scholarly journals Are EEP Events Important for the Tertiary Ozone Maximum?

2019 ◽  
Vol 124 (7) ◽  
pp. 5976-5994 ◽  
Author(s):  
Annet Eva Zawedde ◽  
Hilde Nesse Tyssøy ◽  
Johan Stadsnes ◽  
Marit Irene Sandanger
Keyword(s):  
Ozone Maximum

scholarly journals Comparison of ozone profiles and influences from the tertiary ozone maximum in the night-to-day ratio above Switzerland

2017 ◽  
Vol 17 (17) ◽  
pp. 10259-10268 ◽  
Author(s):  
Lorena Moreira ◽  
Klemens Hocke ◽  
Niklaus Kämpfer
Keyword(s):  
Annual Variation ◽  
Lower Stratosphere ◽  
Microwave Radiometer ◽  
Relative Difference ◽  
Atmospheric Composition ◽  
Composition Change ◽  
Ozone Maximum ◽  
Ozone Profile ◽  
Mesospheric Ozone ◽  
The Mean

Abstract. Stratospheric and middle-mesospheric ozone profiles above Bern, Switzerland (46.95° N, 7.44° E; 577 m) have been continually measured by the GROMOS (GROund-based Millimeter-wave Ozone Spectrometer) microwave radiometer since 1994. GROMOS is part of the Network for the Detection of Atmospheric Composition Change (NDACC). A new version of the ozone profile retrievals has been developed with the aim of improving the altitude range of retrieval profiles. GROMOS profiles from this new retrieval version have been compared to coincident ozone profiles obtained by the satellite limb sounder Aura Microwave Limb Sounder (MLS). The study covers the stratosphere and middle mesosphere from 50 to 0.05 hPa (from 21 to 70 km) and extends over the period from July 2009 to November 2016, which results in more than 2800 coincident profiles available for the comparison. On average, GROMOS and MLS comparisons show agreement generally over 20 % in the lower stratosphere and within 2 % in the middle and upper stratosphere for both daytime and nighttime, whereas in the mesosphere the mean relative difference is below 40 % during the daytime and below 15 % during the nighttime. In addition, we have observed the annual variation in nighttime ozone in the middle mesosphere, at 0.05 hPa (70 km), characterized by the enhancement of ozone during wintertime for both ground-based and space-based measurements. This behaviour is related to the middle-mesospheric maximum in ozone (MMM).

Subproject TOR-2 Origins and Observations of the Spring Ozone Maximum. Theory and Experiment

2001 ◽  
pp. 100-107
Author(s):  
P. S. Monks ◽  
E. Schuepbach ◽  
P. Zanis ◽  
S. A. Penkett ◽  
T. J. Green ◽  
...  
Keyword(s):  
Ozone Maximum ◽  
Theory And Experiment

scholarly journals An evaluation of chemistry's role in the winter-spring ozone maximum found in the northern midlatitude free troposphere

1999 ◽  
Vol 104 (D3) ◽  
pp. 3655-3667 ◽  
Author(s):  
J. J. Yienger ◽  
A. A. Klonecki ◽  
H. Levy ◽  
W. J. Moxim ◽  
G. R. Carmichael
Keyword(s):  
Free Troposphere ◽  
Ozone Maximum

scholarly journals Destruction of the tertiary ozone maximum during a solar proton event

2006 ◽  
Vol 33 (7) ◽  
Author(s):  
A. Seppälä ◽  
P. T. Verronen ◽  
V. F. Sofieva ◽  
J. Tamminen ◽  
E. Kyrölä ◽  
...  
Keyword(s):  
Solar Proton ◽  
Solar Proton Event ◽  
Proton Event ◽  
Ozone Maximum

Solar cycle modulation of nighttime ozone near the mesopause as observed by MLS

2020 ◽  
Author(s):  
Jae N. Lee ◽  
Dong L. Wu
Keyword(s):  
Carbon Monoxide ◽  
Solar Cycle ◽  
Solar Radiation ◽  
Lower Thermosphere ◽  
Boreal Winter ◽  
High Latitudes ◽  
Ozone Maximum ◽  
Solar Cycle 24 ◽  
Cycle 24 ◽  
Single Oxygen

