Australian Politics Forum - Anthropogenic Global Warming

greggerypeccary

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Re: Anthropogenic Global Warming
Reply #135 - Feb 27^th, 2017 at 10:49am

Jovial Monk wrote on Feb 27^th, 2017 at 10:46am:

Quote:

Atmospheric carbon dioxide concentrations over the past 60 million years

Paul N. Pearson1 & Martin R. Palmer2

Department of Earth Sciences, University of Bristol, Queens Road, Bristol BS8 1RJ, UK
T. H. Huxley School, Imperial College, RSM Building, Prince Consort Road, London SW7 2BP, UK
Correspondence to: Paul N. Pearson1 Correspondence and requests for materials should be addressed to P.N.P. (e-mail: Email: Paul.Pearson@Bristol.ac.uk).

Abstract
Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth's history is important for a reconstruction of the links between climate and radiative forcing of the Earth's surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are most important for the control of CO2 concentrations over geological timescales. Here we use the boron-isotope ratios of ancient planktonic foraminifer shells to estimate the pH of surface-layer sea water throughout the past 60 million years, which can be used to reconstruct atmospheric CO2 concentrations. We estimate CO2 concentrations of more than 2,000 p.p.m. for the late Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago), and find an erratic decline between 55 and 40 Myr ago that may have been caused by reduced CO2 outgassing from ocean ridges, volcanoes and metamorphic belts and increased carbon burial. Since the early Miocene (about 24 Myr ago), atmospheric CO2 concentrations appear to have remained below 500 p.p.m. and were more stable than before, although transient intervals of CO2 reduction may have occurred during periods of rapid cooling approximately 15 and 3 Myr ago.

So CO2 concentration in the atmosphere appears to have been stable for 24 million years until we started burning fossil fuels. Clever us.

Ah.

"appears to"

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lee

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Re: Anthropogenic Global Warming
Reply #136 - Feb 27^th, 2017 at 11:01am

Jovial Monk wrote on Feb 27^th, 2017 at 4:08am:

Quote:
By various metrics, the 2015–2016 El Niño winter was one of the three strongest events in the historical record. For example, in the boreal winter of 2015–2016 the Oceanic Niño Index, a 3-month running mean of sea surface temperatures in the eastern tropical Pacific, reached the highest value in its 66-year history

And still managed only 0.01ºC +/- 0.16ºC from 2015. That is of course if you believe we can estimate SST's to hundredths of a degree. Wink

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lee

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Re: Anthropogenic Global Warming
Reply #137 - Feb 27^th, 2017 at 11:03am

Jovial Monk wrote on Feb 27^th, 2017 at 5:04am:

Quote:
Seasonal water-level anomalies averaged 11 cm above the mean across the study area during the winter of 2015–2016, with the highest anomaly (+17 cm) measured on the Oregon coast (Fig. 3c). The anomalies were significantly less than in 1997–1998 across all regions, particularly in Northern California and in the Pacific Northwest (averaged +23 cm in 1997–1998).

So the water level in 2015/6 were lower than in the 1997/8 El Nino. Why?

The buildup of Antarctic ice?

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lee Gold Member Offline Australian Politics Posts: 21758 Gender:	Re: Anthropogenic Global Warming Reply #138 - Feb 27^th, 2017 at 11:06am greggerypeccary wrote on Feb 27^th, 2017 at 10:49am: Ah. "appears to" Good point. How would you see a spike in CO2 of 100 years in 60 million years? Of course it could be like sea ice. It was always stable until CO2.
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Jovial Monk

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Re: Anthropogenic Global Warming
Reply #139 - Feb 27^th, 2017 at 2:22pm

greggerypeccary wrote on Feb 27^th, 2017 at 10:49am:

Jovial Monk wrote on Feb 27^th, 2017 at 10:46am:

Quote:

Atmospheric carbon dioxide concentrations over the past 60 million years

Paul N. Pearson1 & Martin R. Palmer2

Department of Earth Sciences, University of Bristol, Queens Road, Bristol BS8 1RJ, UK
T. H. Huxley School, Imperial College, RSM Building, Prince Consort Road, London SW7 2BP, UK
Correspondence to: Paul N. Pearson1 Correspondence and requests for materials should be addressed to P.N.P. (e-mail: Email: Paul.Pearson@Bristol.ac.uk).

