Open AccessFormation of an ozone lamina due to differential advection revealed by intensive observations
Author(s) -
Tomikawa Yoshihiro,
Sato Kaoru,
Kita Kazuyuki,
Fujiwara Masatomo,
Yamamori Miho,
Sano Takuki
Publication year - 2002
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2001jd000386
Subject(s) - advection , geology , jet stream , atmospheric sciences , stratosphere , potential vorticity , atmosphere (unit) , depth sounding , climatology , geophysics , jet (fluid) , meteorology , vorticity , physics , vortex , mechanics , oceanography , thermodynamics
An intensive observation with ozonesondes, radiosondes, and the Middle and Upper atmosphere (MU) radar was conducted at Shigaraki (34.9°N, 136.1°E), Japan, from 16 through 24 April 1998 to investigate the formation mechanism of ozone laminae in the midlatitude lower stratosphere. In these observations the temporal variation of an ozone lamina at Shigaraki was continuously observed through a short time interval of 8 hours. During the observation period an ozone lamina with a thickness of 2–3 km appeared and ascended with a speed of ∼1 km day −1 in the height region of 18–21 km. It is deduced that inertia gravity waves existing in this height region did not contribute to formation of the ozone lamina, because their amplitudes were too small and their vertical phase propagation was in the opposite direction. The reverse domain filling method was used to reconstruct the “high‐resolution” modified potential vorticity field using backward trajectory calculations. The results indicate that this ozone lamina was caused by differential advection due to the vertical shear associated with the subtropical westerly jet and embedded stationary Rossby wave therein. This means that large‐scale motions concurrent with vertical wind shear can produce much smaller‐scale structures in material fields than those of the large‐scale motions themselves.