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Lecture 14

SCIE 1P50 Lecture Notes - Lecture 14: Global Warming Potential, Smog, Halocarbon


Department
Science
Course Code
SCIE 1P50
Professor
Caroline Starrs
Lecture
14

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SCIE 1P50 Lecture #14 Monday, October 31st, 2016
Climate Change
Our Dynamic Climate
Climate influences everything around us
o Affects our agriculture
The Fifth Assessment Report of the Intergovernmental Panel on Climate
Change (IPCC) 2014 made it clear that:
o “each of the last three decades has been successively warmer at
the Earth’s surface than any preceding decade since 1850. In the
Northern Hemisphere, 1983-2012 was likely the warmest 30-year
period of the last 1400 years”
o climate change is the fastest-moving area of environmental
science today
Puts together conferences to try & agree on what to do with climate
What is climate change?
Climate = an area’s long term atmosphere conditions
o Temperature, moisture content (how much water is out there), wind,
precipitation (rain, snow, ice), etc.
Weather = conditions at localised sites over hours or days
Global Climate Change = describes trends and variations in Earth’s
climate
o Temperature, precipitation, storm frequency, etc.
Global Warming = an increase in Earth’s average temperature
o Talking about a small amount of change which represents the
worlds average
o Earth’s climate has varied naturally through time
o The rapid climate change taking place now are due to human
activity: fossil fuels, combustion (burning = get carbon dioxide) &
deforestation
The Sun & Atmosphere Keep Earth Warm
Three factors exert more influence on climate than all others:
1. The sun (supplies planet’s energy)
2. The atmosphere (absorb 70% of incoming solar radiation)
3. The oceans (act as a heat sink; shape climate by storing &
transporting heat & moisture)
Greenhouse Gases
Warm the lower atmosphere
As earth’s surface absorbs solar radiation, the surface increases in
temperature & emits infra-red radiation
Greenhouse gases = atmospheric gases that absorb infrared radiation
find more resources at oneclass.com
find more resources at oneclass.com
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