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1

Temperature Anomaly

is a difference, or irregularity, found by comparing recorded average annual temperatures against the long term annual temperature

2

For each celsius degree of global temperature increase:

- 5-10% changes in precipitation in many regions
- 3-10% increases in amount of rainfall during heaviest precipitation events
- 5-10% changes in flows of streams and rivers
- 25% decreases in extent of Arctic summer sea ice
- 5-15% reduction in crop yields
- 200-400% increases in the area burned by wildfire in some areas of the western United States

3

Heat Wave

is a prolonged period of abnormally high temperatures, usually, but not always, in association with humid weather

4

Heat Stress in Humans

significant proportion of humans live in mid-latitude locations where heat waves will increase

symptoms:

- heat cramps
- heat exhaustion
- heat stroke
- old people and young people have a harder time regulating their average internal temperature

5

Humidity

the presence of water vapour in the air. It is commonly expressed as relative humidity



6

Why is perspiration not as effective a cooling method in humid environments

In humid conditions, the air cannot absorb as much moisture, so perspiration is not as effective a cooling mechanism as in dry environments.

7

Heat is gained by:

absorption of energy

8

Heat is lost by:

emission of energy

9

What is temperature a measure of?

the average energy of motion of molecules in an object

10

Temperature Scales

- Fahrenheit
- Celsius
- Kelvin

11

Absolute zero

The temperature at which atomic and molecular motion in matter completely stops

12

Daily Mean Temperature

- 13°C

13

Monthly Mean Temperature

-15°C

14

The most important influence on temperature variations on Earth:

Insolation

15

Physical influences on Earth's temperature patterns

- insolation
- latitude
- altitude and elevation
- cloud cover
- land–water heating differences

16

Physical Influence of LATITUDE on Earth's temperature patterns:

- insolation is more intense between the tropics than at higher latitudes where the Sun is never directly overhead (at a 90° angle) during the year

- Change of sun angle (declination) and day length throughout the year drive the seasonal effect of latitude on temperature

17

Physical influence of ALTITUDE AND ELEVATION on Earth's Temperature patterns:

- density and temperature within the troposphere decreases with increasing altitude

- as the atmosphere thins, it contains less sensible heat
worldwide

- Mountainous areas experience lower temperatures than do regions nearer sea level, even at same latitudes

18

which way does heat flow?

heat flows from matter at a higher temperature to matter at a lower temperature

19

Altitude

the height of an object or point in relation to sea level or ground level

refers to airborne objects or heights above Earth’s surface.

20

Elevation

usually refers to the height of a point on Earth’s surface above sea level

21

Physical influence of CLOUD COVER on Earth's Temperature patterns:

- clouds affect the earth– atmosphere energy balance (by reflecting and absorbing radiation)

- effects vary with (3) cloud type, height, and density

22

At any given moment, approximately __% of the Earth is covered by clouds

50%

23

What effect does cloud cover have on temperature at night?

- Cloud cover during the night acts as an insulting layer that reradiates long-wave energy back to earth, preventing rapid energy loss to space.

- Raises minimum night-time temperatures

- A moderating effect

24

What effect does cloud cover have on temperature during the day?

Cloud cover during the day reflects insolation, lowering daily maximum temperatures

25

Clouds also reduce _______ ___________ __________ as a result of these moderating effects.

seasonal temperature differences

26

Physical influence of LAND- WATER HEATING DIFFERENCES on Earth's Temperature patterns:

(5)

- Land and Water respond differently to insolation.

- Land and Water absorb and store energy differently.

- Water bodies tend to have more moderate temperature patterns

- Continental interiors have more temperature extremes.

- Land heats and cools faster than water

27

Factors that lead to LAND-WATER HEATING DIFFERENCES include:

(4)

1. Evaporation
2. Transparency
3. Specific Heat
4. Ocean Currents & Sea Surface Temperature

28

How is EVAPORATION a factor in LAND-WATER HEATING differences?

- Evaporation dissipates significant amounts of the energy arriving at the ocean’s surface (much more than over land surfaces)

- as water evaporates, it changes from liquid to vapour, absorbing heat energy in the process and storing it as latent heat

- as surface water evaporates, it absorbs energy from the immediate environment, resulting in a lowering of temperatures

- remember that the water and vapour remains the same temperature through-out the process; the vapour stores the absorbed energy as latent heat.

- Land temperatures are affected less by evaporative cooling than are temperatures over water

29

~ __% of all evaporation on Earth is from the oceans

84%

30

How is TRANSPARENCY a factor in LAND-WATER HEATING differences?

- Soil and water differ in their transmission of light:

- Solid ground is opaque; water is transparent




[[ - Light striking a soil surface does not pass through, but is absorbed, heating the ground surface.

so.... energy is accumulated during times of sunlight exposure and is rapidly lost at night or when shaded

- Light striking a body of water penetrates the surface and passes through.

so.... the distribution of available heat energy occurs over a much greater depth and volume, forming a larger reservoir of energy storage ]]