Study into oceans` past raises concern about its future
Washington: A new study has revealed that the ocean the Titanic sailed through just over 100 years ago was very different from the one we swim in today.
Global warming is increasing ocean temperatures and harming marine food webs.
Nitrogen run-off from fertilizers is causing coastal dead zones.
A McGill-led international research team has now completed the first global study of changes that occurred in a crucial component of ocean chemistry, the nitrogen cycle, at the end of the last ice age.
The results of their study confirm that oceans are good at balancing the nitrogen cycle on a global scale.
But the data also shows that it is a slow process that may take many centuries, or even millennia, raising worries about the effects of the scale and speed of current changes in the ocean.
"For the first time we can quantify how oceans responded to slow, natural climate warming as the world emerged from the last ice age," Prof. Eric Galbraith from McGill University`s Department of Earth and Oceanic Sciences, who led the study, said.
"And what is clear is that there is a strong climate sensitivity in the ocean nitrogen cycle," he said.
Using sediment gathered from the ocean floor in different areas of the world, the researchers were able to confirm that as the ice sheets started melting and the climate warmed up at the end of the last ice age, 18,000 years ago, the marine nitrogen cycle started to accelerate.
The ocean had stabilized itself in its new, warmer state, in which the overall nitrogen cycle was running faster, by about 8,000 years ago.
Given the current dramatic rate of change in the ocean nitrogen cycle the researchers are not sure how long it will take for marine ecosystems to adapt.
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