NCSU SP2

Data Level b1: QC checks applied to measurements
Data Format: CSV
Description: See "instrument description
Site: Houston, TX; Tracking Aerosol Convection interactions ExpeRiment (HOU)
Location: Houston, TX; AMF1 (main site for TRACER)
Facility Code: M1
Category: Aerosol Properties
Data Type: PI Data 
Source Instrument/Data: Single Particle Soot Photometer (SP2)

Start Date: 2022-06-01
End Date: 2022-09-27 
Contact PI: Markus Petters (mdpetter@ncsu.edu)
Funding Source: DOE ASR award US Department of Energy, Office of Science, Biological and Environment Research (grant no. DE-SC 0021074)

instrument description
	"The SP2 was located in the temperature-controlled trailer adjacent to the NCSU Flux Tower to observe refractory black carbon (rBC) number concentration and mixing states of black carbon. The sample line brought aerosol inside the trailer at 4.5 L min-1, where it was distributed between 3 CPCs (TSI 3776c, Dc ~ 2.5 nm, TSI 3771, Dc ~10nm, and TSI 3772, Dc ~40 nm) with different size cuts, a printed particle optical spectrometer (POPS), and SP2. Please contact mdpetter@ncsu.edu for further information."

Quality assurance and quality control
        "SP2 merged files were produced from the binary file format which stored single particle information. The data was put at regularly gridded 16-size bin channels. The black carbon concentration data and diagnostic files were generated by the SP2 manufacturer logged time at UTC. Only days without malfunction are reported. Maintenance time was not excluded from merged.csv files, but removed from NCSU tower data. An example of a malfunction day is when the sample flow rate was low (<< 0.12 L min-1). Example of suspicious day was when SP2 purely scattering particle concentrations were lower than that of printed optical particle concentrations."

	
Routine data days: 
	"20220701-20220719
	 20220928-20220929"

Suspect data days: 
	"20220801-20220814
	 20220916-20220927"

Incorrect data days: 
	"20220720-20220731
	 20220815-20220907"

SP2 calibration test days:
 
  	"20220726
   	 20220926"
  
SP2 calibration was performed on 20220726 and 20220926. Incandescence calibration was performed in the field against colloidal graphitic carbon. Scattering detector calibration was performed in the field using mobility-selected dried ammonium sulfate particles. Files for 20220726 and 20220926 included 64 bin size channels for scattering and 512 size bin channels for incandescence for calibration. All other files included 16-bin channels for both incandescence and scattering channels.

SP2 incandescence bin bounds:
unit = "nm"
SP2 incandescence bin bounds = "79.0, 86.0, 94.0, 103.0, 113.0, 125.0, 138.0, 152.0, 168.0, 186.0, 206.0, 229.0, 254.0, 282.0, 315.0, 352.0, 395.0"

SP2 scattering bin bounds:
unit = "nm"
SP2 scattering bin bounds = "222.0, 235.0, 248.0, 262.0, 277.0, 292.0, 309.0, 326.0, 345.0, 364.0, 385.0, 407.0, 430.0, 454.0, 479.0, 506.0, 535.0"

variables
 	timestamp ;
	        longname = "NCSU SP2 time stamp, in ISO 8601 standard form, UTC Timestamp since 2022-06-0100:00:00.0";
	        unit = "YYYY-MM-ddHH:MM:SS.s"
	        comment = nothing
	        
	q ;
		longname = "Standard volumetric sample flow rate."
	        unit = "vccm"
	        comment = nothing
	        
	scathk ;
	 	longname = "Scattering particle concentrations detected by the single particle soot photometer (SP2)."
	        unit = "cm-3"
	        missing value = ""
	        comment = "Scattering concentrations obtained from the SP2 housekeeping file."

	rbchk ;
		longname = "Incandescence refractory black carbon (rBC) concentrations detected by the single particle soot photometer (SP2)."
	        unit = "cm-3"
	        missing value = ""
	        comment = "Refractory black carbon concentrations obtained from the SP2 housekeeping file. "

	scatTotal ;
	 	longname = "Purely scattering reconstructed particle concentrations based on low-gain detector."
	        unit = "cm-3"
	        missing value = ""
	        comment = ""
	    	   
	scat1 ;
		longname = "First bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	
	scat2 ;
		longname = "Second bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	scat3 ;
		longname = "Third bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	scat4 ;
		longname = "Fourth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	
	scat5 ;
		longname = "Fifth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	scat6 ;
		longname = "Sixth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	scat7 ;
		longname = "Seventh bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	scat8 ;
		longname = "Eighth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	scat9 ;
		longname = "Ninth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	scat10 ;
		longname = "Tenth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	scat11 ;
		longname = "Eleventh bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	scat12 ;
		longname = "Twelfth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	scat13 ;
		longname = "Thirteenth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	scat14 ;  
		longname = "Fourteenth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	scat15 ;
		longname = "Fifteenth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	scat16 ;
		longname = "Sixteenth bin size distribution of scattering particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbcTotal ;
	 	longname = "Purely incandescence reconstructed particle concentrations based on high-gain broadband detector."
	        unit = "cm-3"
	        missing value = ""
	        comment = ""
	        
	rbc1 ;
		longname = "First bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	
	rbc2 ;
		longname = "Second bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	rbc3 ;
		longname = "Third bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	rbc4 ;
		longname = "Fourth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	
	rbc5 ;
		longname = "Fifth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	rbc6 ;
		longname = "Sixth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	rbc7 ;
		longname = "Seventh bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	rbc8 ;
		longname = "Eighth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing
	        
	rbc9 ;
		longname = "Ninth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbc10 ;
		longname = "Tenth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbc11 ;
		longname = "Eleventh bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbc12 ;
		longname = "Twelfth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbc13 ;
		longname = "Thirteenth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	rbc14 ;  
		longname = "Fourteenth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbc15 ;
		longname = "Fifteenth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	rbc16 ;
		longname = "Sixteenth bin size distribution of refractory black carbon particles."
	        unit = "cm-3"
	        missing value = ""
	        comment = nothing 
	        
	ThinCrBC ;
		longname = "Thinly coated refractory black carbon (rBC) concentrations based on delay time between scattering and incandescent signal peak."
	        unit = "cm-3"
	        missing value = ""
	        comment = ""
	        
	ThickCrBC ;
		longname = "Thickly coated refractory black carbon (rBC) concentrations based on delay time between scattering and incandescent signal peak."
	        unit = "cm-3"
	        missing value = ""
	        comment = ""