Kelvin wave signatures in ECMWF meteo fields and Global Ozone Monitoring Experiment (GOME) ozone columns

Timmermans, R. M. A.

doi:10.1029/2004jd005261

Cited by 5 publications

(13 citation statements)

References 28 publications

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“…In ECMWF data planetary waves are quite realistic in the lower stratosphere (Timmermans et al, 2005;Feng et al, 2007;Ern et al, 2008;Yang et al, 2011). Although the quality of the planetary waves in ECMWF somewhat decreases toward higher altitudes (Ern et al, 2008, it can be assumed that the main features of planetary wave driving are captured by ERA-Interim at stratopause heights.…”

Section: Ern Et Al: Gravity Wave Driving Of the Saomentioning

confidence: 99%

Driving of the SAO by gravity waves as observed from satellite

Ern¹,

Preusse²,

Riese³

2015

Ann. Geophys.

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Abstract. It is known that atmospheric dynamics in the tropical stratosphere have an influence on higher altitudes and latitudes as well as on surface weather and climate. In the tropics, the dynamics are governed by an interplay of the quasi-biennial oscillation (QBO) and semiannual oscillation (SAO) of the zonal wind. The QBO is dominant in the lower and middle stratosphere, and the SAO in the upper stratosphere/lower mesosphere. For both QBO and SAO the driving by atmospheric waves plays an important role. In particular, the role of gravity waves is still not well understood.In our study we use observations of the High Resolution Dynamics Limb Sounder (HIRDLS) satellite instrument to derive gravity wave momentum fluxes and gravity wave drag in order to investigate the interaction of gravity waves with the SAO. These observations are compared with the ERA-Interim reanalysis. Usually, QBO westward winds are much stronger than QBO eastward winds. Therefore, mainly gravity waves with westward-directed phase speeds are filtered out through critical-level filtering already below the stratopause region. Accordingly, HIRDLS observations show that gravity waves contribute to the SAO momentum budget mainly during eastward wind shear, and not much during westward wind shear. These findings confirm theoretical expectations and are qualitatively in good agreement with ERA-Interim and other modeling studies. In ERAInterim most of the westward SAO driving is due to planetary waves, likely of extratropical origin. Still, we find in both observations and ERA-Interim that sometimes westwardpropagating gravity waves may contribute to the westward driving of the SAO. Four characteristic cases of atmospheric background conditions are identified. The forcings of the SAO in these cases are discussed in detail, supported by gravity wave spectra observed by HIRDLS. In particular, we find that the gravity wave forcing of the SAO cannot be explained by critical-level filtering alone; gravity wave saturation without critical levels being reached is also important.

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Section: Ern Et Al: Gravity Wave Driving Of the Saomentioning

confidence: 99%

Driving of the SAO by gravity waves as observed from satellite

Ern¹,

Preusse²,

Riese³

2015

Ann. Geophys.

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“…Investigations of the effects of the Kelvin waves on the stratospheric ozone revealed their influence on the fluctuations of the ozone concentrations and temperature (Timmermans et al, 2004(Timmermans et al, , 2005. Forbes (2000) predicted in his dynamical model that the effects of the UFKW on the composition and temperature should affect the airglow emissions coming from 90 and 110 km altitudes.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Kelvin waves in the MLT airglow and wind, and their interaction with the atmospheric tides

