Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.a32b0051s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #A32B-0051
Physics
3334 Middle Atmosphere Dynamics (0341, 0342), 3362 Stratosphere/Troposphere Interactions
Scientific paper
Radiosonde temperature measurements at 100 hPa show cooling of both the tropical tropopause and the Arctic lower stratosphere in northern hemisphere winter. This is not consistent with a change in strength of the global-scale Brewer-Dobson circulation. It can be shown that Arctic temperatures (and the global-scale Brewer-Dobson circulation) are driven by dissipating planetary-scale waves which break in the extratropical stratosphere, while the tropical tropopause is driven by dissipating synoptic-scale waves which break on equatorial side of the subtropical jet. Analysis of vertical Eliassen and Palm (EP) flux through the extratropical tropopause shows that there has been a decrease in the contribution from planetary-scale waves, but an increase in the contribution from synoptic-scale waves. There has correspondingly been a decrease in EP-flux divergence in the extratropical stratosphere, but an increase in EP-flux divergence in the subtropics near the tropical tropopause. These changes in wave dissipation explain the cooling trends at the tropical tropopause and in the Arctic.
Norton Warwick
Shuckburgh E.
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