Oceans in need: Increased carbon dioxide concentration threatens the water world.

Tuesday, November 17th, 2009 at 16:15

Tagged with: carbon • oceans

Filed under: Biologie • Environment

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Acid ocean dissolves shellfish

The increase of carbon dioxide ensures not only that the earth warms significantly, it also represents a threat to the oceans. The carbon dioxide, or CO2 acidifies the seawater and shellfish and corals affected fields. Especially the polar regions are in danger.

Acidification

-CO2 is a gas released by burning oil, gas, coal and wood.

-About half of the ‘human’ CO2 emissions is dissolved in seawater.

-CO2 in water (H2O) forms carbonic acid (H2CO3)

-This sours the seawater.

-The oceans absorb 25% to 30% of CO2 emissions

-On long terms it can raise up to 85% by mixing water and air on the surface of the ocean.

Sharp increase

-The increase of carbon dioxide is dangerous to crustaceans, shrimp, sea snails, plankton and algae.

-The acid eats calcareous minerals like calcite (CaCO3) and argoniet.

-Crustaceans need this as a foundation for their skeleton.

-In the Arctic sea was much worse.

-CO2 dissolves better in cold water.

-By 2100 the water so acidic that shells solve.

-In 2020 in the Arctic Sea has a shortage argoniet.

Acid measurement

-The pH scale measures acidity.

-The lower the pH value, the stronger the acid.

-Since the beginning of the industrial revolution, the pH of seawater declined from 8.16 to 8.05.

-By 2100 it will decline another 0.4.

Macina heliciana

-Acidification has catastrophic consequences for the entire food chain.

-Especially the Butterfly Blenny, a tiny mollusc (Limacina heliciana), is vulnerable.

-The mollusc is food for the baleinwalvis, salmon, herring and sea birds.

Buffer

-Acidification is also a disaster for deepwater corals (Lophelia pertusa).

-These corals form reefs.

-These reefs are a natural buffer against storm surge.

-The coral reefs are a paradise for fish and shellfish.

Written by Simon Ruymaekers

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