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Lecture 1

BIOL 215 Lecture Notes - Lecture 1: Leslie Matrix, Global Change, Bird Migration


Department
Biology (Sci)
Course Code
BIOL 215
Professor
Neil Price
Lecture
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BIO-215- Lecture 25
Professor Neil Price
November 27, 2014
GLOBAL CHANGE
Reminders:
Final exam 3 hour duration
Non-programmable calculators only
Exam composed of 12-14 questions:
Larsson/ de Martino (10 marks ~ roughly one lecture, pre-midterm)
Price (90 marks plus 5 marks bonus question, roughly 1 question per lecture)
Need to know formulas (not the Leslie matrix)
Check mycourses for updates
Summary:
oRelationships between CO2 and Temperature
oGlobal change and global systems (El Nino)
oEcological consequences on global change
Global Change:
Side:
oScientific articles written almost daily on the subject of global change
oExamine the socioeconomic and environmental reports to assess the state of
global climate change
oAnthropogenic greenhouse gases are driven by population growth and
urbanization, and are extremely likely to be the cause of climate change across the
globe
Temperature variation on Earth during the past 18,000 years:
Graph that shows the change in temperature on earth in relation to a long term
average, recorded thousands of years before present
Holocene = last 10,000 years ago
12,000 = the most recent ice age ended
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BIO-215- Lecture 25
Professor Neil Price
November 27, 2014
Temperature has varied greatly
CO2 and temperature change on Earth
Shows how CO2 levels are correlated with the global temperature deviations
(from a value that is measured over 30-40 year period)
Generally, as CO2 increases so does the temperature
Putting small pieces of soot into the atmosphere has a small cooling effect,
explains discrepancies in the graph.
Throughout earth’s history this relationship has been strong
Scientists have drilled holes in to ice caps and analysed the water inside them.
They use a thermostat that is recorded in the ice layers, using the ratio of
H16/H18 in H2O, they can infer what the temperature many thousands of years
ago was
Shows that declining temperature are linked with declining CO2
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BIO-215- Lecture 25
Professor Neil Price
November 27, 2014
Drives home the message of how CO2 is an important factor affecting
temperature on Earth
CO2 and Temperature change are strongly correlated
What is dramatic is the amount of CO2 that is being release into the environment
-> the rate of increase of CO2 is unprecedented, has never been seen before over
the 18,000 years of history
Temperature is also expected to rise
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