Physical Geography: Weather and Climate Chapter 4 Dr. Emily Berndt.
Full Geography Secondary 3 Express- Weather and Climate 2
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Transcript of Full Geography Secondary 3 Express- Weather and Climate 2
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3 Express Pure Geog:Weather and Climate7th March 2012Elements of Weather: Relative Humidity
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2+Concerns of Previous Lessons: Website Can we download the slides?
Yes. www.armanalluwie.blogspot.com
3+Concerns of Previous Lessons:Latitude/ Longitude/ Altitude Latitude / Longitude / Altitude
geographic coordinates used to specify a location in relation to another
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imagine the earth as a sphere
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0°
90° North (+90°)
90° South (-90°)
Latitude
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5+Longitude
0° Prime Meridian
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0°
90° North (+90°)
90° South (-90°)
Latitude
0° Prime Meridian
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7+Altitude
Since the Earth is not flat, we need the third axis to measure elevation (height)
whiteboard
8+Concerns of Previous Lesson:Maritime Effect
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Water Bodies
Concept: Water bodies heats up and cools down slower
Land bodies
S L O W E R
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Concerns of Previous Lesson:Mistakes Cooler Summers
Air over water bodies heat up slowly
Warmer Winters Air over water bodies
lose heat slowly
eg. San Diego
Warmer Summers Air over land bodies
heat up faster
Cooler Winters Air over water bodies
lose heat slowly
Eg. Winnipeg
Coastal Areas Non- Coastal Areas*
*areas deep within the continent
maritime effect continental effect
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Temperature:Distance from the Sea
Cooler Summers Air over water bodies
heat up slowly
Warmer Winters Air over water bodies
lose heat slowly
eg. San Diego
Warmer Summers Air over land bodies
heat up faster
Cooler Winters Air over land bodies
lose heat faster
Eg. Winnipeg
Coastal Areas Non- Coastal Areas*
*areas deep within the continent
maritime effect continental effect
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11+Temperature:Cloud Cover
earth’s surface
temperature rises up quickly
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12+Temperature:Cloud Cover
earth’s surface
heat escapes easily
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13+Temperature:Cloud Cover
earth’s surface
reflects part of theincoming solar radiation
reflects back heatto the ground
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14+Temperature:Cloud Cover
earth’s surface
reflects back heatto the ground
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Temperature:Cloud Cover
More cloud cover Smaller difference in
day and night temperatures
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16+Lesson objectives
By the end of the lesson, we will be able to explain how evaporation, condensation, precipitation
and saturation affect relative humidity
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17+Humidity
amount of water vapour present in the air
places near the equator have high humidity large amount of water vapour in the air
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18+Relative Humidity
proportion of water vapor present in the air, in relation to the maximum amount the air can hold1 at particular temperature
expressed as %
1hold: contain100 -
50 -
25 -
relative humidity = 50 %
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100 -
50 -
25 -
100 -50 -25 -
change in temperature
relative humidity = 50 %
same amount of water vapour
relative humidity= ?
Relative Humidity
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100 - 50 -
change in temperature
same amount of water vapour
relative humidity > 100%
100 -50 -25 -
same amount of water vapour
relative humidity= 100%
beyond saturation point
Relative Humidity
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21+Relative Humidity
http://www.youtube.com/watch?v=CL5cgXwKUXc
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22+Relative Humidity
Recall, what is meant by “saturation”? air is carrying the maximum amount of water vapor it
can hold at that temperature
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23+Relative Humidity:Changes in Holding Capacity
6000
0 sea level
2000
4000
temperature changeswith increasing altitude
m
24+Relative Humidity:Changes in Water Vapour
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land surface large lakes/ oceans
wind directionair parcel
more water vapour
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25+Revisiting The Water Cycle
http://www.youtube.com/watch?v=AQKdkponoZM
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27+Relative Humidity:Precipitation Definition: water falling from the atmosphere onto
the Earth’s surface
form depends on the temperature of the place where it falls
Liquid Freezing Frozen
Drizzle Freezing Drizzle Snow
Rain Freezing Rain Hail
Ice Crystals
precipitation ≠ rain
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28+Relative Humidity:Cloud Formation
http://www.youtube.com/watch?v=SKmLEgUivj4
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29+Relative Humidity:Relation to Cloud Formation In pairs, name the processes shown in the video
Condensation/ Evaporation/ Precipitation/ Saturation
Explain each process and describe how the relative humidity changes at each stage of the process
Submit your worksheets to Mr. Arman
10 minutes
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30+Lesson objectives
Are we able to explain how evaporation, condensation, precipitation
and saturation affect relative humidity?