Droughts

1. Drought in Australia
By: Imogen & Sienna

2. What Are Droughts?
• Droughts are a particular amount of time of below average
precipitation in a significant region, resulting in prolonged
shortages in the water supply, whether atmospheric, surface water
or ground water.
• A drought can last for months, years, or maybe declared after as
few as a fortnight.
• It can have a consequential impact on the ecosystem and agriculture
of the affected region and harm to the local economy.

3. What are Droughts ?
• Annual dry seasons near the equator significantly increase the
chances of a drought developing and subsequent bush fires.
• Periods of heat can notably worsen drought conditions by
hastening evaporation of water vapour.

4. Australia’s droughts 2005 - 2014
4.3
2.5
3.5
4.5
2.4
4.4
1.8
2.8
2 2
3
5
CATEGORY 1 CATEGORY 2 CATEGORY 3 CATEGORY 4
Series 1 Series 2 Series 3

5. Dry Season
• Within the tropics, distinct, wet and dry seasons emerge due to the
movement of the Intertropical Convergence Zone or Monsoon
trough.
• The dry season greatly increases drought occurrence, and is
characterised by its low humidity, with watering holes and rivers
drying up.
• Since water vapour becomes more energetic, with increasing
temperature, more water vapour is required to increase relative
humidity values to one-hundred percent at higher temperatures to
fall to the dew point.

6. Dry Season
• Time frames of warmth quicken the pace of fruit and vegetable
production, increase of evaporation and transpiration from plants,
and worsen drought conditions.
• Because of the lack of water in the plants, bush fires are common.

7. Climatic Changes
• Activities resulting in global climate
change are expected to trigger droughts
with a substantial impact on agriculture
throughout the world, and especially in
developing nations.
• Overall, global warming will result in
increased world rainfall.
Types of
drought
•Meteorological
•Agricultural
•Hydrological
Consequences
•Dust storms
•Famine
•Habitat Damage
•Hunger
•Erosion
•Irrigation
•War
•Wildfires
•Cyanotoxin

8. Climate Change
• Along with drought, in some areas, flooding and erosion will
increase in others.
• Paradoxically, some proposed situations to global warming that
focus on more active techniques, solar radiation management
thought the use of a space sunshade for one, may also carry with
them increase changes of droughts.

9. Global Droughts
• Drought is a common, recurring feature of the climate in most parts
of the world.

10. The End