<p>Solar 11-year cycle variations of nighttime ozone near the secondary ozone maximum layer are analyzed with Aura Microwave Limb Sounder (MLS) observations since 2004 that covers complete solar cycle 24. Produced primarily from the recombination of molecular oxygen (O<sub>2</sub>) with single oxygen (O) transported from the lower thermosphere, the mesospheric nighttime ozone concentration is proportional to single oxygen density [O], of which the latter is modulated by UV solar cycle variations. MLS nighttime ozone and Solar Radiation and Climate Experiment (SORCE) Solar-Stellar Irradiance Comparison Experiment (SOLSTICE) measured UV show a positive correlation in-phase with the solar cycle. The nighttime ozone correlates strongly with temperature but not monotonously positive nor negative. The slope and sign of the correlation depend on location and season. They are positively correlated in general except for the boreal winter high latitudes.  Because the nighttime [O<sub>3</sub>] depends strongly on [O] in the upper mesosphere, it is expected the nighttime [O<sub>3</sub>] would follow the [O] distributions, producing similar diurnal, seasonal, and solar-cycle variations, as well as latitudinal distributions as observed in Carbon Monoxide (CO) in the upper mesosphere.</p>

The meteorological environment of the tropospheric ozone maximum over the tropical South Atlantic Ocean

1993 ◽  
Vol 98 (D6) ◽  
pp. 10621 ◽  
Author(s):  
T. N. Krishnamurti ◽  
H. E. Fuelberg ◽  
M. C. Sinha ◽  
D. Oosterhof ◽  
E. L. Bensman ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Tropospheric Ozone ◽  
South Atlantic ◽  
South Atlantic Ocean ◽  
Ozone Maximum

scholarly journals IASI observations of seasonal and day-to-day variations of tropospheric ozone over three highly populated areas of China: Beijing, Shanghai, and Hong Kong

2010 ◽  
Vol 10 (8) ◽  
pp. 3787-3801 ◽  
Author(s):  
G. Dufour ◽  
M. Eremenko ◽  
J. Orphal ◽  
J.-M. Flaud
Keyword(s):  
Hong Kong ◽  
Tropospheric Ozone ◽  
Asian Summer Monsoon ◽  
Regional Scale ◽  
Early Summer ◽  
Air Masses ◽  
Ozone Maximum ◽  
The Pacific ◽  
Summer Minimum ◽  
One Year

Abstract. IASI observations of tropospheric ozone over the Beijing, Shanghai and Hong Kong areas during one year (2008) have been analysed, demonstrating the capability of space-borne infrared nadir measurements to probe seasonal and even day-to-day variations of lower tropospheric ozone (0–6 km partial columns) on the regional scale of highly populated areas. The monthly variations of lower tropospheric ozone retrieved from IASI clearly show the influence of the Asian summer monsoon that brings clean air masses from the Pacific during summer. They exhibit indeed a sharp ozone maximum in late spring and early summer (May–June) followed by a summer minimum. The time periods and the intensities of the maxima and of the decreases are latitude-dependent: they are more pronounced in Hong Kong and Shanghai than in Beijing. Moreover, IASI provides the opportunity to follow the spatial variations of ozone over the surroundings of each megacity as well as its daily variability. We show here that the large lower tropospheric ozone amounts (0–6 km partial columns) observed with IASI are mainly downwind the highest populated areas in each region, thus possibly suggesting the anthropogenic origin of the large ozone amounts observed. Finally, an analysis of the mean ozone profiles over each region – for selected days with high ozone events – in association with the analysis of the meteorological situation shows that the high ozone amounts observed during winter are likely related to descents of ozone-rich air from the stratosphere, whereas in spring and summer the tropospheric ozone is likely enhanced by photochemical production in polluted areas and/or in air masses from fire plumes.

scholarly journals Global ozone–CO correlations from OMI and AIRS: constraints on tropospheric ozone sources

2013 ◽  
Vol 13 (4) ◽  
pp. 8901-8937 ◽  
Author(s):  
P. S. Kim ◽  
D. J. Jacob ◽  
X. Liu ◽  
J. X. Warner ◽  
K. Yang ◽  
...  
Keyword(s):  
Tropospheric Ozone ◽  
Transport Model ◽  
General Structure ◽  
Deep Convection ◽  
Chemical Transport Model ◽  
Ozone Monitoring Instrument ◽  
Data Set ◽  
Tropical Regions ◽  
Ozone Maximum ◽  
Regression Slopes

