TITLE: Ship Aerosol OC, functional group identification via FTIR, and elemental
composition via XRF (L. Russell)

AUTHOR(S):

	Lynn M. Russell and Monica D. Rivera A-217 Engineering Quadrangle
	Princeton University, NJ 08544 Phone: LMR: (609) 258-1144, MDR: (609)
	258-6670 Fax: (609) 258-0211 E-mail: lrussell@princeton.edu,
	mrivera@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 NOAA Ron H. Brown
	ship from Hawaii to Japan during the ACE-Asia project in March-April
	2001.

2.0 INSTRUMENT DESCRIPTION:

	Samples were collected by pulling 40 lpm into the ship through a common
	aerosol inlet, and then by concentrating the sample stream by a factor
	of approximately 4.2 using two 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 month 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.

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, sample start and stop
	times, sample length, sampled air volume, sample type, Average Lat.,
	Average Long., Start & Stop Lat & Long, and concentration and errors
	(Unc) of silicate (SiO4), carbonate (CO3), OC, OM, Al, Si, S, Cl, K,
	Ca, Ti, V, Mn, Fe, Cu, Zn, Ga, As, Se, Br, Rb, Sr, Zr, Ag, Pb, Pd, Sn,
	Sb, Ba, La, and Hg.

5.0 DATA REMARKS:

	The actual concentration factor achieved by the virtual impactors is
	size dependent, and therefore depends on the inlet ambient size
	distribution (Maria et al., 2002, Atm. Env., in press).  This data set
	has been corrected for variations in the concentration factor.  All
	FTIR data are reported using calibrated absorbance-to-mass ratios
	(Maria et al, 2002, Atm. Env., in press).  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 C=O carbon mass is calculated assuming on average 1 carbon
	atom for every measured C=O bond.  Individual functional group and
	solvent rinsing data are avialable 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.  The "sample type" information refers to the different
	air mass types encountered: Marine Air (MA), Polluted Air (PA), Very
	Polluted Air (VPA), Very Polluted Air with Dust (VPAD), Polluted Air
	with Dust (PAD), and Moderately Polluted Air (MPA).

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.