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MJ MAHONEY (Michael.J.Mahoney@jpl.nasa.gov)
M/S 246-102; Jet Propulsion Laboratory; Pasadena, CA 91109-8099
DC-8 Microwave Temperature Profiler (MTP/DC8)
CAMEX-4
1 1
2001 08 25 2002 04 19 20010408 {FLT DATE, REDUCTION DATE & FLIGHT NUMBER}
0.0 0.0
Remote sensing altitude (meters)
Elapsed UT seconds from 0 hours on day given by DATE
4 {NV = number of primary variables: temp, SEtemp, Zg, #density}
1.0 1.0 1.0 1E+21 {scale factors for primary variables: temp, SEtemp, Zg, #density}
99999 9999 99999 99999 {missing values for primary variables: temp, SEtemp, Zg, #density}
Retrieved air temperature (K)
Standard error of retrieved air temperture (K)
Geometric altitude (meters).
Molecular air density (number per cubic meter)
12 {number of auxiliary variables}
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
99 99.999 99.9 99.9 999.9 99.9 99.9 999.9 999.9 99.999 999.999 999.9
NX(1) is the number of altitudes in subsequent data records
Pressure altitude of DC-8 (km)
Aircraft pitch (deg)
Aircraft roll (deg)
Horizon brightness temperature (ie, OAT, similar to SAT); avg ch1, ch2 & ch3 (K)
Tropopause #1 (km).
Tropopause #2 (km).
Potential temperature of tropopause #1 (K).
Potential temperature of tropopause #2 (K).
Latitude (deg)
Longitude (deg)
dT/dz (K/km) for 1.0 km layer centered on aircraft flight altitude.
6 {number of special comment lines}
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19 {number of normally included comment lines}
Here's a brief free-form tutorial on how to decipher the MTP data: Data groups
consist of the following group of lines per 15-second observing cycle.
First line is: UTSEC, number of retrieval levels in following table, Pressure
Altitude, Pitch, Roll, Outside air temp (K), tropopause altitude #1 (km),
tropopause altitude #2 (km) [if present], potential temperatures of tropopause
#1 and #2, latitude, longitude, & lapse rate near flight level.
The 1-liners (for each cycle) can be stripped & imported into a spreadsheet
for convenient plotting of trop altitude, lapse rate, etc. The tropopause
altitudes are calculated by cubic spline interpolation of the retrieved
altitudes using the WMO definition (that is, trop #1 is lowest altitude
where average lapse rate > -2 K/km from initial -2 K/km point to any point
within 2 km; trop #2 occurs above first trop after lapse rate is < -3K/km
for >1 km, and then first trop definition applies, possibly from within
the 1 km region.)
Remaining set of lines for each cycle consist of 5 columns: col#1 is pressure
altitude (meters), col#2 is temperature from MTP (Kelvin), col#3 is temperature
error estimate (K), col#4 is geometric altitude (meters), based on ICATS GPS
altitude (meters), and col#5 is molecular air density [1E+21/m3].
...
61653 0 10.046 2.6 -34.8 231.7 99.9 99.9 99.9 999.9 28.115 -80.088 99.9
61667 0 10.045 2.0 -28.2 231.7 99.9 99.9 99.9 999.9 28.095 -80.106 -7.6
61681 0 10.045 2.8 -26.2 231.7 99.9 99.9 99.9 999.9 28.070 -80.111 -7.6
61694 0 10.049 2.6 -25.4 231.5 99.9 99.9 99.9 999.9 28.045 -80.106 -7.6
61708 0 10.048 2.7 -25.2 231.7 99.9 99.9 99.9 999.9 28.025 -80.096 -7.6
61722 0 10.048 2.7 -24.0 231.7 99.9 99.9 99.9 999.9 28.006 -80.076 -7.6
61736 0 10.049 2.9 -23.9 232.0 99.9 99.9 99.9 999.9 27.995 -80.053 -7.6
61749 0 10.050 2.9 -24.3 232.2 99.9 99.9 99.9 999.9 27.990 -80.025 -7.6
61763 0 10.049 2.9 -23.8 232.2 99.9 99.9 99.9 999.9 27.993 -80.000 -7.8
61777 0 10.043 2.6 -14.2 232.2 99.9 99.9 99.9 999.9 28.001 -79.976 -8.0
61791 33 10.040 2.5 -3.9 232.5 14.9 99.9 370.4 999.9 28.015 -79.955 -7.8
28040 224.9 4.5 28289 507
24550 219.7 4.1 24779 887
21440 213.5 3.4 21709 1479
19040 207.3 2.8 19379 2222
16940 203.3 2.6 17379 3155
15240 202.4 2.3 15779 4144
14040 205.4 2.1 14649 4934
13240 208.7 2.0 13879 5509
12540 212.8 0.9 13199 6033
12040 216.5 0.9 12699 6418
11640 219.5 0.8 12289 6741
11340 221.9 0.8 11989 6994
11040 224.1 0.7 11679 7258
10740 226.5 0.7 11359 7528
10540 228.2 0.7 11159 7711
10340 229.7 0.6 10949 7900
10190 230.9 0.6 10789 8043
10040 232.1 0.6 10629 8189
9890 233.3 0.6 10479 8336
9740 234.4 0.6 10319 8488
9540 236.0 0.7 10109 8691
9340 237.6 0.7 9899 8896
9040 240.1 0.7 9589 9207
8740 242.6 0.7 9269 9528
8440 245.1 0.8 8949 9856
8040 248.3 0.8 8529 10312
7540 252.1 0.9 7999 10916
6840 257.0 0.9 7259 11827
6040 262.6 2.1 6409 12934
4940 269.6 2.6 5249 14630
3540 278.4 3.2 3769 17041
2040 286.7 4.1 2189 20053
540 296.5 4.8 599 23419
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