[wxqc] Pressure Frequency Analysis

[Victor Engel]

I see I need to clarify my use of the word spike. The spikes I
referred to were not meant to describe spikes in barometric pressure.
Rather, given a histogram of pressure cycle frequencies, I'm referring
to spikes in the histogram. The barometric curve should reflect these
spikes by having a sine wave component with wavelength matching the
number of hours I listed.

Why don't you think there should be a tidal effect on the atmosphere
resulting in measurable pressure differences?

Victor

On Dec 5, 2007 5:59 PM, Evan Bookbinder <Evan.Bookbinder at noaa.gov> wrote:
> Victor,
>
> I'm not sure why the moon or tides would have a modification on air
> pressure, so I would say this is more coincidence than a cause/effect.
> Spikes are the result of passing meteorological anomolies, causing an abrupt
> change in atmospheric pressure/density.
>
> Commons perturbations include:
> Frontal passages (cold fronts, warm fronts, drylines, sea breeze fronts,
> outflow boundaries)
> Thunderstorms
> Gravity waves
> Mountain waves
>
> I've had a long standing interest in barometry, and monitor mine on a daily
> basis. I have honestly never noticed any significant spikes which were not
> associated with accountable meteorological phenomena (and there's almost
> always some other change in temperature, dewpoint, or wind speed/direction).
>
>
> As for 12 and 24 hours...under benign weather conditions there's always a
> diurnal rise and fall associated with daytime heating/cooling, but this
> wouldn't be on the time scale of a "spike" as it's termed meteorologically.
>
> Evan
>
>
>
> > -----Original Message-----
> > From: wxqc-bounces at lists.gladstonefamily.net
> > [mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of
> > Victor Engel
> > Sent: Wednesday, December 05, 2007 5:40 PM
> > To: Discussion of weather data quality issues
> > Subject: [wxqc] Pressure Frequency Analysis
> >
> > Does anyone know of any research into barometric pressure
> > frequency analysis? Using my limited data set, it seems that
> > there are strong spikes at 12, 24, 91, 177, and 113 hours.
> > Beyond that timeframe, I think my dataset is insufficient to
> > discern anything relevant.
> >
> > The first two spikes are obviously tidal oscillations. The
> > 177 hour spike is probably a lunar tide component, since 177
> > hours is about 1/4 of a lunation. But I have no clue about
> > the others. Perhaps the atmosphere sloshes around at certain
> > resonent frequencies.
> >
> > Anyway, if anyone knows of papers on this subject, I'd be
> > very interested.
> >
> > Victor
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