Response of Ozone to a Gravity Wave Process in the UTLS Region Over the Tibetan Plateau

Chang, Shujie; Sheng, Zheng; Zhu, Yanbo; Shi, Weilai; Luo, Zhixian

doi:10.3389/feart.2020.00289

Cited by 10 publications

(9 citation statements)

References 37 publications

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“…Recent studies show that ozone can be influenced by non-dissipative effects of GWs (e.g. Chang et al, 2020;Gabriel, 2022). However, as these processes are not resolved in the here used model simulation and neither are included in the parameterization, this possible influence cannot be analysed here.…”

Section: Contextualizationmentioning

confidence: 97%

On the impact of Himalaya-induced gravity waves on the polar vortex, Rossby wave activity and ozone

Kuchař

Šácha

Eichinger

et al. 2022

Preprint

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Abstract. The instability of the Northern Hemisphere polar vortex is mainly caused by the breaking of planetary-scale (Rossby) waves (RWs). However, gravity waves (GWs) may also play an important role in polar vortex preconditioning before breakdown events. Moreover, GWs affect dynamics in the stratosphere by altering the upward propagation of RWs at short time scales and therefore indirectly influence polar vortex stability. Due to the coarse spatial resolution of global chemistry-climate models, current efforts in climate research rely on simulations where the majority of the GW spectrum is parameterized. In the present study, we apply a recently developed method for detecting strong orographic gravity wave (OGW) drag events in the lower stratosphere above the Himalayas. For this, we use a specified dynamics simulation of the chemistry-climate model CMAM (Canadian Middle Atmosphere Model) spanning the period 1979–2010. We show that strong OGW drag events above the Himalayas are associated with anomalously increased upward RW propagation in the stratosphere. This, in turn, is associated with an increase of the refractive index in the mid-latitude lower stratosphere, a region where the OGW drag dominates. Our results also illustrate that OGW strong events have the potential to alter ozone variability via changes of mixing in the surf zone and advection from lower latitudes. Altogether, we detail a preconditioning process of the polar vortex morphology by GWs above the Himalayas and how this relates to the proximity to polar vortex breakdown.

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Section: Contextualizationmentioning

confidence: 97%

On the impact of Himalaya-induced gravity waves on the polar vortex, Rossby wave activity and ozone

Kuchař

Šácha

Eichinger

et al. 2022

Preprint

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“…Previous studies have indicated an 'ozone valley' near the UTLS over the SAH and its adjacent areas via analyzing a range of different data, such as MLS satellite (Guo et al, 2015), Ozone Monitoring Instrument (OMI), and Halogen Occultation Experiment (HALOE) data (Tang et al, 2019). The European Center for Medium-Range Weather Forecasts Interim Re-Analysis (ERA5) reanalysis data have also been used to study the UTLS ozone over the TP, due to its high temporal and spatial resolution (Chang et al, 2020b). The ERA5 monthly reanalysis data used in this study have a spatial resolution of 0.25°× 0.25°a nd vertical levels from 1,000 to 1 hPa with 37 layers in total.…”

Section: Datamentioning

confidence: 99%

“…With the development of observational methods (Mohanakumar et al, 2018;Chang et al, 2020a;Chang et al, 2020b;He et al, 2020;Mai et al, 2020), ozone concentrations can now be observed in different ways. For example, low ozone concentrations have been reported over the large scale topography of the TP using TOMS data, confirming the presence of an ozone low by zonal deviation (Zou, 1996).…”

Section: Introductionmentioning

confidence: 99%

Attribution of the Principal Components of the Summertime Ozone Valley in the Upper Troposphere and Lower Stratosphere

