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Methyl halides in surface seawater and marine boundary layer of the northwest Pacific

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Title: Methyl halides in surface seawater and marine boundary layer of the northwest Pacific
Authors: Ooki, Atsushi Browse this author
Tsuda, Atsushi Browse this author
Kameyama, Sohiko Browse this author
Takeda, Shigenobu Browse this author
Itoh, Sachihiko Browse this author
Suga, Toshio Browse this author
Tazoe, Hirofumi Browse this author
Okubo, Ayako Browse this author
Yokouchi, Yoko Browse this author
Issue Date: 8-Oct-2010
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research
Volume: 115
Start Page: C10013
Publisher DOI: 10.1029/2009JC005703
Abstract: The partial pressures of methyl halides (CH3X; X = Cl, Br, or I) and of CHClF2 (HCFC‐22), which are all volatile organic compounds (VOCs), were measured in the air of the marine boundary layer (pVOCair) and in surface seawater (pVOCwater) during a cruise from the subarctic to subtropical regions of the northwest Pacific in summer of 2008. In the northern transition water (TWN) with high biological activity, high levels of the three CH3Xs in surface seawater were frequently observed, probably owing to their enhanced production by phytoplankton. Supersaturation of CH3Br was only present in TWN water, with a saturation anomaly (SCH3Br) of 0.95 [SCH3X = (pCH3Xwater − pCH3Xair)/pCH3Xair]. The highest saturation anomalies for CH3Cl (SCH3Cl = 1.6) and CH3I (SCH3I = 91) were found in the southern subtropical water (STS) with low biological production south of the subtropical front. We found that the molar concentrations of CH3Cl (CCH3Cl) and CH3I (CCH3I) sharply increased with increasing sea surface temperature (SST) in the subtropical waters. The maximum CCH3Cl (144 pmol l−1) was present in STS water at SST = 30°C and is 1.5 times the value extrapolated from the previously reported relationship between CCH3Cl and SST. Photochemical production might have contributed to the production of CH3Cl and CH3I in STS water.
Rights: Copyright 2010 American Geophysical Union.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大木 淳之

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