Investigating Local and Remote Terrestrial Influence on Air Masses at Contrasting Antarctic Sites Using Radon‐222 and Back Trajectories
Investigating Local and Remote Terrestrial Influence on Air Masses at Contrasting Antarctic Sites Using Radon‐222 and Back Trajectories
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使用 Radon-222 和返回轨迹研究对比南极地点的本地和远程陆地对气团的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
E. Pereira
中科院分区：
文献类型：
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作者：
S. Chambers;T. Choi;S. Park;A. Williams;S. Hong;L. Tositti;A. Griffiths;J. Crawford;E. Pereira
我们报告了第一个夏天在Jang Bogo站（Terra Nova Bay）使用双滤光器进行的高灵敏度氡测量，并将其与King Sejong站（King George Island）的同时观测结果进行了对比。世宗王氡浓度具有海洋基线站的特征（0.02-0.3 Bq m - 3），而张波戈氡浓度变化很大（0.06-5.2 Bq m - 3），主要是由于暴露的沿海地面的排放（估计平均通量0.09-0.11原子cm - 2 s - 1）和较浅的大气混合深度。当风速≤3.5 m s−1时，局地氡排放的影响在两个站点都变得越来越突出。对King Sejong（62°S）的反轨迹进行的聚类分析显示，最近经过南美洲、南大洋和南极洲上空的气团之间分布相当均匀，而在Jang Bogo(75°S)， 80%的事件最近经过罗斯冰架和南极洲西部，12%的事件是天气强迫的，8%的事件与南极内部的沉降和降向流有关。当与氡浓度交叉比对时，在过去10天内表明与南半球非极地大陆有过远距离接触的回轨迹中，只有一半显示出陆地影响的实际迹象。开发了一种基于高通过滤绝对湿度的简单实施技术，用于区分主要是陆地气团、海洋气团和近海岸气团，用于表征东南极沿海站点的微量气体和气溶胶测量。
We report on the first summer of high‐sensitivity radon measurements from a two‐filter detector at Jang Bogo Station (Terra Nova Bay) and contrast them with simultaneous observations at King Sejong Station (King George Island). King Sejong radon concentrations were characteristic of a marine baseline station (0.02–0.3 Bq m−3), whereas Jang Bogo values were highly variable (0.06–5.2 Bq m−3), mainly due to emissions from exposed coastal ground (estimated mean flux 0.09–0.11 atoms cm−2 s−1) and shallow atmospheric mixing depths. For wind speeds of ≤3.5 m s−1 the influence of local radon emissions became increasingly more prominent at both sites. A cluster analysis of back trajectories from King Sejong (62°S) revealed a fairly even distribution between air masses that had passed recently over South America, the Southern Ocean, and Antarctica, whereas at Jang Bogo (75°S) 80% of events had recently passed over the Ross Ice Shelf and West Antarctica, 12% were synoptically forced over Cape Adare, and 8% were associated with subsidence over the Antarctic interior and katabatic flow to the station. When cross‐checked against radon concentrations, only half of the back trajectories ending at Jang Bogo that had indicated distant contact with nonpolar southern hemisphere continents within the past 10 days showed actual signs of terrestrial influence. A simple‐to‐implement technique based on high‐pass filtered absolute humidity is developed to distinguish between predominantly katabatic, oceanic, and near‐coastal air masses for characterization of trace gas and aerosol measurements at coastal East Antarctic sites.
DOI：
10.1111/j.1600-0889.2011.00542.x
发表时间：
2011-01
期刊：
Tellus B: Chemical and Physical Meteorology
影响因子：
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作者：
R. Weller;D. Wagenbach;M. Legrand;C. Elsässer;X. Tian-Kunze;G. König‐Langlo
通讯作者：
R. Weller;D. Wagenbach;M. Legrand;C. Elsässer;X. Tian-Kunze;G. König‐Langlo
影响因子：
1.6
作者：
Kennicutt, M. C., II;Chown, S. L.;Sutherland, W. J.
通讯作者：
Sutherland, W. J.