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12:24pm Friday 18th July 2008
RE:SNOW IN 1907 (BFP July 11)
UNLESS those who still follow the IPCC's crusade can satisfactorily answer last week's question posed by Anthony Weeden, we should continue to deride their persistent prattle claiming that mankind is
responsible for global warming'.
The pre-historic variations in global mean surface temperature referred to by Mr Weeden incorporate the results of analyses of ice core drillings made by the British Antarctic Survey in the 1990s.
These were published in The Royal Commission on Environmental Pollution's 22nd Report in June, 2000 (RCEP 22).
Fig.2-V of that report, entitled Energy -the Changing Climate', shows the near-synchronous variations in local surface temperature and atmospheric carbon dioxide content which occurred during the past 450,000 years or so. Approximately every 100,000 years during that period, the Earth's local surface temperature, close to the South Pole, dropped jerkily from a peak to a trough about 13 degrees C lower, and then jumped back smoothly and rapidly to a similar peak.
In sympathy - though actually several decades afterwards - the carbon dioxide content fell jerkily from a peak of about 300 parts per million by volume (ppmv) to a trough of about 180 ppmv, then rose (rapidly and mostly smoothly) back again to a similar peak.
From my own calculations of the greenhouse effect of global warming, assuming solar radiation to be constant during that period (which it clearly was not), the 120 ppmv change in carbon dioxide level could not have induced a global warming change of more than about 0.5 degrees C. These calculations also show that trimming carbon dioxide levels by the colossal 60% or so aimed at in the latest IPCC jamboree could not reduce the global mean surface temperature by more than about 0.25 degrees C assuming constant solar input.
Atmospheric water - in the form of vapour, liquid (cloud and rain) and solid (ice) - is by far the dominant greenhouse substance, swamping the small effects of carbon dioxide in even the highest concentrations we can possibly generate by burning carbonaceous fuels as if there were no tomorrow.
Cloud, as well as forming a significant part of the greenhouse blanket', is also a potent shield against the Sun's rays. By increasing its extent during prolonged warm periods it reflects solar energy back into space, and by reducing its extent during prolonged cold spells it lets more sunshine through. It thus acting as an automatic Venetian blind.
The carbon dioxide changes in the Vostok Ice Sheet core analyses can be explained as the result of photosynthesis.
A warm Earth stimulates plant growth and subsequent decay to produce both methane (a potent greenhouse gas) and carbon dioxide.
A cold Earth arrests plant decay and thus inhibits carbon dioxide production, while photosynthesis at a reduced rate continues to deplete the atmosphere's stock of this gas.
Pre-historic global warming is therefore clearly due mainly to causes other than carbon dioxide, and - since this is fundamentally an energy phenomenon - it has to be attributed to variations in solar energy received by the Earth. Changes in the Earth's orbit (the Milankovitch theory) and orientation (axial tilt and precession of the equinoxes) clearly play some part, but these are minor in comparison with changes in the Sun's energy output. Why? Simply because the shape of the temperature/time curve due to gravitational effects has to be symmetrical in order to be repeatable, whereas the dominant shapes shown of RCEP's Fig.2-V are strongly asymmetrical.
I suggest that these solar energy changes are the result of continuing variations in the Sun's internal thermo-nuclear activity. One explanation could be that the Sun alternately accretes interstellar hydrogen and deuterium by its intense gravitational power during periods when energy output is low, then brakes - or halts - such accretion when energy levels increase.
The rapid rise in radiation pressure which follows increasing core temperature propels interstellar matter away from the Sun, forming a powerful buffer.
Gravitational attraction acts much more gently during the longer decay period. There are, perhaps, other viable explanations Yes, mankind certainly affects global warming a little by the burning
of fossil fuels, and even just by breathing! But by far the greatest effect is created by the Sun's inherent energy variations, however caused, and to a lesser extent by the changes in the Earth's
orbit and the tilt of its axis of rotation. So there we have it!
Roderick Taylor
Chartered Engineer
Abbotsbrook
Bourne End
Dave Hampton, Marlow says...
9:56am Sat 19 Jul 08
tom, marlow says...
5:42pm Sat 19 Jul 08
Dave Hampton, Marlow says...
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williams, London says...
6:05pm Wed 30 Jul 08
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williams, London says...
10:24am Thu 31 Jul 08
Dave Hampton, Marlow says...
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Dave Hampton, Marlow says...
9:16am Fri 1 Aug 08
tom, marlow says...
9:22am Fri 1 Aug 08
Dave Hampton, Marlow says...
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williams, London says...
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williams, London says...
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Dave Hampton, Marlow says...
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williams, London says...
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Dave Hampton, Marlow says...
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williams, London says...
6:25pm Sat 2 Aug 08
tom, marlow says...
9:47pm Sat 2 Aug 08
Bill said
Tom's claim that "ice everywhere is melting" is completely incorrect.The Antarctic has been getting colder and increasing in ice-mass for years
Dave Hampton, Marlow says...
