Influence of the spatial distribution of gravity wave activity on the middle atmospheric dynamics
Influence of the spatial distribution of gravity wave activity on the middle atmospheric dynamics
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DOI：
10.5194/acp-16-15755-2016
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发表时间：
2016-12
影响因子：
6.3
通讯作者：
P. Šácha;F. Lilienthal;C. Jacobi;P. Pišoft
中科院分区：
文献类型：
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作者：
P. Šácha;F. Lilienthal;C. Jacobi;P. Pišoft
摘要。通过对GPS掩星密度剖面的分析，我们最近指出了东亚-西北太平洋（EA/NP）地区平流层低层重力波增强活动和断裂的局部区域。利用中高层大气的机制模式，通过实验研究局域GW断裂区对大尺度环流和输送的可能影响，以及引力波活动空间分布对中高层大气动力学的可能影响。结果表明，GW活度的空间分布对极涡稳定性、行星波的形成以及纬向平均剩余环流的强度和结构具有重要作用。此外，还分析了纬向不对称GW断裂对布鲁尔-多布森环流纵向变率的可能影响。最后，讨论了我们的结果对各种研究主题的影响（例如，平流层突然变暖，大气阻塞，远相关模式以及已解决和未解决阻力之间的补偿机制）。
Abstract. Analysing GPS radio occultation density profiles, we have recently pointed out a localised area of enhanced gravity wave (GW) activity and breaking in the lower stratosphere of the east Asian–northwestern Pacific (EA/NP) region. With a mechanistic model of the middle and upper atmosphere, experiments are performed to study the possible effect of such a localised GW breaking region on large-scale circulation and transport and, more generally, a possible influence of the spatial distribution of gravity wave activity on middle atmospheric dynamics. The results indicate the important role of the spatial distribution of GW activity for polar vortex stability, formation of planetary waves and for the strength and structure of zonal-mean residual circulation. Furthermore, a possible effect of a zonally asymmetric GW breaking in the longitudinal variability of the Brewer–Dobson circulation is analysed. Finally, consequences of our results for a variety of research topics (e.g. sudden stratospheric warming, atmospheric blocking, teleconnection patterns and a compensation mechanism between resolved and unresolved drag) are discussed.