Gravitational separation of the stratospheric air over Syowa, Antarctica and its connection with meteorological fields
Gravitational separation of the stratospheric air over Syowa, Antarctica and its connection with meteorological fields
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南极昭和上空平流层空气的重力分离及其与气象场的联系
DOI：
10.1002/asl.857
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
and T. Nakazawa
中科院分区：
文献类型：
--
作者：
Ishidoya;S.;S. Sugawara;Y. Inai;S. Morimoto;H. Honda;C. Ikeda;Y. Tomikawa;S. Toyoda;D. Goto;S. Aoki;and T. Nakazawa
为了研究南极夏季平流层空气的重力分离，我们在1998-2013年期间使用球载低温采样器在昭和站（69.0°S，39.6°E）高度10 - 30 km处采集了空气样品，然后分析了它们的N2 δ 15 N，O2 δ 18 O，δ（Ar/N2）和δ 40 Ar。利用它们的测量值计算的归一化质量比“δ”随高度的增加而减小，这意味着重力分离效应向上增强。观测到的平流层δ廓线一般都能被二维大气模式很好地再现，但该模式往往低估了26公里以上平流层中部的观测δ值。我们还观测到平流层中部δ垂直廓线的年际变化。后向轨迹分析表明，这种变化是由于南极上空平流层空气的水平混合每年都不同。
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.