Title: AceAsia: Kosan (KOS) insitu measurements of aerosol light scattering and absorption coefficients at 1um and 10 um aerosol size cuts.
Contact:
John A. Ogren (john.ogren@noaa.gov, phone: (303)4976210)
Anne Jefferson(anne.jefferson@noaa.gov, phone: (303)4976493)
NOAA Climate Monitoring and Diagnostics Laboratory (CMDL)
325 Broadway R/CMDL 1
Boulder, CO 80305, USA
Fax: (303)4975590
Web: http://www.cmdl.noaa.gov/aero/
Data Set Description:
This README file describes the file format of the a_H01Q2.kos file, which contains data of aerosol light scattering and absorption coefficients taken at the Kosan measurement site on Cheju Island, South Korea from April 5, 2001 to June 26, 2001. Additional files containing aerosol hygroscopic growth data will be added at a later time. The scattering coefficients were measured at three wavelengths (450, 550 and 700 nm) using a TSI model 3563 integrating nephelometer operated at a flow rate of 30 lpm. The absorption coefficient data were collected with a Radiance Research Particle Soot Absorption Photometer at 565 nm radiation and a flow rate of approximately 0.7 lpm. The data have not been adjusted yet to ambient relative humidity and temperature. The relative humidity inside the nephelometer is given in the dataset. Data reported in this file are one hour averages.
Aerodynamic size cuts of the aerosol sample at sub 1um and sub10 um were performed at a relative humidity of 50%.
Nephelometer truncation corrections have been applied to the aerosol scattering coefficients. Corrections to the scattering data for instrument drift between calibrations have not been applied yet. Spot size, flow rate and scattering corrections have been applied to the aerosol absorption coefficient data.
All data files are plain ASCII text, in commaseparated, fixedlength fields. The end of a record is denoted by a linefeed character (ASCII hex 10), which optionally may be preceded by a carriage return.
Universal Coordinated Time (UTC) is used for all time fields. For averaged data, the time reported is the start of the averaging interval.
Leading plus signs are replaced with a blank. This is the common format for the basic measurements obtained at a high time resolution. Missing value codes are always positive. For stations where a particular instrument is not present, the corresponding data field may be either empty or contain the missing value code for that parameter.
A flags field is used in ambient aerosol data files to indicate sampling conditions and data processing status.
Field definition
Each File Code, Status Code combination has a specific format, as described below:
File: a_[Ahmd]<timecode>.<STN>[average format]
A negative value in field 44 through
58 corresponds to an arithmetic average for the hourly average and standard
deviation. Fields 611 refer to the "default" size range, which has
either no upper size cut or a 10um upper size cut (aerodynamic
diameter). Fields 1319 are for the "alternate" size range,
which has a 1um upper size cut (aerodynamic diameter).
Col # 
Name 
Format and Missing Value Code (mvc) 
Description 
Scanf info 
1 
Station_ID 
WSA 
3character ID code 
%3s 
2 
Year 
1993 
Year 
%4d 
3 
StartTime_UTC 
123.12 
Integer
part is Day of Year, 
%6.2f 
4 
0011 
4character code representing system status. 
%4s 

5 
Bap_G (default size) 
±9.999e99 
Aerosol light absorption coefficient (m1), green channel. 
%10.3e 
6 
Bsp_B (default size) 
±9.999e99 
Aerosol total light scattering coefficient (m1), blue channel. 
%10.3e 
7 
Bsp_G (default size) 
±9.999e99 
Aerosol total light scattering coefficient (m1), green channel. 
%10.3e 
8 
Bsp_R (default size) 
±9.999e99 
Aerosol total light scattering coefficient (m1), red channel. 
%10.3e 
9 
Bbsp_B
(default size) 
±9.999e99 
Aerosol backwardshemispheric light scattering coefficient (m1), blue channel. For stations equipped with 4wavelength nephelometers, this field is aerosol total light scattering coefficient (m1), near infrared channel. 
%10.3e 
10 
Bbsp_G (default size) 
±9.999e99 
Aerosol backwardshemispheric light scattering coefficient (m1), green channel. 
%10.3e 
11 
Bbsp_R (default size) 
±9.999e99 
Aerosol backwardshemispheric light scattering coefficient (m1), red channel. 
%10.3e 
12 
Neph_RH 
±999 
Relative Humidity (percent) inside nephelometer 
%4d 
13 
Bap_G,

