Statistical Analysis of the Spatiotemporal Distribution of Ozone Induced by Cut-Off Lows in the Upper Troposphere and Lower Stratosphere over Northeast Asia

Chen, Dan; Zhou, T.; Liyun, Ma; Shi, Chunhua; Guo, Dong; Chen, Li

doi:10.3390/atmos10110696

Cited by 4 publications

(2 citation statements)

References 45 publications

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“…The ozone layer absorbs ultraviolet radiation from the Sun and protects the surface biosphere from damaging radiation. Atmospheric fluctuations in the troposphere are uploaded to the stratosphere (Shepherd, 2002;Xie et al, 2012;He et al, 2020a,b;Yu et al, 2020), leading to the abnormal distribution of ozone in the stratosphere (Chen et al, 2019) and affecting the Earth's climate (Bian et al, 2013;Lu and Ding, 2013;Xie et al, 2016;Li et al, 2017). Some anthropogenic ozone-depleting substances (ODSs), such as chlorofluorocarbons (CFCs) and halons, may also be transported to the stratosphere and influence the stratospheric ozone, while stratospheric ozone may transport to the troposphere and influence the tropospheric ozone (Elliot and Rowland, 1987;Schauffler et al, 1999;Butchart and Scaife, 2001;Newman et al, 2009;Oram et al, 2017;Wang et al, 2019Wang et al, , 2020.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Vertical Velocity in the Asian Summer Monsoon Anticyclone Region Using the Thermodynamic Method With in situ and Satellite Data

et al. 2020

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Correctly calculating the vertical velocity of the Asian summer monsoon anticyclone (ASMA) region is helpful for accurately knowing the ozone stratosphere-troposphere exchange, so as to explore the variation of ozone in the ASMA region. Therefore, the vertical velocity over the ASMA in June, July, August, and September 2012 and 2016 was calculated using the thermodynamic method, which may avoid the deviations produced by the kinematics method using the mass continuity equation. In order to improve the accuracy, we used high-resolution heating rate datasets obtained via the radiation model in Canadian Atmospheric Global Climate Model called CanAM4.3_RAD based on in situ observations and revised satellite data from MLS/AIRS. The vertical velocity calculated by the thermodynamic method (V T) is then compared with the data from ERA-Interim (V ERA−I). In the daytime, values of V T were similar to V ERA−I and were dominated by ascending motion, although V T showed descending motion at the western edge of the ASMA below 100 hPa. The intensity of V T was slightly smaller than that of V ERA−I at lower levels (200-100 hPa) over the ASMA region and significantly weaker above 100 hPa. The situation was more complex at night. Both V T and V ERA−I showed the convergence of vertical wind at 150 hPa and the divergence at 80 hPa, but V T had a smaller standard deviation. V T showed descending in the western and northern ASMA, but V ERA−I only descended in the west. The descending motion in the west, seen in both V T and V ERA−I , is produced by the heating difference between the Qinghai-Tibet Plateau and the Iranian Plateau. The difference of the two vertical velocities in the northern ASMA may indicate the different understandings of the local Hadley Circulation and local Brewer-Dobson Circulation.

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Section: Introductionmentioning

confidence: 99%

Calculation of the Vertical Velocity in the Asian Summer Monsoon Anticyclone Region Using the Thermodynamic Method With in situ and Satellite Data

et al. 2020

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“…Their results showed that, on average, COLs induced a 32% increase of O 3 in the UTLS region. Combining multiyear satellite and reanalysis data, Chen et al (2019) performed another statistical investigation on the spatiotemporal change of UTLS O 3 induced by COLs 95 over the Northeast Asia region. Their statistical results indicated that the magnitude and distribution of ozone enhancements were closely related to the evolution of COLs lifecycle.…”

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Impact of upper-level circulation on upper troposphere and lower stratosphere ozone distribution over Northeast Asia

