The Impacts of Meteorology on the Seasonal and Interannual Variabilities of Ozone Transport From North America to East Asia

Zhu, Ye; Liu, Jane; Wang, Tijian; Zhuang, Bingliang; Han, Han; Wang, Hengmao; Chang, Yi; Ding, K. Y.

doi:10.1002/2017jd026761

Cited by 16 publications

(7 citation statements)

References 100 publications

(205 reference statements)

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“…The spatiotemporal variations of tropospheric O 3 are substantial at global and regional scales. In addition to photochemical reactions associated with O 3 precursor emissions and solar radiation, the atmospheric transport of O 3 and its precursors, including horizontal transport (Wolff et al, 1977;Yienger et al, 2000;Wild and Akimoto, 2001;Lelieveld et al, 2002;Duncan et al, 2008;Liu et al, 2011;Zhu et al, 2017;Han et al, 2018) and vertical transport, e.g., exchange between stratosphere and troposphere (Hu et al, 2010;Jiang et al, 2015), plays an important role in determining the spatiotemporal distribution of this species in the troposphere.…”

Section: Introductionmentioning

confidence: 99%

An important mechanism of regional O<sub>3</sub> transport for summer smog over the Yangtze River Delta in eastern China

Zhao

et al. 2018

Atmos. Chem. Phys.

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Abstract. Severe ozone (O3) pollution episodes plague a few regions in eastern China at certain times of the year, e.g., the Yangtze River Delta (YRD). However, the formation mechanisms, including meteorological factors, contributing to these severe pollution events remain elusive. A severe summer smog stretched over the YRD region from 22 to 25 August 2016. This event displayed hourly surface O3 concentrations that exceeded 300 µg m−3 on 25 August in Nanjing, an urban area in the western YRD. The weather pattern during this period was characterized by near-surface prevailing easterly winds and continuous high air temperatures. The formation mechanism responsible for this O3 pollution episode over the YRD region, particularly the extreme values over the western YRD, was investigated using observation data and by running simulations with the Weather Research and Forecasting model with Chemistry (WRF-Chem). The results showed that the extremely high surface O3 concentration in the western YRD area on 25 August was largely due to regional O3 transport in the nocturnal residual layer (RL) and the diurnal change in the atmospheric boundary layer. On 24 August, high O3 levels, with peak values of 220 µg m−3, occurred in the daytime mixing layer over the eastern YRD region. During nighttime from 24 to 25 August, a shallow stable boundary layer formed near the surface which decoupled the RL above it from the surface. Ozone in the decoupled RL remained quite constant, which resulted in an O3-rich “reservoir” forming in this layer. This reservoir persisted due to the absence of O3 consumption from nitrogen oxide (NO) titration or dry deposition during nighttime. The prevailing easterly winds in the lower troposphere governed the regional transport of this O3-rich air mass in the nocturnal RL from the eastern to the western YRD. As the regional O3 transport reached the RL over the western YRD, O3 concentrations in the RL accumulated and rose to 200 µg m−3 over the western Nanjing site during the sunrise hours on 25 August. The development of the daytime convective boundary layer after sunrise resulted in the disappearance of the RL, as the vertical mixing in the convective boundary layer uniformly redistributed O3 from the upper levels via the entrainment of O3-rich RL air down to the O3-poor air at the ground. This net downward transport flux reached up to 35 µg m−3 h−1, and contributed a considerable surface O3 accumulation, resulting in severe daytime O3 pollution during the summer smog event on 25 August in the western YRD region. The mechanism of regional O3 transport through the nocturnal RL revealed in this study has great implications regarding understanding O3 pollution and air quality change.

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Section: Introductionmentioning

confidence: 99%

An important mechanism of regional O<sub>3</sub> transport for summer smog over the Yangtze River Delta in eastern China

Zhao

et al. 2018

Atmos. Chem. Phys.

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“…The Asian winter monsoon is a predominant climate feature in Asia and an important modulator of the distribution and transport of air pollutants (Mao et al, 2017;Zhu et al, 2017). However, the impact of the Asian winter monsoon on the interannual variation in BC transport to the TP scantly studied.…”

Section: Plateaumentioning

confidence: 99%

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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“…American ozone that influences Asia mostly over high altitudes (north of 30N) (Wild et al, 2004;Holloway et al, 2008;Nagashima et al, 2010;Zhu et al, 2017b) (Wild et al, 2004;Sudo and Akimoto, 2007;Zhu et al, 2017b). North of 50 o N, African ozone influence is small, i.e., less than 4 ppbv and 2 ppbv, respectively, above and below the Asian 210 middle troposphere.…”

Section: Seasonal Variation In Imported African Ozone Over Asiamentioning

confidence: 99%

“…For the interannual variation, our purpose is focused on the impact of meteorology on the transport of African ozone to Asia. Therefore, the 155 meteorology was set to vary from year to year, while a fixed chemistry was used for the 20-year simulation, i. e., with the archived daily ozone production and loss data in 2005, similar to the treatments in previous studies that examined the influences of meteorology on pollution transport (Liu et al, 2011;Zhao et al, 2012;Sekiya and Sudo, 2014;Zhu et al, 2017b).…”

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Characteristics of intercontinental transport of tropospheric ozone from Africa to Asia

Han¹,

Liu²,

Yuan³

et al. 2017

Preprint

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The Impacts of Meteorology on the Seasonal and Interannual Variabilities of Ozone Transport From North America to East Asia

Cited by 16 publications

References 100 publications

An important mechanism of regional O<sub>3</sub> transport for summer smog over the Yangtze River Delta in eastern China

An important mechanism of regional O<sub>3</sub> transport for summer smog over the Yangtze River Delta in eastern China

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

Characteristics of intercontinental transport of tropospheric ozone from Africa to Asia

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The Impacts of Meteorology on the Seasonal and Interannual Variabilities of Ozone Transport From North America to East Asia

Cited by 16 publications

References 100 publications

An important mechanism of regional O&lt;sub&gt;3&lt;/sub&gt; transport for summer smog over the Yangtze River Delta in eastern China

An important mechanism of regional O&lt;sub&gt;3&lt;/sub&gt; transport for summer smog over the Yangtze River Delta in eastern China

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

Characteristics of intercontinental transport of tropospheric ozone from Africa to Asia

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An important mechanism of regional O<sub>3</sub> transport for summer smog over the Yangtze River Delta in eastern China

An important mechanism of regional O<sub>3</sub> transport for summer smog over the Yangtze River Delta in eastern China