jet contrails and solar output [RE-wrenches]

[Tom Elliot, Guffey Energy Works]

Actually, I saw the previous NASA administrator Dan Goldin in a press
conference where he described the studies NASA has done re: contrails and
their effect on weather.  Apparently they have been studying this for a long
time and concluded that the impact was so severe that they were canceling
the work on a hypersonic transport because the negative impact on weather
from such persistent high altitude contrails was potentially severe enough
to cause concern.

Contrails will spread over time and given enough moisture at the right
altitudes and enough traffic through a particular area, can produce an
identifiable persistent local weather pattern, including negative impacts on
insolation and increased localized precipitation.

The Arizona and Colorado fires left us with such severe smoke and haze that
our PV output was cut by a minimum of 30%, some days more.

Tom

----- Original Message -----
From: "Windy Dankoff, Dankoff Solar" <windy at dankoffsolar.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, July 11, 2002 12:53 PM
Subject: Re: jet contrails and solar output [RE-wrenches]


> Contrails is short for condensation trails. They are primarily water
> vapor, thus man-made clouds.
>
> I can't imagine how they are going to reduce sun intensity, unless
> the sunshine is passing right through the trail/cloud.
>
> Solar loss due to uniform pollution of the atmosphere is a separate
> issue. I've seen solar intensity reduced by 25% by a polluted sky,
> where the sky looked blue and people didn't notice it. However, PV
> output was reduced accordingly.
>
> Windy
>
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