Stratosphere-troposphere exchange ozone flux related to deep convection

Tang, Qi; Prather, Michael J.; Hsu, Juno

doi:10.1029/2010gl046039

Cited by 73 publications

(75 citation statements)

References 40 publications

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“…Previous studies reported the same seasonal ozone pattern, but attributed the summertime peak to differ- ent causes, e.g. more frequent STE events (Ding and Wang, 2006;Tang et al, 2011), enhanced vertical convection (Ma et al, 2005), long-range transport from eastern-central China, central-southern Asia or even Europe during summer (Zhu et al, 2004) and stronger cross boundary transport and vertical convection during the East Asian summer monsoon season . From Fig.…”

Section: Season-annual Variation Characteristics Of Ozonementioning

confidence: 87%

“…) and at Jungfraujoch, Switzerland (0.32 ± 0.18 ppbv year −1 , Cui et al, 2011). Tarasova et al (2009) found evidence for increased stratospheric contribution to surface ozone at Jungfraujoch. The strongest increase at Jungfraujoch was detected in winter and the weakest in summer.…”

Section: Long-term Trends Of Ozonementioning

confidence: 99%

“…Negative trends were revealed at Kislovodsk, Russia (−0.37 ± 0.14 ppbv year −1 , Tarasova et al, 2009) and the Whiteface Mountain Summit site, USA (−0.22 ± 0.06 ppbv year −1 , Oltmans et al, 2013). Tarasova et al (2009) attributed the strong decrease in ozone at Kislovodsk to control measures of Europe and the breakdown of the former USSR. Both the strong increasing and decreasing trends at Jungfraujoch and Kislovodsk were mostly caused by the variation in ozone mixing ratios in the 1990s.…”

Section: Long-term Trends Of Ozonementioning

confidence: 99%

“…The most common method used in the detection of ozone trends is the linear least squares method (Tarasova et al, 2009;Cui et al, 2011;Wang et al, 2009;Xu et al, 2008). Other studies directly compared mean ozone levels of different periods to detect possible trends (Ding et al, 2008;Lin et al, 2014).…”

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confidence: 99%

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Long-term trends of surface ozone and its influencing factors at the Mt Waliguan GAW station, China – Part 1: Overall trends and characteristics

Lin

et al. 2016

Atmos. Chem. Phys.

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Abstract. Tropospheric ozone is an important atmospheric oxidant, greenhouse gas and atmospheric pollutant at the same time. The oxidation capacity of the atmosphere, climate, human and vegetation health can be impacted by the increase of the ozone level. Therefore, long-term determination of trends of baseline ozone is highly needed information for environmental and climate change assessment. So far, studies on the long-term trends of ozone at representative sites are mainly available for European and North American sites. Similar studies are lacking for China and many other developing countries. Measurements of surface ozone were carried out at a baseline Global Atmospheric Watch (GAW) station in the north-eastern Tibetan Plateau region (Mt Waliguan, 36 • 17 N, 100 • 54 E, 3816 m a.s.l.) for the period of 1994 to 2013. To uncover the variation characteristics, long-term trends and influencing factors of surface ozone at this remote site in western China, a two-part study has been carried out, with this part focusing on the overall characteristics of diurnal, seasonal and long-term variations and the trends of surface ozone. To obtain reliable ozone trends, we performed the Mann-Kendall trend test and the Hilbert-Huang transform (HHT) analysis on the ozone data. Our results confirm that the mountain-valley breeze plays an important role in the diurnal cycle of surface ozone at Waliguan, resulting in higher ozone values during the night and lower ones during the day, as was previously reported. Systematic diurnal and seasonal variations were found in mountain-valley breezes at the site, which were used in defining season-dependent daytime and nighttime periods for trend calculations. Significant positive trends in surface ozone were detected for both daytime (0.24 ± 0.16 ppbv year −1 ) and nighttime (0.28 ± 0.17 ppbv year −1 ). The largest nighttime increasing rate occurred in autumn (0.29 ± 0.11 ppbv year −1 ), followed by spring (0.24 ± 0.12 ppbv year −1 ), summer (0.22 ± 0.20 ppbv year −1 ) and winter (0.13 ± 0.10 ppbv year −1 ), respectively. The HHT spectral analysis identified four different stages with different positive trends, with the largest increase occurring around May 2000 and October 2010. The HHT results suggest that there were 2-4a, 7a and 11a periodicities in the time series of surface ozone at Waliguan. The results of this study can be used for assessments of climate and environment change and in the validation of chemistry-climate models.

