Fast transport from Southeast Asia boundary layer sources to northern Europe: rapid uplift in typhoons and eastward eddy shedding of the Asian monsoon anticyclone
Fast transport from Southeast Asia boundary layer sources to northern Europe: rapid uplift in typhoons and eastward eddy shedding of the Asian monsoon anticyclone
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DOI：
10.5194/acp-14-12745-2014
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发表时间：
2014-12
影响因子：
6.3
通讯作者：
B. Vogel;G. Günther;R. Müller;J. Grooß;P. Hoor;M. Krämer;S. Müller;A. Zahn;M. Riese
中科院分区：
文献类型：
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作者：
B. Vogel;G. Günther;R. Müller;J. Grooß;P. Hoor;M. Krämer;S. Müller;A. Zahn;M. Riese
摘要。2012年9月26日，在TACTS飞机活动期间，在欧洲北部平流层最底层原位测量到对流层中CO、CH4和H2O等微量气体的增加以及平流层O3的减少。测量结果表明，这些气团明显不同于平流层背景。利用CLaMS模式的轨迹模块计算40 d后向轨迹，结果表明这些气团受到亚洲季风反气旋的影响。一些气团源自东南亚/西太平洋的边界层，在台风内迅速上升（1-2天）至亚洲季风反气旋的外缘。其后，空气包裹被亚洲季风的反气旋环流所夹带。随后的远距离输送（8-14天）增强的水汽和污染物到北欧平流层最底层，是由涡旋脱落事件引起的亚洲季风反气旋对流层空气向东输送驱动的。我们发现，台风的快速上升和亚洲季风反气旋的东涡脱落的结合是一种新的快速运输途径，可以在大约5周内将东南亚/西太平洋的边界排放带到北欧最下层的平流层。
Abstract. Enhanced tropospheric trace gases such as CO, CH4 and H2O and reduced stratospheric O3 were measured in situ in the lowermost stratosphere over northern Europe on 26 September 2012 during the TACTS aircraft campaign. The measurements indicate that these air masses clearly differ from the stratospheric background. The calculation of 40-day backward trajectories with the trajectory module of the CLaMS model shows that these air masses are affected by the Asian monsoon anticyclone. Some air masses originate from the boundary layer in Southeast Asia/West Pacific and are rapidly lifted (1–2 days) within a typhoon up to the outer edge of the Asian monsoon anticyclone. Afterwards, the air parcels are entrained by the anticyclonic circulation of the Asian monsoon. The subsequent long-range transport (8–14 days) of enhanced water vapour and pollutants to the lowermost stratosphere in northern Europe is driven by eastward transport of tropospheric air from the Asian monsoon anticyclone caused by an eddy shedding event. We found that the combination of rapid uplift by a typhoon and eastward eddy shedding from the Asian monsoon anticyclone is a novel fast transport pathway that may carry boundary emissions from Southeast Asia/West Pacific within approximately 5 weeks to the lowermost stratosphere in northern Europe.