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Lecture 9

Lecture 9

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Environmental Science
Tanzina Mohsin

EESA09H WINDLecture 9 NotesWind and Pollutant Transport Wind and Pollutant TransportPart 1 Long range transport of pollutants in the Arctic11Arctic Haze12Persistent Organic Pollutants POPsPart 2 Arctic Pollutant ResearchTorsten MeyerPart 3 Acid Rain in Southern Ontario31What is acid rain32Acid rain precursors33Deposition of acid rain34Acid rain in Southern Ontario Next week ReferencesPart 1 Long range transport of pollutants in the ArcticWe are examining two aspects of Arctic pollutants Arctic haze and persistent organic pollutants POPs11 Arctic Haze111 What is itArctic 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 watersArctic 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 ArcticWhy do the pollutants pool in the Arctic 112 They 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
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