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Lecture 4

EESA01H3 Lecture Notes - Lecture 4: Methylmercury, Shortwave Radiation, Mercury Cycle


Department
Environmental Science
Course Code
EESA01H3
Professor
Carl Mitchell
Lecture
4

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EESA01 Lecture 4
Eaths Eeg, ate, hdolog
Sep 26 2016
Global Mercury cycle (Hg) cycle:
- 9% of D. Mithells life
- 2 ways of getting out into atmosphere:
o Cinnebar- mulcuric sulfide rock
o Piece of coal
When you mine coal, burn it= mercury in atmosphere
o RESIDENCE TIME: (gashious mercury form= over a year)
Long enough for emissions to travel around the world
- Mercury getting into air thanks to humans
o Larger concentration of it in air than before
From: MINING
Uses= artisanal gold mining
o Take rock with gold (mercury will draw out the gold) (fire the
rock, burn off mercury, left with lovely gold)
Lightbulbs (CFLS)
Pill batteries
Sithes heaie tha ate… a ause oeet
- When mercury gets into wetlands, bacteria eat it up and spit it out into a new form= CH3
(Methyl) mercury (organic form of it)
o Its BIOACCUMULATIVE
Hard to get out of your body
The more you eat= the less time to get rid of it
Biomagnification: food web (mercury traces follow up the chain)
Side effects: lower IQ, motor devlpmt,
Minimata, Japan (methyl mercury) severe birth defects
Tuna makes you cray cray
- Mercury exposure to children (mother to fetus)
- Salle, uikl gos, doest lie log, ot high o food hai= Safe fo eu
- Months- year to flush out mercury in your system (from food exposure)
GLOBAL ENERGY BALANCE AND GLOBAL WATER CYCLE:
- BASICS OF ENERGY AND CLIMATE:
o Warmer things hold more energy than cold (accumulates it)
o Eaths climate is about ENERGY FLUXE & balance bw incoming outgoing
o Recall that energy is transferred
o INSOLATION: Incoming SOLar radiation = shortwave radiation
UV, visible light, near-infrared wavelengths
find more resources at oneclass.com
find more resources at oneclass.com
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