Chemical characterization of free tropospheric aerosols in the North Atlantic measured at the Pico Mountain observatory during summer of 2012
Fall Meeting 2013
2013
- 1Usage
Metric Options: CountsSelecting the 1-year or 3-year option will change the metrics count to percentiles, illustrating how an article or review compares to other articles or reviews within the selected time period in the same journal. Selecting the 1-year option compares the metrics against other articles/reviews that were also published in the same calendar year. Selecting the 3-year option compares the metrics against other articles/reviews that were also published in the same calendar year plus the two years prior.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Metrics Details
- Usage1
- Abstract Views1
Conference Paper Description
Free tropospheric aerosol was sampled at the Pico Mountain Observatory located at 2225 m a.s.l. on Pico Island in the Azores archipelago in the North Atlantic. The observatory is ~3900 km east and downwind of North America (38°28'15''N; 28°24'14''W) and thus enables sampling of free tropospheric air transported over long distances mainly from North America, and is rarely affected by local emissions. Currently, little is known about the nature of aged aerosol motivating new measurements at the Observatory. This work enabled for the first time a detailed chemical characterization of the free tropospheric, aged aerosols intercepted at the Observatory, as well as its comparison with collocated measurements of optical and physical properties. Samples of fine particles (PM2.5) were collected during summer 2012 on quartz filters using high-volume samplers and analyzed for organic and elemental carbon (OC and EC, respectively), water-soluble organic carbon (WSOC) and inorganic ion species. Special attention was given to aerosol samples collected on September 24 and 25 and its WSOC composition was analyzed using ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Approx. 4000 formulas were assigned to each of the mass spectra in the range of m/z 100-900. The majority of assigned molecular formulas have CHO and CHNO elemental composition (~ 2/3 and 1/3, respectively), while sulfur containing species with CHOS and CHNOS elemental composition represent a very small number fraction. Surprisingly, this highly processed aerosol has a fairly low O/C ratio of 0.45. Most of the assigned formula species have aliphatic and olefinic structures, as indicated by the aromaticity index and double bond equivalents of the detected species. The detailed chemical characterization of samples analyzed with FT-ICR MS, including its elemental composition, elemental ratios (O:C, H:C and OM:OC), and their carbon oxidation state will be presented. Chemical characterization of the observed aerosols is compared to the collocated measurements of gases, particle size and optical properties, meteorological parameters and it is critically compared to the other characterizations found in the current literature. Finally, we compare our results to the physical properties of collected aerosols as observed by electron microscopy.
Bibliographic Details
Provide Feedback
Have ideas for a new metric? Would you like to see something else here?Let us know