±9.999e99 
Aerosol light absorption coefficient (m1), green channel. 
%10.3e 
14 
Bsp_B,

±9.999e99 
Aerosol total light scattering coefficient (m1), blue channel. 
%10.3e 
15 
Bsp_G,

±9.999e99 
Aerosol total light scattering coefficient (m1), green channel. 
%10.3e 
16 
Bsp_R,

±9.999e99 
Aerosol total light scattering coefficient (m1), red channel. 
%10.3e 
17 
Bbsp_B

±9.999e99 
Aerosol backwardshemispheric light scattering coefficient (m1), blue channel. For stations equipped with 4wavelength nephelometers, this field is aerosol total light scattering coefficient (m1), near infrared channel. 
%10.3e 
18 
Bbsp_G,

±9.999e99 
Aerosol backwardshemispheric light scattering coefficient (m1), green channel. 
%10.3e 
19 
Bbsp_R,

±9.999e99 
Aerosol backwardshemispheric light scattering coefficient (m1), red channel. 
%10.3e 
20 
SD_Bap_G 
±9.999e99 
Standard deviation of Bap_G data this period 
%10.3e 
21 
SD_Bsp_B 
±9.999e99 
Standard deviation of Bsp_B data this period 
%10.3e 
22 
SD_Bsp_G 
±9.999e99 
Standard deviation of Bsp_G data this period 
%10.3e 
23 
SD_Bsp_R 
±9.999e99 
Standard deviation of Bsp_R data this period 
%10.3e 
24 
SD_Bbsp_B

±9.999e99 
Standard deviation of Bbsp_B or Bsp_NIR data this period 
%10.3e 
25 
SD_Bbsp_G 
±9.999e99 
Standard deviation of Bbsp_G data this period 
%10.3e 
26 
SD_Bbsp_R 
±9.999e99 
Standard deviation of Bbsp_R data this period 
%10.3e 
27 
SD_Neph_RH 
±999 
Standard deviation of Neph_RH data this period 
%4d 
28 
SD_CN_ambient,

±9.999e99 
Standard deviation of CN_ambient (alternate size) data this period 
%10.3e 
29 
SD_Bap,

±9.999e99 
Standard deviation of Bap (alternate size) data this period 
%10.3e 
30 
SD_Bsp_B,

±9.999e99 
Standard deviation of Bsp_B (alternate size) data this period 
%10.3e 
31 
SD_Bsp_G,

±9.999e99 
Standard deviation of Bsp_G (alternate size) data this period 
%10.3e 
32 
SD_Bsp_R,

±9.999e99 
Standard deviation of Bsp_R (alternate size) data this period 
%10.3e 
33 
SD_Bbsp_B

±9.999e99 
Standard deviation of Bbsp_B or Bsp_NIR (alternate size) data this period 
%10.3e 
34 
SD_Bbsp_G,

±9.999e99 
Standard deviation of Bbsp_G (alternate size) data this period 
%10.3e 
35 
SD_Bbsp_R,

±9.999e99 
Standard deviation of Bbsp_R (alternate size) data this period 
%10.3e 
36 
N_Bap_G 
±99999 
Number of data points used in computation 
%6d 
37 
N_Bsp_B 
±99999 
Number of data points used in computation 
%6d 
38 
N_Bsp_G 
±99999 
Number of data points used in computation 
%6d 
39 
N_Bsp_R 
±99999 
Number of data points used in computation 
%6d 
40 
N_Bbsp_B

±99999 
Number of data points used in computation 
%6d 
41 
N_Bbsp_G 
±99999 
Number of data points used in computation 
%6d 
42 
N_Bbsp_R 
±99999 
Number of data points used in computation 
%6d 
43 
N_CN_ambient,

±99999 
Number of data points used in computation 
%6d 
44 
N_Bap_G,

±99999 
Number of data points used in computation 
%6d 
45 
N_Bsp_B,

±99999 
Number of data points used in computation 
%6d 
46 
N_Bsp_G,

±99999 
Number of data points used in computation 
%6d 
47 
N_Bsp_R,

±99999 
Number of data points used in computation 
%6d 
48 
N_Bbsp_B

±99999 
Number of data points used in computation 
%6d 
49 
N_Bbsp_G,

±99999 
Number of data points used in computation 
%6d 
50 
N_Bbsp_R,

±99999 
Number of data points used in computation 
%6d 
The default size range is defined to be the total from 010 um aerodynamic diameter. The alternate size range is from 01 um aerodynamic diameter.