As part of the dry-season 2000 intensive campaign of SAFARI 2000, the South African Weather Bureau Aerocommander, JRA, flew a total of thirty-nine flights between August 15 and September 24, 2000. Working closely with the other Aerocommander, JRB (Piketh et al., 2004), JRA was dedicated to the measurement of cloud condensation nuclei (CCN), trace gas, and aerosol properties. A suite of trace analyzers (for O3, SO2, and CO), optical aerosol probes, and atmospheric probes was present for all flights. JRA operated out of Pietersburg, Republic of South Africa, from August 15 until September 11, when the JRA base of operations was relocated to Kasane, Botswana.
The data described here include all data collected on the aircraft Data Acquisition System. This is Version 3 (October 2002).
Data collected using other systems can be obtained directly from the responsible investigators. Their contact information is included in the companion file [ https://daac.ornl.gov/daacdata/safari2k/atmospheric/SAWB_JRA/comp/jra_jrb_trace_gas_companion.pdf] .
The data files are organized and named by aircraft, date, and daily flight number. The data are stored as ASCII files in comma-separated-value format.
Cite this data set as follows:
Piketh, S. J., T. Elias, and D. C. Stein. 2004. SAFARI 2000 JRA Aerocommander Trace Gas, Aerosol, and CCN Data, Dry Season 2000. ORNL DAAC, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/713.
Annegarn, H. J., L. Otter, R. J. Swap, and R. J. Scholes. 2002. Southern Africa's ecosystem in a test tube: A perspective on the Southern African Regional Science Initiative. South African Journal of Science 98: 111-113.
Piketh, S. J., T. Elias, and D. C. Stein. 2004. SAFARI 2000 JRB Aerocommander Trace Gas and Aerosol Data, Dry Season 2000. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Swap, R. J., H. J. Annegarn, and L. B. Otter. 2002. Southern African Regional Science Initiative (SAFARI 2000): Condensed Science Plan. South African Journal of Science 98: 119-124.
Swap, R. J., H. J. Annegarn, J. T. Suttles, J. Haywood, J., M. Helmlinger, C. Hely, P. V. Hobbs, B. N. Holben, J. Ji, J., M. King, T. Landmann, W. Maenhaut, L. Otter, B. Pak, S. J. Piketh, S. Platnick, J. Privette, D. Roy, A. M. Thompson, D. Ward, and R. Yokelson. 2002. The Southern African Regional Science Initiative (SAFARI 2000): Dry-Season Field Campaign: An Overview. South African Journal of Science 98: 125-130.
The data files contain measurements of trace gas, aerosol properties, and CNN measurements collected from the JRA aircraft. The files are organized and named by aircraft, date, and daily flight number. For example, data file a0000815_1.dat contains data collected on the first flight of the JRA aircraft on August 15, 2000. The data are stored as ASCII files in comma-separated-value format.
The reported values are ten-second averages. All parameters were originally recorded on the aircraft Data Acquisition System with a temporal resolution of 1 Hz (i.e., Data acquisition mode -> 0 = 1Hz ). No measures of uncertainty are provided (e.g., standard deviation). The average speed of the aircraft during data collection was 100 m s-1. Data have been processed and corrected.
The data described here include all data collected on the aircraft Data Acquisition System. Data collected using other systems can be obtained directly from the respective investigators.
Data file column headings, units, missing value codes, and variable descriptions.
