Free amino acids in marine aerosols over the western North Pacific Ocean |
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| Institution: | 1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, China;2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;3. CAS Center for Excellence in Quaternary Science and Global Change, Xi''an 710061, China;4. Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, United States;5. Hong Kong Premium Services and Research Laboratory, Kowloon, Hong Kong SAR, China;6. Xi''an Institute for Innovative Earth Environment Research, Xi''an 710061, China;7. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;8. Xianghe Observatory of Whole Atmosphere, Institute of Atmospheric Physics, Chinese Academy of Sciences, Xianghe 065400, China;1. Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, 04510 México, D.F., Mexico;2. Istituto di Scienze dell''Atmosfera e del Clima-CNR, Via P. Gobetti 101, 40129 Bologna, Italy |
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| Abstract: | Atmospheric input of fixed nitrogen species to the ocean has attracted considerable attention from the viewpoint of the oceanic biogeochemical cycle of nitrogen, although few measurements of organic nitrogen compounds in atmospheric aerosols have been extensively conducted over remote ocean areas. In this study, we report the geographical distribution of dissolved free amino acids (DFAA) in the water-soluble fraction of two size-segregated marine aerosols over the western North Pacific. The concentrations of DFAA showed higher values over the region north of 30°N, whereas they clearly decreased south of 30°N. Approximately 59–96% of DFAA was found in fine-mode particles. Long-range transport from continental sources could largely contribute to DFAA in marine aerosols over the remote North Pacific. |
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