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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >SULFUR GAS FLUXES AND HORIZONTAL INHOMOGENEITIES IN THE MARINE BOUNDARY LAYER
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SULFUR GAS FLUXES AND HORIZONTAL INHOMOGENEITIES IN THE MARINE BOUNDARY LAYER

机译：海洋边界层中的硫气体通量和水平非均质性

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Real-time total gaseous sulfur concentrations were measured (sampling frequency 1 Hz) from the R/V Oceanus as part of the Atlantic Stratocumulus Transition Experiment/Marine Aerosol and Gas Exchange (ASTEX/MAGE) field campaign in the Azores during June of 1992. The measurements were used to estimate sulfur gas sea-to-air flux, determine the size scale of sulfur gas inhomogeneities in the marine boundary layer, and the timescale of sampling necessary to characterize a meaningful air mass. Using the time scale of sampling and wind speed measurements, the size scale of sampling can also be determined. Sea-to-air sulfur gas flux estimates were obtained using a variance method and the inertial-dissipation method. Values from five 1-hour measurement periods on two different days ranged from 21 to 28 mu mol/m(2) d and 11 to 17 mu mol/m(2) d, respectively. These values are above the range of 1 to 13 mu mol/m(2) d reported by Blomquist et al. (this issue) during ASTEX/MAGE, based on the dimethyl sulfide (DMS) concentration in surface seawater, using the stagnant boundary layer model of air-sea exchange. A power spectrum of the sulfur gas time series shows the contribution of each turbulent eddy size to the total signal variance. In a representation of the power spectrum, the area under any portion of the curve is proportional to variance. From these power spectra we have obtained the fraction of the total variance in ground level sulfur concentration fluctuations as a function of time. The data indicate that air samples should be integrated for 1000 s for ground-based measurements. [References: 39]
机译：作为1992年6月在亚速尔群岛进行的大西洋层积积过渡实验/海洋气溶胶和气体交换（ASTEX / MAGE）野外活动的一部分，从R / V Oceanus测量了实时总气态硫浓度（采样频率1 Hz）。这些测量值用于估算硫海气通量，确定海洋边界层中硫气非均质性的尺度，以及表征有意义的空气质量所需的采样时间尺度。使用采样的时间尺度和风速测量，还可以确定采样的尺度。使用方差法和惯性耗散法获得了海空硫通量估计值。在两个不同日期的五个1小时测量周期中的值分别为21至28μmol/ m（2）d和11至17μmol/ m（2）d。这些值高于Blomquist等人报道的1至13μmol/ m（2）d范围。 （本期）在ASTEX / MAGE期间，基于地表海水中的二甲基硫醚（DMS）浓度，使用气-海交换的停滞边界层模型。硫气时间序列的功率谱显示了每个湍流涡流大小对总信号方差的贡献。在功率谱的表示中，曲线任何部分下方的面积均与方差成比例。从这些功率谱中，我们获得了地面硫浓度波动随时间变化的总方差的分数。数据表明，空气样本应进行1000 s积分以进行地面测量。 [参考：39]

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