Abstract. We present a global data set of free tropospheric ozone–CO correlations with 2° × 2.5° spatial resolution from the Ozone Monitoring Instrument (OMI) and Atmospheric Infrared Sounder (AIRS) satellite instruments for each season of 2008. OMI and AIRS have near daily global coverage of ozone and CO respectively and observe coincident scenes with similar vertical sensitivities. The resulting ozone–CO correlations are highly statistically significant (positive or negative) in most regions of the world, and are less noisy than previous satellite-based studies that used sparser data. We interpret the observed ozone–CO correlations with the GEOS-Chem chemical transport model to infer constraints on ozone sources. Driving GEOS-Chem with different meteorological fields generally shows consistent ozone–CO correlation patterns, except in some tropical regions where the correlations are strongly sensitive to model transport error associated with deep convection. GEOS-Chem reproduces the general structure of the observed ozone–CO correlations and regression slopes (dO3/dCO), although there are some large regional discrepancies. We examine the model sensitivity of dO3/dCO to different ozone sources (combustion, biosphere, stratosphere, and lightning NOx) by correlating the ozone change from that source to CO from the standard simulation. The model reproduces the observed positive dO3/dCO in the extratropical Northern Hemisphere in spring–summer, driven by combustion sources. Stratospheric influence there is also associated with a positive dO3/dCO because of the interweaving of stratospheric downwelling with continental outflow. The well-known ozone maximum over the tropical South Atlantic is associated with negative dO3/dCO in the observations; this feature is reproduced in GEOS-Chem and supports a dominant contribution from lightning to the ozone maximum. A~major model discrepancy is found over the Northeast Pacific in summer-fall where dO3/dCO is positive in the observations but negative in the model, for all ozone sources. We suggest that this reflects a model overestimate of lightning at northern mid-latitudes combined with an underestimate of the East Asian CO source.

scholarly journals Spatio-temporal observations of tertiary ozone maximum

2009 ◽  
Vol 9 (2) ◽  
pp. 6597-6615
Author(s):  
V. F. Sofieva ◽  
E. Kyrölä ◽  
P. T. Verronen ◽  
A. Seppälä ◽  
J. Tamminen ◽  
...  
Keyword(s):  
Climate Model ◽  
Solar Proton ◽  
Mixing Ratio ◽  
Polar Night ◽  
Night Time ◽  
Subsequent Decrease ◽  
Ozone Maximum ◽  
Low Concentrations ◽  
Spatio Temporal ◽  
In The Beginning

Abstract. We present spatio-temporal distributions of tertiary ozone maximum (TOM), based on GOMOS (Global Ozone Monitoring by Occultation of Stars) ozone measurements in 2002–2006. The tertiary ozone maximum is typically observed in the high-latitude winter mesosphere at altitude ~72 km. Although the explanation for this phenomenon has been found recently – low concentrations of odd-hydrogen cause the subsequent decrease in odd-oxygen losses – models have had significant deviations from existing observations until recently. Good coverage of polar night regions by GOMOS data has allowed for the first time obtaining spatial and temporal observational distributions of night-time ozone mixing ratio in the mesosphere. The distributions obtained from GOMOS data have specific features, which are variable from year to year. In particular, due to a long lifetime of ozone in polar night conditions, the downward transport of polar air by the meridional circulation is clearly observed in the tertiary ozone maximum time series. Although the maximum tertiary ozone mixing ratio is achieved close to the polar night terminator (as predicted by the theory), TOM can be observed also at very high latitudes, not only in the beginning and at the end, but also in the middle of winter. We have compared the observational spatio-temporal distributions of tertiary ozone maximum with that obtained using WACCM (Whole Atmosphere Community Climate Model) and found that the specific features are reproduced satisfactorily by the model. Since ozone in the mesosphere is very sensitive to HOx concentrations, energetic particle precipitation can significantly modify the shape of the ozone profiles. In particular, GOMOS observations have shown that the tertiary ozone maximum was temporarily destroyed during the January 2005 and December 2006 solar proton events as a result of the HOx enhancement from the increased ionization.

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