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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Model study of a stratospheric intrusion event at lower midlatitudes associated with the development of a cutoff low
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Model study of a stratospheric intrusion event at lower midlatitudes associated with the development of a cutoff low

机译：低纬度地区平流层侵入事件与临界低点发展相关的模型研究

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摘要

A tropopause folding event associated with the development of a cutoff low over southeastern Europe at the end of March 1995 enhanced the ozone concentrations in the upper troposphere. The episode has been simulated using a coupled chemistry-general circulation model that has been "nudged" toward actual meteorology using a simple four-dimensional assimilation technique based on European Centre for Medium-Range Weather Forecasts data. Model results are compared with ozone observations and analyzed meteorological data. In particular, simulated geopotential heights shows a realistic representation of the synoptic development of the cutoff low system. The model also succesfully reproduces the space-time evolution of potential vorticity and specific humidity fields associated with the tropopause fold. Furthermore, modeled ozone concentrations during that period show a pronounced increase in the upper troposphere associated with downward fluxes from the stratosphere. The total amount of stratospheric ozone transferred into the troposphere during the event is estimated at 6.4 * 10~8 kg. The results of the present simulation indicate that the model provides a useful tool to simulate stratosphere-troposphere exchange and its effect on global tropospheric ozone, and that the model representation of the large-scale wave forcing is more important than the fine details of tropopause foldings.
机译：与1995年3月底欧洲东南部一个临界低值的发展有关的对流层顶折叠事件增强了对流层上部的臭氧浓度。该事件已使用化学-常规循环模型进行了模拟，该模型已使用基于欧洲中距离天气预报中心数据的简单四维同化技术“推向”实际气象。将模型结果与臭氧观测值进行比较，并分析气象数据。特别是，模拟的地势高度显示了临界低系统的天气发展的现实表现。该模型还成功地再现了与对流层顶褶皱相关的潜在涡度和特定湿度场的时空演化。此外，在那段时期内模拟的臭氧浓度显示，与来自平流层的向下通量有关的对流层上部明显增加。事件期间转移到对流层的平流层臭氧总量估计为6.4 * 10〜8 kg。本次模拟的结果表明，该模型为模拟平流层-对流层交换及其对全球对流层臭氧的影响提供了有用的工具，而且大规模对流强迫的模型表示比对流层顶褶皱的精细细节更为重要。 。

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