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       Earth Sciences Forum Forum Index -> Atmosphere, Ocean, and Climate
Andre

Positive feedback fading.

As the direct warming effect of CO2 greenhouse effect is marginal, (arguably beween 0.1 and 1.0 degrees C per doubling), we invented the famous positive feedback, notably of the much stronger water vapor, snow albedo and what not to get it to the ~3 degrees per doubling CO2.

It's almost over

positive feedback, have we been fooling ourselves?

But then again, we knew that already for years:

http://www.aai.ee/~olavi/2001JD002024u.pdf

Not much science left for anthropogenic global warming
Baywax

Quote:
... the solar irradiance measurements
have been carried out using different radiometers and
satellites. The results are collected, adjusted, cross-calibrated
[Fro¨hlich and Lean, 1998a; Fro¨hlich and Lean,
1998b], and available online. Earlier attempts to find a
direct statistical relationship between the solar activity and
air temperature were unsuccessful [Monin and Vulis, 1971].
However, Friis-Christensen and Lassen [1991] recently
found that the variation of the solar cycle length closely
matches the long-term variation of the Northern Hemisphere
land air temperature during the past 130 years. Modern
precise series enable us to study the temporal variability of
both the irradiance and temperature anomalies in more
detail due to better temporal resolution.


http://www.aai.ee/~olavi/2001JD002024u.pdf

How do we know what the solar cycle was doing 130 years ago? Were records of the sun's cycles well recorded in the 1800s? Also, the same article suggests that only 18% of the earth was meterologically monitored 130 years ago. How can we assume what the "long term variation of the Northern Hemisphere land/air temps" were during this period?

Otherwise, thanks Andre! Wink
Andre

Of course the monitoring of solar activity was highly primitive. Counting sun spots has been done for a few hundred years. Furthermore radiocarbon (14C) is a proxy for solar nucleair particle activity. Also the production rate of 10Be.

I'll dig up a few papers about that. Kärner is basing his work on satellite data though, if I recall correctly.
Baywax

Andre wrote:
Of course the monitoring of solar activity was highly primitive. Counting sun spots has been done for a few hundred years. Furthermore radiocarbon (14C) is a proxy for solar nucleair particle activity. Also the production rate of 10Be.

I'll dig up a few papers about that. Kärner is basing his work on satellite data though, if I recall correctly.


OK Andre, my questions are cleared up with the study and monitoring of C14. I guess its a bit like film recording any variability in solar nuclear particle activity.

Thanks again.

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