In:
Atmospheric Science Letters, Wiley, Vol. 19, No. 11 ( 2018-11)
Abstract:
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 δ 15 N of N 2 , δ 18 O of O 2 , δ(Ar/N 2 ) and δ 40 Ar. 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.
Type of Medium:
Online Resource
ISSN:
1530-261X
,
1530-261X
DOI:
10.1002/asl.2018.19.issue-11
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2025884-7
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