TITLE: Aircraft C-130 Aerosol OC, functional group identification via FTIR, and 
elemental composition via XRF (L. Russell)

AUTHOR(S):

	Lynn M. Russell and Steve F. Maria
	A-217 Engineering Quadrangle
	Princeton University, NJ 08544
	Phone: LMR: (609) 258-1144, SFM: (609) 258-6670
	Fax: (609) 258-0211
	E-mail: lrussell@princeton.edu, smaria@princeton.edu

1.0 DATA SET OVERVIEW:

	This data set contains sampling times and locations as well as 
functional group (FTIR) and elemental (XRF) composition for bulk submicron 
Teflon filter samples collected aboard the NCAR C-130 aircraft near Japan during
the ACE-Asia project in April-May 2001.

2.0 INSTRUMENT DESCRIPTION:

	Samples were collected by pulling 180 lpm into the aircraft through a 
solid diffuser inlet, and then by concentrating the sample stream by a 
concentration factor of approximately 13 using three virtual impactors in series
before pulling the final 2 lpm sample stream through Telfon filters.  Filter 
samples were shipped frozen and stored frozen and then analyzed via 
spectroscopic methods.  Samples were stored 1 week to 1 year before analysis and
analyses were repeated to check for storage artifacts.

3.0 DATA COLLECTION AND PROCESSING:

	Fourier transform infra-red (FTIR) spectra were collected for each 
filter prior to sample collection (pre-scan), and after sample collection 
(post-scan).  The difference between the two scans gives the aerosol absorption 
signature, and peak integration then gives an estimate of the relative amounts 
of identifiable functional groups (ammonium, sulfate, silicate, carbonate, C-H, 
C=O, C-OH, C-N, and C-S).  After FTIR spectra were collected, XRF was performed 
by Chester LabNet to quantify elemental composition for all elements heavier 
than (and including) Aluminum.  As a final step, solvent rinsing was performed 
on each filter sample to determine the solubility properties of each identified 
functional group.

4.0 DATA FORMAT:

	The data file is a tab-delimited ASCII file.  It can be easily opened by
Excel using the "tab-delimited" option.
	DATA VERSION = 1.3 (12 February 2003)
	Parameters include: sample number, research flight number, sample 
collection start and stop times (multiple columns are for samples that were 
stopped and then restarted), sample length, sampled volume flow, sampled mass 
flow, sample average altitude, sample altitude standard deviation, sample 
latitudes and longitudes (starting position, ending position, and average 
position), and concentration and errors of silicate (SiO4), carbonate (CO3), OC,
OM, Al, Si, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br,
Rb, Sr, Y, Zr, Mo, Ag, In, and Pb.

5.0 DATA REMARKS:

	The actual concentration factor for each sample has been corrected for 
ambient size distributions for 0.1-1.0 micron diameter using OPC data (contact 
S. Howell).  This correction is subject to an uncertainty of +/- 7% for flights 
for which OPC data were available for correction.  For research flight 9, OPC 
data are not yet available so the error in the concentration factor is +/- 10%.
	All FTIR data are reported using calibrated absorbance-to-mass ratios 
(Maria et al, 2002).  The errors listed in the data set are species specific 
uncertainties in this conversion to mass (note that the individual errors listed
for each species for each sample do NOT include the additional 7% to 10% error 
associated with the inlet and concentrator).
	XRF errors are reported by Chester LabNet.  Elements for which there are
less than 10 concentrations that are above the detection limit are not included
in this release.
	OC mass is the sum of carbon quantified via the C-H, C=O, C-OH, C-N, C-S
functional group absorbances.  C-H carbon mass is calculated assuming on average
1 carbon atom for every 2 measured C-H bonds, while the carbon mass for other 
functional groups is calculated assuming on average 1 carbon atom for every 
measured bond.  Individual functional group and solvent rinsing data are 
available upon request, but are not a part of this release.
	FTIR sulfate, ammonium, and nitrate are not being released at this time 
in order to assess possible interferences with those species.

6.0 REFERENCES:

	Blando, J.D.; Porcja, R.J.; Turpin, B.J. Aerosol Sci. Technol. 2001 35, 
899-908.

	Maria, S.F.; Russell, L.M.; Turpin, B.J.; Porcja, R.J. Atmos. Environ. 
2002 36, 5185-5196.