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

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概要

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• 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 ofthe marine boundary layer (pVOCair) and in surface seawater (pVOCwater) during acruise from the subarctic to subtropical regions of the northwest Pacific in summer of2008. In the northern transition water (TWN) with high biological activity, high levelsof the three CH3Xs in surface seawater were frequently observed, probably owing totheir enhanced production by phytoplankton. Supersaturation of CH3Br was onlypresent 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 themolar concentrations of CH3Cl (CCH3Cl) and CH3I (CCH3I) sharply increased withincreasing sea surface temperature (SST) in the subtropical waters. The maximumCCH3Cl (144 pmol l−1) was present in STS water at SST = 30°C and is 1.5 times thevalue extrapolated from the previously reported relationship between CCH3Cl and SST.Photochemical production might have contributed to the production of CH3Cl andCH3I in STS water.

• 2010-10-08

著者

• SHIMIZU Takao

  Nagasaki Marine Observatory

• Kameyama Sohiko

  Graduate School Of Science Hokkaido University

• Takeda Shigenobu

  Central Research Institute of Electric Power Industry

• Tsuda Atsushi

  Atmosphere And Ocean Research Institute University Of Tokyo

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