UKMO Microphysics Data

The data are all in a simple ASCII format, and are presented as 5-second averages.

FSSP Data

For the FSSP measurements, the fields in each file are as indicated below. This instrument
has 15 bins, each of which has a radius width of 1.5 microns. The bin mid-point radii are
given in the table. 

PARAMETER	                                                UNITS   
-----------------------------------------------------------------------
AA  = UTC time                                                  HHMMSS
B1  = Particle concentration in bin centred at r= 1.75 microns   #/m3
B2  = Particle concentration in bin centred at r= 3.25 microns   #/m3
B3  = Particle concentration in bin centred at r= 4.75 microns   #/m3
B4  = Particle concentration in bin centred at r= 6.25 microns   #/m3
B5  = Particle concentration in bin centred at r= 7.75 microns   #/m3
B6  = Particle concentration in bin centred at r= 9.25 microns   #/m3
B7  = Particle concentration in bin centred at r=10.75 microns   #/m3
B8  = Particle concentration in bin centred at r=12.25 microns   #/m3
B9  = Particle concentration in bin centred at r=13.75 microns   #/m3
B10 = Particle concentration in bin centred at r=15.25 microns   #/m3
B11 = Particle concentration in bin centred at r=16.75 microns   #/m3
B12 = Particle concentration in bin centred at r=18.25 microns   #/m3
B13 = Particle concentration in bin centred at r=19.75 microns   #/m3
B14 = Particle concentration in bin centred at r=21.25 microns   #/m3
B15 = Particle concentration in bin centred at r=22.75 microns   #/m3
-----------------------------------------------------------------------
  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2
  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4
  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    2D Probe Data

    For the 2D probe measurements, the fields in each file are as described in the relevant file
    header. Spectra have been binned according to both particle projected area and mean diameter.

    2D-C data binned by mean diameter:

  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2
  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2
  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4
  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    2D-C data binned by projected area:

  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2
  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2
  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4
  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    2D-P data binned by mean diameter:

  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4

    2D-P data binned by projected area:

  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4

    Supplementary Data

    These files contain 5-second averaged data for pressure, height, temperature, dew-point,
    total water content, and distance from Chilbolton. The height is derived from the
    pressure, using the expression h=44.33077*(1.0-(p/p0)^0.19026), where h is in km, p is in
    hPa, and p0 is the surface pressure. For the values calculated in these files, we have
    used the average MSLP values from the Middle Wallop synoptic data for each flight period.
    Thus, the heights quoted here are heights above mean sea level.
  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2
  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2
  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4
  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    Quick-Looks of Raw 2D-C Images

