Stable carbon isotopic composition of low-molecular-weight dicarboxylic acids and ketoacids in remote marine aerosols
[ 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 part...
| Published in: | Journal of Geophysical Research |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
AMER GEOPHYSICAL UNION
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| Subjects: | |
| Online Access: | http://hdl.handle.net/2115/13709 https://doi.org/10.1029/2005JD006466 |
| Summary: | [ 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. |
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