Re: [Phys-l] An interesting fact about global warming.

[Bernard Cleyet <bernardcleyet@redshift.com>]

"Cloud cover has increased in many of the areas with reduced 
diurnal temperature range."


I see; CO2 clouds.

bc, thinks unanimous is like infinite and other words that can not 
modified.  (It is or it isn't; no half measures.)

David T. Marx wrote:

> Oreske did mention this in her talk as part of the evidence that it is 
> increased CO2 and not solar forcing.  The variation in the Earth's 
> albedo is not something that seems to be well understood as of yet.
>
>  
>
> > Maybe everyone else knows this, but I just came upon it in the last month.
> >
> > From:
> >
> > http://lwf.ncdc.noaa.gov/oa/climate/globalwarming.html#Q1
> >
> > There has been a general, but not global, tendency toward reduced diurnal 
> > temperature range (DTR), (the difference between high and low daily 
> > temperatures) over about 50% of the global land mass since the middle of the 
> > 20th century. Cloud cover has increased in many of the areas with reduced 
> > diurnal temperature range. The overall positive trend for maximum daily 
> > temperature over the period of study (1950-93) is 0.1�C/decade, whereas the 
> > trend for daily minimum temperatures is 0.2�C/decade. This results in a 
> > negative trend in the DTR of -0.1�C/decade.
> >
> >
> > In other words, about 2/3 of the observed warming is due to higher night-time temps with only 1/3 due to higher daytime temps.  While, I think, this actually supports 'greenhouse' warming, it might also factor into some of the more extreme 'doomsday' scenarios--to lessen them perhaps?    Not sure....but I find it interesting that seemingly (I may have missed it) this is not the kind of information fed to the public.
> >
> > Rick
> >
> > ***************************
> > Richard W. Tarara
> > Professor of Physics
> > Saint Mary's College
> > Notre Dame, IN
> > rtarara@saintmarys.edu
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