    These PostScript files show randomly selected image blocks from the 2D-C probe.
    Note that no images were sampled during runs 5.1 and 5.2 on 13 October.
  • 07 October 1998, Run 5.1, #1
  • 07 October 1998, Run 5.1, #2
  • 07 October 1998, Run 5.1, #3
  • 07 October 1998, Run 5.1, #4
  • 07 October 1998, Run 5.1, #5
  • 07 October 1998, Run 5.1, #6
  • 07 October 1998, Run 5.1, #7
  • 07 October 1998, Run 5.1, #8
  • 07 October 1998, Run 5.1, #9
  • 07 October 1998, Run 5.1, #10
  • 07 October 1998, Run 5.2, #1
  • 07 October 1998, Run 5.2, #2
  • 07 October 1998, Run 5.2, #3
  • 07 October 1998, Run 5.2, #4
  • 07 October 1998, Run 5.2, #5
  • 07 October 1998, Run 5.2, #6
  • 07 October 1998, Run 5.2, #7
  • 07 October 1998, Run 5.2, #8
  • 07 October 1998, Run 5.2, #9
  • 07 October 1998, Run 5.2, #10
  • 20 October 1998, Run 9.1, #1
  • 20 October 1998, Run 9.1, #2
  • 20 October 1998, Run 9.1, #3
  • 20 October 1998, Run 9.1, #4
  • 20 October 1998, Run 9.1, #5
  • 20 October 1998, Run 9.1, #6
  • 20 October 1998, Run 9.1, #7
  • 20 October 1998, Run 9.1, #8
  • 20 October 1998, Run 9.1, #9
  • 20 October 1998, Run 9.1, #10
  • 20 October 1998, Run 9.2, #1
  • 20 October 1998, Run 9.2, #2
  • 20 October 1998, Run 9.2, #3
  • 20 October 1998, Run 9.2, #4
  • 20 October 1998, Run 9.2, #5
  • 20 October 1998, Run 9.2, #6
  • 20 October 1998, Run 9.2, #7
  • 20 October 1998, Run 9.2, #8
  • 20 October 1998, Run 9.2, #9
  • 20 October 1998, Run 9.2, #10
  • 20 October 1998, Run 10.1, #1
  • 20 October 1998, Run 10.1, #2
  • 20 October 1998, Run 10.1, #3
  • 20 October 1998, Run 10.1, #4
  • 20 October 1998, Run 10.1, #5
  • 20 October 1998, Run 10.1, #6
  • 20 October 1998, Run 10.1, #7
  • 20 October 1998, Run 10.1, #8
  • 20 October 1998, Run 10.1, #9
  • 20 October 1998, Run 10.1, #10
  • 20 October 1998, Run 10.2, #1
  • 20 October 1998, Run 10.2, #2
  • 20 October 1998, Run 10.2, #3
  • 20 October 1998, Run 10.2, #4
  • 20 October 1998, Run 10.2, #5
  • 20 October 1998, Run 10.2, #6
  • 20 October 1998, Run 10.2, #7
  • 20 October 1998, Run 10.2, #8
  • 20 October 1998, Run 10.2, #9
  • 20 October 1998, Run 10.2, #10
  • 20 October 1998, Run 11.1, #1
  • 20 October 1998, Run 11.1, #2
  • 20 October 1998, Run 11.1, #3
  • 20 October 1998, Run 11.1, #4
  • 20 October 1998, Run 11.1, #5
  • 20 October 1998, Run 11.1, #6
  • 20 October 1998, Run 11.1, #7
  • 20 October 1998, Run 11.1, #8
  • 20 October 1998, Run 11.1, #9
  • 20 October 1998, Run 11.1, #10
  • 20 October 1998, Run 11.2, #1
  • 20 October 1998, Run 11.2, #2
  • 20 October 1998, Run 11.2, #3
  • 20 October 1998, Run 11.2, #4
  • 20 October 1998, Run 11.2, #5
  • 20 October 1998, Run 11.2, #6
  • 20 October 1998, Run 11.2, #7
  • 20 October 1998, Run 11.2, #8
  • 20 October 1998, Run 11.2, #9
  • 20 October 1998, Run 11.2, #10
  • 21 October 1998, Run 2.1, #1
  • 21 October 1998, Run 2.1, #2
  • 21 October 1998, Run 2.1, #3
  • 21 October 1998, Run 2.1, #4
  • 21 October 1998, Run 2.1, #5
  • 21 October 1998, Run 2.1, #6
  • 21 October 1998, Run 2.1, #7
  • 21 October 1998, Run 2.1, #8
  • 21 October 1998, Run 2.1, #9
  • 21 October 1998, Run 2.1, #10
  • 21 October 1998, Run 2.2, #1
  • 21 October 1998, Run 2.2, #2
  • 21 October 1998, Run 2.2, #3
  • 21 October 1998, Run 2.2, #4
  • 21 October 1998, Run 2.2, #5
  • 21 October 1998, Run 2.2, #6
  • 21 October 1998, Run 2.2, #7
  • 21 October 1998, Run 2.2, #8
  • 21 October 1998, Run 2.2, #9
  • 21 October 1998, Run 2.2, #10
  • 21 October 1998, Run 2.3, #1
  • 21 October 1998, Run 2.3, #2
  • 21 October 1998, Run 2.3, #3
  • 21 October 1998, Run 2.3, #4
  • 21 October 1998, Run 2.3, #5
  • 21 October 1998, Run 2.3, #6
  • 21 October 1998, Run 2.3, #7
  • 21 October 1998, Run 2.3, #8
  • 21 October 1998, Run 2.3, #9
  • 21 October 1998, Run 2.3, #10
  • 21 October 1998, Run 2.4, #1
  • 21 October 1998, Run 2.4, #2
  • 21 October 1998, Run 2.4, #3
  • 21 October 1998, Run 2.4, #4
  • 21 October 1998, Run 2.4, #5
  • 21 October 1998, Run 2.4, #6
  • 21 October 1998, Run 2.4, #7
  • 21 October 1998, Run 2.4, #8
  • 21 October 1998, Run 2.4, #9
  • 21 October 1998, Run 2.4, #10

