Class Notes (838,386)
Canada (510,872)
EARTHSC 2GG3 (199)
Lecture 15

Earth Science - Lecture 15 Notes.docx

2 Pages
103 Views
Unlock Document

Department
Earth Sciences
Course
EARTHSC 2GG3
Professor
Sergei Basik
Semester
Fall

Description
October 10, 2013 CLIMATIC CYCLES Days to Seasons  Earth’s atmosphere is subject to cyclic changes (seasonal cycles)  Many cyclic changes have impact on weather-related hazards  Heat building during daytime hours can cause afternoon thunderstorms and tornadoes (daily cycle)  Climate controlled hazards are part of seasonal cycles o Hurricanes occur from summer through fall o Tornados occur from spring through summer  The Earth is NOT closer to the sun in summer  Two hemispheres of Earth experience summer at different times  Earth’s axis of rotation is tilted 23.5 degrees to plane of orbit around sun o Northern hemisphere receives maximum solar radiation when the sun points directly at 23.5 degrees (summer solstice) o Warmest temperatures lag behind by about a month (it takes time to heat up land and water) o If there was no angle, both hemispheres would get the same amount of energy from the sun at different latitudes  Other observed cyclic changes in northern hemisphere climate may be explained by: o Changes in ocean currents o Changes in solar radiation caused by changes in Earth’s orbit o Changes in atmospheric composition El Nino  Oceanic circulation in equatorial Pacific usually is pushed westward by trade winds  This cycle happens approximately every six years  Warm surface water off Peru is blown westward and replaced by upwelling of cold, deep, nutrient-rich water  This type of water is very good for fisheries  Every six years (on average), Pacific Ocean circulation reverses in a pattern called El Nino: o The water near Peru is warm o Subtropical trade winds weaken o Air pressure rises in western Pacific o Incessant rain to west coasts of North and South America o Fisheries suffer (there is no cold, nutrient-rich upwelling water)  Differ
More Less

Related notes for EARTHSC 2GG3

Log In


OR

Join OneClass

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

Sign up

Join to view


OR

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.


Submit