title: Characterization of Chromophoric Water-Soluble Organic Matter in Urban, Forest, and Marine Aerosols by HR-ToF-AMS Analysis and Excitation-Emission Matrix Spectroscopy.
abstract: Chromophoric water-soluble organic matter in atmospheric aerosols potentially plays an important role in aqueous reactions and light absorption by organics. The fluorescence and chemical-structural characteristics of the chromophoric water-soluble organic matter in submicron aerosols collected in urban, forest, and marine environments (Nagoya, Kii Peninsula, and the tropical Eastern Pacific) were investigated using excitation-emission matrices (EEMs) and a high-resolution aerosol mass spectrometer. A total of three types of water-soluble chromophores, two with fluorescence characteristics similar to those of humiclike substances (HULIS-1 and HULIS-2) and one with fluorescence characteristics similar to those of protein compounds (PLOM), were identified in atmospheric aerosols by parallel factor analysis (PARAFAC) for EEMs. We found that the chromophore components of HULIS-1 and -2 were associated with highly and less-oxygenated structures, respectively, which may provide a clue to understanding the chemical formation or loss of organic chromophores in atmospheric aerosols. Whereas HULIS-1 was ubiquitous in water-soluble chromophores over different environments, HULIS-2 was abundant only in terrestrial aerosols, and PLOM was abundant in marine aerosols. These findings are useful for further studies regarding the classification and source identification of chromophores in atmospheric aerosols.
authors: Qingcai
authors: Q
authors: Chen
authors: Institute of Low Temperature Science, Hokkaido University , Sapporo 060-0819, Japan.
authors: Yuzo
authors: Y
authors: Miyazaki
authors: Institute of Low Temperature Science, Hokkaido University , Sapporo 060-0819, Japan.
authors: Kimitaka
authors: K
authors: Kawamura
authors: Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi , Kofu 400-8510, Japan.
authors: Kiyoshi
authors: K
authors: Matsumoto
authors: Sean
authors: S
authors: Coburn
authors: Rainer
authors: R
authors: Volkamer
authors: Yoko
authors: Y
authors: Iwamoto
authors: Sara
authors: S
authors: Kagami
authors: Yange
authors: Y
authors: Deng
authors: Shuhei
authors: S
authors: Ogawa
authors: Graduate School of Global Environmental Studies, Kyoto University , Kyoto 606-8501, Japan.
authors: Sathiyamurthi
authors: S
authors: Ramasamy
authors: Department of Applied Chemistry, Tokyo Metropolitan University , Tokyo 192-0397, Japan.
authors: Shungo
authors: S
authors: Kato
authors: Graduate School of Global Environmental Studies, Kyoto University , Kyoto 606-8501, Japan.
authors: Akira
authors: A
authors: Ida
authors: Graduate School of Global Environmental Studies, Kyoto University , Kyoto 606-8501, Japan.|Center for Regional Environmental Research, National Institute for Environmental Studies , Tsukuba 305-8506, Japan.
authors: Yoshizumi
authors: Y
authors: Kajii
authors: Michihiro
authors: M
authors: Mochida
mesh_terms: D000336:Aerosols; D065928:Forests; D006812:Humic Substances; D009930:Organic Chemicals / Q000737:chemistry*; D013057:Spectrum Analysis; D014867:Water / Q000737:chemistry*
chemical_list: D000336:Aerosols; D006812:Humic Substances; D009930:Organic Chemicals; D014867:Water