    Quick-Looks of Raw 2D-P Images

    These PostScript files show randomly selected image blocks from the 2D-P probe for
    the 20 October and 21 October flights, where numbers of larger particles were observed.
  • 20 October 1998, Run 9.1, #1
  • 20 October 1998, Run 9.1, #2
  • 20 October 1998, Run 9.1, #3
  • 20 October 1998, Run 9.1, #4
  • 20 October 1998, Run 9.1, #5
  • 20 October 1998, Run 9.1, #6
  • 20 October 1998, Run 9.1, #7
  • 20 October 1998, Run 9.1, #8
  • 20 October 1998, Run 9.1, #9
  • 20 October 1998, Run 9.1, #10
  • 20 October 1998, Run 9.2, #1
  • 20 October 1998, Run 9.2, #2
  • 20 October 1998, Run 9.2, #3
  • 20 October 1998, Run 9.2, #4
  • 20 October 1998, Run 9.2, #5
  • 20 October 1998, Run 9.2, #6
  • 20 October 1998, Run 9.2, #7
  • 20 October 1998, Run 9.2, #8
  • 20 October 1998, Run 9.2, #9
  • 20 October 1998, Run 9.2, #10
  • 20 October 1998, Run 10.1, #1
  • 20 October 1998, Run 10.1, #2
  • 20 October 1998, Run 10.1, #3
  • 20 October 1998, Run 10.1, #4
  • 20 October 1998, Run 10.1, #5
  • 20 October 1998, Run 10.1, #6
  • 20 October 1998, Run 10.1, #7
  • 20 October 1998, Run 10.1, #8
  • 20 October 1998, Run 10.1, #9
  • 20 October 1998, Run 10.1, #10
  • 20 October 1998, Run 10.2, #1
  • 20 October 1998, Run 10.2, #2
  • 20 October 1998, Run 10.2, #3
  • 20 October 1998, Run 10.2, #4
  • 20 October 1998, Run 10.2, #5
  • 20 October 1998, Run 10.2, #6
  • 20 October 1998, Run 10.2, #7
  • 20 October 1998, Run 10.2, #8
  • 20 October 1998, Run 10.2, #9
  • 20 October 1998, Run 10.2, #10
  • 20 October 1998, Run 11.1, #1
  • 20 October 1998, Run 11.1, #2
  • 20 October 1998, Run 11.1, #3
  • 20 October 1998, Run 11.1, #4
  • 20 October 1998, Run 11.1, #5
  • 20 October 1998, Run 11.1, #6
  • 20 October 1998, Run 11.1, #7
  • 20 October 1998, Run 11.1, #8
  • 20 October 1998, Run 11.1, #9
  • 20 October 1998, Run 11.1, #10
  • 20 October 1998, Run 11.2, #1
  • 20 October 1998, Run 11.2, #2
  • 20 October 1998, Run 11.2, #3
  • 20 October 1998, Run 11.2, #4
  • 20 October 1998, Run 11.2, #5
  • 20 October 1998, Run 11.2, #6
  • 20 October 1998, Run 11.2, #7
  • 20 October 1998, Run 11.2, #8
  • 20 October 1998, Run 11.2, #9
  • 20 October 1998, Run 11.2, #10
  • 21 October 1998, Run 2.1, #1
  • 21 October 1998, Run 2.1, #2
  • 21 October 1998, Run 2.1, #3
  • 21 October 1998, Run 2.1, #4
  • 21 October 1998, Run 2.1, #5
  • 21 October 1998, Run 2.1, #6
  • 21 October 1998, Run 2.1, #7
  • 21 October 1998, Run 2.1, #8
  • 21 October 1998, Run 2.1, #9
  • 21 October 1998, Run 2.1, #10
  • 21 October 1998, Run 2.2, #1
  • 21 October 1998, Run 2.2, #2
  • 21 October 1998, Run 2.2, #3
  • 21 October 1998, Run 2.2, #4
  • 21 October 1998, Run 2.2, #5
  • 21 October 1998, Run 2.2, #6
  • 21 October 1998, Run 2.2, #7
  • 21 October 1998, Run 2.2, #8
  • 21 October 1998, Run 2.2, #9
  • 21 October 1998, Run 2.2, #10
  • 21 October 1998, Run 2.3, #1
  • 21 October 1998, Run 2.3, #2
  • 21 October 1998, Run 2.3, #3
  • 21 October 1998, Run 2.3, #4
  • 21 October 1998, Run 2.3, #5
  • 21 October 1998, Run 2.3, #6
  • 21 October 1998, Run 2.3, #7
  • 21 October 1998, Run 2.3, #8
  • 21 October 1998, Run 2.3, #9
  • 21 October 1998, Run 2.3, #10
  • 21 October 1998, Run 2.4, #1
  • 21 October 1998, Run 2.4, #2
  • 21 October 1998, Run 2.4, #3
  • 21 October 1998, Run 2.4, #4
  • 21 October 1998, Run 2.4, #5
  • 21 October 1998, Run 2.4, #6
  • 21 October 1998, Run 2.4, #7
  • 21 October 1998, Run 2.4, #8
  • 21 October 1998, Run 2.4, #9
  • 21 October 1998, Run 2.4, #10