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Section: Season-annual Variation Characteristics Of Ozonementioning

confidence: 87%

Section: Long-term Trends Of Ozonementioning

confidence: 99%

Section: Long-term Trends Of Ozonementioning

confidence: 99%

mentioning

confidence: 99%

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Long-term trends of surface ozone and its influencing factors at the Mt Waliguan GAW station, China – Part 1: Overall trends and characteristics

Lin

et al. 2016

Atmos. Chem. Phys.

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“…Transport of stratospheric O 3 to the troposphere is at a maximum in spring [Tang et al, 2011], while photochemical O 3 production maximizes in summer. Hence, the observed shift of the O 3 maximum concentration to earlier in the year may imply that the relative contribution from the stratosphere is increasing.…”

Section: Discussionmentioning

confidence: 99%

Lower tropospheric ozone at northern midlatitudes: Changing seasonal cycle

Parrish

Law

Staehelin³

et al. 2013

Geophysical Research Letters

112

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[1] At northern midlatitudes the abundance of tropospheric O 3 has increased by a factor of approximately 2 since the 1950s. The cause of this increase is generally attributed to increasing anthropogenic precursor emissions, but present chemical and transport models cannot quantitatively reproduce its magnitude. Here we show another manifestation of changes in O 3 abundance-a shift of the seasonal cycle at northern midlatitudes so that the observed peak concentrations now appear earlier in the year than in previous decades. The rate of this shift has been 3 to 6 days per decade since the 1970s. We examine possible reasons to explain this shift and suggest it is due to changes in atmospheric transport patterns combined with spatial and temporal changes in emissions. Detailed modeling is necessary to test these hypotheses; this investigation will provide useful guidance for improving global chemistry-climate models and stringent tests of the model results. Citation:

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Tropospheric ozone decrease due to the Mount Pinatubo eruption: Reduced stratospheric influx

Tang

Hess

Brown-Steiner

et al. 2013

Geophysical Research Letters

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We quantify the relationship between Mount Pinatubo eruption in June 1991 and tropospheric ozone abundances. The ozone reduction in the stratosphere and troposphere following the eruption is simulated by the Whole Atmosphere Community Climate Model and is in good agreement with the ozonesonde observations. Simulated anomalies in the global stratosphere‐troposphere flux of ozone following the eruption are well correlated with those in the tropospheric ozone column. Both are at their minimum in late 1992 to early 1993 (−70 Tgyr−1 in January 1993 for the flux and −1.9 Dobson Unit in November 1992 for tropospheric ozone) and recover after 1995. Therefore, this study identifies the reduced stratosphere‐to‐troposphere ozone flux as an important driver of the ozone decline in the troposphere following the eruption. A large fraction (67%) of the decrease in the flux is compensated by an increase in tropospheric photochemical ozone production. While both the strength of the residual circulation and the decrease in stratospheric ozone reduce the stratospheric ozone flux, the ozone reduction is identified as the dominant cause.

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Stratosphere-troposphere exchange ozone flux related to deep convection

Cited by 73 publications

References 40 publications

Long-term trends of surface ozone and its influencing factors at the Mt Waliguan GAW station, China – Part 1: Overall trends and characteristics

Long-term trends of surface ozone and its influencing factors at the Mt Waliguan GAW station, China – Part 1: Overall trends and characteristics

Lower tropospheric ozone at northern midlatitudes: Changing seasonal cycle

Tropospheric ozone decrease due to the Mount Pinatubo eruption: Reduced stratospheric influx

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