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Author Topic: Paleoclimate study (Pliocene -> Pleistocene)  (Read 2815 times)

Pmt111500

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Paleoclimate study (Pliocene -> Pleistocene)
« on: October 26, 2014, 05:51:39 AM »
Enhanced carbon drawdown by the ocean circulation changes during Pliocene - Pleistocene boundary coincident with the beginning of Pleistocene glacials, by models : http://news.rutgers.edu/news/past-climate-change-was-caused-ocean-not-just-atmosphere-new-rutgers-study-finds/20141023

jai mitchell

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Re: Paleoclimate study (Pliocene -> Pleistocene)
« Reply #1 on: October 31, 2014, 02:40:32 PM »
This is very interesting.  I always expected that a slowdown of the Meridional Overturning Circulation would lead to higher globally averaged temperatures.  Even though most northern hemisphere centric analyses showed a regional cooling (especially in Europe!).  I had spent more time considering carbon cycle feedbacks and atmospheric fraction impacts (due to significantly reduced oceanic carbon sequestration)

http://www.nature.com/ngeo/journal/v6/n2/full/ngeo1680.html

But, of course, reduced conveyor current flow yields significantly less upwelling, warmer surface temperatures and a reduced oceanic heat sink.   Only a very small shift in the heat absorption budget between ocean and atmosphere will yield significant changes in globally averaged surface temperatures.  And more, the rate of change of temperatures.
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jai mitchell

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Re: Paleoclimate study (Pliocene -> Pleistocene)
« Reply #2 on: October 31, 2014, 03:58:13 PM »
https://www.youtube.com/watch?v=9vyh9bM8Ds8&t=40m10s  ANDRIL drilling documentary from Ross Ice Shelf
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