    Further Analysis for 07 October 1998 Case Study

    For runs 5.1 and 5.2, the runs selected for detailed analysis, there were no indications
    of any ice in the 2D probe measurements; the cloud appears to have been entirely
    super-cooled liquid water, at least for the runs at this level.

    Files containing merged FSSP and 2D-C spectra are presented below, together with files
    containing the integrated quantities of liquid water content and effective radius
    from these merged spectra. Significant discrepancies existed between the liquid water
    contents derived from the raw spectra and independent measurements from the Johnson-Williams
    instrument. The FSSP is known to under-read in conditions such as in the present case,
    where the size distribution is very heavily weighted towards small droplets. Because of this,
    we have adjusted the raw FSSP concentrations such that the liquid water contents from the merged
    spectra agree with those from the Johnson-Williams.

    For the merged spectra, the bin sizes are as indicated below. Note that the concentrations
    are now in units of #/m3/micron. i.e. the droplet concentration per unit radius.
    
 BIN    BIN RADIUS MIN    BIN RADIUS MID    BIN RADIUS MAX
          (MICRONS)         (MICRONS)         (MICRONS)
-----------------------------------------------------------
  1        1.00000           1.75000           2.50000
  2        2.50000           3.25000           4.00000
  3        4.00000           4.75000           5.50000
  4        5.50000           6.25000           7.00000
  5        7.00000           7.75000           8.50000
  6        8.50000           9.25000           10.0000
  7        10.0000           10.7500           11.5000
  8        11.5000           12.2500           13.0000
  9        13.0000           13.7500           14.5000
 10        14.5000           15.2500           16.0000
 11        16.0000           16.7500           17.5000
 12        17.5000           18.2500           19.0000
 13        19.0000           19.7500           20.5000
 14        20.5000           21.2500           22.0000
 15        22.0000           22.7500           23.5000
 16        23.5000           27.3750           31.2500
 17        31.2500           37.5000           43.7500
 18        43.7500           50.0000           56.2500
 19        56.2500           62.5000           68.7500
 20        68.7500           75.0000           81.2500
 21        81.2500           87.5000           93.7500
 22        93.7500           100.000           106.250
 23        106.250           112.500           118.750
 24        118.750           125.000           131.250
 25        131.250           137.500           143.750
 26        143.750           150.000           156.250
 27        156.250           162.500           168.750
 28        168.750           175.000           181.250
 29        181.250           187.500           193.750
 30        193.750           200.000           206.250
 31        206.250           212.500           218.750
 32        218.750           225.000           231.250
 33        231.250           237.500           243.750
 34        243.750           250.000           256.250
 35        256.250           262.500           268.750
 36        268.750           275.000           281.250
 37        281.250           287.500           293.750
 38        293.750           300.000           306.250
 39        306.250           312.500           318.750
 40        318.750           325.000           331.250
 41        331.250           337.500           343.750
 42        343.750           350.000           356.250
 43        356.250           362.500           368.750
 44        368.750           375.000           381.250
 45        381.250           387.500           393.750
 46        393.750           400.000           406.250
-----------------------------------------------------------

