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SAFARI 2000 JRA AEROCOMMANDER TRACE GAS, AEROSOL, AND CCN DATA, DRY SEASON 2000
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Summary:

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.

Data Citation:

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.

References:

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.

Data Format:

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

CCNLPmAmp -999CCN_laser_power
CCNTTdegC -999CCN_top_temperature
CCNDTdegC -999CCN_deferential_temperature
CCNSTATV -999CCN_status
CCNSIGV -999CCN_signal_voltage
CCNZCcm^3 -999CCN calculated concentration lag corrected
CCNZSS% -999CCN calculated supersaturation
CCNZFbinary -999CCN saturation flag
CCNCcm^3 -999CCN calculated concentration
CCNSS% -999CCN calculated supersaturation
CCNFbinary -999CCN saturation flag
NEPHScat -999Nepholometer_scattering_coeff
FCNslpm -999CN_SampleFlow
PCNhPa -999CN_Counter_pressure
PCBADSdegC -999CN_Temp
XICNslpm -999CN_side_flow
CNcnts -999CN_digital_counter
WRAPCNcnts -999CN_digital_wrap_counter
CNCcm^3 -999CN corrected concentration
FCNCvlpm -999CN corrected flow
XICNCvlpm -999CN 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:

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 

Document Information:

2004/5/11

Document Review Date:

2004/5/11

Document Curator:

webmaster@www.daac.ornl.gov

Document URL:

http://daac.ornl.gov