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Investigating Local and Remote Terrestrial Influence on Air Masses at Contrasting Antarctic Sites Using Radon-222 and Back Trajectories

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Title
Investigating Local and Remote Terrestrial Influence on Air Masses at Contrasting Antarctic Sites Using Radon-222 and Back Trajectories
Other Titles
대기추적자 라돈-222와 대기 역궤적 분석을 이용하여 남극 기지로 수송되는 공기 궤에 대한 국지적및 장거리 영향 조사 분석
Authors
S.D. Chambers
E.Pereira
J.Crawford
A.D. Griffiths
L.Tositti
Hong, Sang-Bum
A.G. Williams
Park, Sangjong
Choi, Taejin
Subject
Meteorology & Atmospheric Sciences
Keywords
Radon-222; antarctica
Issue Date
2017
Citation
S.D. Chambers, et al. 2017. "Investigating Local and Remote Terrestrial Influence on Air Masses at Contrasting Antarctic Sites Using Radon-222 and Back Trajectories". JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 122(24): 1-20.
Abstract
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.
URI
http://repository.kopri.re.kr/handle/201206/6108
DOI
http://dx.doi.org/10.1002/2017JD026833
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