Higher‐Resolution Tropopause Folding Accounts for More Stratospheric Ozone Intrusions
Higher‐Resolution Tropopause Folding Accounts for More Stratospheric Ozone Intrusions
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DOI：
10.1029/2022gl101690
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发表时间：
2023-04
影响因子：
5.2
通讯作者：
S. Bartusek;Yutian Wu;M. Ting;C. Zheng;A. Fiore;M. Sprenger;J. Flemming
中科院分区：
文献类型：
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作者：
S. Bartusek;Yutian Wu;M. Ting;C. Zheng;A. Fiore;M. Sprenger;J. Flemming
对流层中的臭氧是一种污染物和温室气体，更好地了解其从富含臭氧的平流层的传输至关重要。对流层顶折叠，其中平流层空气向下侵入对流层，使平流层到对流层臭氧传输（STT）成为可能。然而，折叠和对流层臭氧之间的关系的系统分析，使用的数据，既可以捕获折叠的空间尺度和准确地代表对流层化学，是有限的。在这里，我们比较了高分辨率再分析ERA 5（0.25°水平，<21 hPa垂直）和低分辨率化学再分析CAMSRA（0.75°，<40 hPa）中的折叠与CAMSRA臭氧，超过1年。折叠在高分辨率下变得更加频繁，垂直分辨率占压倒性优势。在低分辨率下，更深、更复杂的褶皱几乎完全没有表现出来。更高分辨率的折叠与对流层臭氧的相关性更好（特别是沿着中纬度风暴路径，深折叠是最常见的）;因此，STT可能更容易归因于对流层顶折叠，而不是粗分辨率的折叠可以捕获。
Ozone in the troposphere is a pollutant and greenhouse gas, and it is crucial to better understand its transport from the ozone‐rich stratosphere. Tropopause folding, wherein stratospheric air intrudes downward into the troposphere, enables stratosphere‐to‐troposphere ozone transport (STT). However, systematic analysis of the relationship between folding and tropospheric ozone, using data that can both capture folding's spatial scales and accurately represent tropospheric chemistry, is limited. Here, we compare folding in high‐resolution reanalysis ERA5 (0.25° horizontal, <21 hPa vertical) and low‐resolution chemical reanalysis CAMSRA (0.75°, <40 hPa), against CAMSRA ozone, over 1 year. Folding becomes dramatically more frequent at high resolution, with vertical resolution overwhelmingly responsible. Deeper, more filamentary folding is almost entirely unrepresented at low resolution. Higher‐resolution folding is better‐correlated with tropospheric ozone (especially along midlatitude storm tracks, where deep folding is most common); STT is therefore likely more attributable to tropopause folding than coarsely‐resolved folding can capture.