Abstract
Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth's history is important for a reconstruction of the links between climate and radiative forcing of the Earth's surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are most important for the control of CO2 concentrations over geological timescales. Here we use the boron-isotope ratios of ancient planktonic foraminifer shells to estimate the pH of surface-layer sea water throughout the past 60 million years, which can be used to reconstruct atmospheric CO2 concentrations. We estimate CO2 concentrations of more than 2,000 p.p.m. for the late Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago), and find an erratic decline between 55 and 40 Myr ago that may have been caused by reduced CO2 outgassing from ocean ridges, volcanoes and metamorphic belts and increased carbon burial. Since the early Miocene (about 24 Myr ago), atmospheric CO2 concentrations appear to have remained below 500 p.p.m. and were more stable than before, although transient intervals of CO2 reduction may have occurred during periods of rapid cooling approximately 15 and 3 Myr ago.

So CO2 concentration in the atmosphere appears to have been stable for 24 million years until we started burning fossil fuels. Clever us.

Ah.

"appears to"

Not a denier, eh Greggy? Much!

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Bobby.

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Re: Anthropogenic Global Warming
Reply #140 - Feb 27^th, 2017 at 6:23pm

Ajax wrote on Feb 26^th, 2017 at 9:37pm:

Jovial Monk wrote on Feb 26^th, 2017 at 9:32pm:

A study by the US Geological Survey shows that the El Nino/La Nina cycle is getting more and more extreme.

Cover that tomorrow or later in the week.

So what, its a cycle that has been around for ever.

If your suggesting that the increase in CO2 is the cause...!

Then what would it have been like when we had 7000ppm of CO2 in the atmosphere

End of the world.....???

http://i45.tinypic.com/vf8b5l.jpg

http://s155.n46.n171.n68.static.myhostcenter.com/WVFossils/Reference_Docs/Geocarb_III-Berner.pdf

7000ppm -

& Jovial ignores it.

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greggerypeccary

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Re: Anthropogenic Global Warming
Reply #141 - Feb 27^th, 2017 at 6:26pm

Jovial Monk wrote on Feb 27^th, 2017 at 2:22pm:

greggerypeccary wrote on Feb 27^th, 2017 at 10:49am:

Jovial Monk wrote on Feb 27^th, 2017 at 10:46am:

Quote:

Atmospheric carbon dioxide concentrations over the past 60 million years

Paul N. Pearson1 & Martin R. Palmer2

Department of Earth Sciences, University of Bristol, Queens Road, Bristol BS8 1RJ, UK
T. H. Huxley School, Imperial College, RSM Building, Prince Consort Road, London SW7 2BP, UK
Correspondence to: Paul N. Pearson1 Correspondence and requests for materials should be addressed to P.N.P. (e-mail: Email: Paul.Pearson@Bristol.ac.uk).

Abstract
Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth's history is important for a reconstruction of the links between climate and radiative forcing of the Earth's surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are most important for the control of CO2 concentrations over geological timescales. Here we use the boron-isotope ratios of ancient planktonic foraminifer shells to estimate the pH of surface-layer sea water throughout the past 60 million years, which can be used to reconstruct atmospheric CO2 concentrations. We estimate CO2 concentrations of more than 2,000 p.p.m. for the late Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago), and find an erratic decline between 55 and 40 Myr ago that may have been caused by reduced CO2 outgassing from ocean ridges, volcanoes and metamorphic belts and increased carbon burial. Since the early Miocene (about 24 Myr ago), atmospheric CO2 concentrations appear to have remained below 500 p.p.m. and were more stable than before, although transient intervals of CO2 reduction may have occurred during periods of rapid cooling approximately 15 and 3 Myr ago.

So CO2 concentration in the atmosphere appears to have been stable for 24 million years until we started burning fossil fuels. Clever us.

Ah.