11:35pm Sat 2 Aug 08
Dave Hampton, Marlow says...
11:52pm Sat 2 Aug 08
williams, London says...
11:50am Sun 3 Aug 08
Dave Hampton, Marlow says...
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Dave Hampton, Marlow says...
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Dave Hampton, Marlow says...
2:42pm Sun 3 Aug 08
tom, marlow says...
4:07pm Sun 3 Aug 08
Bill Williams wrote
Dear Tom, I sincerely apologise for getting one of your posts confused with one of Dave's. It was not my intention to put words in your mouth and I hope you can appreciate it was an honest mistake.
In answer to your further comments regarding this issue, the evidence of the planet warming over the past 50 years does not prove that it is anthropogenic activity that is the cause. I would also urge you to check your data on the Antarctic ice mass and the degree of divergence of the arctic sea ice levels from the 1979-2001 average.
Once again, sorry for accusing you of a statement you didn't make.
Dave Hampton, Marlow says...
4:26pm Sun 3 Aug 08
Dave Hampton, Marlow says...
4:41pm Sun 3 Aug 08
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8:02am Mon 4 Aug 08
Dave Hampton, Marlow says...
11:18am Mon 4 Aug 08
Dave Hampton, Marlow says...
11:19am Mon 4 Aug 08
williams, London says...
9:06pm Mon 4 Aug 08
Time and time again I read of loss of polar ice coverage, receding glaciers (I've seen then for myself). Is this all lies?
Unusual atmospheric conditions set up wind patterns that compressed the sea ice, loaded it into the Transpolar Drift Stream and then sped its flow out of the Arctic, said Son Nghiem of NASAs Jet Propulsion Laboratory and leader of the study. When that sea ice reached lower latitudes, it rapidly melted in the warmer waters.
tom, marlow says...
9:24pm Mon 4 Aug 08
williams, London says...
10:27pm Mon 4 Aug 08
I note that you are now accepting that the ice is melting.
"ice everywhere is melting"
what caused the unusual weather conditions?"
Dave Hampton, Marlow says...
2:15am Tue 5 Aug 08
BT1, Going to Iceland says...
3:42pm Tue 5 Aug 08
williams, London says...
4:31pm Tue 5 Aug 08
Dave Hampton, Marlow says...
7:50pm Tue 5 Aug 08
Dave Hampton, Marlow says...
8:05pm Tue 5 Aug 08
wayne, wycombe says...
8:12pm Tue 5 Aug 08
williams, London says...
9:33pm Tue 5 Aug 08
Has he, in any form, presented these ideas for scrutiny to the IPCC or to any other academic audience?
Dave Hampton, Marlow says...
11:56pm Tue 5 Aug 08
Dave Hampton, Marlow says...
12:01am Wed 6 Aug 08
Dave Hampton, Marlow says...
12:05am Wed 6 Aug 08
williams, London says...
8:47am Wed 6 Aug 08
Dave Hampton, Marlow says...
9:38am Wed 6 Aug 08
tom, marlow says...
9:40am Wed 6 Aug 08
Dave Hampton, Marlow says...
9:40am Wed 6 Aug 08
Dave Hampton, Marlow says...
9:42am Wed 6 Aug 08
Dave Hampton, Marlow says...
9:50am Wed 6 Aug 08
Dave Hampton, Marlow says...
9:55am Wed 6 Aug 08
williams, London says...
10:48am Wed 6 Aug 08
but there existence does not invalidate all the evidence - or necessarily any of the evidence, it just questions certain aspects.
Dave Hampton, Marlow says...
12:17pm Wed 6 Aug 08
tom, marlow says...
1:46pm Wed 6 Aug 08
williams, London says...
4:18pm Wed 6 Aug 08
tom, marlow says...
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williams, London says...
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williams, London says...
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wayne, wycombe says...
12:59pm Thu 7 Aug 08
tom, marlow says...
2:01pm Thu 7 Aug 08
williams, London says...
1:45pm Fri 8 Aug 08
Dave Hampton, Marlow says...
12:49pm Sun 10 Aug 08
Dave Hampton, Marlow says...
1:47pm Sun 10 Aug 08
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Dave Hampton, Marlow says...
4:30pm Fri 18 Jul 08
"Yes, mankind certainly affects global warming a little by the burning of fossil fuels, and even just by breathing!" he writes.)
No need to hold your breath readers.
If your carbon footprint is average for UK, let alone for Marlow, the CO2 you breathe out will be just one twenty fifth of your fossil fuel generated 'footprint' of CO2 emissions.
Plus, more fundamentally, most of us don't eat or drink pure fossil fuel, so the CO2 breathed out is mainly part of the natural ongoing circle of life, and not part of the breaking of that cycle by the release of locked up carbon (ancient sunlight) from 100s millions of years ago.
i.e. Plants grow into the food we eat, absorbing CO2, animals eat plants and release some CO2, but hardly any of this is 'new' CO2, unless the food we eat is heavily industrially processed, air-flown and fertiliser hot-housed.
Or unless we drink oil!