DATA REDUCTION FORMULAE TABLE

 

Reduced Data Items Computed for Greeley Project

Greeley, Colorado, July 21 – August 3, 2003 (see footnote *1)

 

 

 

# Values

 

 

Tag #

Description

Output

Units

Method of Computation

 

 

 

 

 

 

 

101

Dynamic Pressure #1

(20 Hz)

1       mb

6.30452E–3 * Raw – 0.0489

102

Dynamic Pressure #2

(20 Hz)

1       mb

5.28371E–3 * Raw – 1.5768

 

103

Static Pressure #1

(20 Hz)

1       mb

1.5791E–2 * Raw + 530.37

 

104

Static Pressure #2

(20 Hz)

1       mb

1.0917E–2 * Raw + 691.92

 

105

Rate of Climb

(20 Hz)

1       m/s

5.625E–4 * Raw, for Raw > = 0

 

 

 

 

 

5.287E–4 * Raw, for Raw < 0

 

106

Rosemount Temp

 

1       deg C

mach2 = 5*((l +dyn_pr/stat_pr)**(2/7)-l)

 

 

 

 

 

divisor = 1 + 0.195 * mach2

 

 

 

 

 

temp = (1.83105E-3 * Raw + 243.16)/divisor-273.16

 

107

Reverse Flow Temp

 

1       deg C

divisor = 1 + 0.1594 * mach2

 

 

 

 

 

temp = (3.02109E-3 * Raw + 222.06)/divisor-273.16

 

108

Manifold Pressure

 

1       " Hg

3.1098E-3 * Raw + 0.159275

 

109

Acceleration

(20 Hz)

1       g's

6.25E–5 * Raw [prior to 7/14/94]

 

 

 

 

 

6.25E–5 * Raw + 1.0 [after 7/14/94]

 

110

Pitch

(20 Hz)

1       deg

–3.05175E–3 * Raw + 50

 

111

Roll

(20 Hz)

1       deg

3.05175E–3 * Raw – 50

 

116

Voltage Regulator

 

1       volts

1.5258789E–4 * Raw

 

118

NCAR true air speed

 

1       m/s

3.96744E–3 * Raw

 

119

PMS End Element 1

 

1      volts

 

 

120

PMS End Element 2

 

1      volts

 

 

121

Interior Temp (computer)

 

1       deg C

3.05175E–2 * Raw

 

123

High Voltage Current

 

1      mA

1.5258789E-4 * Raw

 

124

Heater current

 

1       amp

3.05175E–3 * Raw

 

130

Event Code bits

 

1       flags

bit 0 = 1 --> system running

 

 

 

 

 

bit 1 = 0 -- > in cloud

 

 

 

 

 

bit 2 = 0 -- > foil on

 

131

GPS warning codes

 

1       flags

11 bit codes

 

140

FSSP counts

 

15     number

Raw

 

Text Box: 41141

FSSP total counts

 

1       number

Sum of tag 140s (tot_count)

 

142

FSSP ave diameter

 

1       mm

sum of diams / (tot_count)

*2

143

FSSP concentration

 

         cm3

vol = 0.22275 * tas  (volume sampling rate (m3/s))
(.22275 mm2 = sampling area)

*2

 

 

 

 

denom = 1 – .55 * activ / 100     (adjustment for probe activity)

 

 

 

 

1       #/cm3

conc = tot_count /vol / denom

 

 

FSSP total mass

 

         g

mass = sum of counts * volumes

*2

144

FSSP water

 

1       g/m3

water = mass / vol / denom * 1.E6

 

145

Probe Activity

 

1       %

Raw / 10

 

147

2DC Total Shadow Or

 

1      #/s

Raw

 

148

FSSP equivalent diameter

 

1       mm

Ratio of sum of diam **3 to sum of diam  **2

*2

149

FSSP equivalent diameter variance

 

1       mm

Consult listing or Appendix B (Data Dictionary)

*2

150

Hail size counts

 

1   #/s per channel

Raw

 

151

Slow Particle

 

1   #/s

Raw

 

152

Hail total counts

 

1       number

Sum of tag 150s (tot_counts)

 

153

Hail ave diameter

 

1       cm

sum of diams / tot_counts

 

154

Hail concentration

 

1       #/m3

conc = tot_counts / (0. 1 * tas) 

0.1 m2 = sampling area 

(0.1 * tas) = volume sampling rate (m3/s)

 

 

Hail total mass     

 

         g

mass = Si counti * volumei * 0.9 (0.9 g/cm3 = hail density)

 

155

Hail water

 

1       g/m3

water = mass / (0. 1 * tas)

 

160

Top field mill, low res

(20 Hz)