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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Representing the effects of stratospherea??troposphere exchange on 3-D Osub3/sub distributions in chemistry transport models using a potential vorticity-based parameterization
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Representing the effects of stratospherea??troposphere exchange on 3-D Osub3/sub distributions in chemistry transport models using a potential vorticity-based parameterization

机译：使用基于潜在涡度的参数化表示平流层—对流层交换对化学迁移模型中3-D O 3 分布的影响

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pstrongAbstract./strong Downward transport of ozone (Osub3/sub) from the stratosphere can be a significant contributor to tropospheric Osub3/sub background levels. However, this process often is not well represented in current regional models. In this study, we develop a seasonally and spatially varying potential vorticity (PV)-based function to parameterize upper tropospheric and/or lower stratospheric (UTLS) Osub3/sub in a chemistry transport model. This dynamic Osub3/suba??PV function is developed based on 21-year ozonesonde records from World Ozone and Ultraviolet Radiation Data Centre (WOUDC) with corresponding PV values from a 21-year Weather Research and Forecasting (WRF) simulation across the Northern Hemisphere from 1990 to 2010. The result suggests strong spatial and seasonal variations of Osub3/subspan class="thinspace"/spana??span class="thinspace"/spanPV ratios which exhibits large values in the upper layers and in high-latitude regions, with highest values in spring and the lowest values in autumn over an annual cycle. The newly developed Osub3/subspan class="thinspace"/spana??span class="thinspace"/spanPV function was then applied in the Community Multiscale Air Quality (CMAQ) model for an annual simulation of the year 2006. The simulated UTLS Osub3/sub agrees much better with observations in both magnitude and seasonality after the implementation of the new parameterization. Considerable impacts on surface Osub3/sub model performance were found in the comparison with observations from three observational networks, i.e., EMEP, CASTNET and WDCGG. With the new parameterization, the negative bias in spring is reduced from a??20 to a??15span class="thinspace"/span% in the reference case to a??9 to a??1span class="thinspace"/span%, while the positive bias in autumn is increased from 1 to 15span class="thinspace"/span% in the reference case to 5 to 22span class="thinspace"/span%. Therefore, the downward transport of Osub3/sub from upper layers has large impacts on surface concentration and needs to be properly represented in regional models./p.
机译：> >摘要。平流层中臭氧（O 3 ）的向下传输可能是对流层O 3 背景水平的重要贡献。但是，在当前的区域模型中通常无法很好地体现这一过程。在这项研究中，我们开发了一个基于季节和空间变化的潜在涡度（PV）函数，以在化学迁移模型中参数化对流层上层和/或平流层下层（UTLS）O 3 。这个动态的O 3 a ?? PV功能是根据世界臭氧和紫外线辐射数据中心（WOUDC）的21年臭氧探空仪记录以及21年天气研究和预报（ WRF）1990年至2010年在北半球的模拟。结果表明O 3 class =“ thinspace”> a ?? class =“ Thinspace“> PV比率在上一年和高纬度地区表现出较大的值，在整个年度周期中，春季最高，秋季最低。然后将新开发的O 3 class =“ thinspace”> a ?? class =“ thinspace”> PV函数应用于社区多尺度空气质量（CMAQ）模型用于2006年的年度模拟。新参数化实施后，模拟的UTLS O 3 与数量级和季节性方面的观察结果更加吻合。与来自EMEP，CASTNET和WDCGG三种观测网络的观测结果进行比较，发现它们对表面O 3 模型的性能有相当大的影响。通过新的参数设置，弹簧中的负偏压在参考情况下从a ?? 20降低到a ?? 15 class =“ thinspace”> ％，从a ?? 9降低到a ?? 1 < span class =“ thinspace”> ％，而秋季的正偏差从参考案例中的1增加到15 class =“ thinspace”> “ thinspace”> ％。因此，O 3 从上层向下的迁移对地表浓度影响较大，需要在区域模型中适当地表示。

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