University of East Anglia researchers gauged CO2 absorption through more than 90,000 measurements from merchant ships equipped with automatic instruments.
Results of their 10-year study in the North Atlantic show CO2 uptake halved between the mid-90s and 2000 to 2005.
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| The study was carried out over the course of a decade |
Scientists believe global warming might get worse if the oceans soak up less of the greenhouse gas.
Researchers said the findings, published in a paper for the Journal of Geophysical Research, were surprising and worrying because there were grounds for believing that, in time, the ocean might become saturated with our emissions.
'Saturated' ocean
BBC environment analyst Roger Harrabin said: "The researchers don't know if the change is due to climate change or to natural variations.
"But they say it is a tremendous surprise and very worrying because there were grounds for believing that in time the ocean might become 'saturated' with our emissions - unable to soak up any more."
He said that would "leave all our emissions to warm the atmosphere".
Of all the CO2 emitted into the atmosphere, only half of it stays there; the rest goes into carbon sinks.
There are two major natural carbon sinks: the oceans and the land "biosphere". They are equivalent in size, each absorbing a quarter of all CO2 emissions.
Comment: With the quicker warming the Earth's glaciers will melt faster, diluting the salty water in the Atlantic ocean. This has already caused the Gulf Stream to slow down substantially affecting the weather during the last winter as reported on our website. This may lead to an eventual shutdown of the Gulf Stream and a cooling of the climate in the Northern Eurasia and America, paradoxically plunging Earth into another ice age, as some scientists speculate, that is, if a cycle of cometary showers doesn't do it first.