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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >VARIATIONS IN TROPOSPHERIC OZONE RELATED TO TRANSPORT AT AMERICAN SAMOA
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VARIATIONS IN TROPOSPHERIC OZONE RELATED TO TRANSPORT AT AMERICAN SAMOA

机译：与美国萨摩亚运输有关的对流臭氧变化

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摘要

Ten years of isentropic trajectories were summarized using cluster analysis to describe flow patterns for American Samoa. The trajectories were then paired with surface ozone data to determine the dependence of surface ozone on transport. The two main transport regimes affecting surface ozone are trade wind transport, where trajectories show flow bringing ozone from the east in the tropical marine boundary layer, and midlatitude transport, where trajectories show strong westerly flow at higher elevations of southern midlatitudes, followed by descent with anticyclonic curvature. These two transport regimes yield ozone from distinctly different origins, having different mixing ratios. The seasonally changing frequency of transport type is shown to be partly responsible for the seasonal cycle and changes in variability of Samoa surface ozone. On average, 45% of winter ozone variation can be explained by differences in transport type. This strong relationship was absent, however, during 1991, probably because of UV blocking by aerosols from the eruption of Mount Pinatubo. Reduced total column ozone during winter 1992 may have contributed to this season having the lowest surface ozone levels of the study period. [References: 25]
机译：使用聚类分析总结了十年的等熵轨迹，以描述美属萨摩亚的流动模式。然后将轨迹与表面臭氧数据配对，以确定表面臭氧对运输的依赖性。影响地面臭氧的两个主要运输方式是贸易风运输，其中轨迹显示气流从东部带入热带海洋边界层，而中纬度运输中轨迹在较高的南中纬度海拔显示强西风，随后下降。反气旋弯曲。这两种传输方式产生的臭氧明显不同，混合比也不同。事实表明，运输类型的季节性变化是造成萨摩亚表面臭氧季节性变化和变化的部分原因。平均而言，冬季臭氧变化的45％可以通过运输类型的差异来解释。但是，在1991年期间没有这种紧密的关系，这可能是由于皮纳图博火山喷发引起的气溶胶对紫外线的阻挡。在1992年冬季，塔中总臭氧量的减少可能是本季节研究期间最低的地面臭氧水平造成的。 [参考：25]

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