    Johnson-Williams Data:

  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2

    Merged Spectra:

  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2

    Integrated Liquid Water Content and Effective Radius:

  • 07 October 1998, Run 1.1
  • 07 October 1998, Run 1.2
  • 07 October 1998, Run 3.1
  • 07 October 1998, Run 3.2
  • 07 October 1998, Run 4.1
  • 07 October 1998, Run 4.2
  • 07 October 1998, Run 5.1
  • 07 October 1998, Run 5.2
  • 07 October 1998, Run 6.1
  • 07 October 1998, Run 6.2
  • 07 October 1998, Run 7.1
  • 07 October 1998, Run 7.2

    Quick Look Plots:

  • LWC time series, Run 1.1
  • LWC time series, Run 1.2
  • LWC time series, Run 5.1
  • LWC time series, Run 5.2
  • LWC time series, Run 6.1
  • LWC time series, Run 6.2
  • LWC time series, Run 7.1
  • LWC time series, Run 7.2
  • Effective radius time series, Run 1.1
  • Effective radius time series, Run 1.2
  • Effective radius time series, Run 5.1
  • Effective radius time series, Run 5.2
  • Effective radius time series, Run 6.1
  • Effective radius time series, Run 6.2
  • Effective radius time series, Run 7.1
  • Effective radius time series, Run 7.2

    Further Analysis for 13 October 1998 Case Study

    For runs 5.1 and 5.2, no images were recorded on either of the 2D probes. Files
    containing corrected FSSP spectra are presented below, together with files containing
    the integrated quantities of liquid water content and effective radius from these
    spectra. As with the 07 October case described above, we have adjusted the raw
    FSSP concentrations such that the liquid water contents from the FSSP spectra agree
    with those from the Johnson-Williams probe. The bin sizes and units are as
    indicated for the merged spectra from 07 October 1998 shown above.

    Johnson-Williams Data:

  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2

    Corrected FSSP Spectra:

  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2

    Integrated Liquid Water Content and Effective Radius:

  • 13 October 1998, Run 3.1
  • 13 October 1998, Run 3.2
  • 13 October 1998, Run 4.1
  • 13 October 1998, Run 4.2
  • 13 October 1998, Run 5.1
  • 13 October 1998, Run 5.2
  • 13 October 1998, Run 6.1
  • 13 October 1998, Run 6.2
  • 13 October 1998, Run 7.1
  • 13 October 1998, Run 7.2

    Quick Look Plots:

  • LWC time series, Run 5.1
  • LWC time series, Run 5.2
  • Effective radius time series, Run 5.1
  • Effective radius time series, Run 5.2

    Further Analysis for 14 October 1998 Case Study

    Files containing spectra merged from the 2D-C and 2D-P probes are presented below. Again,
    diameter-binned and area-binned spectra have both been included. No 2D-P images were
    recorded for runs 8.1 and 8.2, so these spectra are purely 2D-C. The bin sizes and units
    are given in each file header. Also included are files containing the integrated
    quantities of ice water content and effective radius. Ice water content has been
    calculated in two ways; the first, based on the Brown and Francis (1995, JAOT) paper, uses
    the spectra binned by mean diameter (denoted by IWCD, and plotted as the green line in the
    quick-look plots), whilst the second, based on the work presented in the Appendix of
    Francis et al. (1998, QJRMS), uses spectra binned by projected area (denoted by IWCA, and
    plotted as the red line in the quick-looks). Good agreement exists between these two sets
    of values. Also tabulated are values for effective radius. The definition is that of Foot
    (1988), and is also discussed in the Francis et al. (1998) paper. Because the ice water
    content is itself used in the definition, two different values of effective radius are
    given, one for each of the above methods. The same colour scheme as above is used for the
    quick-look plots.

    Also included are some water contents categorized by ice crystal habit, derived by
    applying an automatic particle recognition algorithm to the 2D probe data. The habits used
    are columns, aggregates, graupel and unclassified (i.e. particle too small), together with
    a category for liquid water droplets. In the quick-look plots, columns are shown as red,
    aggregates as green, graupel as magenta, unclassified as black, and liquid water droplets
    as blue.