VARIABLE
UNITS
MISSING DATA
LONGNAME
DATE
UTC
-999
Study date (dd-mm-yyyy)
TIME
UTC
-999
Study time (hh:mm:ss)
mode
none
-999
Data acquisition mode -> 0 = 1Hz and 1 => 10Hz
GLAT
deg_east
-999
GPS latitude (decimal degrees)
GLON
deg_west
-999
GPS longitude (decimal degrees)
GDATE
UTC
-999
GPS date (ddmmyy)
GTIME
UTC
-999
GPS time (hhmmss)
GSPD
m/s
-999
GPS ground speed
GHEAD
deg
-999
GPS heading
GSTAT
none
-999
GPS status
ATBR
degC
-999
Ambient Temperature
RHUM
%
-999
Vaisala humidity
PSBC
hPa
-999
Corrected Static Pressure
TAS
m/s
-999
Derived True Air Speed
ATBF
degC
-999
Ambient Temperature
TAS1
m/s
-999
Derived True Air Speed
GALT
m
-999
NACA Pressure Altitude
ALTF
feet
-999
NACA Pressure Altitude
THETA
K
-999
Potential Temperature
THETAE
K
-999
Equivalent Potential Temperature
THETAV
K
-999
Virtual Potential Temperature
SPHUM
g/kg
-999
Specific Humidity
MR
g/cm^3
-999
Mixing Ratio
RHO
g/cm^3)
-999
Absolute humidity (Vapour Density)
TDEW
degC
-999
Dewpoint Temperature
TVIR
K
-999
Virtual Temperature
CCNLP mAmp -999 CCN_laser_power CCNTT degC -999 CCN_top_temperature CCNDT degC -999 CCN_deferential_temperature CCNSTAT V -999 CCN_status CCNSIG V -999 CCN_signal_voltage CCNZC cm^3 -999 CCN calculated concentration lag corrected CCNZSS % -999 CCN calculated supersaturation CCNZF binary -999 CCN saturation flag CCNC cm^3 -999 CCN calculated concentration CCNSS % -999 CCN calculated supersaturation CCNF binary -999 CCN saturation flag NEPH Scat -999 Nepholometer_scattering_coeff FCN slpm -999 CN_SampleFlow PCN hPa -999 CN_Counter_pressure PCBADS degC -999 CN_Temp XICN slpm -999 CN_side_flow CN cnts -999 CN_digital_counter WRAPCN cnts -999 CN_digital_wrap_counter CNC cm^3 -999 CN corrected concentration FCNC vlpm -999 CN corrected flow XICNC vlpm -999 CN corrected side flow PRNG_LWO
none
-999
PCASP-100X range
DBARP_LWO
uM
-999
PCAS-100 mean particle diameter
DISPP_LWO
none
-999
PCAS-100 dispersion (sigma/dbarx)
CONCP_LWO
#/cm^3
-999
PCAS-100 total concentration
CPCAS_LWO_(1-15)
#/cm^3/uM_ival
-999
PCAS-100 corrected concentration
FRNG_LWI
none
-999
FSSP-100 range
CONCF_LWI
#/cm^3
-999
FSSP-100 total concentration
DBARF_LWI
uM
-999
FSSP-100 mean particle diameter
DISPF_LWI
none
-999
FSSP-100 dispersion (sigma/dbarx)
LWCF_LWI
g/cm^3
-999
FSSP-100 Liquid Water Content
CFSSP_LWI_(1-15)
#/cm^3/uM_ival
-999
FSSP-100 corrected concentration
SO2
PPB
-999
S02_Concentration
O3
PPB
-999
O3
CO
PPB
-999
CO_signal
NO
PPB
-999
NO_signal
SO2C
PPB
-999
SO2 Altitude Corrected Concentration
O3C
PPB
-999
O3 Altitude Corrected Concentration
COC
PPB
-999
CO Altitude Corrected Concentration
NOC
PPB
-999
NO Altitude Corrected Concentration
Table Notes:
The probe variables have extensions. These indicate the position where the probe was mounted.
The following extensions are used:
LWO -> Left Wing Outboard
LWI -> Left Wing Inboard
The variable 'CPCAS_LWO' has 15 particle concentration values corresponding to a size bin.
This PCASP instrument operated in only one range.
Lower and upper particle site limits (micrometers) for 'CPCAS_LWO' size bins.
Size Bin
Lower Limit (um)
Upper Limit (um)
1
0.10
0.12
2
0.12
0.14
3
0.14
0.17
4
0.17
0.20
5
0.20
0.25
6
0.25
0.30
7
0.30
0.40
8
0.40
0.50
9
0.50
0.70
10
0.70
0.90
11
0.90
1.20
12
1.20
1.50
13
1.50
2.00
14
2.00
2.50
15
2.50
3.00
The variable 'CFSSP_LWI' has 15 values corresponding to a size bin.
The different instrument operating range values of 'FRNG_LWI' will determine the bin size limits.
Lower and upper particle site limits (micrometers) for 'CFSSP_LWI' size bins for instrument operating ranges.
