GRIP LARGE Aerosol Number Density Readme File		
Langley Aerosol Research Group
Bruce Anderson, Gao Chen, Lee Thornhill, Andreas Beyersdorf, Luke Ziemba and Eddie Winstead
MS 483, NASA Langley Research Center, Hampton VA
Data Contact Person: Lee Thornhill, kenneth.l.thornhill@nasa.gov

Time resolution = 30 seconds

Last Revision = September 2010

Variables:
   Time			seconds		UTC seconds (from REVEAL feed)	
   Day of Year	 			from REVEAL feed
   Altitude		ft		from REVEAL feed
   Ambient Pressure	mb		Static Air Pressure (from REVEAL feed)
   Ambient Temp		K		Static Air Temperature (from REVEAL feed)
   Total CNC		#/cm3		Number Concentration from the CNC-3025 (>3 nm) 
   Cold CN		#/cm3		Total CN from the CNC-3010 (>10 nm)
   Hot CN		#/cm3		Volatile CN from the CNC-3010 (>10 nm)

Data Flags
-999.0 = Data Missing

Notes
1. All aerosol number densities were corrected to ambient temperature and pressure. 
To obtain values that are representative of sea level conditions, multiply the densities
by (1013/Ambient Pressure)*((ambient temperature+273)/293)
2. The 50% cut-size diameters of the TSI3025 and TSI3010 CN counters are 3 and 10 nm, respectively.
Therefore, the "Ultrafine" CN number densities are representative of the concentration of particles
that are between 3 and 10 nm in size.