Liao,

Zhang,

Pan

et al. 2023

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Abstract. Ozone (O3) in the upper troposphere and lower stratosphere (UTLS) is strongly regulated by upper-level circulation dynamics. Understanding the coupling between UTLS O3 distribution and upper-level circulation dynamics is important not only to understand synoptic processes governing O3 distribution and variability, but also to test the fidelity of chemistry transport models in simulating the stratosphere–troposphere exchange (STE) processes. This study presents the first systematic assessment of observationally constrained UTLS O3 variability associated with upper-level circulation patterns over the Northeast Asia region. By applying the self-organized mapping (SOM) technique to 500, 250, and 100 hPa geopotential height (GPH) data, 12 circulation patterns are quantified and then used to characterize the UTLS O3 distribution in the period 2000–2020 in both four-site (Beijing, Pohang, Tateno, and Sapporo) ozonesonde data and regional-scale satellite products. The underlying dynamic transport mechanism responsible for UTLS O3 responses to different circulation patterns are further explored through correlation analysis between O3 anomalies and transport indicators. The results indicate that although O3 at almost all altitudes shows statistically significant sensitivity to circulation patterns, lower-stratospheric O3 exhibits a far stronger sensitivity when compared with upper-tropospheric O3. Circulation patterns featuring the East Asian Trough (EAT) show clear enhancement of O3 southwest of the trough, and the enhancement zone moves with the eastward propagation of the EAT. Circulation patterns featuring eastward-shedding vortices of the Asia Summer Monsoon Anticyclone (ASMA) show the opposite signal, in which O3 concentrations are decreased, especially at Sapporo, and the negative O3 anomaly zone stretches from South Japan to Sakhalin Island. Each circulation pattern is characterized by distinct transport pathways, which play a determining role in the pattern-specific UTLS O3 response. Positive O3 anomalies are usually associated with post-trough downward and southward transport, whereas negative O3 anomalies are commonly associated with fore-trough upward and northward transport. In the lower stratosphere, the correlation between O3 anomalies and transport indicators is significantly stronger than that in the upper troposphere, and the strongest correlation occurs in the lower stratosphere of Beijing.

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Simulation of the Multi-Timescale Stratospheric Intrusion Processes in a Typical Cut-Off Low over Northeast Asia

et al. 2021

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This study used the FLEXPART-WRF trajectory model to perform forward and backward simulations of a cut-off low (COL) event over northeast Asia. The analysis reveals the detailed trajectories and sources of air masses within the COL. Their trajectories illustrate the multi-timescale deep intrusion processes in the upper troposphere and lower stratosphere (UTLS) caused by the COL. The processes of air intrusion from the lower stratosphere to the middle troposphere can be divided into three stages: a slow descent stage, a rapid intrusion stage and a relatively slow intrusion stage. A source analysis of targeted air masses at 300 hPa and 500 hPa shows that the ozone-rich air in the COL primarily originated from an extratropical cyclone over central Siberia and from the extratropical jet stream. The sources of air masses in different parts of the COL show some differences. These results can help explain the ozone distribution characteristics in the main body of a COL at 300 hPa and at 500 hPa that were revealed in a previous study.

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Statistical Analysis of the Spatiotemporal Distribution of Ozone Induced by Cut-Off Lows in the Upper Troposphere and Lower Stratosphere over Northeast Asia

Cited by 4 publications

References 45 publications

Calculation of the Vertical Velocity in the Asian Summer Monsoon Anticyclone Region Using the Thermodynamic Method With in situ and Satellite Data

Calculation of the Vertical Velocity in the Asian Summer Monsoon Anticyclone Region Using the Thermodynamic Method With in situ and Satellite Data

Impact of upper-level circulation on upper troposphere and lower stratosphere ozone distribution over Northeast Asia

Simulation of the Multi-Timescale Stratospheric Intrusion Processes in a Typical Cut-Off Low over Northeast Asia

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