Range 0
Range 1
Range 2
Range 3
Size Bin
Lower Limit (um)
Upper Limit (um)
Lower Limit (um)
Upper Limit (um)
Lower Limit (um)
Upper Limit (um)
Lower Limit (um)
Upper Limit (um)
1
2.00
5.00
2.00
4.00
1.00
2.00
0.50
1.00
2
5.00
8.00
4.00
6.00
2.00
3.00
1.00
1.50
3
8.00
11.00
6.00
8.00
3.00
4.00
1.50
2.00
4
11.00
14.00
8.00
10.00
4.00
5.00
2.00
2.50
5
14.00
17.00
10.00
12.00
5.00
6.00
2.50
3.00
6
17.00
20.00
12.00
14.00
6.00
7.00
3.00
3.50
7
20.00
23.00
14.00
16.00
7.00
8.00
3.50
4.00
8
23.00
26.00
16.00
18.00
8.00
9.00
4.00
4.50
9
26.00
29.00
18.00
20.00
9.00
10.00
4.50
5.00
10
29.00
32.00
20.00
22.00
10.00
11.00
5.00
5.50
11
32.00
35.00
22.00
24.00
11.00
12.00
5.50
6.00
12
35.00
38.00
24.00
26.00
12.00
13.00
6.00
6.50
13
38.00
41.00
26.00
28.00
13.00
14.00
6.50
7.00
14
41.00
44.00
28.00
30.00
14.00
15.00
7.00
7.50
15
44.00
47.00
30.00
32.00
15.00
16.00
7.50
8.00
Example Data Records
Example data file (a000815_1.dat).
DATE,TIME,mode,GLAT,GLON,GDATE,GTIME,GSPD,GHEAD,GSTAT,ATBR,RHUM,PSBC,TAS,
ATBF,TAS1,GALT,ALTF,THETA,THETAE,THETAV,SPHUM,MR,RHO,TDEW,TVIR,CCNLP,CCNTT,
CCNDT,CCNSTAT,CCNSIG,CCNZC,CCNZSS,CCNZF,CCNC,CCNSS,CCNF,NEPH,FCN,PCN,
PCBADS,CN,WRAPCN,PRNG_LPN,DBARP_LPN,DISPP_LPN,CONCP_LPN,CPCAS_LPN_1,
CPCAS_LPN_2,CPCAS_LPN_3,CPCAS_LPN_4,CPCAS_LPN_5,CPCAS_LPN_6,CPCAS_LPN_7,
CPCAS_LPN_8,CPCAS_LPN_9,CPCAS_LPN_10,CPCAS_LPN_11,CPCAS_LPN_12,CPCAS_LPN_13,
CPCAS_LPN_14,CPCAS_LPN_15,FRNG_LWO,CONCF_LWO,DBARF_LWO,DISPF_LWO,LWCF_LWO,
CFSSP_LWO_1,CFSSP_LWO_2,CFSSP_LWO_3,CFSSP_LWO_4,CFSSP_LWO_5,CFSSP_LWO_6,
CFSSP_LWO_7,CFSSP_LWO_8,CFSSP_LWO_9,CFSSP_LWO_10,CFSSP_LWO_11,CFSSP_LWO_12,
CFSSP_LWO_13,CFSSP_LWO_14,CFSSP_LWO_15,SO2,O3,CO,SO2C,O3C,COC
15-08-2000,12:15:14,0,-24.955,31.586,150800,121514,9.040,81.710,1,23.994,
32.265,989.088,2.839,25.233,2.845,203.094,666.320,298.087,0.018,299.181,
0.006,0.006,7.016,6.556,298.245,716.562,26.777,-3.480,-0.010,-5.004,-999.000,
-999.000,0.000,-999.000,-999.000,0.000,-0.015,0.059,-130.510,0.006,0.000,
0.000,0.400,0.062,0.202,1043.208,273.851,355.502,144.121,119.837,98.229,
36.848,9.468,1.851,1.855,0.722,0.412,0.309,0.103,0.000,0.101,0,0.000,0.000,
0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,
0.000,0.000,0.000,0.000,-999.000,0.381,1000.012,-999.000,0.445,1167.585
15-08-2000,12:15:24,0,-24.955,31.586,150800,121524,3.930,178.930,1,24.203,
32.202,988.866,0.405,25.234,0.406,204.979,672.503,298.315,0.018,299.422,
0.006,0.006,7.085,6.711,298.466,716.857,26.755,-3.470,-0.011,-5.391,
-999.000,-999.000,0.000,-999.000,-999.000,0.000,-0.017,0.059,-130.573,0.004,
0.000,0.000,1.000,0.156,0.565,1556.027,395.864,539.476,225.871,169.305,
144.702,57.282,15.136,2.353,2.150,1.638,0.923,0.000,0.615,0.102,0.611,0,
0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.000,
0.000,0.000,0.000,0.000,0.000,0.000,0.000,-999.000,0.153,1000.015,-999.000,
0.178,1166.507
2004/5/11
2004/5/11
webmaster@www.daac.ornl.gov