Large-scale thermodynamics of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004

Mukhtarov, Plamen; Pancheva, D.; Andonov, B.; Mitchell, N. J.; Merzlyakov, E. G.; Singer, W.; Hocking, W. K.; Meek, C. E.; Manson, A. H.; Murayama, Yasuhiro

doi:10.1016/j.jastp.2007.07.012

Cited by 29 publications

(32 citation statements)

References 37 publications

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“…They found no evidence for a continuous westward wind band between the pole and 20 • N in the average behaviour of a warming in the lower stratosphere up to 32 km. This polar activity of SSW effects without a continuous westward wind band from the pole to lower latitudes is also observed in case studies for individual events, as for example in Hoffmann et al (2007) and especially in Mukhtarov et al (2007). Therefore, the events studied here are exceptional even if they occur in a temporally short interval.…”

Section: Discussionsupporting

confidence: 75%

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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Section: Discussionsupporting

confidence: 75%

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

et al. 2013

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“…in zonal mean temperature. Mukhtarov et al (2007) using the UK Met. Office (UKMO) data investigated the latitudinal structure of the genuine stratospheric anomalies (emphasized by removing the UKMO climatology) related to the major SSW in the Arctic winter of 2003/2004 and found that: (i) warmings at high latitudes are associated with coolings at low-middle and tropical latitudes, and (ii) negative zonal mean zonal wind anomalies (deceleration/reversal of the eastward winter flow) at high latitudes are linked with the positive (amplification of the eastward flow) anomalies at low-middle and tropical latitudes; these effects are particularly strong in the upper stratosphere.…”

Section: Introductionmentioning

confidence: 99%

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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“…In 2003/2004 winter when we concentrate our case on, a major SSW event is found in north hemisphere that led to polar vortex disruption [37]. Pancheva and Mukhtarov et al [20][21][22] extracted 11-and 17-day waves in the stratosphere at the same time. Our study also confirms the remarkable existences of quasi 10-day and quasi-16-day waves there.…”

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confidence: 96%

“…Meanwhile, a few researchers have paid attention to stratosphere [20][21][22]. However, troposphere, where PWs originate, is rarely studied and reported.…”

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Radiosonde observations of high-latitude planetary waves in the lower atmosphere

Wang

Zhang

Fan

2010

Sci. China Earth Sci.

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The characteristics of high-latitude planetary waves (PWs) in the troposphere and lower stratosphere (TLS) are studied by using the data from radiosonde observations during 1998 to 2006 at three Alaskan stations in USA (Nome, 64.50°N, 165.43°W; McGrath, 62.97°N, 155.62°W; Fairbanks, 64.82°N, 147.87°W). It is found that strong PWs exist in two regions. One is around tropopause, and the other is in the polar night jet (PNJ) in winter. The PW activities are rather intermittent, and their lifetimes are no longer than two months. Among three perturbation components in zonal and meridional winds and temperature, the temperature disturbance amplitude is the smallest, and the amplitude for the meridional wind component the largest. Around the tropopause, quasi 5-, 10-, and 16-day PW activities can be observed simultaneously. Among these PW components, the quasi 5-day and 10-day PW are the weakest and strongest, respectively. Moreover, PWs around the tropopause are complex and no obvious season variability can be observed. However, in the PNJ, the higher region, only obvious quasi 10-day and 16-day PWs remain, with smaller amplitudes than those around the tropopause. And significant PWs in the PNJ occur only in winter. By calculating the refractive index for PWs, it is found that there is a persistent reflection layer around 11 km, which is thick in summer and becomes thin or even disappears in winter, revealing that PWs in the stratosphere can only occur in winter. PWs in the 2003/2004 winter at the three stations are analyzed in detail. It is found that for the focused observation duration, the quasi 10-day and quasi 16-day waves exist mainly in the troposphere and stratosphere, respectively. The quasi 10-day wave is a standing wave in the vertical direction, with vertical wavelength about 12 km in the temperature component and larger than 26 km in the meridional component. Moreover, the tropospheric quasi 10-day wave propagates westward with the zonal numbers between 2 and 4. The quasi 16-day wave is also a standing wave in the vertical direction with vertical wavelength larger than 20 km, and seems to be a stationary wave in the horizontal direction. planetary waves, troposphere and lower stratosphere, radiosonde Citation: Wang R, Zhang S D, Yi F. Radiosonde observations of high-latitude planetary waves in the lower atmosphere. Sci China Earth Sci, 2010, 53: 919-932,

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Large-scale thermodynamics of the stratosphere and mesosphere during the major stratospheric warming in 2003/2004

Cited by 29 publications

References 37 publications

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

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

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

Radiosonde observations of high-latitude planetary waves in the lower atmosphere

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