Document Sample
Chapter-15-Section-2-3-two-column-notes-2g6wyie Powered By Docstoc
					                               Chapter 15 Section 2 & 3 Notes
       15.2 Atmospheric Heating                                        Notes
What is radiation?                               the transfer of energy as electromagnetic waves

What does Earth get enough radiation to         Drive the water cycle and make Earth habitable.
What is conduction?
                                                     the transfer of energy through a material
Thermal conduction is always transferred                           Warm to cold
from ________ to ________ areas.
When is thermal energy transferred to the      When air molecules come into direct contact with
atmosphere?                                    the warm surface of Earth.
What is convection?                             the transfer of thermal energy by the circulation or
                                                            movement of a liquid or gas
As air is heated it becomes less ______                            Dense; rises
and ______.
Cool air is denser so it ______.                                       sinks

What is a convection current?                  cycle of warm air rising and cool air sinking causing a
                                                             circular movement of air
What percent of the radiation that enters
Earth’s atmosphere is absorbed by clouds                           ___70___ %
and the Earth’s Surface?
What is the greenhouse effect?                 the process by which gases in the atmosphere, such
                                               as water vapor and carbon dioxide, absorb thermal
                                               energy and radiate it back to Earth.
What do scientists hypothesize is the                     Increase in greenhouse gases
reason for the global warming trend?
  15.3 Global Winds and Local Winds
What is wind?                                    The movement of air caused by differences in air
Wind moves faster when there is a greater               Greater difference in air pressure
What, generally, causes differences in air                Unequal heating of the Earth
What is a convection cell?                     huge, circular patterns from the poles to the equator

What is a pressure belt?                       bands of high pressure and low pressure found about
                                                               every 30° of latitude
What is the Coriolis effect?                   The apparent curving of the path of winds and ocean
                                                        currents due to the Earth’s rotation

Because of the Coriolis effect, winds in the                        East; West
north tend to curve _______, and winds in
the south tend to curve _______.
What are global winds?
                                                             Patterns of air circulation
What are the polar easterlies?                 wind belts that extend from the poles to 60° latitude
                                                                in both hemispheres
What are the westerlies?                        wind belts found between 30° and 60° latitude in
                                                                  both hemispheres
What are the trade winds?                     the winds that blow from 30° latitude almost to the

What is a jet stream?                        narrow belts of high-speed winds that blow in the
                                             upper troposphere and lower stratosphere

Jet streams do not follow….                             regular paths around the Earth

Jet streams affect the movement of …
Local winds generally move…                     Short distances & can blow from any direction

Sea and Land Breezes
   Day - _________ heats up faster                Land; Water; warmer than the air above the
      than _________. So the air above              ocean.
      land becomes what?
   Night – land ________ faster than              Cools; water; towards the ocean.
      _______, so the wind blows
      towards what?
Mountain and Valley Breezes
   Day – warm air rises where?                    Up the mountain slopes

      Night – cool air moves where?               Down the slopes into the valley

    Finish labeling the diagram below with the appropriate winds: Polar Easterlies,
    Westerlies, Trade Winds.

Shared By: