Earth Sciences Forum

Latecommer · Joined: 26 Jul 2007 Posts: 45 Location: Central California

In several papers that I have read in the past weeks,( Petit et al, Kininmonth, Archibald) I have observed that it appears to be accepted that the Milankovitch cycle of 100,000 yrs discribes, at its coolest point, a period of time when dust accumulation indicated a drying period.

That is the 'science' of the matter, and I now stray to the anecdotal record of history and ask; What caused the "dust bowl" event of the 1930's when the temperatures were at the highest of the last century.
As I understand history, the drought conditions accompaning the hot climate lasted 8 to 10 years and caused the migration of many people from of the lower midwest toward both coasts.

Was this just an exception to the general cool/dry conditions that have marked the major dust deposits in the ice core records?

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scpg02 · Joined: 22 Jul 2007 Posts: 221 Location: Sacramento

I thought the dust bowl had more to do with bad agricultural practices as anything else.

Latecommer · Joined: 26 Jul 2007 Posts: 45 Location: Central California

I imagine that was a part of it, but the extent of the problem (Minnesota to Texas) indicates at least a fluxuation in climate....to the point of an extended drought, Which occured at what was a warmer decade, According to theory, as I understand it, The 30's should have been one of higher humidity and rainfall.

Just curious about it never being mentioned in any of the papers I have read.
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hypatia · Joined: 24 Jul 2007 Posts: 7 Location: Michigan USA

One of my family members, recalls the winds from those years being very strong, stronger then normal. Very high temps too, with weeks of 100 F degree weather.
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Andre

Latecommer · Joined: 26 Jul 2007 Posts: 45 Location: Central California

Andre,

Can I assume that you, in main, agree with Jaworowski and his paper "CO2: the Greatest Scientific Scandal Of Our Time"? Do you agree in specific that the Ice Core data IPCC so depends on to reconstruct past CO2 concentrations and relative isotopic measurements, is fatally flawed?

Assuming a yes to the above, can you point to the deciding factors toward this POV?

Thanks,

Doug
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scpg02 · Joined: 22 Jul 2007 Posts: 221 Location: Sacramento

CO2: The Greatest Scientific
Scandal of Our Time
by Zbigniew Jaworowski, M.D., Ph.D., D.Sc.

Andre · Posted: Sat Aug 18, 2007 1:06 pm Post subject:

I've seen it, are you in yahoo CS group Maggie?

I have hesitated to post it here, for several reasons. I find it too offensive. If I was to be a genuine honest warmer, I'm sure that I was too shocked by the attacks to contemplate anything of the actual information. I would have sticked to exposing the problems between ice cores and other CO2 proxies/measurements.

As HPD has suggested, this news should have been brought cautiously, expressing all kind of doubts. For instance, about the important role of the paper of Ernst-Georg Beck. His digging up all the chemical measurements publications CO2 and assessing them, is very valuable. But you cannot state with confidence that a certain CO2 spike (page 45, fig 3) at a certain point, even for the duration of weeks, resembles the global average.

The error that I found, Doug, was in:

scpg02 · Joined: 22 Jul 2007 Posts: 221 Location: Sacramento

Andre · Posted: Sun Aug 19, 2007 9:01 am Post subject:

Latecommer · Joined: 26 Jul 2007 Posts: 45 Location: Central California

Thank you Andre,

I found his style offensive as well, but enjoyed the substance of his paper.
I agree that a few tentative first steps to raise interest in the idea would have been prudent.

thank you for your explaination

Doug

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