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ENSC 1005 (9)
Lecture

ENSC 1005 Lecture Notes - Carbon Tetrachloride, Global Warming, Bromomethane

2 Pages
99 Views
Winter 2013

Department
Child and Family Studies
Course Code
ENSC 1005
Professor
Heather Kaye

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Monday January 14, 2013
Climate Change & Ozone Depletion
Climate Change
- The troposphere is the region of the atmosphere involved
- Temperature and climate have been changing throughout the Earth’s history
- Geologic records and atmospheric measurements provide information about
past atmospheric temperatures and climate
- Certain gases in the atmosphere absorb heat and warm the lower
atmosphere, this is the Earth’s Natural Greenhouse Effect
o the energy from the sun warms the Earth’s surface -> infrared energy
radiates back toward space -> clouds, water vapor, CO2, and other
gases in lower troposphere are heated -> when they absorb outgoing
energy these greenhouse gases radiate infrared energy in all
directions and some warms the troposphere and Earth’s surface
- The two major greenhouse gases are CO2 and water vapor
Climate Change and Human Activities
- Humans have increased concentrations of greenhouse gases in the
troposphere by:
1) Burning fossil fuels (releases large amounts of CO2 & CH4 into atmosphere)
2) Clearing and burning forests and grasslands (release CO2 & N2O)
3) Raising large numbers of livestock like cattle (release CH4 in digestive
process)
4) Planting rice and using inorganic fertilizers (release N2O into atmosphere)
Global warming temperature increases in the troposphere, which can cause
climate change
Global climate change changes in any aspects of the Earth’s climate, including
temperature, precipitation & storm intensity that can involve global warming or
cooling
- The world’s floating ice and land-based glaciers are slowly melting which reflects
less incoming sunlight back into space and helps warm the troposphere even more
- Complex mathematical models of the Earth’s climate systems have been developed
that are used to project future changes in the Earth’s average temperature
Possible Effects of a Warmer World
- A warmer troposphere would have beneficial and harmful effects (See FIG. 21.14)
but poor nations in the tropics would suffer the most

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Description
Monday January 14, 2013 Climate Change & Ozone Depletion Climate Change - The troposphere is the region of the atmosphere involved - Temperature and climate have been changing throughout the Earth’s history - Geologic records and atmospheric measurements provide information about past atmospheric temperatures and climate - Certain gases in the atmosphere absorb heat and warm the lower atmosphere, this is the Earth’s Natural Greenhouse Effect o the energy from the sun warms the Earth’s surface -> infrared energy radiates back toward space -> clouds, water vapor, CO2, and other gases in lower troposphere are heated -> when they absorb outgoing energy these greenhouse gases radiate infrared energy in all directions and some warms the troposphere and Earth’s surface - The two major greenhouse gases are CO2 and water vapor Climate Change and Human Activities - Humans have increased concentrations of greenhouse gases in the troposphere by: 1) Burning fossil fuels (releases large amounts of CO & 2H into4atmosphere) 2) Clearing and burning forests and grasslands (release CO & N 2) 2 3) Raising large numbers of livestock like cattle (release CH in4digestive process) 4) Planting rice and using inorganic fertilizers (release N O2into atmosphere) Global warming – temperature increases in the troposphere, which can cause climate change Global climate change – changes in any aspects of the Earth’s climate, including temperature, precipitation & storm intensity that can involve global warming or cooling - The world’s floating ice and land-based glaciers are slowly melting which reflects less incoming sunlight back into space and helps warm the troposphere even more - Complex mathematical models of the Earth’s climate systems have been developed that are used to project future changes in the Earth’s average temperature Possibl
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