ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-10911-2011 Springtime carbon emission episodes at the Gosan background site revealed by total carbon, stable carbon isotopic composition, and thermal characteristics of carbonaceous particles Jung J. 1 Kawamura K. 1 Institute of Low Temperature Science, Hokkaido University, Sapporo 0600819, Japan 03 11 2011 11 21 10911 10928 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/11/10911/2011/acp-11-10911-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/10911/2011/acp-11-10911-2011.pdf

In order to investigate the emission of carbonaceous aerosols at the Gosan background super-site (33.17° N, 126.10° E) in East Asia, total suspended particles (TSP) were collected during spring of 2007 and 2008 and analyzed for particulate organic carbon, elemental carbon, total carbon (TC), total nitrogen (TN), and stable carbon isotopic composition (&delta;<sup>13</sup>C) of TC. The stable carbon isotopic composition of TC (&delta;<sup>13</sup>C<sub>TC</sub>) was found to be lowest during pollen emission episodes (range: −26.2&permil; to −23.5&permil;, avg. −25.2 ± 0.9&permil;), approaching those of the airborne pollen (−28.0&permil;) collected at the Gosan site. Based on a carbon isotope mass balance equation, we found that ~42% of TC in the TSP samples during the pollen episodes was attributed to airborne pollen from Japanese cedar trees planted around tangerine farms in Jeju Island. A negative correlation between the citric acid-carbon/TC ratios and &delta;<sup>13</sup>C<sub>TC</sub> was obtained during the pollen episodes. These results suggest that citric acid emitted from tangerine fruit may be adsorbed on the airborne pollen and then transported to the Gosan site. Thermal evolution patterns of organic carbon during the pollen episodes were characterized by high OC evolution in the OC2 temperature step (450 °C). Since thermal evolution patterns of organic aerosols are highly influenced by their molecular weight, they can be used as additional information on the formation of secondary organic aerosols and the effect of aging of organic aerosols during the long-range atmospheric transport and sources of organic aerosols.

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