et al. 2021

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The key factors affecting the variation of the ‘ozone valley’, which appears during the boreal summer in the upper troposphere and lower stratosphere (UTLS) over the South Asian High (SAH) and its adjacent areas, have not been determined. This study has performed statistical analysis to improve the understanding of the roles of the sea surface temperature (SST), tropopause height, and the West Pacific Subtropical High (WPSH) on the ozone valley. Based on the European Center for Medium-Range Weather Forecasts Interim Re-Analysis (ERA5), Modern Era Retrospective Analysis for Research and Applications dataset version 2 (MERRA2), and the Stratospheric Water and Ozone Satellite Homogenized (SWOOSH) observation dataset, we examined the principal components of the zonal deviation of the total column ozone (TCO*) in the UTLS by applying the empirical orthogonal function (EOF), Liang-Kleeman information flow method, regression analysis, and composite analysis. The variations of the TCO* anomalies show three dominant modes, namely the east-west dipole mode in the low latitude region, the east-west tripole mode in the middle latitude region, and the south-north mode. According to the regression analysis and information flow, the three leading principal components of TCO* variations are related to the SST near Indonesia and the western Pacific Ocean in low latitudes, the tropopause height over the Iranian Plateau (IP), and the strength of the SAH over the eastern part of the Tibetan Plateau (TP), which is linked to the synchronousness between the SAH and the WPSH. For the east-west dipole mode in the low latitude region, composite analysis shows the interaction between the atmosphere and ocean causes the strengthening of the southern trough at 850 hPa and the divergence at 200 hPa, resulting in a decrease of the TCO* in the UTLS near the low latitude region around the TP. For the east-west tripole mode in the middle latitude region, the composite analysis shows obvious negative anomalies over the IP, where the TCO* reduces and the extent of the ozone valley over the IP increases with the rise of the tropopause. Comparatively, the south-north mode shows obvious positive anomalies over the TP, where the TCO* increases and the extent of the ozone valley over the TP decreases with a weak SAH. This mode is closely related to the location of the WPSH. In summary, the leading factors affecting the three dominant modes for the variations of the TCO* anomalies are SST, tropopause height, and the WPSH.

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“…Intensive researches [19,20] have been conducted centred on the western United States. In contrast, in China, a major effort in STT research has been qualitatively researching dynamic mechanisms in the Tibetan Plateau and Northeast China where the pollution is not serious using multiple observations [14,[21][22][23][24][25] and Lagrange models such as HYSPLIT [26][27][28] and CLaMS [29,30]. Researches have revealed that the strong downdrafts of typhoon periphery will strengthen the STT and caused the positive ozone anomalous [31][32][33][34] in heavily polluted region.…”

Section: Introductionmentioning

confidence: 99%

Influences of stratospheric intrusions to high summer surface ozone over a heavily industrialized region in northern China

Zhang

Yang

et al. 2022

Environ. Res. Lett.

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The stratospheric contribution to tropospheric ozone has long been a topic of much debate over the past few decades. In this study, we leveraged multiple datasets from surface, sounding and satellite observations to reanalysis datasets, along with a global chemical transport model (Global Nested Air Quality Prediction Modelling System, GNAQPMS) to investigate the impact of a stratospheric-to-tropospheric transport (STT) event characterized by long duration and wide range in the summer on surface high ozone episodes over heavily industrialized regions in northern China. In August 14-18, 2019, the ERA5 reanalysis datasets showed a PV tongue and a deep, upper-level trough penetrate towards 35oN over the North China Plain (NCP), indicating the occurrence of a stratospheric intrusion. From Atmospheric Infrared Sounder (AIRS) measurements, we found that the ozone-rich, stratospheric air mass had been injected into the lower altitudes. The GNAQPMS generally captured the featured layers, although there was a slight underestimation in the low troposphere. The averaged magnitudes of stratospheric contribution (O3S) and percentage (O3F) simulated by GNAQPMS were 3-20 ug/m3 and 6%-20%, respectively, while the Whole Atmosphere Community Climate Model (WACCM) indicated a higher stratospheric contribution by 3-5 ug/m3. Through this study, we give our opinions on the controversial topic of a more thorough understanding of the influence of natural processes apart from anthropogenic emissions, even in a heavily polluted region during summer.

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Response of Ozone to a Gravity Wave Process in the UTLS Region Over the Tibetan Plateau

Cited by 10 publications

References 37 publications

On the impact of Himalaya-induced gravity waves on the polar vortex, Rossby wave activity and ozone

On the impact of Himalaya-induced gravity waves on the polar vortex, Rossby wave activity and ozone

Attribution of the Principal Components of the Summertime Ozone Valley in the Upper Troposphere and Lower Stratosphere

Influences of stratospheric intrusions to high summer surface ozone over a heavily industrialized region in northern China

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