Canadian study blames ocean acidification for mass extinction


Via Scoop.itOcean Acidification

A Canadian-led team of scientists may have solved the biggest whodunit in Earth history in a study showing that the all-time greatest mass extinction on the planet — which wiped out about 90 per cent of all species 250 million years ago — appears…

Researchers have long believed that massive volcanic eruptions in present-day Siberia — or possibly a huge meteorite strike — triggered the so-called Permian-Triassic extinction. But the precise mechanism of death for so many species remains a subject of debate, with some scientists convinced it was a resulting lack of oxygen in the Earth’s oceans or a greenhouse-gas nightmare that nearly ended all plant and animal life.   But the Canadian study, headed by St. Francis Xavier University climate scientist Alvaro Montenegro, points to ocean acidification as a possible “main culprit” in the harrowing, prehistoric die-off.
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One thought on “Canadian study blames ocean acidification for mass extinction

  1. Lars Tuff

    Lets look at the facts: Oceanic acidification the last 300 years: Rise from pH 8.3 to pH 8.18. No big deal. CO2 rise in the atmosphere: 0.029 (1820) to 0.038 (2010) – Less than 1/100 of a percent in about 200 years. Insignificant. Temperature rise in lower troposphere the last 30 years: None. Temperature rise on earth’s surface the last 10 years: None.

    This theory og CO2 increase and rising temperature, ocean acidification and so on is falsified by the empirical data. The oceans capacity to absorb and release CO2 combined with a minute rise in photosynthesis from plants, algae, plankton and bacteria around the world will take care of a minor rise in CO2.

    CO2 s effectiveness as a greenhouse gas diminishes as concentration grow higher – the relationship is strictly logarithmic. Even a doubling of CO2 in earth’s atmosphere will give no dramatic temperature rise. And we are nowhere near a doubling.

    Fiddling with the graphs in Mathematica to find an appropriate feedback function, increasing CO2s effect on climate, based on Taylor/MacLaurin Series from the mid 1700s, will not change the facts. Any data could be made to fit such a feedback function. A rise in temperature the next ten years – a bit more fiddling, a decline the next ten years, more fiddling, and magically one would get a graph that fits the data and STILL gives us a temperature rise of 1.5, 2, 3, 4, 6 or even 12 deg, Celsius in 2100. Well really…

    Lets say the oceans did become acidic during the permian extinction. Why are the calcium skeletons from this period still found in the oceans and on land today, in wast abundance? They would have been eroded away were the oceans really acidic. Why did ammonites and molluscs survive this period, if the oceans were acidic? They are both very sensitive to acidification. And last, but not least: What mysterious source of alkali brought the oceans back to their normal pH of 8.3 after the permian extincion? Calcium meteorites from the sky?

    The theory of ocean acidification and mass extinction might impress non scolars or even non scientific scolars. But it is utter nonsense. I see some of the global warmers are trying to link this nonsense up with dead sones in the seas, and in this way pathetically trying to convince people that the new so called thruth about the permian extincion has relevance for us today.

    Well, telling one lie and adding one half-truth does not, in my mind, comprise even one tiny molecule of truth. Stop telling grown up people these fairy tales, and stick to reality.

    And do not allow scolars to put forward hypothesis as were they theories, before peer-review and critical objections are answered in a correct manner. Treat global warming enthusiasts with the same lack of interest and the same hostility as that experienced by Henrik Svensmark, when he tried to publish his theory of solar magnetic activity, cosmic rays and cloud formation, some years ago.

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