🌍 ✅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 exploration of areas
- Proximity to Antarctica
- Seeking control of natural resources
When was the Antarctica Treaty created?
1959, enforced from 1961
How many countries have now signed the treaty?
46
WHat IS the Antarctic Treaty System?
A combination of the Antarctic Treaty and other related systems
- hold anual meetings
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
REGARDED AS MOST SUCCESFUL PIECE OF LEGISLATION
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 human activities threaten Antarctica?
Scientific research
Mineral exploitation
Fisheries + whaling
Tourism
How many permanent scientific bases exist on Antarctica?
40 - means of resources flown or shipped in
How has scientific research threatened 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 bn
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
what is the biggest species of concern in Antarctic fisheries?
Krill
Why are krill such an important species?
they feed on phytoplankton, and are then eaten by a wide range of species
what has declined due to the over fishing of krill?
the decline in some penguin
Why is krill being fished?
It is used to feed salmon farms and their enzymes have pharmaceutical uses
What is CCAMLR?
Commission for the Conservation of Antarctic Marine Living Resources
What do CCAMLR do?
Control the commercial fisheries in the Southern Ocean, taking into account the species being fished and their prey and predator species. They monitor all fishing in the region
What must all vessels in the CCAMLR region participate in?
Monitoring systems to report krill catches
Why are pharmaceutical companies interest in Antarctic species?
For their anti-freeze protein in their blood, and for how fish slow their heartbeat to save energy in cold environments
Who banned whaling in the Antarctic?
the International Whaling Commission
What is the limit of viability?
The amount of meltwater an ice shelf can take before it begins to weaken and retreat
What area does the Antarctic Treaty apply to?
60 degrees south
What does the Treaty not apply to?
the seas
When was the Whaling Moratorium introduced?
1982
How were whales previously hunted?
Using harpoons and specialist whaling boats
What did Greenpeace do for Antarctic whales?
they launched an anti-whaling campaign shortly after the organisation formed, and Greenpeace ships began confronting whaling fleets -demand for whales began to rapidly decrease
Which countries ignore the moratorium?
Japan
Iceland
Norway
How many whales does Japan hunt each year for “research”?
300