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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >HYDROCARBON AND HALOCARBON MEASUREMENTS AS PHOTOCHEMICAL AND DYNAMICAL INDICATORS OF ATMOSPHERIC HYDROXYL, ATOMIC CHLORINE, AND VERTICAL MIXING OBTAINED DURING LAGRANGIAN FLIGHTS
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HYDROCARBON AND HALOCARBON MEASUREMENTS AS PHOTOCHEMICAL AND DYNAMICAL INDICATORS OF ATMOSPHERIC HYDROXYL, ATOMIC CHLORINE, AND VERTICAL MIXING OBTAINED DURING LAGRANGIAN FLIGHTS

机译：在拉格朗日飞行中获得的氢和碳氢化合物作为大气中的氢氧根，原子氯和垂直混合的光化学和动态指标

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Nonmethane hydrocarbons and halocarbons were measured during two Lagrangian experiments conducted in the lower troposphere of the North Atlantic as part of the June 1992, Atlantic Stratosphere Transition Experiment/Marine Aerosol and Gas Exchange (ASTEX/MAGE) expedition. The first experiment was performed in very clean marine air. Meteorological observations indicate that the height of the marine boundary layer rose rapidly, entraining free tropospheric air. However, the free tropospheric and marine boundary layer halocarbon concentrations were too similar to allow this entrainment to be quantified by these measurements. The second Lagrangian experiment took place along the concentration gradient of an aged continental air mass advecting from Europe. The trace gas measurements confirm that the National Center for Atmospheric Research (NCAR) Electra aircraft successfully intercepted the same air mass on consecutive days. Two layers, a surface layer and a mixed layer with chemically distinct compositions, were present within the marine boundary layer. The composition of the free troposphere was very different from that of the mixed layer, making entrainment from the free troposphere evident. Concentrations of the nonmethane hydrocarbons in the Lagrangian surface layer were observed to become depleted relative to the longer-lived tetrachloroethene. A best fit to the observations was calculated using various combinations of the three parameters, loss by reaction with hydroxyl, loss by reaction with chlorine, and/or dilution from the mixed layer. These calculations provided estimated average concentrations in the surface layer for a 5-hour period from dawn to 11 UT of 0.3+/-0.5 x10(6) molecules cm(-3) for HO, and 3.3+/-1.1 x10(4) molecules cm(-3) for Cl. Noontime concentration estimates were 2.6+/-0.7 x10(6) molecules cm(-3) for HO and 6.5+/-1.4 x10(4) molecules cm(-3) for Cl. [References: 45]
机译：在1992年6月大西洋平流层过渡实验/海洋气溶胶和气体交换（ASTEX / MAGE）考察的一部分中，在北大西洋对流层下部进行的两次拉格朗日实验中，测量了非甲烷碳氢化合物和卤代烃。第一个实验是在非常干净的海洋空气中进行的。气象观测表明，海洋边界层的高度迅速上升，夹带了对流层自由空气。但是，对流层自由层和海洋边界层的卤代烃浓度太相似，无法通过这些测量来量化这种夹带。第二个拉格朗日实验是沿着从欧洲吹来的老龄大陆气团的浓度梯度进行的。痕量气体测量结果证实，国家大气研究中心（Electra）飞机连续几天成功拦截了相同的空气质量。在海洋边界层内存在两层，即表面层和化学成分不同的混合层。自由对流层的组成与混合层的组成大不相同，这使得来自自由对流层的夹带明显。相对于寿命更长的四氯乙烯，拉格朗日表层中非甲烷碳氢化合物的浓度降低了。使用以下三个参数的各种组合计算出与观测值的最佳拟合：与羟基反应的损失，与氯反应的损失和/或混合层的稀释度。这些计算提供了从黎明到11 UT的5小时内表层的估计平均浓度，其中HO的0.3 +/- 0.5 x10（6）分子cm（-3）分子为3.3 +/- 1.1 x10（4） Cl的分子cm（-3）中午浓度估计值对于HO为2.6 +/- 0.7 x10（6）分子cm（-3），对于Cl为6.5 +/- 1.4 x10（4）分子cm（-3）。 [参考：45]

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