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Calculating Potential Vorticity of a Parcel of Air

  1. Oct 7, 2012 #1
    Hello,

    I am trying to calculate the potential vorticity (PV) in units (PVU) of thousands of different parcels of air on varying spatial and temporal scales. Variables available are as follows;

    parameter Unit Format Precision Default value :

    1 date yyyymmdd I8.8 0 99999999
    2 time hhmmss I6.6 0 999999
    3 latitude deg F6.2 0.01 -99.99
    4 longitude deg F7.2 0.01 -999.99
    5 baro altitude m F8.1 0.3 -99999.9
    6 radio altitude m F7.1 0.1 -9999.9
    7 pressure Pa I7 10 -999999
    8 A340. stat. temp. deg C F6.2 0.25 -99.99
    9 A340.air.speed m/s F7.2 0.01 -999.99
    10 A340.ground.speed m/s F7.2 0.01 -999.99
    11 wind direction deg F7.2 0.01 -999.99
    12 wind speed m/s F7.2 0.01 -999.99
    13 ozone mixing ratio ppbv I5 1 -9999
    14 static temp. deg C F5.1 0.1 -99.9
    15 Relative humidity % F6.1 0.1 -999.9
    16 RH validity 0,1,2,3 I2 0 9
    17 RH uncertainty % I3 1 -99
    18 H2O mixing ratio g/kg F7.3 0.01 -99.999
    19 CO mixing ratio ppbv F6.0 1 -9999.
    20 NOy mixing ratio ppbv F6.2 0.01 -99.99
    21 NO mixing ratio ppbv F6.2 0.01 -99.99
    22 NOx mixing ratio ppbv F6.2 0.01 -99.99
    23 NOy uncertainty ppbv F6.2 0.01 -99.99
    24 NOy validity 0-63 I2 0 -9

    Is it possible to calculate the potential vorticity of an individual air particle?

    Thank you in advance

    John
     
  2. jcsd
  3. Oct 7, 2012 #2
    What, please, is a potential vorticity?

    The two terms are used specifically in mutually exclusive circumstances.
     
  4. Oct 7, 2012 #3
    I am trying to uses potential vorticity (PV) as a meteorological tool to isolate Tropospheric airmass from those of stratospheric origin. Many papers discuss calculation of PV as a good technique for this.

    McIntyre (2012) describe PV as "the constancy on a fluid particle... central to stratified, rotating fluid dynamics". I think the idea is that there is the potential for creating vorticity at different latitudes where adiabatic variance in isentropically frictionless separated layers

    there is a potential for creating vorticity by changing latitude and by adiabatically
    changing the separation of isentropic layers.

    PV = g(-∂θ/∂p)ζ

    where g is gravity, ζ is the component of absolute vorticity normal to an isentropic surface, and -∂θ/∂p is the static stability.

    Does this answer your question?
     
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