Factors Influencing the Antarctic
Geography: Cambridge International GCSE (2027 Exams), topic 3.1.2
Factors Influencing the Antarctic Ecosystem:
The Antarctic ecosystem is shaped by extreme cold, limited sunlight, and seasonal changes. Geographical factors like Earth's tilt, latitude, and air pressure affect its harsh climate.
Location and latitude
- The Antarctic ecosystem is located around the South Pole (90°S latitude).
- Antarctica is very far from the equator, so it receives very little solar energy.
Earth’s tilt and seasons
- The Earth is tilted on its axis, which affects how much sunlight Antarctica gets.
- In winter, Antarctica is tilted away from the sun, so it is dark and very cold.
- In summer, Antarctica is tilted towards the sun and gets 24 hours of daylight.
Exposure to the sun and insolation
- Even in summer, the sun stays low in the sky, so insolation (solar energy) is weak.
- Low insolation means less heat reaches the surface, keeping the climate very cold.
Daylight and darkness
- Antarctica experiences long periods of darkness in winter and long daylight in summer.
- These extreme light patterns affect temperatures and limit plant and animal activity.
High-pressure system and effects
- A high-pressure system dominates Antarctica, bringing cold, dry, and calm weather.
- The air is very dry, so precipitation is low, and most of Antarctica is a polar desert.
- These conditions make it hard for life to survive, limiting the Antarctic ecosystem.
Test yourself on Factors Influencing the Antarctic
What is the primary reason Antarctica receives very little solar energy?
What weather conditions does Antarctica's high-pressure system create?