DOI: 10.25338/b8sg73
title: Data from: Organic functional group and organic matter concentrations from FT-IR measurements of particulate matter samples in the Southeastern Aerosol Research and Characterization (SEARCH) network from 2009-2016

description: This dataset contains organic functional group, organic matter (OM),
 organic carbon (OC) concentration measurements at five sites in the SEARCH
 network from 2009-2016.  Spectra from each sample are included,
 in the format used in these papers.  The sampling sites are urban
 Birmingham (BHM) and rural Centreville (CTR) in Alabama, urban Jefferson
 Street, Atlanta (JST) and rural Yorkville (YRK) in Georgia, and rural
 Outlying Landing Field (OLF) near Pensacola in Florida as well as a
 co-located site at JST (cJST).  The organic functional groups
 measured are:  saturated/aliphatic C-H (aCH), carboxylic acid
 (COOH), oxalate C=O (oxOCO), and non-acid, non-oxalate carbonyl
 (naCO).  OM mass is calculated as the sum of the organic
 functional group masses.  Samples were collected for 24-hour from
 midnight to midnight. OC mass is the sum of the mass of carbon from each
 functional group.  From 2009-2015, data are available for every
 third day, and in 2016, daily data are available. 
description: Teflon filter samples were
 collected as part of the SEARCH network.  Samples from five SEARCH network
 sites, and one site co-located with JST (cJST) are used in this
 study: Centreville, AL (CTR, site number
 3): 32.9033 N, -87.2499 W, elevation 141 m a.s.l.
 Yorkville, GA (YRK, site number 4): 33.9284 N, -85.0454 W,
 elevation 398 m a.s.l. Jefferson Street, Atlanta, GA
 (JST, site number 5): 37775 N, -84.4166 W, 293 m a.s.l.
 Co-located Jefferson Street, Atlanta, GA (cJST, site number 15):
 33.7775 N, -84166 W, 293 m a.s.l.  Birmingham, AL
 (BHM, site number 6): 33.5530, -86.8147 W, 174 m a.s.l.
 Outlying Landing Field near Pensacola, FL (OLF, site number 7):
 30.5500 N, -87.3753 W, elevation 25 m a.s.l. The functional group data are
 obtained from FT-IR spectra of particulate matter samples collected on
 Teflon filters.  The FT-IR spectra are calibrated using laboratory
 generated standards on Teflon filters containing compounds with each of
 the functional groups as well as interferents such as ammonium sulfate,
 ammonium nitrate and water.  All data are reported in
 mg/m<sup>3</sup>, and the uncertainties in functional group,
 OM, and OC concentrations are reported for each sample. Uncertainties are
 calculated from additive uncertainty (minimum detection limit, MDL) and
 multiplicative uncertainty (based on co-located sampling uncertainty), as
 described elsewhere (Hyslop and White, 2009).  Spectra included are
 infrared absorption at each specified wavenumber (between ~4000 and 1500
 cm<sup>-1</sup>, in absorbance units). Spectra are raw
 (neither baseline correction nor derivation was performed).  For more
 information, refer to the accompanying papers on this work, Boris et al.,
 2019 and Boris et al., <i>In Preparation</i>. <b>References</b> Boris, A. J., Takahama, S., Weakley, A. T., Debus, B. M., Fredrickson, C. D., Esparza-Sanchez, M., Burki, C., Reggente, M., Shaw, S. L., Edgerton, E. S. and Dillner, A. M.: Quantifying organic matter and functional groups in particulate matter filter samples from the southeastern United States – Part 1: Methods, Atmos. Meas. Tech., 12, 1–24, doi:10.5194/amt-2019-144, 2019. Boris, A. J., Takahama, S., Weakley, A. T., Debus, B. M., Reggente, M., Burki, C., Shaw, S. L., Edgerton, E. S. and Dillner, A. M.: Quantifying organic matter and functional groups in particulate matter filter samples from the southeastern United States – Part II: Trends, Atmos. Meas. Tech., n.d. Hyslop, N. P. and White, W. H.: Estimating precision using duplicate measurements, J. Air Waste Manag. Assoc., 59(9), 1032–1039, doi:10.3155/1047-3289.59.9.1032, 2009.
description: Functional group
 concentrations below MDL have been censored to MDL/2, and samples with
 three or greater functional group concentrations below MDL were removed
 from the dataset.  Samples with insufficient flow rates or sampling times
 were also removed from the dataset.  For more information including the
 description of all columns/variables in data files, refer to the ReadMe
 file and to the accompanying paper on the methods of this work, Boris et
 al., 2019.