Water and wind
This presentation is the property of its rightful owner.
Sponsored Links
1 / 27

Water and Wind PowerPoint PPT Presentation

  • Uploaded on
  • Presentation posted in: General

Water and Wind. Chapter 22.2. http:// planetgreen.discovery.com/videos/blue-august-acid-in-the-water.html. Objectives. By the end of this section you will be able to… Discuss what happens to water in the troposphere What is air pressure and what is it also known as Explain what causes wind.

Download Presentation

Water and Wind

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Water and wind

Water and Wind

Chapter 22.2




By the end of this section you will be able to…

Discuss what happens to water in the troposphere

What is air pressure and what is it also known as

Explain what causes wind

Key terms

Key Terms

Water cycle, transpiration, precipitation, humidity, dew point, Coriolis effect

Water and wind

Water is continually being moved throughout the troposphere

The water cycle outlines this movement

See page 781 in your book

Water and wind

The sun’s energy strikes the oceans (or any body of water for that matter) allowing them to escape into the air

This process is known as evaporation

Http techalive mtu edu meec module01 transpiration htm


Evaporated water condenses to form precipitation

During transpiration plants lose moisture through their porous leaves

These amounts can be immense a 1Km2 cornfield can transpire 900,000 gallons of water per day

Water and wind

The water in the atmosphere rises until it will cool enough to condense into droplets of liquid water (clouds)

As clouds cool and condense they can sometimes release moisture in the form of precipitation

Water and wind

The Fates of Precipitation

It remains on the ground until it evaporates again

It will flow into a larger body (Stream, sewer, lake, ocean etc.)

It will be absorbed and become groundwater

It can contribute to a snow/ice pack

Water and wind

Air contains different amounts of water vapor

As temperatures drop the ability for air to hold water diminishes (air is drier)

At higher temperatures more water can be held by air (air is moist)

Humidity is the amount of moisture in the air

Water and wind

Relative humidity is a ratio, or a comparison between the amount of water the air can hold and the amount it is currently holding

This is usually given as a percentage

Water and wind

A hygrometer measures relative humidity

Water vapor becomes liquid at its dew point

This is the point at which the rate of condensation equals the rate of evaporation

Water and wind

So why do drops of water form on a cool glass of lemonade during a warm summer day?

Water and wind

Clouds are made up of small water droplets or at higher altitudes, ice crystals

Where clouds form can determine their shape and characteristics

The root words cirrus, stratus, and cumulus are applied to cloud types in order to describe them

Water and wind

Cirrus clouds are thin and wispy and occur at high altitudes

Stratus clouds are layered and look like blankets

Cumulous clouds are white and fluffy and usually have flat bottoms

See page 783


Water and wind

Cloud names can be combined or have a prefix or suffix added to them

The prefix nimbo- or the suffix –nimbus implies that particular cloud will produce precipitation

Water and wind

Mercury barometers indicate air pressure by using a column of mercury (Hg)

This is why atmospheric pressure is sometimes referred to as mm of mercury

Average barometric pressure is around 760 mm of Hg

Pressure can also be measured by the unit atmosphere. 1atm = 760 mm Hg

The pascal (Pa) or torr is also used

Water and wind

Aneroid barometers do not contain liquid

These types of barometers contain a vacuum chamber which will move a lever on a spindle

Why is one better than the other?

Water and wind

What causes wind?

Pressure gradients (or differences) are what causes air to move

Much like the window in your car

Or more dramatically the window of an airplane

What causes pressure gradients on Earth?

The Sun! ….see demo

Water and wind

Wind always moves from areas of high pressure to areas of low pressure

You can see these on weather maps

Isobars are areas of pressure that are the same.

Each line represents an area of consistent pressure

See weather map

Water and wind

Directions of wind are also affected by the Earth’s rotation

The Coriolis effect is the curving of the path of a moving object from an otherwise straight path, because of the Earth’s rotation


Water and wind

So why does the Coriolis effect occur?

Its physics!

Depending where you are located on the Earth will dictate the speed you are traveling (even if you’re standing still)

Someone standing on the equator has to travel faster than someone standing on the north pole (demo?)

Water and wind

The Coriolis effect and isobars can allow us to make predictions on wind and weather patterns

These regions are known as wind belts

Each hemisphere (N&S) have 3

These paths are so predictable we can use them to travel

Water and wind

Homework page 787 1-6

  • Login