Boundary Layer Ozone Transport from Eastern China to Southern Japan: Pollution Episodes Observed during Monsoon Onset in 2004

Pochanart, P.; Wang, Zifa; Akimoto, Hajime

doi:10.5572/ajae.2015.9.1.048

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…The natural emissions of O 3 precursors, including NO x from lighting and soil and NMVOCs from vegetation, are calculated on the basis of the assimilated GEOS-4 meteorological fields and the GISS CGM 3 meteorological parameters. The lightning NO x emissions follow Price and Rind (1992) with the NO x vertical profile proposed by Pickering et al (1998). The soil NO x emission scheme in the GEOS-Chem model is based on the work of Yienger and Levy (1995) and Wang et al (1998).…”

Section: Globalmentioning

confidence: 99%

“…A number of previous studies have shown that Asian continental outflow impacts the global O 3 budget (Liu et al, 2002) and influences O 3 air quality in the downwind regions from the western North Pacific to western North America (Jacob et al, 1999;Tanimoto et al, 2005;Kim et al, 2006;Li et al, 2008;Zhang et al, 2008;Chiang et al, 2009;Huang et al, 2010;Nagashima et al, 2010;Walker et al, 2010;Ambrose et al, 2011;Lin et al, 2012;Ou-Yang et al, 2013;Han et al, 2015;Pochanart et al, 2015). Liu et al (2002) reported that boundary-layer O 3 pollution was lifted into the upper troposphere by deep convection over the Asian maritime continent.…”

Section: Introductionmentioning

confidence: 99%

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Interannual variation, decadal trend, and future change in ozone outflow from East Asia

et al. 2017

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Abstract. We examine the past and future changes in the O3 outflow from East Asia using a global 3-D chemical transport model, GEOS-Chem. The simulations of Asian O3 outflow for 1986–2006 are driven by the assimilated GEOS-4 meteorological fields, and those for 2000–2050 are driven by the meteorological fields archived by the NASA Goddard Institute for Space Studies (GISS) general circulation model (GCM) 3 under the IPCC SRES A1B scenario. The evaluation of the model results against measurements shows that the GEOS-Chem model captures the seasonal cycles and interannual variations of tropospheric O3 concentrations fairly well with high correlation coefficients of 0.82–0.93 at four ground-based sites and 0.55–0.88 at two ozonesonde sites where observations are available. The increasing trends in surface-layer O3 concentrations in East Asia over the past 2 decades are captured by the model, although the modeled O3 trends have low biases. Sensitivity studies are conducted to examine the respective impacts of meteorological parameters and emissions on the variations in the outflow flux of O3. When both meteorological parameters and anthropogenic emissions varied from 1986–2006, the simulated Asian O3 outflow fluxes exhibited a statistically insignificant decadal trend; however, they showed large interannual variations (IAVs) with seasonal values of 4–9 % for the absolute percent departure from the mean (APDM) and an annual APDM value of 3.3 %. The sensitivity simulations indicated that the large IAVs in O3 outflow fluxes were mainly caused by variations in the meteorological conditions. The variations in meteorological parameters drove the IAVs in O3 outflow fluxes by altering the O3 concentrations over East Asia and by altering the zonal winds; the latter was identified to be the key factor, since the O3 outflow was highly correlated with zonal winds from 1986–2006. The simulations of the 2000–2050 changes show that the annual outflow flux of O3 will increase by 2.0, 7.9, and 12.2 % owing to climate change alone, emissions change alone, and changes in both climate and emissions, respectively. Therefore, climate change will aggravate the effects of the increases in anthropogenic emissions on future changes in the Asian O3 outflow. Future climate change is predicted to greatly increase the Asian O3 outflow in the spring and summer seasons as a result of the projected increases in zonal winds. The findings from the present study help us to understand the variations in tropospheric O3 in the downwind regions of East Asia on different timescales and have important implications for long-term air quality planning in the regions downwind of China, such as Japan and the US.

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Section: Globalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interannual variation, decadal trend, and future change in ozone outflow from East Asia

et al. 2017

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“…Air pollution is one of these concerns, especially considering that long-range transports of the air pollution from Chinese emissions could become regional and global problems and could alter the regional air chemistry (Akimoto 2003;Pochanart et al 2015;Wild et al 2004). The remote sensing techniques using satellite data have verified the increase of tropospheric NO 2 , an important precursor of ozone and an indicator of anthropogenic emissions over China, especially in the central eastern region (Irie et al 2005;Richter et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Residence time analysis of photochemical buildup of ozone in central eastern China from surface observation at Mt. Tai, Mt. Hua, and Mt. Huang in 2004

Pochanart

2015

Environ Sci Pollut Res

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Using data from surface observation, backward trajectories, and residence time analysis, the amounts of regional photochemical ozone buildup due to the large-scale anthropogenic sources in central eastern China (CEC, 30.5-40.5 N, 112.5-122.5 E) at Mt. Tai, Mt. Hua, and Mt. Huang in 2004 were quantified. It was found that the CEC anthropogenic sources influenced the air masses and the associated ozone production most at Mt. Tai, located at the center of CEC domain. At Mt. Hua to the west of CEC domain and at Mt. Huang to the south of CEC domain, the air masses and the associated ozone production showed less CEC anthropogenic influences on a regional scale. At Mt. Tai and Mt. Huang, the ozone mixing ratios in the air masses that passed over polluted source regions in CEC increased during the first 40-70 h after arrival and showed the highest production rate of 31.2 and 12.2 ppb/day, respectively, in May and June. It was estimated that the CEC anthropogenic sources contributed 34-42% of ozone at Mt. Tai and 8-14% at Mt. Huang during this ozone peak season. The large contributions from CEC sources during fall season (Sep-Nov) were also estimated as 31-44 and 17-23% but with the lower ozone production rate of 22.6 and 8.4 ppb/day, respectively, for Mt. Tai and Mt. Huang.

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Persistent ozone pollution episodes in North China exacerbated by regional transport

Gong

Liao

Zhang

et al. 2020

Environmental Pollution

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Boundary Layer Ozone Transport from Eastern China to Southern Japan: Pollution Episodes Observed during Monsoon Onset in 2004

Cited by 5 publications

References 39 publications

Interannual variation, decadal trend, and future change in ozone outflow from East Asia

Interannual variation, decadal trend, and future change in ozone outflow from East Asia

Residence time analysis of photochemical buildup of ozone in central eastern China from surface observation at Mt. Tai, Mt. Hua, and Mt. Huang in 2004

Persistent ozone pollution episodes in North China exacerbated by regional transport

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