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Stable carbon isotopic composition of low-molecular-weight dicarboxylic acids and ketoacids in remote marine aerosols
| Title: | Stable carbon isotopic composition of low-molecular-weight dicarboxylic acids and ketoacids in remote marine aerosols |
| Authors: | Wang, Haobo Browse this author | | Kawamura, Kimitaka Browse this author →KAKEN DB |
| Keywords: | Carbon isotopic composition | | Decarboxylation | | Latitudinal change | | Photochemical aging |
| Issue Date: | 15-Apr-2006 |
| Publisher: | AMER GEOPHYSICAL UNION |
| Journal Title: | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
| Volume: | 111 |
| Issue: | D7 |
| Start Page: | D07304 |
| Publisher DOI: | 10.1029/2005JD006466. |
| Abstract: | [ 1] We determined stable carbon isotopic composition (delta C-13) of C-2 to C-9 dicarboxylic acids (DCAs) and some ketoacids in the marine aerosols from the western Pacific and Southern Ocean (35 degrees N to 65 degrees S). On average, oxalic ( mean, - 16.8 parts per thousand), adipic ( - 17.2 parts per thousand), and glyoxylic ( - 17.6 parts per thousand) acids showed heavier delta C-13, whereas maleic ( - 24.2 parts per thousand), methylmalonic ( - 23.6 parts per thousand), and phthalic ( - 23.1 parts per thousand) acids were more depleted in C-13. Oxalic acid presented very diverse delta C-13 values ( - 27 to -7 parts per thousand), which increased from midlatitudes toward the equator. A similar latitudinal trend of delta C-13 was also found for malonic, succinic, and adipic acids. However, such a trend was not observed for phthalic, maleic, and glyoxylic acids. We suggest that the delta C-13 increase toward the equator is associated with photochemically aged air masses, in which kinetic isotope effects for photochemical degradation of DCAs may be important. Differences in delta C-13 of some saturated DCAs were also found to increase from midlatitudes to the equator. |
| Relation: | http://www.agu.org/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/13709 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 河村 公隆
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