TY - JOUR
T1 - Gravitational separation of the stratospheric air over Syowa, Antarctica and its connection with meteorological fields
AU - Ishidoya, Shigeyuki
AU - Sugawara, Satoshi
AU - Inai, Yoichi
AU - Morimoto, Shinji
AU - Honda, Hideyuki
AU - Ikeda, Chusaku
AU - Hashida, Gen
AU - Machida, Toshinobu
AU - Tomikawa, Yoshihiro
AU - Toyoda, Sakae
AU - Goto, Daisuke
AU - Aoki, Shuji
AU - Nakazawa, Takakiyo
N1 - Funding Information:
information Institute of Space and Astronautical Science; Japan Society for the Promotion of Science; Ministry of Education, Culture, Sports, Science and Technology; National Institute of Polar ResearchThis study was made as a part of the Science Program of the Japanese Antarctic Research Expedition supported by the National Institute of Polar Research (NIPR) under the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, as well as of the NIPR General Collaboration Projects No. 24-14 and Project Research KP-3. This study was partly supported by the Japan Society for the Promotion of Science KAKENHI Grant No. 21310014. We deeply thank the Scientific Ballooning (DAIKIKYU) Research and Operation Group of the Institute of Space and Astronautical Science, JAXA. Figures and were produced with the GFD-DENNOU Library.
Funding Information:
This study was made as a part of the Science Program of the Japanese Antarctic Research Expedition supported by the National Institute of Polar Research (NIPR) under the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, as well as of the NIPR General Collaboration Projects No. 24-14 and Project Research KP-3. This study was partly supported by the Japan Society for the Promotion of Science KAKENHI Grant No. 21310014. We deeply thank the Scientific Ballooning (DAIKIKYU) Research and Operation Group of the Institute of Space and Astronautical Science, JAXA. Figures 4 and 5 were produced with the GFD-DENNOU Library.
Publisher Copyright:
© 2018 The Authors. Atmospheric Science Letters published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society.
PY - 2018/11
Y1 - 2018/11
N2 - To examine gravitational separation of the stratospheric air over Antarctica in austral summer, we collected air samples from altitudes of 10 to 30 km over Syowa Station (69.0°S, 39.6°E) using balloon-borne cryogenic samplers for the period 1998–2013, and then analyzed them for δ15N of N2, δ18O of O2, δ(Ar/N2) and δ40Ar. The normalized mass ratio “δ,” calculated using their measured values, decreases with increasing altitude, implying an upward enhancement of the gravitational separation effect. The observed stratospheric δ profiles are generally well reproduced by a two-dimensional atmospheric model, but the model tends to underestimate the observed δ values in the middle stratosphere above 26 km. We also observe interannual variation in the δ vertical profile in the middle stratosphere. A backward trajectory analysis suggests that this variation is attributable to different horizontal mixing of the stratospheric air over Antarctica from year to year.
AB - To examine gravitational separation of the stratospheric air over Antarctica in austral summer, we collected air samples from altitudes of 10 to 30 km over Syowa Station (69.0°S, 39.6°E) using balloon-borne cryogenic samplers for the period 1998–2013, and then analyzed them for δ15N of N2, δ18O of O2, δ(Ar/N2) and δ40Ar. The normalized mass ratio “δ,” calculated using their measured values, decreases with increasing altitude, implying an upward enhancement of the gravitational separation effect. The observed stratospheric δ profiles are generally well reproduced by a two-dimensional atmospheric model, but the model tends to underestimate the observed δ values in the middle stratosphere above 26 km. We also observe interannual variation in the δ vertical profile in the middle stratosphere. A backward trajectory analysis suggests that this variation is attributable to different horizontal mixing of the stratospheric air over Antarctica from year to year.
KW - Balloon-borne cryogenic air sampler
KW - Gravitational separation of the atmosphere
KW - Meteorological field
KW - Stratosphere over Antarctica
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U2 - 10.1002/asl.857
DO - 10.1002/asl.857
M3 - Article
AN - SCOPUS:85053814933
SN - 1530-261X
VL - 19
JO - Atmospheric Science Letters
JF - Atmospheric Science Letters
IS - 11
M1 - e857
ER -