Large-Scale Temperature Changes in the Stratosphere Observed from Nimbus III

Fritz, Sigmund; Soules, S. D.

doi:10.1175/1520-0469(1970)027<1091:lstcit>2.0.co;2

Cited by 107 publications

(55 citation statements)

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“…These strong stratospheric warmings are connected with widespread downward motion over the Arctic and middle high latitudes. At the same time upward motion and adiabatical cooling takes place outside the high latitudes, over the rest of the Northern Hemisphere and far into the Southern Hemisphere, as observed first with satellite data by Fritz and Soules (1970). And the result is shown above in Fig.…”

Section: Northern Hemisphere: Februarysupporting

confidence: 65%

The Solar Signal of the 11-Year Sunspot Cycle in the Stratosphere: Differences between the Northern and Southern Summers.

Labitzke

2002

Journal of the Meteorological Society of Japan

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The size of the changes of the stratospheric heights and temperatures which can be attributed to the 11-year sunspot cycle (SSC) is discussed with emphasis on the summer seasons. It is pointed out that the signal is strong and consistent during the northern summer, but weak during the southern summer, January/February. During this time of year the northern winters are dynamically very disturbed and the global signal of the SSC is modulated by the QBO.The study puts earlier work on a firmer ground and gives the community of modellers who simulate the solar signal with GCMs quantitative values for comparison.

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Section: Northern Hemisphere: Februarysupporting

confidence: 65%

The Solar Signal of the 11-Year Sunspot Cycle in the Stratosphere: Differences between the Northern and Southern Summers.

Labitzke

2002

Journal of the Meteorological Society of Japan

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“…Delisi and Dunkerton (1988 noted correlation between eastward phase of stratospheric QBO and sudden stratospheric warming events occurring at mid latitudes. Using observations from the Nimbus 3 satellite, Fritz and Soules (1970) were the first to show that the perturbations in the stratosphere at the higher latitudes are related to those at the tropics: the SSW at high latitudes in winter was accompanied by simultaneous cooling in the tropical winter stratosphere and in the summer hemisphere. Mukherjee (1990) observed in rocketsonde temperatures low latitude cooling in stratosphere and warming in mesosphere during the SSW events.…”

Section: Discussionmentioning

confidence: 99%

Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)

Sridharan

Sathishkumar²

2008

Ann. Geophys.

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Abstract. The Mesosphere and Lower Thermosphere (MLT) winds acquired by medium frequency (MF) radar at Tirunelveli (8.7 • N, 77.8 • E) for the years 1993-2007 are used to study seasonal and interannual variabilities of gravity wave (GW) variances in the altitude region 84-94 km. The GW variances in zonal and meridional winds show semiannual oscillation with maximum variance during March-April and August-September and minimum during June-July and November-December months. The wind variances, in general, are observed to be enhanced during and after the year 1998 and they undergo large interannual variability, in particular, during spring equinox months. An enhancement of GW variances is observed during spring equinox months of the years 2000, 2004 and 2006. These larger GW enhancements, most of the times, coincide with eastward phase of zonally averaged stratospheric QBO at 30 hPa over equator and sudden stratospheric warming occurred at high latitudes. From the zonal and meridional variances, the perturbation ellipses are calculated and they show that the predominant direction of propagation of gravity waves is in SE-NW plane.

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“…Early satellite measurements showed that enhanced poleward eddy heat fluxes in the extratropical stratosphere induce tropical cooling through changes in the mean meridional circulation (Fritz and Soules, 1970;Plumb and Eluszkiewicz, 1999;Randel et al, 2002). It is generally believed that such changes in the stratosphere do not affect the troposphere, due to the difference in air density between the two.…”

Section: Introductionmentioning

confidence: 99%

The role of convective overshooting clouds in tropical stratosphere–troposphere dynamical coupling

et al. 2015

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Abstract. This paper investigates the role of deep convection and overshooting convective clouds in stratospheretroposphere dynamical coupling in the tropics during two large major stratospheric sudden warming events in January 2009 and January 2010. During both events, convective activity and precipitation increased in the equatorial Southern Hemisphere as a result of a strengthening of the BrewerDobson circulation induced by enhanced stratospheric planetary wave activity. Correlation coefficients between variables related to the convective activity and the vertical velocity were calculated to identify the processes connecting stratospheric variability to the troposphere. Convective overshooting clouds showed a direct relationship to lower stratospheric upwelling at around 70-50 hPa. As the tropospheric circulation change lags behind that of the stratosphere, outgoing longwave radiation shows almost no simultaneous correlation with the stratospheric upwelling. This result suggests that the stratospheric circulation change first penetrates into the troposphere through the modulation of deep convective activity.

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Large-Scale Temperature Changes in the Stratosphere Observed from Nimbus III

Cited by 107 publications

References 0 publications

The Solar Signal of the 11-Year Sunspot Cycle in the Stratosphere: Differences between the Northern and Southern Summers.

The Solar Signal of the 11-Year Sunspot Cycle in the Stratosphere: Differences between the Northern and Southern Summers.

Seasonal and interannual variations of gravity wave activity in the low-latitude mesosphere and lower thermosphere over Tirunelveli (8.7° N, 77.8° E)

The role of convective overshooting clouds in tropical stratosphere–troposphere dynamical coupling

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