Class Notes (806,429)
Canada (492,247)
Biology (2,220)
BIO120H1 (1,171)
Jon Abbatt (10)

lecture 1 notes from prof. Thomson

4 Pages
Unlock Document

University of Toronto St. George
Jon Abbatt

BIO120 Lecture 1: Distributional aspects of biodiversity Distribution of solar energy:  Since the equator is tilted 23.5˚ with respect to the path the follows in its orbit around the sun, therefore: o At higher latitude, light strikes at a lower angle, and is spread over a greater area. At the equator, the sun shines almost perpendicular on earth’s surface.(Figure 4.1) o In Northern Hemisphere, seasonal variation in temperature increases significantly (less ocean to moderate temperature change.  Ex: at 60˚N, the average coldest month is -12˚C and the average warmest month is 16˚C, differ by 28˚C. (Figure 4.3) o The tropic of Cancer and the Tropic of Capricorn are two lines where the sun is directly overhead at noon on the two solstices. o Tropic of Cancer: lie at 23.5˚ North of the equator (sun is directly overhead at June 21) o Tropic of Capricorn: located 23.5˚ South of the equator( sun is directly overhead at December 21) Precipitation:  Warming air cools down as it rises, as it cools down its ability to hold water vapor decreases  heavy rain.  As the cool air continues to expand and replaced from below by surface-level air moving in. this type of circulation pattern is called Hadley circulation. The Coriolis Effect and jet streams:  Coriolis effect: the effect of the earth’s rotation on the circulation patterns of the atmosphere and oceans, which causes winds and currents to veer to the right of their direction of travel in the Northern Hemisphere and to the left in the Southern Hemisphere.  Jet Stream: A rapidly moving west-to-east air current that forms at the high altitude junction of 2 atmospheric circulation cells (Hadley and Ferrel cells).  Coupled cells + Coriolis effect = prevailing wind patterns The intertropical convergence:  Intertropical convergence: The region where surface currents of air from the northern and southern subtropics meet near the equator and begin to rise under the warming influence of the sun  As air cools down and moves away from the intertropical convergence, it becomes denser and begins to sinkcreated a high atmospheric pressure, dry descending air masses. This area is called the subtropical high-pressure belts.  Because the earth is tilted, Intertropical Convergence Zone shifts seasonally, producing
More Less

Related notes for BIO120H1

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.