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Marine nitrogen fixation as a possible source of atmospheric water-soluble organic nitrogen aerosols in the subtropical North Pacific
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| Title: | Marine nitrogen fixation as a possible source of atmospheric water-soluble organic nitrogen aerosols in the subtropical North Pacific |
| Authors: | Dobashi, Tsukasa Browse this author | | Miyazaki, Yuzo Browse this author →KAKEN DB | | Tachibana, Eri Browse this author | | Takahashi, Kazutaka Browse this author | | Horii, Sachiko Browse this author | | Hashihama, Fuminori Browse this author | | Yasui-Tamura, Saori Browse this author | | Iwamoto, Yoko Browse this author | | Wong, Shu-Kuan Browse this author | | Hamasaki, Koji Browse this author |
| Issue Date: | 27-Jan-2023 |
| Journal Title: | Biogeosciences |
| Volume: | 20 |
| Issue: | 2 |
| Start Page: | 439 |
| End Page: | 449 |
| Publisher DOI: | 10.5194/bg-20-439-2023 |
| Abstract: | Water-soluble organic nitrogen (WSON) in marine atmospheric aerosols affect the water solubility, acidity, and light-absorbing properties of aerosol particles, which are important parameters in assessing both the climate impact and the biogeochemical cycling of bioelements. Size-segregated aerosol and surface seawater (SSW) samples were simultaneously collected over the subtropical North Pacific to investigate the origin of WSON in the marine atmosphere. The fine-mode WSON concentration (7.5 ± 6.6 ngN m−3) at 200–240∘ E along 23∘ N, defined as the eastern North Pacific (ENP), was significantly higher than that (2.4 ± 1.9 ngN m−3) at 135–200∘ E, defined as the western North Pacific (WNP). Analysis of the stable carbon isotope ratio of water-soluble organic carbon (WSOC; δ13CWSOC) together with backward trajectory indicated that most of the observed WSON in the fine particles in the ENP originated from the ocean surface. We found positive relations among nitrogen-fixation rate, dissolved organic nitrogen (DON) in SSW, and the WSON concentrations. The result suggests that reactive nitrogen (DON and ammonium), produced and exuded by nitrogen-fixing microorganisms in SSW, contributed to the formation of WSON aerosols. This study provides new insights into the role of ocean-derived reactive nitrogen aerosols associated with marine microbial activity. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/87828 |
| 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: 宮崎 雄三
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