Lidar observations of gravity wave activity and Arctic stratospheric vortex core warming

Duck, Thomas J.; Whiteway, J.; Carswell, A. I.

doi:10.1029/98gl02113

Cited by 65 publications

(60 citation statements)

References 24 publications

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“…Consequently, the lower GWPED over Esrange during January and February compared to the rest of the winter is most likely to be the result of the influence of stratospheric warmings. Note, that Whiteway and Carswell (1994) also reported a lower GWPED in the presence of stratospheric warmings, but Duck et al (1998) noted that Whiteway and Carswell (1994) wrongly associated a movement of the polar vortex with a stratospheric warming.…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, the first Gaussian mode in the GWPED occurrence frequency can be interpreted as representative of gravity waves excited by ubiquitous sources such as convection, shears, geostrophic adjustment, or wave-wave interactions. The second Gaussian mode found at Esrange could then be associated with strong mountain wave forcing or associated with stronger winds at the edge of the polar vortex (Duck et al, 1998). Since the distribution of GWPED is similar during all winter months (not shown) it is more likely that the shape of the distribution is controlled by mountain waves and not by the presence of the polar vortex.…”

Section: From 90mentioning

confidence: 99%

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Long-term lidar observations of wintertime gravity wave activity over northern Sweden

2014

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Abstract. This paper presents an analysis of gravity wave activity over northern Sweden as deduced from 18 years of wintertime lidar measurements at Esrange (68 • N, 21 • E). Gravity wave potential energy density (GWPED) was used to characterize the strength of gravity waves in the altitude regions 30-40 km and 40-50 km. The obtained values exceed previous observations reported in the literature. This is suggested to be due to Esrange's location downwind of the Scandinavian mountain range and due to differences in the various methods that are currently used to retrieve gravity wave parameters. The analysis method restricted the identification of the dominating vertical wavelengths to a range from 2 to 13 km. No preference was found for any wavelength in this window. Monthly mean values of GW-PED show that most of the gravity waves' energy dissipates well below the stratopause and that higher altitude regions show only small dissipation rates of GWPED. Our analysis does not reproduce the previously reported negative trend in gravity wave activity over Esrange. The observed interannual variability of GWPED is connected to the occurrence of stratospheric warmings with generally lower wintertime mean GWPED during years with major stratospheric warmings. A bimodal GWPED occurrence frequency indicates that gravity wave activity at Esrange is affected by both ubiquitous wave sources and orographic forcing.

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Section: Discussionmentioning

confidence: 99%

Section: From 90mentioning

confidence: 99%

Long-term lidar observations of wintertime gravity wave activity over northern Sweden

2014

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“…Much work about gravity waves during SSWs has been done using ground-based observations, for example lidar data (e.g., Duck et al, 1998) and radar data (e.g., Hoffmann et al, 2002Hoffmann et al, , 2007. One of the main findings is that during SSWs gravity wave activity in the upper stratosphere and in the mesosphere is related to the background winds, and selective filtering of gravity waves by the background winds is an important effect (e.g., Thurairajah et al, 2010;Matthias et al, 2012).…”

Section: Gravity Wave Observations During Sswsmentioning

confidence: 99%

Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings

Ern¹,

Trinh²,

Kaufmann³

et al. 2016

Atmos. Chem. Phys.

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Abstract. Sudden stratospheric warmings (SSWs) are circulation anomalies in the polar region during winter. They mostly occur in the Northern Hemisphere and affect also surface weather and climate. Both planetary waves and gravity waves contribute to the onset and evolution of SSWs. While the role of planetary waves for SSW evolution has been recognized, the effect of gravity waves is still not fully understood, and has not been comprehensively analyzed based on global observations. In particular, information on the gravity wave driving of the background winds during SSWs is still missing.

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“…The intense cyclonic vortices that form over the winter pole are one of the most prominent features of the stratospheric circulation [7][8][9]. The structures and dynamics of the "polar vortex" play a dominant role in the stratospheric circulations and couplings between the stratosphere and troposphere during winter and spring.…”

Section: Introductionmentioning

confidence: 99%

The Relationship between Polar Vortex and Ozone Depletion in the Antarctic Stratosphere during the Period 1979–2016

Zhou

2017

Advances in Meteorology

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As the most prominent feature of the polar stratosphere, polar vortex results in widespread changes in the climate system, especially in the ozone variation. In this study, the linkage between polar vortex and ozone depletion in Antarctic stratosphere during the period 1979-2016 is investigated; we calculated the averaged total column ozone within the polar vortex based on the vortex edge (−28.8 PVU PV contour) instead of the geographical region defined by latitude and longitude. Results from the spatial patterns of ozone and polar vortex suggest that the morphological changes of polar vortex can impact the horizontal distribution of ozone and the ozone within the polar vortex experiences a severe depletion in spring. The negative relationship between ozone and polar vortex in terms of vortex area, strength, and breakup time is significant with the correlation coefficients of −0.57, −0.68, and −0.76, respectively. The breakup time of polar vortex plays an important role in the relation between polar vortex and ozone depletion with the highest-value correlation coefficient among three polar vortex parameters. Furthermore, the possible mechanism for this relationship is also discussed in this article.

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Lidar observations of gravity wave activity and Arctic stratospheric vortex core warming

Cited by 65 publications

References 24 publications

Long-term lidar observations of wintertime gravity wave activity over northern Sweden

Long-term lidar observations of wintertime gravity wave activity over northern Sweden

Satellite observations of middle atmosphere gravity wave absolute momentum flux and of its vertical gradient during recent stratospheric warmings

The Relationship between Polar Vortex and Ozone Depletion in the Antarctic Stratosphere during the Period 1979–2016

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