Visit Indian Travel Sites
Goa,
Kerala,
Tamil Nadu,
Andhra Pradesh,
Delhi,
Rajasthan,
Uttar Pradesh,
Himachal Pradesh,
Assam,
Sikkim,
Madhya Pradesh,
Jammu & Kashmir
Karnataka
|
CO2 negatively affecting environment of world's oceans | A scientist has said that the increasing acidity of the world's oceans and its growing threat to marine
species are definitive proof that the atmospheric carbon dioxide (CO2) that is causing climate change is also negatively affecting the marine environment. The
statement has been made by Antarctic marine biologist Jim McClintock, professor
in the University of Alabama at Birmingham (UAB) Department of Biology, who has
spent more than two decades researching the marine species off the coast of Antarctica.
"The oceans are a sink for the carbon dioxide that is released into the atmosphere.
Carbon dioxide is absorbed by oceans, and through a chemical process hydrogen
ions are released to make seawater more acidic," said McClintock. "Existing data
points to consistently increasing oceanic acidity, and that is a direct result
of increasing carbon dioxide levels in the atmosphere; it is incontrovertible,"
he said. "The ramifications for many of the organisms that call the water home
are profound," he added. A substance's level of acidity is measured by its pH
value; the lower the pH value, the more acidic is the substance. According to
McClintock, data collected since the pre-industrial age indicates the mean surface
pH of the oceans has declined from 8.2 to 8.1 units with another 0.4 unit decline
possible by century's end. A single whole pH unit drop would make ocean waters
10 times more acidic, which could rob many marine organisms of their ability to
produce protective shells - and tip the balance of marine food chains. "There
is no existing data that I am aware of that can be used to debate the trend of
increasing ocean acidification," said McClintock. McClintock said that the delicate
balance of life in the waters that surround the frozen continent of Antarctica
is especially susceptible to the effects of acidification. "The impact on the
marine life in that region will serve as a bellwether for global climate-change
effects," he said. "The Southern Ocean is a major global sink for carbon dioxide.
Moreover, there are a number of unique factors that threaten to reduce the availability
of abundant minerals dissolved in polar seawater that are used by marine invertebrates
to make their protective shells," he added. "In addition, the increased acidity
of the seawater itself can literally begin to eat away at the outer surfaces of
shells of existing clams, snails and other calcified organisms, which could cause
species to die outright or become vulnerable to new predators," he explained. |
|
|
|
|
|