Seasonal and Diurnal Ozone Variations: Observations and Modeling

Schneider, N.; Selsis, Franck; Urban, Joachim; Lezeaux, Olivier; Noë, J. de La; Ricaud, Philippe

doi:10.1007/s10874-005-1172-z

Cited by 30 publications

(32 citation statements)

References 53 publications

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“…Similar high VMR values were already noted in the initial validation for version 1.0 of the ACE-FTS data product (e.g., Walker et al, 2005;McHugh et al, 2005). The natural diurnal cycle of ozone in the mesosphere may be a factor in explaining the discrepancies, since the nighttime VMR values can be as much as 30 to 60% higher than the daytime values in the range 48-60 km (Schneider et al, 2005). However, these large differences are observed for comparisons with different instruments operating from different platforms, in different spectral ranges and with different viewing geometries.…”

Section: Summary -Discussionsupporting

confidence: 78%

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Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Dupuy¹,

Walker²,

Kar³

et al. 2009

Atmos. Chem. Phys.

145

126

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Abstract. This paper presents extensive bias determination analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from nearly 20 satellite-borne, airborne, balloonborne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACE-FTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the average values of the mean relative differences are nearly all within +1 to +8%. At higher altitudes (45-60 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments, with mean relative differences of up to +40% (about +20% on average). For the ACE-MAESTRO version 1.2 ozone data product, mean relative differences are within ±10% (average values within ±6%) between 18 and 40 km for both the sunrise and sunset measurements. At higher altitudes (∼35-55 km), systematic biases of opposite sign are found between the ACE-MAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (with mean relative differences down to −10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS, indicating a large positive bias (mean relative differences within +10 to +30%) in the 45-55 km altitude range. In contrast, there is no significant systematic difference in bias found for the ACE-FTS sunrise and sunset measurements.

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Section: Summary -Discussionsupporting

confidence: 78%

“…Day/night differences in ozone VMR can have an impact on the comparison results in the mesosphere (e.g., Schneider et al, 2005). For the comparisons presented hereafter, we did not routinely use any photochemical model for the ACE measurements to account for these diurnal variations.…”

Section: Temporal and Spatial Criteria For Coincidencesmentioning

confidence: 99%

Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Dupuy¹,

Walker²,

Kar³

et al. 2009

Atmos. Chem. Phys.

145

126

View full text Add to dashboard Cite

show abstract

“…The diurnal variation of mesospheric ozone from models and observations agreed within 10 %. Schneider et al (2005) obtained a decrease of −35 % for lower mesospheric ozone at 55 km altitude during daytime.…”

Section: Gromosmentioning

confidence: 90%

A climatology of the diurnal variations in stratospheric and mesospheric ozone over Bern, Switzerland

et al. 2014

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Abstract. The ground-based radiometer GROMOS, stationed in Bern (47.95 • N, 7.44 • E), Switzerland, has a unique data set: it obtains ozone profiles from November 1994 to present with a time resolution of 30 min and equivalent quality during night-and daytime. Here, we derive a monthly climatology of the daily ozone cycle from 17 years of GRO-MOS observation. We present the diurnal ozone variation of the stratosphere and mesosphere. Characterizing the diurnal cycle of stratospheric ozone is important for correct trend estimates of the ozone layer derived from satellite observations. The diurnal ozone cycle from GROMOS is compared to two models: the Whole Atmosphere Community Climate Model (WACCM) and the Hamburg Model of Neutral and Ionized Atmosphere (HAMMONIA). Generally, observation and models show a good agreement: in the lower mesosphere, daytime ozone is for both GROMOS and models around 25 % less than midnight ozone. In the stratosphere, ozone reaches its maximum in the afternoon showing values several percent larger than the midnight value. Further, GROMOS and models indicate a seasonal behaviour of the diurnal ozone variations in the stratosphere with a larger afternoon maximum during daytime in summer than in winter. Using the 17 years of ozone profiles from GROMOS, we find strong interannual variations in the diurnal ozone cycle for both the stratosphere and the mesosphere. Interannual variability in temperature, atmospheric circulation and composition may explain the observed interannual variability of the diurnal ozone cycle above Bern.

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“…The seasonal variations, given in terms of annual and semi-annual oscillations (AO, SAO), have been studied for many years (e.g. Ern et al, 2015;Schneider et al, 2005;Cordero and Kawa, 2001;Garcia et al, 1997;Ray et al, 1994;Perliski et al, 1989;Delisi and Dunkerton, 1988;Maeda, 1984). On interannual timescales dynamical feedbacks in the Earth system lead to effects of originally tropical phenomena, such as quasi-biennial oscillation (QBO) and El Niño-Southern Oscillation (ENSO), on midlatitude wave structures and wave propagation.…”

Section: Introductionmentioning

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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Seasonal and Diurnal Ozone Variations: Observations and Modeling

Cited by 30 publications

References 53 publications

Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

A climatology of the diurnal variations in stratospheric and mesospheric ozone over Bern, Switzerland

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

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