Global Hazards pt1-trs and droughts Flashcards
what is atmospheric circulation?
the large-scale movement of air by which heat is distributed on the surface of the Earth.
what is the Hadley cell?
Largest cell which extends from the Equator to between 30° to 40° north & south.
what is the Ferrel cell?
Middle cell where air flows polewards.
what is the polar cell?
Smallest & weakness cell that takes air from the poles to the Ferrel cell.
what is a cell?
circular movements that take air from the equator and move it towards to poles
where do droughts occur?
Drought can occur anywhere throughout the world but they are more frequent between the tropics of Cancer and Capricorn and are more serious there.
what are the 3 main names of tropical revolving storms?
cyclones,hurricanes and typhoons
what is needed to make a tropical revolving storm?
26.5°C, 60m deep and converging winds
what speed is it classed as a trs?
74mph
what is the centre of a storm called?
eye
what are the 4 types of climates
temperate, tropical, polar, desert
what causes high pressure?
cool air sinking. this can cause clear and calm weather
what causes low pressure?
hot air rising. this can cause storms and cloudy weather
what is wind?
wind is the movement of air from an area of high pressure to one of low pressure.
what is the El Nino effect associated with?
dry conditions
what are some managements for droughts?
ban hose pipes, encourage people to use less water, permits to collect water from rivers
what are some managements for storms?
education on preparedness, build safer buildings
what are the steps of precipitation?
1.water vapour is carried by warm air that rises.
2.as it gets higher, the air cools and the water vapour condenses to form a cloud.
3.as water molecule collide and become denser, the water will fall to earth as precipitation.
how fast can jet streams go?
225km/h
what are the 3 types of rainfall?
convectional, frontal, relief
