2.1 Global systems and global governance - 2.1.5.1: Antarctica as a global common Flashcards
What is the size of Antarctica?
14 million square kilometres
How much of the Earth’s ice does Antarctica contain?
90%
How much of the Earth’s freshwater does Antarctica contain?
70%
There is very little available ………… in Antarctica.
water (less than 166mm per year)
What is the average temperature in Antarctica?
-49 degrees Celsius
What is the biodiversity like in Antarctica?
very low - very few species are adapted to the conditions
The Antarctic ecosystem is very ………… .
fragile
What species thrives at the Antarctic Convergence? Why?
microscopic phytoplankton because there is an upwelling of nutrient-rich cold water
How much has the temperature of the west coast of Antarctica increased by in the past five decades?
3 degrees Celsius (one of the fastest temperature rises on Earth)
What affect has warming had on the Antarctic ice sheets?
melting (especially around the Weddell Sea and Ross Sea)
What species of penguin has declined in numbers as a result of ice melting?
Adelie
By how much has the krill population declined since the 1970s? Why?
80% - a consequence of ice melting and the environment changing
By how much have global sea levels increased since the 1990s?
3mm rise per year
What will the rising of sea levels cause?
the edges of the ice sheets will become unstable which will increase the rate of melting
Why does climate change cause ocean acidification around Antarctica?
carbon dioxide in the air reacts with saltwater to form carbonic acid which depletes the amount of calcium carbonate in the water
Why is a lack of calcium carbonate in the sea surrounding Antarctica a problem?
species such as plankton do not have enough calcium carbonate to form their shells
What is the most fished creature in Antarctica?
Antarctic krill
How much krill was fished from the Antarctic in 2013?
200 000 tonnes
What are the impacts of reduced fish and krill populations?
the food chain is affected
What do legal fishing limits aim to do?
keep stocks at a sustainable level
Why is illegal fishing a problem?
it is very difficult to monitor
What was common in the mid-20th century?
whaling
What year were regulations implemented in order to ban all commercial whaling?
1982
Why will the Antarctic whale population take time to recover?
whales are slow breeders
For what reason do countries still kill whales?
for ‘scientific purposes’
There are believed to be a lot of ………… in Antarctica.
minerals
There are large reserves of ………… underneath the Southern Ocean.
oil
So far, there hasn’t been any ………… in Antarctica.
mining
Mining is currently ………… in Antarctica.
banned
Why isn’t Antarctica the ideal place for mining?
it is too far away to transport machinery from any other landmass and the landscape and climate would make mining difficult and expensive
Why might mining not be banned in the future?
increasing demand for minerals and oil as supplies are depleted elsewhere
Tourism increases ………… and ………… to Antarctica.
shipping; air travel
What does shipping and air travel to Antarctica cause?
water and air pollution
What could happen if boats hit icebergs?
fuel spills