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||Artic Ocean Is No Longer A Sink [Uploaded 071111
- Measurements show that recent warming and drying of the Arctic have
changed the Arctic from a sink of CO2 to a source to the atmosphere
||CO2 is turning oceans acidic- The Times of India
world's oceans are absorbing large amounts of carbon dioxide (CO2), which
is increasing their acidity and threatening the survival of many marine species,
especially calcifying organisms including corals, shellfish and phytoplankton.
- the ocean is one of the Earth's largest natural
reservoirs of carbon and each year absorbs approximately one third of the
carbon dioxide emitted by human activities.
||Warming Water Means Less Oxygen For Sea Life
- In cold surface water, oxygen levels can reach as high as 300 to
400 micromols per kilogram,
- sea life becomes
stressed when it reaches between 60 and 120 micromols per kilogram.
- The researchers found concentrations as low as 10 in parts of the
eastern Pacific and the northern Indian Ocean and larger areas in the Atlantic
and Pacific were below 150.
||Carbon emissions creating acidic oceans not seen since dinosaurs
- Human pollution is turning the seas into acid so quickly that the
coming decades will recreate conditions not seen on Earth since the time
of the dinosaurs
- The scientists compared the current acidification rate with a giant
prehistoric release of greenhouse gas, which geologists know caused widespread
extinction of deep water species
||Oceans, forests less able to absorb carbon emissions
- Relying on nature to compensate for human excesses sounds like a
win-win situation -- except that these resources are under stress from the
very emissions we are asking them to absorb, making them less able partners
in the pact.
- Earlier this year, a team of nearly 70 researchers published a paper
in the journal Science showing that the drought-stressed Amazon rain forest
emitted roughly as much carbon dioxide in 2005 as it usually stores -- about
the same amount as the European Union and Japan together emit in a single
- the sea's uptake of carbon between 1765 and 2008, finding that the
proportion of fossil-fuel emissions absorbed by the oceans since 2000 may
have declined by as much as 10 percent.
and ocean carbon sinks took up 57 percent of human-generated carbon emissions
between 1958 and 2008. While the size of these sinks has expanded in the
past few decades, their absorption rate is slowing as greenhouse gas emissions
have risen (by 41 percent since 1990).
||Ocean acidification rates pose disaster for marine life, major study show
- The world's oceans are becoming acidic at a faster rate than at any
time in the last 55m years, threatening disaster for marine life and food
supplies across the globe
in the seas has increased 30% since the start of the industrial
- particularly coral reefs and the algae and plankton
which are essential for fish such as herring and salmon
- Although oceans have acidified naturally in the past, the current
rate of acidification is so fast that it is becoming extremely difficult
for species and habitats to adapt
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