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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >ATMOSPHERIC SULFUR CYCLING IN THE TROPICAL PACIFIC MARINE BOUNDARY LAYER (12-DEGREES-S,135-DEGREES-W) - A COMPARISON OF FIELD DATA AND MODEL RESULTS .1. DIMETHYLSULFIDE
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ATMOSPHERIC SULFUR CYCLING IN THE TROPICAL PACIFIC MARINE BOUNDARY LAYER (12-DEGREES-S,135-DEGREES-W) - A COMPARISON OF FIELD DATA AND MODEL RESULTS .1. DIMETHYLSULFIDE

机译：热带太平洋海洋边界层（12度-S，135度-W）中的大气硫循环-实地数据与模型结果的比较1。二甲基硫醚

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Shipboard measurements of atmospheric and seawater DMS were made at 12 degrees S, 135 degrees W for 6 days during March 1992. The mean seawater DMS concentration during this period was 4.1 +/- 0.45 nM (1 sigma, n = 260) and the mean atmospheric DMS mole fraction was 453 +/- 93 pmol mol(-1) (1 sigma, n = 843). Consistent atmospheric diel cycles were observed, with a nighttime maximum and daytime minimum and an amplitude of approximately 85 pmol mol(-1). Photochemical box model calculations were made to test the sensitivity of atmospheric DMS concentrations to the following parameters: 1) sea-to-air flux, 2) boundary layer height, 3) oxidation rate, and 4) vertical entrainment velocities. The observed relationship between the mean oceanic and atmospheric DMS levels require the use of an air-sea exchange coefficient which is at the upper limit end of the range of commonly used parameterizations. The amplitude of the diel cycle in atmospheric DMS is significantly larger than that predicted by a photochemical model. This suggests that the sea-to-air DMS flux is higher than was previously thought, and the rate of daytime oxidation of DMS is substantially underestimated by current photochemical models of DMS oxidation. [References: 70]
机译：在1992年3月期间，船上对大气和海水DMS的测量是在12华氏度，135华氏度的情况下进行的，为期6天。在此期间，海水DMS的平均浓度为4.1 +/- 0.45 nM（1 sigma，n = 260），平均值为大气DMS摩尔分数为453 +/- 93 pmol mol（-1）（1 sigma，n = 843）。观察到一致的大气diel周期，最大夜间和最小白天，振幅约为85 pmol mol（-1）。进行光化学箱模型计算以测试大气DMS浓度对以下参数的敏感性：1）海对空通量，2）边界层高度，3）氧化速率和4）垂直夹带速度。观测到的海洋和大气DMS平均水平之间的关系需要使用海气交换系数，该系数在常用参数设置范围的上限。大气DMS中diel循环的幅度明显大于光化学模型预测的幅度。这表明海空DMS通量比以前认为的要高，并且当前DMS氧化的光化学模型大大低估了DMS的日间氧化速率。 [参考：70]

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