Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

Han, Han; Liu, Jane; Yuan, Huiling; Wang, Tijian; Zhuang, Bingliang; Zhang, Xun

doi:10.5194/acp-19-12495-2019

Cited by 25 publications

(14 citation statements)

References 76 publications

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“…PNECV is characterized by persistent rainfall (Ding and Chan, 2005). Under a combined effect of the northeast cold vortex and the WPSH, the Meiyu front forms and stays over the YRD (He et al, 2007). Meiyu in PNECV increases relative humidity (Fig.…”

Section: Swps (Frequency)mentioning

confidence: 99%

Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China

et al. 2020

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Abstract. Ozone pollution in China is influenced by meteorological processes on multiple scales. Using regression analysis and weather classification, we statistically assess the impacts of local and synoptic meteorology on daily variability in surface ozone in eastern China in summer during 2013–2018. In this period, summertime surface ozone in eastern China (20–42∘ N, 110–130∘ E) is among the highest in the world, with regional means of 73.1 and 114.7 µg m−3, respectively, in daily mean and daily maximum 8 h average. Through developing a multiple linear regression (MLR) model driven by local and synoptic weather factors, we establish a quantitative linkage between the daily mean ozone concentrations and meteorology in the study region. The meteorology described by the MLR can explain ∼43 % of the daily variability in summertime surface ozone across eastern China. Among local meteorological factors, relative humidity is the most influential variable in the center and south of eastern China, including the Yangtze River Delta and the Pearl River Delta regions, while temperature is the most influential variable in the north, covering the Beijing–Tianjin–Hebei region. To further examine the synoptic influence of weather conditions explicitly, six predominant synoptic weather patterns (SWPs) over eastern China in summer are objectively identified using the self-organizing map clustering technique. The six SWPs are formed under the integral influence of the East Asian summer monsoon, the western Pacific subtropical high, the Meiyu front, and the typhoon activities. On average, regionally, two SWPs bring about positive ozone anomalies (1.1 µg m−3 or 1.7 % and 2.7 µg m−3 or 4.6 %), when eastern China is under a weak cyclone system or under the prevailing southerly wind. The impact of SWPs on the daily variability in surface ozone varies largely within eastern China. The maximum impact can reach ±8 µg m−3 or ±16 % of the daily mean in some areas. A combination of the regression and the clustering approaches suggests a strong performance of the MLR in predicting the sensitivity of surface ozone in eastern China to the variation of synoptic weather. Our assessment highlights the importance of meteorology in modulating ozone pollution over China.

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Section: Swps (Frequency)mentioning

confidence: 99%

Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China

et al. 2020

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“…Using this index, Han et al (2019) found a close correlation between the EASM and ozone transport from foreign regions to East Asia. The calculation of the index was introduced in Li and Zeng (2002) and Han et al (2019). The index is respectively termed as EASM index (EASMI) and SASM index (SASMI), when it is applied to represent the strength of EASM and SASM.…”

Section: Influences Of the Asian Summer Monsoon On The Transport Of Bmentioning

confidence: 94%

“…The index was proposed by Li and Zeng (2002) and it has been widely applied to quantify the impact of the Asian monsoon on air pollutants in Asia (Mao et al, 2017;Lu et al, 2018). Using this index, Han et al (2019) found a close correlation between the EASM and ozone transport from foreign regions to East Asia. The calculation of the index was introduced in Li and Zeng (2002) and Han et al (2019).…”

Section: Influences Of the Asian Summer Monsoon On The Transport Of Bmentioning

confidence: 99%

“…Furthermore, the EASMI also correlates negatively with the zonal wind at 850 hPa over central China (Figure 10b). When the EASM is stronger, the zonal wind in the monsoon circulation weakens over this region (Yang et al, 2014;Han et al, 2019), suggesting that westward winds may occur more or with higher speed. Therefore, BC transport to the TP from central China is enhanced (Figure 10c), as a significantly positive correlation is found between the strength of the EASM and BC transport from central China to the TP surface (r=0.49, p<0.05) and between the strength of the EASM and BC transport from central China to the eastern TP surface (r=0.48, p<0.05).…”

Section: Influences Of the Asian Summer Monsoon On The Transport Of Bmentioning

confidence: 99%

“…The EAWM index (EAWMI) represents the EAWM intensity by the meridional wind shear associated with the jet stream in the upper troposphere. It can be calculated by the difference in the regional averaged zonal wind speed at 300 hPa between the areas 27.5-37.5 o N, 110-170 o E and 50-60 o N, 80-140 o E. Using the EAWMI, it is found that the EAWM is closely correlated with the interannual variation in pollution transport over East Asia (Li et al, 2016;Han et al, 2019). Furthermore, the Siberian High is a key component of the EAWM system (Wu and Wang, 2002) and its strength can be described using an index defined by Wu and Wang (2002).…”

Section: Plateaumentioning

confidence: 99%

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Impacts of atmospheric transport and biomass burning on the interannual variation in black carbon aerosols over the Tibetan Plateau

Han¹,

Wu²,

Liu³

et al. 2020

Preprint

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Abstract. Atmospheric black carbon (BC) in the Tibetan Plateau (TP) can largely impact regional and global climate. Still, studies on the interannual variation in atmospheric BC over the TP and associated variation in BC sources and controlling factors are rather limited. In this study, we characterize the variations in atmospheric BC over the TP surface layer through analysis of 20-year (1995–2014) simulations from a global chemical transport model, GEOS-Chem. The results show that, of all areas in the TP, surface BC concentrations are highest over the eastern and southern TP, where surface BC are susceptible respectively to BC transport from East Asia and South Asia. Combining the GEOS-Chem simulations and trajectories from the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model, we assess the contributions of different source regions to surface BC in the TP. On the 20-year average, over 90 % surface BC in the TP comes from South Asia (47 %) and East Asia (46 %). Regarding seasonal variation in foreign influences, South Asia and East Asia are dominant source regions in winter and summer, respectively, in terms of both magnitude and affected areas in the TP. In spring and autumn, the influences from the two source regions are somewhat comparable. Interannually, surface BC over the TP is largely modulated by atmospheric transport of BC from foreign regions year-round and by biomass burning in South Asia, mostly in spring. We find that the extremely strong biomass burning in South Asia in the spring of 1999 greatly enhanced surface BC concentrations in the TP (31 % relative to the climatology). We find that the strength of the Asian monsoon correlates significantly with the interannual variation in the amount of BC transported to the TP from foreign regions. In summer, strong East Asian summer monsoon and South Asian summer monsoon tend to, respectively, increase BC transport from central China and northeast South Asia to the TP. In winter, BC transport from central China is enhanced in years with strong East Asia winter monsoon or Siberian High. A strong Siberian High can also increase BC transport from northern South Asia to the TP. This study underscores the impacts of atmospheric transport and biomass burning on the interannual variation in surface BC over the TP. It reveals a close connection between the atmospheric transport of BC from foreign regions to the TP and the Asian monsoon.

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Effectiveness of inter-regional collaborative emission reduction for ozone mitigation under local-dominated and transport-affected synoptic patterns

Ma,

Yan,

Kong

et al. 2024

Environ Sci Pollut Res

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Foreign influences on tropospheric ozone over East Asia through global atmospheric transport

Cited by 25 publications

References 76 publications

Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China

Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China

Impacts of atmospheric transport and biomass burning on the interannual variation in black carbon aerosols over the Tibetan Plateau

Effectiveness of inter-regional collaborative emission reduction for ozone mitigation under local-dominated and transport-affected synoptic patterns

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