In-situ observation of Asian pollution transported into the Arctic lowermost stratosphere
In-situ observation of Asian pollution transported into the Arctic lowermost stratosphere
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DOI：
10.5194/acp-11-10975-2011
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发表时间：
2011-11
影响因子：
6.3
通讯作者：
A. Roiger;H. Schlager;A. Schäfler;H. Huntrieser;M. Scheibe;H. Aufmhoff;O. Cooper;H. Sodemann;A. Stohl;J. Burkhart;M. Lazzara;C. Schiller;K. Law;F. Arnold
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文献类型：
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作者：
A. Roiger;H. Schlager;A. Schäfler;H. Huntrieser;M. Scheibe;H. Aufmhoff;O. Cooper;H. Sodemann;A. Stohl;J. Burkhart;M. Lazzara;C. Schiller;K. Law;F. Arnold
在2008年7月10日的一次研究飞行中，德国研究飞机“猎鹰”号在北极平流层最低层对一个一氧化碳、过氧乙酰硝酸盐和水蒸气混合比例异常高的气团进行了采样。在动力对流层顶上方约800米的11.3公里高度上，两次遇到该气团。对臭氧、NO和NOy的现场测量表明，这一层是一个混合空气团，包含来自对流层和平流层的空气。后向轨迹和拉格朗日粒子扩散模型分析表明，猎鹰号对源自东亚沿海地区的污染气团顶部进行了采样。人为污染羽流经历了强大的上升，在温暖的传送带（WCB）位于俄罗斯东海岸。随后，亚洲气团穿过北极进入采样区，使当地对流层顶升高约3公里。与周围的北极平流层空气的混合最有可能发生在水平传输时，对流层拖缆被拉伸成长而窄的细丝。该机制可能是污染物向极地对流层顶输送的重要途径。
On a research flight on 10 July 2008, the German research aircraft Falcon sampled an air mass with unusually high carbon monoxide (CO), peroxyacetyl nitrate (PAN) and water vapour (H2O) mixing ratios in the Arctic lowermost stratosphere. The air mass was encountered twice at an altitude of 11.3 km, ~800 m above the dynamical tropopause. In-situ measurements of ozone, NO, and NOy indicate that this layer was a mixed air mass containing both air from the troposphere and stratosphere. Backward trajectory and Lagrangian particle dispersion model analysis suggest that the Falcon sampled the top of a polluted air mass originating from the coastal regions of East Asia. The anthropogenic pollution plume experienced strong up-lift in a warm conveyor belt (WCB) located over the Russian east-coast. Subsequently the Asian air mass was transported across the North Pole into the sampling area, elevating the local tropopause by up to ~3 km. Mixing with surrounding Arctic stratospheric air most likely took place during the horizontal transport when the tropospheric streamer was stretched into long and narrow filaments. The mechanism illustrated in this study possibly presents an important pathway to transport pollution into the polar tropopause region.