J

Barnett, Denise; Kemp, Nan

doi:10.1007/978-1-4899-7100-5_10

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“…Midwinter sudden warmings of the southern hemisphere, in contrast, are confined to the middle and upper stratosphere and do not lead to a reversal of the polar night jet, despite the occurrence of local (i.e. not zonally averaged) temperature increases of similar magnitude to those reported in the north (Labitzke and van Loon 1972;Barnett 1975a).…”

Section: Introduction ( a ) Motivationmentioning

confidence: 69%

“…As consequences of these differences or at least intimately connected with them are differences in stratospheric zonal mean wind and temperature structure between hemispheres and the differences in distribution of total ozone (Dutsch 1971;Maeda and Heath 1983) which point to different Lagrangian mean circulations. A secondary but not negligible cause of inter-hemispheric differences is the variation in incident radiation brought about by the ellipticity of the earth's orbit around the sun (Barnett 1974).…”

Section: Introduction ( a ) Motivationmentioning

confidence: 99%

“…With these things in mind we have studied wave growth and wave-mean flow interaction in the southern hemisphere for an unusually large warming event which occurred near 26 July 1974. This event has been discussed briefly by Barnett (1975a). Section 2 below gives a synoptic description of the waves and the evolution of the zonal mean radiances and winds.…”

Section: Introduction ( a ) Motivationmentioning

confidence: 99%

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A sudden warming in the middle atmosphere of the southern hemisphere

Al-Ajmi

Harwood

Miles

1985

Quart J Royal Meteoro Soc

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This paper presents a case study of a wave‐mean flow interaction, or minor warming, near the southern hemisphere stratopause for 15‐30 July 1974. the analysis is based mainly on data from the selective chopper radiometer carried by Nimbus 5. A deceleration of the zonal mean wind of 70 m s‐1 from 20 to 25 July is observed in middle latitudes at 0.5 mb, with an acceleration further south. the polar vortex is, however, not disrupted. Eliassen‐Palm cross‐sections are presented for the event and a good correlation found between the E‐P flux convergence and the deceleration. the channelling of the E‐P fluxes from the tropopause to the convergent region is in broad agreement with the distribution of refractive index but there is a region of E‐P flux divergence at high levels in polar latitudes suggesting a source of wave activity there. The residual circulation is calculated both from the momentum budget and from an omega equation, both methods diagnosing a region of modest equatorward flow near the region of E‐P flux divergence embedded in the stronger poleward flow elsewhere. Maps of potential vorticity on the isentropic surface of 0 = 1640 K are presented and the evolving pattern related to zonal mean and isobaric descriptions. the event is shown to be associated with an incursion of low latitude air into middle latitudes with a corresponding irreversible mixing of potential vorticity reminiscent of the ‘wave breaking’ in northern hemisphere events reported by McIntyre and Palmer (J. At. Ter. Ph., 46, 825), but of much smaller amplitude.

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Section: Introduction ( a ) Motivationmentioning

confidence: 69%

Section: Introduction ( a ) Motivationmentioning

confidence: 99%

Section: Introduction ( a ) Motivationmentioning

confidence: 99%

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