A 20-day period standing oscillation in the northern winter stratosphere

Hocke, Klemens; Studer, Simone; Martius, Olivia; Scheiben, Dominik; Kämpfer, Niklaus

doi:10.5194/angeo-31-755-2013

Cited by 16 publications

(23 citation statements)

References 18 publications

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“…Therefore, characterizing the planetary waves along equivalent latitude circles that are related to the center of the polar vortex instead of geographical latitude circles could increase the quality of the analysis. A similar finding was obtained by a study from Hocke et al (2013) for a standing wave of the polar vortex in the northern winter stratosphere. Based on ozone observations and ECMWF reanalysis data, they also found a strong longitudinal variation of the wave amplitude along geographical latitude circles.…”

Section: Longitudinal Variation Of the Quasi 16-day Wavesupporting

confidence: 89%

The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012

et al. 2014

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Abstract. This study investigates the characteristics of the quasi 16-day wave in the mesosphere during boreal winter 2011/2012 using observations of water vapor from groundbased microwave radiometers and satellite data. The groundbased microwave radiometers are located in Seoul (South Korea, 37 • N), Bern (Switzerland, 47 • N) and Sodankylä (Finland, 67 • N). The quasi 16-day wave is observed in the mesosphere at all three locations, while the dominant period increases with latitude from 15 days at Seoul to 20 days at Sodankylä. The observed evolution of the quasi 16-day wave confirms that the wave activity is strongly decreased during a sudden stratospheric warming that occurred in midJanuary 2012. Using satellite data from the Microwave Limb Sounder on the Aura satellite, we examine the zonal characteristics of the quasi 16-day wave and conclude that the observed waves above the midlatitudinal stations Seoul and Bern are eastward-propagating s = −1 planetary waves with periods of 15 to 16 days, while the observed oscillation above the polar station Sodankylä is a standing wave with a period of approximately 20 days. The strongest relative wave amplitudes in water vapor during the investigated time period are approximately 15 %. The wave activity varies strongly along a latitude circle. The activity of the quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012 is strongest over northern Europe, the North Atlantic Ocean and northwestern Canada. The region of highest wave activity seems to be related to the position of the polar vortex. We conclude that the classic approach to characterize planetary waves zonally averaged along a latitude circle is not sufficient to explain the local observations because of the strong longitudinal dependence of the wave activity.

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Section: Longitudinal Variation Of the Quasi 16-day Wavesupporting

confidence: 89%

The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012

et al. 2014

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“…The vertical ozone profiles from GROMOS have been validated by means of nearby ozone sondes, ground-based stations and are in good agreement with satellite observations. Its data set has been used for studies of ozone-climate interaction, middle atmospheric dynamics as well as for long-term monitoring of the stratospheric ozone layer and for the detection of trends (Moreira et al, 2015;WMO, 2014;Studer et al, 2014Studer et al, , 2013Hocke et al, 2013;Studer et al, 2012;van Gijsel et al, 2010;Flury et al, 2009;Steinbrecht et al, 2009Steinbrecht et al, , 2006Dumitru et al, 2006;Calisesi et al, 2001;Peter et al, 1996;Peter and Kämpfer, 1995).…”

Section: Data Sourcesmentioning

confidence: 99%

The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern

et al. 2016

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Abstract. A multilinear parametric regression analysis was performed to assess the seasonal and interannual variations of stratospheric ozone profiles from the GROMOS (GROund-based Millimeter-wave Ozone Spectrometer) microwave radiometer at Bern, Switzerland (46.95 • N, 7.44 • E; 577 m). GROMOS takes part in the Network for the Detection of Atmospheric Composition Change (NDACC). The study covers the stratosphere from 50 to 0.5 hPa (from 21 to 53 km) and extends over the period from January 1997 to January 2015. The natural variability was fitted during the regression analysis through the annual and semi-annual oscillations (AO, SAO), the quasi-biennial oscillation (QBO), the El Niño-Southern Oscillation (ENSO) and the solar activity cycle. Seasonal ozone variations mainly appear as an annual cycle in the middle and upper stratosphere and a semiannual cycle in the upper stratosphere. Regarding the interannual variations, they are primarily present in the lower and middle stratosphere. In the lower and middle stratosphere, ozone variations are controlled predominantly by transport processes, due to the long lifetime of ozone, whereas in the upper stratosphere its lifetime is relatively short and ozone is controlled mainly by photochemistry. The present study shows agreement in the observed naturally induced ozone signatures with other studies. Further, we present an overview of the possible causes of the effects observed in stratospheric ozone due to natural oscillations at a northern midlatitude station. For instance regarding the SAO, we find that polar winter stratopause warmings contribute to the strength of this oscillation since these temperature enhancements lead to a reduction in upper stratospheric ozone. We have detected a strong peak amplitude of about 5 % for the solar cycle in lower stratospheric ozone for our 1.5 cycles of solar activity. Though the 11-year ozone oscillation above Bern is in phase with the solar cycle, we suppose that the strong amplitude is partly due to meteorological disturbances and associated ozone anomalies in the Northern Hemisphere. Further, our observational study gave the result that ozone above Bern is anti-correlated with the ENSO phenomenon in the lower stratosphere and correlated in the middle stratosphere.

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“…We successfully applied this method to other middle atmospheric trace gas studies (e.g. Hocke et al, 2013;Scheiben et al, 2014). The wavelet-like analysis has the advantage of capturing variations with non-persistent phase.…”

Section: Signatures Of the Quasi-2-day Wavementioning

confidence: 99%

Signatures of the 2-day wave and sudden stratospheric warmings in Arctic water vapour observed by ground-based microwave radiometry

Tschanz

Kämpfer

2015

Atmos. Chem. Phys.

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Abstract. The ground-based microwave radiometer MIAWARA-C recorded the upper stratospheric and lower mesospheric water vapour distribution continuously from June 2011 to March 2013 above the Arctic station of Sodankylä, Finland (67.4 • N, 26.6 • E) without major interruptions and offers water vapour profiles with temporal resolution of 1 h for average conditions. The water vapour time series of MIAWARA-C shows strong periodic variations in both summer and winter related to the quasi-2-day wave. Above 0.1 hPa the amplitudes are strongest in summer. The stratospheric wintertime 2-day wave is pronounced for both winters on altitudes below 0.1 hPa and reaches a maximum amplitude of 0.8 ppmv in November 2011. Over the measurement period, the instrument monitored the changes in water vapour linked to two sudden stratospheric warmings in early 2012 and 2013. Based on the water vapour measurements, the descent rate in the vortex after the warmings is 364 m d −1 for 2012 and 315 m d −1 for 2013.

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A 20-day period standing oscillation in the northern winter stratosphere

Cited by 16 publications

References 18 publications

The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012

The quasi 16-day wave in mesospheric water vapor during boreal winter 2011/2012

The natural oscillations in stratospheric ozone observed by the GROMOS microwave radiometer at the NDACC station Bern

Signatures of the 2-day wave and sudden stratospheric warmings in Arctic water vapour observed by ground-based microwave radiometry

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