期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 10, 页码 3649-3657出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059913
关键词
organic aerosols; diacids; isoprene-SOA; North Pacific; marine aerosols
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [18067005]
- Environment Research and Technology Development Fund of the Ministry of the Environment, Japan [B-0903]
- [21710001]
- [24221001]
Atmospheric dicarboxylic acids (DCA) are a ubiquitous water-soluble component of secondary organic aerosols (SOA), which can act as cloud condensation nuclei (CCN), affecting the Earth's climate. Despite the high abundances of oxalic acid and related compounds in the marine aerosols, there is no consensus on what controls their distributions over the open ocean. Marine biological productivity could play a role in the production of DCA, but there is no substantial evidence to support this hypothesis. Here we present latitudinal distributions of DCA, oxoacids and -dicarbonyls in the marine aerosols from the remote Pacific. Their concentrations were found several times higher in more biologically influenced aerosols (MBA) than less biologically influenced aerosols. We propose isoprene and unsaturated fatty acids as sources of DCA as inferred from significantly higher abundances of isoprene-SOA tracers and azelaic acid in MBA. These results have implications toward the reassessment of climate forcing feedbacks of marine-derived SOA.
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