Unit 5b Physics Unit 9 Study Guide

3641 Words15 Pages
Unit 5B: The earth, atmosphere , and ocean circulation – April 7 The Earth's rotation • earth has a diameter of 12756 km at the equator • mass ~ 6 x 10^24 kg • The earth rotating cause it to bulge slightly at the equator and flatten slightly at the poles, resulting in an oblate ellipsoid Fig. Oblate ellipsoid • earth's axis : an imaginary straight line through the centre • poles: the 2 points where the axis of rotation intersects the earth's surface • direction of earth's rotation : • looking down from outer space at the North Pole, earth rotates counterclockwise (CCW) 3 implications of rotation : 1) it causes a daily/diurnal rhythm for daylight, air temperature, air humidity and air motion • organisms then respond to this ; creates…show more content…
Prevailing wind from Africa transports dust towards south America and Europe • therefore pollution drift is an international concern • local and regional landscapes: • mountain / hills act as barriers to air movement therefore can impact pollution drift direction • eg. Hawaii/Iceland produce a lot of volcanic pollution (2200 Tonnes of SO2 pro duced a day during volcanic Eurptions ) • acid rain and volcanic smog (= vog) result • temperature inversion: • occurs when the normal lapse rate reverses due to pollution • the warm air inversion traps the cooler (denser) air beneath, trapping the pollution • inversion layer is visible in the morning in valley…show more content…
Lat. at the tropopause along the polar front • it follows the edges if RWs • it marks the location of the strongest temp. contrasts b/w polar & subtropical latitudes • strongest during the winter; weakest during the summer b/c equator-pole temp. • blows EASTWARD • speeds are up to 125 m/sec (used by aircraft flying eastward) B) subtropical jet stream: occurs a the tropopause just above the SHPBs •blows eastward •can occur simultaneously with the polar jet stream •speeds up to 110m/ sec fig. Jet streams C) Tropical easterly jet stream •blows westward •located to the N. Hemisphere over south east Asia INDIA africa and occurs only in summer OCEAN CURRENTS ocean current : any persistent, mostly horizontal heat flow •act and crosschanges heat b/w low and high lats therefore sustain the global energy balance Surface currents • direction is driven by prevailling winds • due to Coriolis force, Water drift is deflected by ~45 degrees • warm water is driven poleward; cold water is driven equatorward Gyres: large circular ocean current systems centered upon the oceanic subtropical high pressure (20-30 N and S) •CW in the N. HEM •CCW in the S.
Open Document