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首页> 外文期刊>Journal of the Atmospheric Sciences >A cautionary note on the use of meteorological analysis fields for quantifying atmospheric mixing
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A cautionary note on the use of meteorological analysis fields for quantifying atmospheric mixing

机译：关于使用气象分析场定量大气混合的警告说明

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摘要

Offline atmospheric transport models are normally driven with meteorological analyses. However, subsequent analysis fields are dynamically not consistent with each other, because they are produced in independent data assimilation cycles that lack strong dynamical constraints between each other. In this paper, it is shown that when these data are used with Lagrangian transport models, spurious mixing results from the dynamic inconsistencies. As a consequence, quantities such as potential vorticity or specific humidity that tend to be conserved along trajectories are found to be significantly less well conserved when analysis data are used than when forecast data are used for the trajectory calculations. This leads, for instance, to enhanced stratosphere-troposphere exchange. It is also shown that the dispersion of initially neighboring particles occurs more rapidly with the analysis than with the forecast data. It is therefore concluded that small-scale tracer structures develop too quickly in Lagrangian models, due to the inconsistencies between the driving wind fields.
机译：离线大气传输模型通常由气象分析驱动。但是，随后的分析字段在动态上彼此不一致，因为它们是在相互之间缺乏强大动态约束的独立数据同化循环中生成的。本文表明，当将这些数据与拉格朗日输运模型一起使用时，动态不一致会导致虚假混合。结果，发现当使用分析数据时，趋于沿轨迹守恒的量（例如潜在涡度或比湿）的守恒性远低于将预测数据用于轨迹计算时的守恒性。例如，这导致平流层-对流层交换增强。还表明，与预测数据相比，使用分析进行初始相邻粒子的分散更快。因此得出结论，由于驱动风场之间的不一致，在拉格朗日模型中小规模的示踪物结构发展得太快。

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