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Published: Tuesday 20 August, 2013

discounted designer handbags discounted designer handbags Global warming is changing Arctic seas from CO2 sink to source of the greenhouse gas

The Arctic coastal seas are changing from a sink for atmospheric carbon dioxide to a source of the greenhouse gas because of global warming, new research warns.

Research into two seas bordering the polar region has shown that they are absorbing ever smaller amounts of atmospheric CO2 and, at points of the year, even becoming a source of the gas.

The shock finding suggests that climate change could be fast becoming a vicious, inescapable cycle which can only further accelerate the damage to the environment.

Source of greenhouse gases: In some months of the summer, the Laptev Sea warms so much that it begins releasing CO2 into the atmosphere

Most scientists agree that changes to the Earths climate are caused by increasing amounts of greenhouse gases released by humans from, for example, the combustion of fossil fuels.

Carbon dioxide plays a major role in this process. But, until 1994, approximately half for the worlds CO2 emissions from human combustion of fossil fuels was absorbed by the oceans.

As the amount of carbon dioxide in the oceans rises, however, their capacity to absorb the gas falls, and it remains in the atmosphere.

Irne Whlstrm, a marine researcher from the University of Gothenburg, Sweden, investigated two of the coastal seas off Siberia, the Laptev Sea and the East Siberian Sea, in a shipborne expedition, and in the case of the Laptev Sea by mathematical modelling.

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The greenhouse gases raise the temperature of the Earth and this increase is particularly noticeable in the Arctic, said Miss Whlstrm. It is even more pronounced in Siberia and its coastal seas.

The increase in temperature has an impact on the environm discounted designer handbags ent in the Arctic the cover of sea ice is lower, for example, and the supply of water from rivers increases, the permafrost thaws and the rate of coastal erosion increases.

One consequence is that organic matter that has been stored in soil is carried to the seas, where it is partially broken down to carbon dioxide, said Miss Whlstrm.

The East Siberian Sea has a western part and an eastern part, into which water flows from the Pacific Ocean.

The level of marine photosynthesis is high in these waters during the summer, and carbon dioxide is consumed. This leads to the level in the sea being lower than in the air, and the sea absorbs carbon dioxide from the air, says Irne Whlstrm.

The western East Siberian Sea receives also a major contribution from rivers, both directly from the land and from the neighbouring Laptev Sea.

The river water contains high levels of organic matter, which is partially broken down to carbon dioxide in the sea. This leads to the level in the sea being higher than in the air, and thus carbon dioxide flows from the sea into the air, accelerating climate change.

The East Siberian Sea: Water temperatures have warmed so much that the seas around the Arctic are no longer able to absorb as much carbon dioxide

The Laptev Sea had an excess of discounted designer handbags carbon dioxide during the late summer of 2008 that was of the same order of magnitude as the western East Siberian Sea, probably caused by the breakdown of organic matter from the land.

The results suggest that the Laptev Sea has changed from being a sink for atmospheric carbon dioxide to become a source of carbon dioxide during the late summer.

Miss Whlstrms work is the latest to suggest that changes in the Arctic climate have the potential to play havoc with the Earths delicate ecosystem.

Yesterday MailOnline Science reported how scientists have warned that global warming could be accelerated by new trees growing in the warming regions of the Arctic tundra.

By stimulating decomposition rates in soils, the expansion of forest into tundra in arctic Sweden could result in the release of carbon dioxide to the atmosphere.

Humans produce only a very small fraction of all CO2 emitted at any given time. Volcanic activity and decay of organic matter, leaves, bacteria etc is overwhelmingly the greatest producer of CO2. Another thing, we could do with some global warming. Heating/energy costs are a total ripoff and CO2 is not a pollutant. It is required for life to exist on this planet. Animal life forms inhale oxygen and exhale CO2, plants take in CO2 and produce oxygen for us. The more CO2 there is the greater is the plant yield. We can more than double atmospheric CO2 concentrations and still not get anywhere near previous levels when the Earth was warmer. Not that CO2 causes warming it doesnt. CO2 concentrations in the atmosphere FOLLOW warming. IE the Earth warms because of reduced cloud cover or increased solar output and this stimulates growth in plants etc and CO2 goes up correspondingly AFTER THE FACT. discounted designer handbags