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

Timmermans, R. M. A.; Oss, van Rf; Kelder, H.

doi:10.1029/2003jd003946

Cited by 5 publications

(25 citation statements)

References 36 publications

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“…The maximum signal is found between about 10–50 hPa at wave periods of 15–20 days. This result agrees with the signal found in the GOME total ozone columns in T04. The right panel of Figure 1, which shows the periodogram of the integrated ozone profile as function of zonal wave number and wave period, agrees with the periodogram derived for the total ozone data (Figure 1, T04).…”

Section: Resultssupporting

confidence: 88%

“…This result agrees with the signal found in the GOME total ozone columns in T04. The right panel of Figure 1, which shows the periodogram of the integrated ozone profile as function of zonal wave number and wave period, agrees with the periodogram derived for the total ozone data (Figure 1, T04). The blue, green and red area respectively denote the 90%, 99% and 99,9% significant signals as explained in T04.…”

Section: Resultssupporting

confidence: 88%

“…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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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 88%

Section: Data and Analysismentioning

confidence: 99%

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

Timmermans¹

2005

J. Geophys. Res.

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[1] This study investigates the vertical structure of the Kelvin wave signals previously found in total ozone column measurements from the Global Ozone Monitoring Experiment (GOME) instrument. For this, zonal wind and temperature measurements from the European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis data set are analyzed by using the same bidimensional spectral method as was used to analyze the GOME total ozone columns. These fields are available on 60 levels from the surface to 0.1 hPa. For the three high Kelvin wave activity periods identified in the GOME data we found spectral features in the ECMWF fields associated with Kelvin waves with zonal wave numbers 1 or 2 and periods around 15-20 days. These characteristics correspond to the characteristics of the Kelvin waves detected in GOME. The signals are significant throughout the lower stratosphere between $100 and 10 hPa and, depending on the period, are largest around 15, 45, or 65 hPa. There is a good correlation between the Kelvin wave signals in the ECMWF zonal wind and temperature and the GOME total ozone column. The induced fluctuations in zonal wind and temperature are, respectively, up to 8 m/s and 2 K. From these induced zonal wind fluctuations, expected total ozone column fluctuations of around 1 DU are calculated, corresponding to the ozone fluctuations found in the GOME data. The results indicate that the analyzed total ozone column fluctuations are mainly caused by transport effects in the lower stratosphere. This study shows that combined use of ECMWF Re-Analysis data and GOME ozone columns provides a possibility to study the three-dimensional structure of Kelvin wave activity.

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

Cited by 5 publications

References 36 publications

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

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

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

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

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