On the role of tropopause folds in summertime tropospheric ozone over the eastern Mediterranean and the Middle East
On the role of tropopause folds in summertime tropospheric ozone over the eastern Mediterranean and the Middle East
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DOI：
10.5194/acp-16-14025-2016
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发表时间：
2016-11
影响因子：
6.3
通讯作者：
D. Akritidis;A. Pozzer;P. Zanis;E. Tyrlis;B. Škerlak;M. Sprenger;J. Lelieveld
中科院分区：
文献类型：
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作者：
D. Akritidis;A. Pozzer;P. Zanis;E. Tyrlis;B. Škerlak;M. Sprenger;J. Lelieveld
抽象。利用ECHAM 5/MESSy大气化学（EMAC）模式研究了对流层顶褶皱对地中海东部和中东地区夏季对流层臭氧池的贡献。在EMAC模拟对流层顶折叠事件被确定与3-D标记算法，检测折叠的网格点，其中多个交叉的动态对流层顶计算。随后，选择具有最大水平和垂直范围的事件进行进一步研究。对于这些事件的选择，我们确定了一个显着的贡献，平流层臭氧水库的高浓度的臭氧在中，低自由对流层的EMME。夏季对流层中部EMME上空臭氧含量明显增加，这是由于褶皱活动向东南方向移动和高度降低的结果。我们发现，近地面臭氧在地中海东部（EM）在夏季的年际变化相关的对流层顶褶皱和臭氧在自由对流层。
Abstract. We study the contribution of tropopause folds in the summertime pool of tropospheric ozone over the eastern Mediterranean and the Middle East (EMME) with the aid of the ECHAM5/MESSy Atmospheric Chemistry (EMAC) model. Tropopause fold events in EMAC simulations were identified with a 3-D labeling algorithm that detects folds at grid points where multiple crossings of the dynamical tropopause are computed. Subsequently the events featuring the largest horizontal and vertical extent were selected for further study. For the selection of these events we identified a significant contribution of the stratospheric ozone reservoir to the high concentrations of ozone in the middle and lower free troposphere over the EMME. A distinct increase of ozone is found over the EMME in the middle troposphere during summer as a result of the fold activity, shifting towards the southeast and decreasing altitude. We find that the interannual variability of near-surface ozone over the eastern Mediterranean (EM) during summer is related to that of both tropopause folds and ozone in the free troposphere.