The Forum > Article Comments > Ice Age theories warming up > Comments
Ice Age theories warming up : Comments
By Mark S. Lawson, published 30/4/2010Whatever affect industrial activity is supposed to have had on climate may well be swamped by natural cooling.
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I think you'll find that it says: "Deep-sea temperatures warmed by 2°C between 19 and 17 thousand years before the present (ky B.P.), leading the rise in atmospheric CO2 and tropical–surface-ocean warming by 1000 years. The cause of this deglacial deep-water warming does not lie within the tropics, nor can its early onset between 19 and 17 ky B.P. be attributed to CO2 forcing. Increasing austral-spring insolation combined with sea-ice albedo feedbacks appear to be the key factors responsible for this warming"
That is, the deep-sea warming (but only the deep-sea temps, not the surface or atmospheric temps) pre-dated the CO2 output, which apparently drives the sea surface warming. This means that something else is happening pre-dating the CO2 output and the associated ATMOSPHERIC and sea-surface warming caused by 1000 years. OK, I can accept this, but this is not what you said or even interpreted. Because apparently the authors say that CO2 is quite well associated with tropical sea-surface warming. I think I'll have to give you a C+ on this one.
By the way, has the latest round of deep-sea warming been noticed from the last 1000 years that could give rise to this supposedly natural CO2 increase and subsequent warming have recently experienced? I'd love to see a reference on that. I'll review your mark if you can get one. I'd also like to find out how this deep-sea warming fits in with the solar magnetic theory. Or is that total solar output "model" (oh how you love models!). A good reference on the "solar-magnetic theory" would be nice too BTW.