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Description
English: Atmos circulation in June-July-August (JJA). The pictures are zonal means, from the South Pole (at the left) to the NP at the R and from the surface (bottom, 1000 hPa) to 100 hPa (above the tropopause).

The data drawn isn't from the real world its from a climate model, but a good one (hadcm3).

Top pic: Omega (vertical velocity). To confuse you, its dP/dt so positive omega means descent and negative omega means ascent. Main feature: strong ascent just north of the equator (the sun is of course N of the equator since this is northern hemi summer) and broader decent in the southern hemi. Note that the strong descent near the SP is a katabatic feature. Note that these 2 flows completely dominate the circulation.

Mid pic: NS component of horizontal wind. Flow S-to-N is positive. Main features: surface flow S-to-N and upper level flow N-to-S to fit in with the vertical velocities in the top pic.

Bottom pic: EW component of horiz wind. Flow W-to-E is positive. Main feature: the jets, strongest in the winter hemisphere.
Date 16 September 2004 (original upload date)
Source Transferred from en.wikipedia to Commons by Computerwiz908 using CommonsHelper.
Author The original uploader was William M. Connolley at English Wikipedia.

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current15:47, 31 May 2009Thumbnail for version as of 15:47, 31 May 2009800 × 1,000 (30 KB)File Upload Bot (Magnus Manske) {{BotMoveToCommons|en.wikipedia|year={{subst:CURRENTYEAR}}|month={{subst:CURRENTMONTHNAME}}|day={{subst:CURRENTDAY}}}} {{Information |Description={{en|Atmos circulation in June-July-August (JJA). The pictures are zonal means, from the South Pole (at the
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