    Merged 2D-C and 2D-P Spectra:

    Binned by mean diameter:
  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2
    Binned by projected area:
  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2

    Ice Water Content and Effective Radius:

  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2

    Water Contents Classified by Habit from 2D Probe Data:

  • 14 October 1998, Run 6.2, Ice
  • 14 October 1998, Run 6.2, Water
  • 14 October 1998, Run 7.1, Ice
  • 14 October 1998, Run 7.1, Water
  • 14 October 1998, Run 7.2, Ice
  • 14 October 1998, Run 7.2, Water
  • 14 October 1998, Run 8.1, Ice
  • 14 October 1998, Run 8.1, Water
  • 14 October 1998, Run 8.2, Ice
  • 14 October 1998, Run 8.2, Water

    Johnson-Williams Liquid Water Content Data:

  • 14 October 1998, Run 6.2
  • 14 October 1998, Run 7.1
  • 14 October 1998, Run 7.2
  • 14 October 1998, Run 8.1
  • 14 October 1998, Run 8.2

    Quick Look Plots:

  • IWCD/IWCA time series, Run 6.2
  • IWCD/IWCA time series, Run 7.1
  • IWCD/IWCA time series, Run 7.2
  • IWCD/IWCA time series, Run 8.1
  • IWCD/IWCA time series, Run 8.2
  • IWC habit time series, Run 6.2
  • IWC habit time series, Run 7.1
  • IWC habit time series, Run 7.2
  • IWC habit time series, Run 8.1
  • IWC habit time series, Run 8.2
  • Effective radius time series, Run 6.2
  • Effective radius time series, Run 7.1
  • Effective radius time series, Run 7.2
  • Effective radius time series, Run 8.1
  • Effective radius time series, Run 8.2
  • J/W liquid water content time series, Run 6.2
  • J/W liquid water content time series, Run 7.1
  • J/W liquid water content time series, Run 7.2
  • J/W liquid water content time series, Run 8.1
  • J/W liquid water content time series, Run 8.2

    Further Analysis for 20 October 1998 Case Study

    Files containing spectra merged from the 2D-C and 2D-P probes are presented below. As
    with the 14 October case above, diameter-binned and area-binned spectra have both been
    included. The bin sizes and units are given in each file header. Also included are files
    containing the integrated quantities of ice water content and effective radius, assuming
    that no liquid water is present. The ice water content has been calculated in the two
    ways described above. However, for many of the runs on this flight, significant
    discrepancies exist between the two methods. These discrepancies seem to be most marked
    in regions where there are a lot of very large crystals. As an example, look at the
    PostScript files of the 2D-P images from run 11.1; image block #6 shows large numbers of
    crystals with sizes around 2 to 3 mm. The size-to-mass relationships implicit in the two
    ice water content methods are clearly diverging at large sizes for these particular
    crystal habits. More work will be required to establish if it is possible to improve our
    estimates of ice mass for these runs. As above, two values of effective radius are also
    tabulated, although these obviously tend diverge in much the same way as the values of
    ice water content.

    Also included are some water contents categorized by ice crystal habit, derived by
    applying an automatic particle recognition algorithm to the 2D probe data. The habits used
    are columns, aggregates, graupel and unclassified (i.e. particle too small), together with
    a category for liquid water droplets. In the quick-look plots, columns are shown as red,
    aggregates as green, graupel as magenta, unclassified as black, and liquid water droplets
    as blue.

    Merged 2D-C and 2D-P Spectra:

    Binned by mean diameter:
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2
    Binned by projected area:
  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2

    Ice Water Content and Effective Radius:

  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2

    Water Contents Classified by Habit from 2D Probe Data:

  • 20 October 1998, Run 9.1, Ice
  • 20 October 1998, Run 9.1, Water
  • 20 October 1998, Run 9.2, Ice
  • 20 October 1998, Run 9.2, Water
  • 20 October 1998, Run 10.1, Ice
  • 20 October 1998, Run 10.1, Water
  • 20 October 1998, Run 10.2, Ice
  • 20 October 1998, Run 10.2, Water
  • 20 October 1998, Run 11.1, Ice
  • 20 October 1998, Run 11.1, Water
  • 20 October 1998, Run 11.2, Ice
  • 20 October 1998, Run 11.2, Water

    Johnson-Williams Liquid Water Content Data:

