Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published May 27, 2007 | Supplemental Material + Published
Journal Article Open

Regional variation of organic functional groups in aerosol particles on four U.S. east coast platforms during the International Consortium for Atmospheric Research on Transport and Transformation 2004 campaign


Submicron atmospheric aerosol samples were collected during the International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) 2004 campaign on four platforms: Chebogue Point (Nova Scotia, Canada), Appledore Island (Maine), the CIRPAS Twin Otter over Ohio, and the NOAA R/V Ronald H. Brown in the Gulf of Maine. Saturated aliphatic C-C-H, unsaturated aliphatic C=C−H, aromatic C=C−H, organosulfur C-O-S, carbonyl C=O, and organic hydroxyl C-OH functional groups were measured by calibrated Fourier Transform Infrared (FTIR) spectroscopy at all four sampling platforms. The ratio of molar concentrations of carbonyl C=O to saturated aliphatic C-C-H groups was nearly constant at each sampling platform, with the Twin Otter samples having the lowest ratio at 0.1 and the three more coastal platforms having ratios of 0.4 and 0.5. Organic mass (OM) to organic carbon (OC) ratios follow similar trends for the four platforms, with the Twin Otter having the lowest ratio of 1.4 and the coastal platforms having slightly higher values typically between 1.5 and 1.6. Organosulfur compounds were occasionally observed. Collocated organic aerosol sampling with two Aerodyne aerosol mass spectrometers for OM, a Sunset Laboratory thermo-optical analysis instrument for OC, and an ion chromatography-particle into liquid sampler (IC-PILS) for speciated carboxylic acids provided comparable results for most of the project, tracking the time series of FTIR OM, OC, and carbonyl groups, respectively, and showing simultaneous peaks of similar magnitude during most of the project. The FTIR/IC-PILS comparison suggests that about 9% of the carbonyl groups found in submicron organic particles on the Twin Otter are typically associated with low molecular weight carboxylic acids.

Additional Information

Copyright 2007 by the American Geophysical Union. Received 30 June 2006; revised 30 January 2007; accepted 2 April 2007; published 15 May 2007. This multiplatform research effort was made possible by seed funding from the James S. McDonnell Foundation Award for 21st Century Science. Subsequent development, training, and analysis were supported by NOAA grant NA17RJ1231. Additional support and field measurement opportunities were provided by National Science Foundation grant ATM04-01611. We are grateful to Derek Coffman, Susanne Hering, Nathan Kreisberg, Roland von Glasow, Susanne Marquardt, Cynthia Randles, Kathryn Holderness, Alice Delia, Jennifer Ayers, Alex Pszenny, and William Keene for assistance in collecting samples and to Andreas Stohl for compiling the FLEXPART analyses. This paper is also contribution 138 to the Shoals Marine Laboratory.

Attached Files

Published - jgrd13355.pdf

Supplemental Material - jgrd13355-sup-0001-t01.txt

Supplemental Material - jgrd13355-sup-0002-t02.txt


Files (599.3 kB)
Name Size Download all
711 Bytes Preview Download
759 Bytes Preview Download
597.9 kB Preview Download

Additional details

August 22, 2023
October 18, 2023