Seasonal variation of bromocarbons at Hateruma Island,Japan: implications for global sources |
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| Authors: | Yoko Yokouchi Takuya Saito Jiye Zeng Hitoshi Mukai Stephen Montzka |
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| Institution: | 1.National Institute for Environmental Studies,Tsukuba,Japan;2.National Oceanic and Atmospheric Administration, Earth System Research Laboratory,Boulder,USA |
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| Abstract: | High-frequency measurements of dibromomethane (CH2Br2) and bromoform (CHBr3) at Hateruma Island, in the subtropical East China Sea, were performed using automated preconcentration gas chromatography/mass spectrometry. Their baseline concentrations, found in air masses from the Pacific Ocean, were 0.65 and 0.26 ppt, respectively, in summer and 1.08 and 0.87 ppt, respectively, in winter. Air masses transported from Southeast Asia were rich in bromocarbons, suggesting strong emissions in this area. The passage of cold fronts from the Asian continent was associated with sharp increases in observed concentrations of bromocarbons derived from coastal regions of the continent. Comparison of the relationships between CH2Br2]/CHBr3] and CHBr3] in the Hateruma Island data with those in monthly mean data from 14 globally distributed U.S. National Oceanic and Atmospheric Administration ground stations suggested that these gases are produced primarily from a common process on a global scale. |
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