Case Study: Antarctica Flashcards
What does Antarctica store?
60% of the worlds fresh water
How does the continent change in winter?
It doubles in size
When was Antarctica discovered?
By 1821, by sealers
When was the heroic exploration of Antarctica?
1895-1922
What is an ice sheet?
Results from small inputs of snow and frost (exceeding ablation rates) over a very long time
What is ablation?
The opposite of accumulation, refers to all processes that remove snow, ice and water from the glacier or snowfield
What is a nunataks?
An exposed, rock element of a ridge, mountain or peak not covered by snow or ice within or at the edge of an ice field or glacier.
Also known as GLACIAL ISLANDS
What is the Antarctic convergence zone?
A natural boundary separating 2 distinct hydrological regions/ areas of distinct climate
Why do Antarctic waters freeze at such low temperatures?
Because they are so salty
What happens at the Antarctic convergence zone?
Warm surface water and cold Antarctic water meet
What is global thermohaline circulation?
When water moves along gradients
How does water have a tendency to move?
From warm to colder areas
How much of the land is ice free?
Less that 5%
what do mean winters range from?
-9 to -68 degrees C
What are claims of Antarctica land founded on?
- Discovery and explorations of areas
- Proximity to Antarctica
- Seeking control of natural resources
When was the Antarctica Treaty created?
1959
How many countries have now signed the treaty?
46
What are the main intentions of the treaty?
-Antarctica shall be used for peaceful purposes only
-Antarctica should be a site of scientific investigation
-No nation would be obligated to surrender its claim, and no new claim could be made
What does the environmental protocol of the treaty state?
- Commits the parties to comprehensive protection of the Antarctic environment
- Designated Antarctica as a natural reserve devoted to peace and science
- Bans all commercial mineral resource activity
- Requires assessment of impacts of any activities
when will the environment protocol be revised?
2048
How many environmental NGOs work in coalition to protect Antarctica?
Over 1000
What 4 human activities threaten Antarctica?
- Scientific research
- Mineral exploitation
- Fisheries + whaling
- Tourism
How many permanent scientific bases exist on Antarctica?
40
How can scientific research threaten the environment?
In 1989, an Argentine ship ran around and released 25,000 gallons of fuel into the sea. Similar events have occurred at Russians and US bases
Where have coal seams been discovered?
Along coastline and in the mountains
Why has activity at coal seams so far been deterred?
It isn’t commercially viable, but may be needed for future demand
Where has a great potential for oil?
The Weddel and Ross seas, on the continental shelf
How many barrels of oil are estimated to be in the Weddel and Ross seas?
50 billion
What is the only large scale exploitation in Antarctica?
Fishing
What are the impacts of fishing in Antarctica?
- Over-fishing of target species
- Effects on species that depend on target species
- Killing of other species accidentally caught
- Destruction of habitat by equipment