Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgrd..11317117t&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue D17, CiteID D17117
Other
7
Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Tides And Planetary Waves
Scientific paper
A wintertime temperature maximum can be observed at the subtropical stratopause but does not appear in the radiative equilibrium temperature distribution. This structure was well simulated using a high-resolution general circulation model and examined in detail. The stratopause temperature is latitudinally maximized in the winter subtropics because of a strong downwelling of the meridional circulation from summer tropics to winter subtropics passing above the stratopause. Its strong meridional flow consists of two parts: a strong poleward flow in the winter subtropics with nearly vertically aligned contours of absolute angular momentum (M) and a strong cross-equatorial flow toward winter hemisphere above the tropical stratopause with nearly horizontally aligned M contours. The strong poleward flow in the winter subtropics is driven by a large Eliassen-Palm (E-P) flux convergence in a small absolute vorticity region. The large E-P flux convergence is due to extratropical planetary waves and asymmetric inertial instability. On the other hand, the strong cross-equatorial flow is induced along the M contour to satisfy mass continuity with the strong poleward flow in the winter subtropics and exists in the easterly phase of S-SAO with a small latitudinal gradient of M. The easterly of S-SAO during its mature phase acts as a corridor for cross-equatorial meridional circulation, while cross-equatorial meridional circulation contributes to driving the easterly of S-SAO in its development phase.
Kawatani Yoshio
Miyazaki Kunimasa
Sato Kachishige
Takahashi Minoru
Tomikawa Yoshihiro
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