  • 20 October 1998, Run 9.1
  • 20 October 1998, Run 9.2
  • 20 October 1998, Run 10.1
  • 20 October 1998, Run 10.2
  • 20 October 1998, Run 11.1
  • 20 October 1998, Run 11.2

    Quick Look Plots:

  • IWCD/IWCA time series, Run 9.1
  • IWCD/IWCA time series, Run 9.2
  • IWCD/IWCA time series, Run 10.1
  • IWCD/IWCA time series, Run 10.2
  • IWCD/IWCA time series, Run 11.1
  • IWCD/IWCA time series, Run 11.2
  • IWC habit time series, Run 9.1
  • IWC habit time series, Run 9.2
  • IWC habit time series, Run 10.1
  • IWC habit time series, Run 10.2
  • IWC habit time series, Run 11.1
  • IWC habit time series, Run 11.2
  • Effective radius time series, Run 9.1
  • Effective radius time series, Run 9.2
  • Effective radius time series, Run 10.1
  • Effective radius time series, Run 10.2
  • Effective radius time series, Run 11.1
  • Effective radius time series, Run 11.2
  • J/W liquid water content time series, Run 9.1
  • J/W liquid water content time series, Run 9.2
  • J/W liquid water content time series, Run 10.1
  • J/W liquid water content time series, Run 10.2
  • J/W liquid water content time series, Run 11.1
  • J/W liquid water content time series, Run 11.2

    Further Analysis for 21 October 1998 Case Study

    Files containing spectra merged from the 2D-C and 2D-P probes are presented below. As
    above, diameter-binned and area-binned spectra have both been included. The bin sizes and
    units are given in each file header. Also included are files containing the integrated
    quantities of ice water content and effective radius, assuming that no liquid water is
    present.

    Also included are some water contents categorized by ice crystal habit, derived by
    applying an automatic particle recognition algorithm to the 2D probe data. The habits used
    are columns, aggregates, graupel and unclassified (i.e. particle too small), together with
    a category for liquid water droplets. In the quick-look plots, columns are shown as red,
    aggregates as green, graupel as magenta, unclassified as black, and liquid water droplets
    as blue.

    Merged 2D-C and 2D-P Spectra:

    Binned by mean diameter:
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4
    Binned by projected area:
  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4

    Ice Water Content and Effective Radius:

  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4

    Water Contents Classified by Habit from 2D Probe Data:

  • 21 October 1998, Run 2.1, Ice
  • 21 October 1998, Run 2.1, Water
  • 21 October 1998, Run 2.2, Ice
  • 21 October 1998, Run 2.2, Water
  • 21 October 1998, Run 2.3, Ice
  • 21 October 1998, Run 2.3, Water
  • 21 October 1998, Run 2.4, Ice
  • 21 October 1998, Run 2.4, Water

    Johnson-Williams Liquid Water Content Data:

  • 21 October 1998, Run 2.1
  • 21 October 1998, Run 2.2
  • 21 October 1998, Run 2.3
  • 21 October 1998, Run 2.4

    Quick Look Plots:

  • IWCD/IWCA time series, Run 2.1
  • IWCD/IWCA time series, Run 2.2
  • IWCD/IWCA time series, Run 2.3
  • IWCD/IWCA time series, Run 2.4
  • IWC habit time series, Run 2.1
  • IWC habit time series, Run 2.2
  • IWC habit time series, Run 2.3
  • IWC habit time series, Run 2.4
  • Effective radius time series, Run 2.1
  • Effective radius time series, Run 2.2
  • Effective radius time series, Run 2.3
  • Effective radius time series, Run 2.4
  • J/W liquid water content time series, Run 2.1
  • J/W liquid water content time series, Run 2.2
  • J/W liquid water content time series, Run 2.3
  • J/W liquid water content time series, Run 2.4

    Further Analysis for 22 October 1998 Case Study

    Johnson-Williams Data:

  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    Merged Spectra:

  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    Integrated Liquid Water Content and Effective Radius:

  • 22 October 1998, Run 1.1
  • 22 October 1998, Profile 1

    Quick Look Plots:

  • LWC time series, Run 1.1
  • LWC time series, Profile 1
  • Effective radius time series, Run 1.1
  • Effective radius time series, Profile 1 Last Modified: 12th August 1999, Pete Francis, UKMO.