Submicron organic and elemental aerosol composition at Utgiagvik (Barrow), Alaska, from March 2008 to February 2010. In Atmospheric Aerosol Submicron Particle Composition including Organic Functional Group Concentrations at Arctic Locations
Automated measurements were maintained by NOAA ESRL staff at their laboratory in Utgiagvik (Barrow), Alaska, using an 8‐sample rotating filter holder (described by Quinn et al. [2002]), modified to replace materials that outgas volatile organic compounds with metal or Delrin components [Shaw et al....
| Main Authors: | , , , , , |
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| Format: | Dataset |
| Language: | unknown |
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UC San Diego Library Digital Collections
2020
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| Online Access: | https://dx.doi.org/10.6075/j01n7zn2 http://library.ucsd.edu/dc/object/bb4032677p |
| Summary: | Automated measurements were maintained by NOAA ESRL staff at their laboratory in Utgiagvik (Barrow), Alaska, using an 8‐sample rotating filter holder (described by Quinn et al. [2002]), modified to replace materials that outgas volatile organic compounds with metal or Delrin components [Shaw et al. 2010]. The filter holder exposes 8 different 47 mm diameter Teflon filters to ambient air pulled through a warmed inlet at 30 L min−1. Filters were exposed for 24‐hr in winter and spring and up to 96‐hr in summer when aerosol concentrations are low. Filters were sealed and frozen during transport and storage. To avoid contamination from the town of Barrow, sector control was used to collect samples only when wind speed was above 0.5 m s−1 and direction was between 0° and 130° (60% of sampling time). Fourier transform infrared (FTIR) spectra were collected for each filter in a temperature and humidity controlled clean room to measure the absorption of organic functional groups and convert to mass [Maria et al., 2002; Gilardoni et al., 2007] using an automated algorithm [Russell et al., 2009]. The baselined spectra are provided for each sample including filter number, start and stop times, wavenumber, and absorption. We quantified saturated aliphatic CCH (alkane group), carboxylic COH with associated C=O in an acid group COOH, non‐ acidic hydroxyl COH (alcohol group), and primary amine CNH2 groups [Russell et al., 2009]. Non‐acidic carbonyl C=O, aromatic and unsaturated aliphatic (alkene) functional groups are omitted because they were below detection for the majority of the study. Cumulative air flow for each filter was recorded for each filter by ESRL staff, and these measured volumes were used to calculate ambient concentrations from the measured mass on each filter. Results of PMF analysis of aerosol sources from FTIR spectra are also included. A select number of filters collected were sent to Chester laboratories for X‐ray fluorescence (XRF) spectroscopy [Maria et al., 2002] to quantify S, Na, Cl, Si, Al, Fe, Ti, Ca, Mg, K, V, Zn, and Br (additional measured elements were below detection for a majority of samples). Ion chromatography was used to quantify ionic composition of simultaneous filters [Quinn et al., 2002]. |
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