"appears to"

Not a denier, eh Greggy?

Correct.

I'm a sceptic.

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Adamant Gold Member Offline Australian Politics Posts: 1893 Brisbane Gender:	Re: Anthropogenic Global Warming Reply #142 - Feb 27^th, 2017 at 6:40pm greggerypeccary wrote on Feb 22^nd, 2017 at 9:44am: Jovial Monk wrote on Feb 22^nd, 2017 at 5:27am: Is happening. There's no proof though. Prove that theory of yours greggerypeccary!
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greggerypeccary Gold Member Online Australian Politics Posts: 156551 Gender:	Re: Anthropogenic Global Warming Reply #143 - Feb 27^th, 2017 at 6:43pm Adamant wrote on Feb 27^th, 2017 at 6:40pm: greggerypeccary wrote on Feb 22^nd, 2017 at 9:44am: Jovial Monk wrote on Feb 22^nd, 2017 at 5:27am: Is happening. There's no proof though. Prove that theory of yours greggerypeccary! I don't have a theory. Try someone else.
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Adamant Gold Member Offline Australian Politics Posts: 1893 Brisbane Gender:	Re: Anthropogenic Global Warming Reply #144 - Feb 27^th, 2017 at 6:43pm TheFunPolice wrote on Feb 22^nd, 2017 at 12:58pm: Gordon wrote on Feb 22^nd, 2017 at 9:50am: I believe in AGW but it's not going to cause end times like the merchants of panic believe. it all depends on greenland Wow, I never knew that Greenland was or is our salvation. Does the ice pollute now?
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Adamant Gold Member Offline Australian Politics Posts: 1893 Brisbane Gender:	Re: Anthropogenic Global Warming Reply #145 - Feb 27^th, 2017 at 6:46pm greggerypeccary wrote on Feb 22^nd, 2017 at 9:44am: Jovial Monk wrote on Feb 22^nd, 2017 at 5:27am: Is happening. There's no proof though. When have you ever required "proof" of anything? Exception is your daily intake of grog!
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Bobby. Gold Member Online Australian Politics Posts: 122957 Melbourne Gender:	Re: Anthropogenic Global Warming Reply #146 - Feb 27^th, 2017 at 6:47pm Adamant wrote on Feb 27^th, 2017 at 6:46pm: greggerypeccary wrote on Feb 22^nd, 2017 at 9:44am: Jovial Monk wrote on Feb 22^nd, 2017 at 5:27am: Is happening. There's no proof though. When have you ever required "proof" of anything? Exception is your daily intake of grog! What - Greggy hits the bottle?
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greggerypeccary

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Re: Anthropogenic Global Warming
Reply #147 - Feb 27^th, 2017 at 6:49pm

Adamant wrote on Feb 27^th, 2017 at 6:46pm:

greggerypeccary wrote on Feb 22^nd, 2017 at 9:44am:

Jovial Monk wrote on Feb 22^nd, 2017 at 5:27am:

Is happening.

There's no proof though.

When have you ever required "proof" of anything?

One doesn't always require proof.

For example, the fact that you're a dim-witted sock puppet is a given

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Adamant

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Re: Anthropogenic Global Warming
Reply #148 - Feb 27^th, 2017 at 6:52pm

greggerypeccary wrote on Feb 24^th, 2017 at 12:01pm:

lee wrote on Feb 24^th, 2017 at 11:36am:

Jovial Monk wrote on Feb 24^th, 2017 at 11:05am:

Calculations showed—a bit of cooling but MEASUREMENT showed—a bit of warming! How?

Which shows we really know very little. We obviously don't know all the parameters. How sad for AGW tragics who like to tell us the science is settled.

That's the bit that annoys me.

I'm an AGW skeptic,

LoL

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greggerypeccary

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Re: Anthropogenic Global Warming
Reply #149 - Feb 27^th, 2017 at 6:54pm

greggerypeccary wrote on Feb 27^th, 2017 at 6:49pm:

Adamant wrote on Feb 27^th, 2017 at 6:46pm:

greggerypeccary wrote on Feb 22^nd, 2017 at 9:44am: