Why do different places experience different weather and climate? Flashcards
Weather
Daily condition of the atmosphere at a particular time and place.
Short-term condition
Changes from place to place all the time
Climate
Average condition of the atmosphere (air) at a specific place over a long period of time, usually over 30 years
Long-term condition
Remains the same for the same region
Elements of Weather
Temperature
Relative Humidity
Clouds
Rainfall
Air-pressure
Wind
Mean
Average
difference between maximum and minimum
Latitude
The distance of any point on the Earth measured north or south form the Equator
Places at higher latitude are colder because they receive a smaller solar angle and lower concentration of solar radiation
Latitude in December
Summer: Southern hemisphere
Winter: Northern hemisphere
Latitude in June
Summer: Northern hemisphere
Winter: Southern hemisphere
Higher latitudes
At higher latitudes, the solar angle (i.e. angle at which the sun’s rays reach the earth) is lower. Thus, solar energy is spread out over a larger area. This results in lower mean annual temperatures.
Lower latitudes
At lower latitudes, the solar angle (i.e. angle at which the sun’s rays reach the earth) is higher. Thus, solar energy is concentrated on a small area. This results in higher mean annual temperatures.
Which regions get high solar angle all year round?
Regions between Tropic of Cancer and Capricorn get a high solar angle all year round.
Altitude
The height of a place in relation to the sea level
Temperature decreases by 6.5°C when altitude increase by 1,000m
Why are places with higher altitude colder?
There is less dense air to absorb heat
It has lesser surface area and is further from the earth’s surface (heat is lost by the time it reaches higher altitude)
There are less greenhouse gases to absorb heat
Cloud cover
The extent of the sky covered by clouds
. More cloud cover reflect more sun rays back to space in the day.
So, days are cooler.
. More cloud cover absorbs more heat at night. So, nights are
warmer
. Therefore, diurnal temperature range is smaller in areas with
more cloud covers.
Distance from Sea (cannot apply to SG)
Sea heats up and cools down slower than on land.
Distance from Sea (cannot apply to SG)
Sea heats up and cools down slower than on land.