Re: The weather and the many different factors that drive it...
From: Alastair McDonald (alastair_at_abmcdonald.leavethisout.freeserve.co.uk)
Date: 03/12/05
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Date: Sat, 12 Mar 2005 11:10:40 -0000
"Eric Swanson" <swanson@notspam.net> wrote in message
news:d0t4cm$eue6$1@news3.infoave.net...
> In article <42320f3b$1_1@127.0.0.1>,
peter.bantick@tiscali.co-dot-uk.no-spam.invalid says...
> >
> >hi everyone,just thought I'd make a topic on the weather and also the
> >many different factors and how everything forms(this will be a very
> >long post but hopefully very informative..so firstly we should start
> >off wih some basics.
> >
> >For those who don't know what those "Highs" and "Lows" stand for on
> >the charts here is a brief description of them,which you will
> >hopefully understand,Air pressure is a measure of how much air is
> >pushing down on the surface of the Earth at a given point. Generally,
> >high- and low-pressure systems form when air mass and temperature
> >differences between the surface of the Earth and the upper atmosphere
> >create vertical currents. In a low-pressure system, these vertical
> >winds travel upwards and suck air away from the surface of the Earth
> >like a giant vacuum cleaner, decreasing the air pressure above the
> >ground or sea. This decrease in surface air pressure in turn causes
> >atmospheric currents moving parallel to the surface of the Earth near
> >the base of the low to spin counter clockwise (clockwise in the
> >Southern Hemisphere). Conversely, in a high-pressure system, air is
> >being pushed down on the ground like a vacuum put in reverse. The
> >downward vertical winds cause an increase in air pressure on the
> >ground and force atmospheric currents to spin clockwise (counter
> >clockwise in the Southern Hemisphere). Both lows and highs function
> >like giant slow-moving hurricanes and anti-cyclones, respectively.
> >The higher in pressure a high-pressure system gets or the lower in
> >pressure a low-pressure system gets, the more robust and larger this
> >spinning circulation pattern becomes.
>
Well, that is a nice friendly remark!
> First off, vacuums can't "suck" a fluid.
He said vacuum cleaners, not vacuum, which do in fact suck!
Sorry to bust your bubble, but your beginning (and likely/////// everything
else) is very wrong.
> The force of gravity doesn't
> push the air towards the earth, it pulls it.
The weight of the air above a point pushes the air beneath it and that is
what we measure when we measure air pressure - a push from the air
above, not the gravitational force on the surrounfing air molecules!
> The rotation of an airmass
> is due to the Coriolis Effect, as air moves from one latitude to another.
> In the NH, the highs rotate in a clockwise direction, while in the SH,
> they rotate the other way. The low pressure areas are the result of
> horizontal horizontal motions in the atmosphere and vorticity, that
> is, the tendency for a fluid to maintain its rotation.
>
> http://www.answers.com/coriolis+effect&r=67
If the Coriolis effect is due to the rotation of the Earth affecting the
flow of air from one latitude to another, why do anti-cyclones rotate
in one direction and depressions in another? (BTW. That was a
rhetorical question requiring no answer. There are plenty of specious
arguments used to justify the misuse of the Coriolis effect.)
> Might I suggest that you would benefit by reading an introductory college
> level text on meteorology?
Might I suggest that you would benefit by ceasing to read introductory college
level texts on meteorology, and start thinking about some of these problems
for yourself, much as it appears climateshift has done!
Cheers, Alastair.
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