Winds and Wave Motions to 110 km at Mid-Latitudes. III. Response of Mesospheric and Thermospheric Winds to Major Stratospheric Warmings

Gregory, J. B.; Manson, A. H.

doi:10.1175/1520-0469(1975)032<1676:wawmtk>2.0.co;2

Cited by 38 publications

(17 citation statements)

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“…The interaction decelerates and/or reverses the eastward winter winds in the stratosphere-mesosphere system and also induces a downward circulation in the stratosphere causing adiabatic heating and an upward circulation in the mesosphere resulting in adiabatic cooling Roble, 2002, 2005;Coy et al, 2005). These basic features of the stratospheremesosphere manifestation of the SSW have been supported by many observations (Lysenko et al, 1975;Gregory and Manson, 1975;Myrabø et al, 1984;Cevolani, 1989;Manson and Meek, 1991;Singer et al, 1992;Whiteway and Carswell, 1994;Hoffmann et al, 2002Hoffmann et al, , 2007Jacobi et al, 2003;Dowdy et al, 2004;Walterscheid et al, 2000;Hernandez, 2003;Cho et al, 2004;Siskind et al, 2005;.…”

Section: Introductionmentioning

confidence: 71%

Latitudinal wave coupling of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004

et al. 2008

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Abstract. The coupling of the dynamical regimes in the high-and low-latitude stratosphere and mesosphere during the major SSW in the Arctic winter of 2003/2004 has been studied. The UKMO zonal wind data were used to explore the latitudinal coupling in the stratosphere, while the coupling in the mesosphere was investigated by neutral wind measurements from eleven radars situated at high, highmiddle and tropical latitudes. It was found that the inverse relationship between the variability of the zonal mean flows at high-and low-latitude stratosphere related to the SSW is produced by global-scale zonally symmetric waves. Their origin and other main features have been investigated in detail. Similar latitudinal dynamical coupling has been found for the mesosphere as well. Indirect evidence for the presence of zonally symmetric waves in the mesosphere has been found.

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Section: Introductionmentioning

confidence: 71%

Latitudinal wave coupling of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004

et al. 2008

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“…events of 5-10 days within regional or major SSW, there is again significant but more temporary movement or migration of the stratospheric polar vortex to its frequent position over Scandinavia in January/February (2005, 2007, and following observed westward rotation of the vortex-structure, the presence of the mesospheric vortex over Eureka-Eastern Pacific (Chshyolkova et al, 2007Manson et al, 2008;Xu et al, 2009). Associated with these events, the cross-polar mesospheric wind is often poleward in direction over Scandinavia; while there are the long-observed (Gregory and Manson, 1975; and references just above) reversed southward/equatorward and westward wind-components over Canada (Saskatoon, Eureka) during stratospheric warmings. …”

Section: Case Study For January 2008mentioning

confidence: 98%

Characteristics of Arctic winds at CANDAC-PEARL (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006–2009: radar observations and comparisons with the model CMAM-DAS

et al. 2011

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Abstract. Operation of a Meteor Wind Radar (MWR) atMonthly meridional (north-south, NS) 3-year means for each location/radar demonstrate that winds (82-97 km) differ significantly between Canada and Norway, with winterequinox values generally northward over Eureka and southward over Svalbard. Using January 2008 as case study, these oppositely directed meridional winds are related to mean positions of the Arctic mesospheric vortex. The vortex is from the Canadian Middle Atmosphere Model, with its Data Assimilation System (CMAM-DAS). The characteristics of "Sudden stratospheric Warmings" SSW in each of the three winters are noted, as well as their uniquely distinctive shortterm mesospheric wind disturbances.Comparisons of the mean winds over 36 months at 78 and 80 • N, with those within CMAM-DAS, are featured. E.g. A. H. Manson (alan.manson@usask.ca) for 2007, while both monthly mean EW and NS winds from CMAM/radar are quite similar over Eureka (82-88 km), the modeled autumn-winter NS winds over Svalbard (73-88 km) differ significantly from observations. The latter are southward, and the modeled winds over Svalbard are predominately northward. The mean positions of the winter polar vortex are related to these differences. Correspondence to:

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“…In connection with SSWs, a weakening or reversal of the dominating eastward zonal winds to summerly westward winds in the Mesosphere/Lower Thermosphere (MLT) region has first been observed by Gregory and Manson (1975). This effect is more pronounced at high northern latitudes (e.g.…”

Section: Introductionmentioning

confidence: 99%

The impact of planetary waves on the latitudinal displacement of sudden stratospheric warmings

et al. 2013

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The Northern Hemispheric winter is disturbed by large scale variability mainly caused by Planetary Waves (PWs), which interact with the mean flow and thus result in Sudden Stratospheric Warmings (SSWs). The effects of a SSW on the middle atmosphere are an increase of stratospheric and a simultaneous decrease of mesospheric temperature as well as a wind reversal to westward wind from the mesosphere to the stratosphere. In most cases these disturbances are strongest at polar latitudes, get weaker toward the south and vanish at mid-latitudes around 50° to 60° N as for example during the winter 2005/06. However, other events like in 2009, 2010 and 2012 show a similar or even stronger westward wind at mid- than at polar latitudes either in the mesosphere or in the stratosphere during the SSW. This study uses local meteor and MF-radar measurements, global satellite observations from the Microwave Limb Sounder (MLS) and assimilated model data from MERRA (Modern-ERA Retrospective analysis for research and Applications). We compare differences in the latitudinal structure of the zonal wind, temperature and PW activity between a "normal" event, where the event in 2006 was chosen representatively, and the latitudinal displaced events in 2009, 2010 and 2012. A continuous westward wind band between the pole and 20° N is observed during the displaced events. Furthermore, distinctive temperature differences at mid-latitudes occur before the displaced warmings compared to 2006 as well as a southward extended stratospheric warming afterwards. These differences between the normal SSW in 2006 and the displaced events in 2009, 2010 and 2012 are linked to an increased PW activity between 30° N and 50° N and the changed stationary wave flux in the stratosphere around the displaced events compared to 2006

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Winds and Wave Motions to 110 km at Mid-Latitudes. III. Response of Mesospheric and Thermospheric Winds to Major Stratospheric Warmings

Cited by 38 publications

References 0 publications

Latitudinal wave coupling of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004

Latitudinal wave coupling of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004

Characteristics of Arctic winds at CANDAC-PEARL (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006–2009: radar observations and comparisons with the model CMAM-DAS

The impact of planetary waves on the latitudinal displacement of sudden stratospheric warmings

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