et al. 2018

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Abstract. Airglow and wind measurements from the Brazilian equatorial region were used to investigate the presence and the effects of the 3-4-day ultrafast Kelvin waves in the MLT. The airglow integrated intensities of the OI557.7 nm, O 2 b(0-1) and OH(6-2) emissions, as well as the OH rotational temperature, were measured by a multichannel photometer, and the zonal and meridional wind components between 80 and 100 km were obtained from a meteor radar. Both instruments are installed in the Brazilian equatorial region at São João do Cariri (7.4 • S, 36.5 • W). Data from 2005 were used in this study. The 3-4-day oscillations appear intermittently throughout the year in the airglow. They were identified in January, March, July, August and October-November observations. The amplitudes induced by the waves in the airglow range from 26 to 40 % in the OI557.7 nm, 17 to 43 % in the O 2 b(0-1) and 15 to 20 % in the OH(6-2) emissions. In the OH rotational temperature, the amplitudes were from 4 to 6 K. Common 3-4-day oscillations between airglow and neutral wind compatible with ultrafast Kelvin waves were observed in March, August and October-November. In these cases, the amplitudes in the zonal wind were found to be between 22 and 28 m s −1 and the vertical wavelength ranges from 44 to 62 km. Evidence of the nonlinear interaction between the ultrafast Kelvin wave and diurnal tide was observed.

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“…23 August 1996 is chosen because maximum ozone perturbations within period P1 are found on this day. Note that it is also the day where maximum zonal wind perturbations in the ERA‐40 data were found in T05. From this figure of filtered data, the tilt of the perturbations with height can be determined.…”

Section: Resultsmentioning

confidence: 99%

“…For the detection of Kelvin wave signals in the ozone profiles, the same bidimensional spectral analysis method as applied in T04 and T05 has been used. The method has the advantages to be able to handle unequally spaced data and to allow easy determination of the significance of detected signals.…”

Section: Data and Analysismentioning

confidence: 99%

“…However, the assimilated data set forms an optimal combination between the ozone profile measurements and the information from the ERA‐40 data to provide the best representation of the ozone distribution. This representation can be used to study the vertical distribution of the ozone fluctuations induced by the Kelvin waves previously identified in T04 and T05. The three data sets all have different characteristics concerning for instance accuracy and vertical resolution and will therefore give different results.…”

Section: Introductionmentioning

confidence: 99%

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Equatorial Kelvin wave signatures in ozone profile measurements from Global Ozone Monitoring Experiment (GOME)

2005

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[1] This study investigates the ability to derive height-resolved information on equatorial Kelvin wave activity from three different Global Ozone Monitoring Experiment (GOME) ozone profile data sets. The ozone profiles derived using the Ozone Profile Retrieval Algorithm (OPERA) based on optimal estimation and the Neural Network Ozone Retrieval System (NNORSY) both show Kelvin wave signals in agreement with previously identified signals in the GOME total ozone columns. However, because of the inadequate vertical resolution, these two data sets are not able to resolve the vertical structure of the Kelvin wave activity. The third data set, consisting of assimilated OPERA ozone profiles, does provide height-resolved information on Kelvin wave activity that is consistent with results from the analysis of GOME total ozone columns and ECMWF Re-Analysis (ERA-40) temperature data. Largest Kelvin-wave-induced perturbations of up to 0.69 DU/km coincide with the maximum vertical gradient in ozone around 35 hPa and show an in-phase relationship with temperature perturbations in ERA-40 as expected from theoretical considerations. These results indicate that the ozone perturbations in the lower stratosphere and in the total column of ozone are transport related. Between 10 and 1 hPa, large Kelvin-wave-induced fluctuations in ozone mixing ratio are present that, however, because of their small contribution to the total column, do not constitute a large contribution to the total ozone column perturbations. The ozone perturbations between 10 and 1 hPa show an out-of-phase relationship with temperature perturbations in ERA-40, indicating that the perturbations can either be caused by transport effects or photochemical influences.

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Kelvin wave signatures in ECMWF meteo fields and Global Ozone Monitoring Experiment (GOME) ozone columns

Cited by 5 publications

References 28 publications

Driving of the SAO by gravity waves as observed from satellite

Driving of the SAO by gravity waves as observed from satellite

Ultrafast Kelvin waves in the MLT airglow and wind, and their interaction with the atmospheric tides

Equatorial Kelvin wave signatures in ozone profile measurements from Global Ozone Monitoring Experiment (GOME)

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