Homework from last Homework from last class:class:Complete “Layers of the Atmosphere”

worksheet

Complete the Reading Check questions 1-5 on p. 443

Read over class notes and check out the class blog: http://msoonscience.blogspot.com/

Temperature in Earth’s Temperature in Earth’s AtmosphereAtmosphere

WeatherWeatherChapter 10.2 pp. 443-446

What Is Weather?What Is Weather?Weather: the conditions in the atmosphere at a

particular place and time.

◦ “Weather” describes all aspects of the atmosphere and is closely related to the transfer of thermal energy.

◦ Atmospheric pressure, measured with a barometer, is the amount of pressure the molecules in the atmosphere exert at a particular location and time.

Atmospheric pressure is measured in Pascals (Pa) = 1 N/m2

1000 Pa = 1 kPa

pp. 443 - 446

Atmospheric pressure exerts force on you from all directions.

Altitude and Atmospheric Altitude and Atmospheric PressurePressure

As altitude increases, the density of the air decreases the atmospheric pressure also decreases.

When we drive up a mountain or fly in an airplane, our ears “pop” to balance the higher atmospheric pressure in our ear with the lower external atmospheric pressure.

At sea level, atmospheric pressure = 1 kg/cm2,

and as you increase altitude, the pressure drops.

Temperature and Atmospheric Temperature and Atmospheric PressurePressure Warm air is lighter and less dense than cool air and so warm air has a lower

pressure than cool air. The movement of air at different temperatures also affects atmospheric pressure.

pp. 445

warm air cold air =

Atmospheric pressure

decreases

cold air warm air =

Atmospheric pressure increases

Humidity and Atmospheric Humidity and Atmospheric PressurePressureHumidity: measurement of the amount of water

vapour in the air The more humid the air, the lighter it is.

◦ Water vapour is lighter than oxygen and nitrogen in dry air.

◦ Humid air has lower pressure than dry air

• When pressure drops, moist air is arriving in the area.

p. 446

Humidity and Atmospheric Humidity and Atmospheric PressurePressureSpecific humidity: the total amount of water vapour in the

air.Dew point: the temperature where no more water vapour

can be held by airRelative humidity: the percentage of the air that is

currently holding water vapour 73 percent relative humidity means that the air is holding 73

percent of the water vapour it could before reaching its dew point.

p. 446

Meteorology Training!Meteorology Training!Vancouver’s favourite meteorologist, Mark Madryga!

Do you listen to my

weather report but

never understand what

I mean when I say

“high pressure system”

and “prevailing winds”?

Now is your chance to

become a

meteorologist in

training!

Instructions:Instructions:1) You will be divided into 6 groups. Each group will become

experts on a particular type of weather system:

Pressure systemsPrevailing winds and local windsCoriolis effectGlobal wind systemsJet streamsFronts

Take notes using the Weather Systems worksheet provided.

2) As a group, come up with 2 key questions about your weather system.

3) You will be placed into a mixed group of experts. Teach each other the key information about your weather system. Take notes on all the types of weather systems.

4) I will quiz each of you on a type of weather system, so be prepared to answer!

The Coriolis EffectThe Coriolis Effecthttp://www.youtube.com/watch?v=mcPs_OdQOYU

Jet StreamsJet Streams

Flight times:Vancouver to Toronto: 4 hr 20Toronto to Vancouver: 5 hr 01

Extreme Weather ProjectExtreme Weather Project

Homework for next class:Homework for next class: Make a crossword puzzle using the Words to

Know for Ch. 10.2 (p. 436) and other terms in Ch. 10.2

◦ Minimum 10 terms

◦ The best crossword puzzle will be used as a Ch. 10.2 quiz the following class!

Begin working on the Extreme Weather project

◦ Due Thursday, April 27

Read over class notes and check out the class blog: http://msoonscience.blogspot.com/

Works CitedWorks CitedImages taken from the following sources:http://www.fanpop.com/spots/weather/images/250420/title/severe-weather-wallpaper

http://www.abcteach.com/directory/theme_units/weather/weather_clip_art/

http://funlok.com/index.php/humor/airline-announcements-26102009.html

http://myctrring.com/clip-art/body-parts-clip-art/

http://www.clipartheaven.com/show/clipart/outdoor_recreation/hiking_&_climbing/mountain_climbing_01-gif.html

http://www.cnrinch.com/digital-thermometer.htm

http://www2.canada.com/albernivalleytimes/features/livegreen/storyimage.html?id=9ed5c6b1-af56-4c05-b3c4-65e39ac5c8c8&img=6c097be5-6736-4ad1-b522-43ba7a0eb9f4&path=%2Falbernivalleytimes%2Ffeatures%2Flivegreen%2F

http://www.paphosholidays.co.uk/weather-in-paphos