA09H3 (185)
Lecture

Lecture9_notes.pdf

8 Pages
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Department
Environmental Science
Course Code
EESA09H3
Professor
Tanzina Mohsin

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EESA09H WIND Lecture 9 NotesWind and Pollutant Transport Part 1 Long range transport of pollutants in the Arctic 11 Arctic Haze 12 Persistent Organic Pollutants POPs Part 2 Arctic Pollutant ResearchTorsten Meyer Part 3 Acid Rain in Southern Ontario 31 What is acid rain 32 Acid rain precursors 33 Deposition of acid rain 34 Acid rain in Southern Ontario Part 1 Long range transport of pollutants in the Arctic We are examining two aspects of Arctic pollutants Arctic haze and persistent organic pollutants POPs 11 Arctic Haze 111 What is it Arctic haze was first noted in the 1950s by aircraft pilots Since the Arctic was considered a pristine environment this was surprising They noted seasonal variation with the haze peaking in spring Pooling of the pollutants appeared to occur In 1972 Glen Shaw suggested that long range transport was the likely mechanism for the appearance of pollutants in the Arctic Removal of the haze in the Arctic environment is likely via the Arctic Ocean and surrounding waters Arctic haze consists mainly of sulfate 90 and the remainder is largely soot carbon and dust The sulfate levels are 10 to 20 times greater than normal and vanadium has been detected The sulfates are mixed with uncombusted carbon to form aerosols which block light and appear greyish or brownish in colour Coal burning is the major culprit Trace metals such as vanadium and manganese indicate origin of the pollutants Trace constituents such as metals and persistent organic pollutants POPs can adhere to the aerosols and pool in the Arctic 112 Why do the pollutants pool in the ArcticThey pool because of a stable atmosphere due to a persistent temperature inversion particularly in the winterThe ground near the poles is quite cold in the winter due to lack of sunlight this means that temperatures do not decrease with height as sharply as in other regionsOften the temperature may actually increase with height this is called a temperature inversionAll of these prevents air from rising and so inhibits mixing and also precipitation which would otherwise wash out the haze
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