NOAA ship Discoverer 
TOTAL AEROSOL Light Scattering and Light Absorption Data ACE1 project
Reduced and Compiled by NOAA-PMEL 
Version 1, 15 November 1996 
Vladimir Kapustin and Tim Bates 
 
Data File nph60.csv contains the following parameters: 
 
JDAY (decimal)
ABS(soot)
TOTSCAT1
TOTSCAT2
TOTSCAT3
SUBSCAT1
SUBSCAT2
SUBSCAT3

 
JDAY: (decimal)
The data are compiled in 60 minute averages.  The time given is the
center of the averaging period.  The time is given as decimal day of year 
(JDAY) such that JDAY 32.5 is 12 noon GMT on February 1. 

The final 60 min average data are reported in columns: 
ABS(soot),TOTSCAT1,TOTSCAT2,TOTSCAT3,SUBSCAT1,SUBSCAT2,SUBSCAT3.

The ABS(soot) data are compiled as the 60 minute averages of 
the aerosol absorption coefficient at 550nm as measured by the PMEL 
aethalometer (Weiss model). The absorption values are in units of  m^-1.

TOTSCAT1,TOTSCAT2,TOTSCAT3 are the 60 minute averages of the total aerosol 
light scattering as measured by the PMEL TSI 3-wavelength (450,550,700nm) 
nephelometer.  The instrument was calibrated on the cruise using CO2.  
Two impactors were placed upstream of the nephelometer.  One had a nominal 
size cut of 10 um and the other of 1 um.  A valve was switched every 15 
minutes by the data logger so that either light scattering of the total 
aerosol or of the submicron aerosol light scattering was measured. 
Submicron aerosol light scattering data are in the columns SUBSCAT1, 
SUBSCAT2, SUBSCAT3. The scattering values are in units of  m^-1.

Missing and polluted data values have been replaced by -99.