Modeling study of ozone seasonal cycle in lower troposphere over east Asia

Li, Jie; Wang, Zifa; Akimoto, Hajime; Gao, Chao; Pochanart, P.; Wang, Xiquan

doi:10.1029/2006jd008209

Cited by 129 publications

(114 citation statements)

References 62 publications

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“…The EASM prevails in May-September every year, with strong southerlies bringing clean, warm, and moist air from the oceans to eastern China and rain belts that stretch for thousands of kilometers in the west-east direction in eastern China (Tao and Chen, 1987;Wang and Ding, 2008). Previous observational and modeling studies have shown that such patterns of winds and precipitation of the EASM influence the seasonal variations of O 3 in China (Chan et al, 1998;Li et al, 2007;He et al, 2008;Wang et al, 2011) and in the western Pacific region (Pochanart et al, 2002;Tanimoto et al, 2005;Yamaji et al, 2006). He et al (2008) analyzed the seasonal variations of O 3 concentrations measured over the period [2004][2005][2006] and found that O 3 concentrations peak in spring and autumn with a summer trough in central eastern China and the western Pacific, the areas that are influenced by clean air from the southern oceans during the summer monsoon.…”

Section: H Liao Et Al: Interannual Variations Of Summertime Surfacementioning

confidence: 99%

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Impacts of the East Asian summer monsoon on interannual variations of summertime surface-layer ozone concentrations over China

2014

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Abstract. We apply a global three-dimensional Goddard Earth Observing System (GEOS) chemical transport model (GEOS-Chem) driven by the NASA/GEOS-4 assimilated meteorological fields to quantify the impacts of the East Asian summer monsoon (EASM) on interannual variations of June-July-August (JJA) surface-layer O 3 concentrations over China. With anthropogenic emissions fixed at year 2005 levels, the model simulation for years shows that the changes in meteorological parameters alone lead to interannual variations in JJA surface-layer O 3 concentrations by 2-5 % over central eastern China, 1-3 % in northwestern China, and 5-10 % over the Tibetan Plateau as well as the border and coastal areas of southern China, as the interannual variations are relative to the average O 3 concentrations over the 21 yr period. Over the years 1986-2006, the O 3 concentration averaged over all of China is found to correlate positively with the EASM index with a large correlation coefficient of +0.75, indicating that JJA O 3 concentrations are lower (or higher) in weaker (or stronger) EASM years. Relative to JJA surface-layer O 3 concentrations in the strongest EASM years (1990, 1994, 1997, 2002, and 2006), O 3 levels in the weakest EASM years (1988, 1989, 1996, 1998, and 2003) are lower over almost all of China with a national mean lower O 3 concentration by 2.0 ppbv (parts per billion by volume; or 4 %). Regionally, the largest percentage differences in O 3 concentration between the weakest and strongest EASM years are found to exceed 6 % in northeastern China, southwestern China, and over the Tibetan Plateau. Sensitivity studies show that the difference in transboundary transport of O 3 is the most dominant factor that leads to lower-O 3 concentrations in the weakest EASM years than in the strongest EASM years, which, together with the enhanced vertical convections in the weakest EASM years, explain about 80 % of the differences in surface-layer O 3 concentrations between the weakest and strongest EASM years. We also find that the impacts the EASM strength on JJA surface-layer O 3 can be particularly strong (comparable in magnitude to the impacts on O 3 by changes in anthropogenic emissions over years for certain years. The largest increases in O 3 by anthropogenic emissions are simulated over southeastern China, whereas the largest impacts of the EASM on O 3 are found over central and western China.

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Section: H Liao Et Al: Interannual Variations Of Summertime Surfacementioning

confidence: 99%

“…The formulation for calculating EASMI based on the GEOS-4 meteorological parameters was given in Zhu et al (2012). (Chan et al, 1998;Yamaji et al, 2006;Li et al, 2007;He et al, 2008;Wang et al, 2011). In western China, simulated O 3 exhibits maximum concentrations of 65 ppbv.…”

Section: East Asian Summer Monsoon Indexmentioning

confidence: 99%

Impacts of the East Asian summer monsoon on interannual variations of summertime surface-layer ozone concentrations over China

2014

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“…A number of regional CTMs have been employed to study episodic chemical transport and transformations of Asian pollutants in springtime (e.g. Carmichael et al, 2003c;Zhang et al, 2003;Wang et al, 2006), and the seasonal cycle of surface O 3 in Eastern China (Li et al, 2007) and Japan (Yamaji et al, 2006). Results from the MICS-Asia regional model intercomparison study found that O 3 predictions for July over Central Eastern China differ by ∼20 ppbv among seven regional CTMs .…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies over Eastern China report that surface O 3 exhibits a narrow peak in early summer (May or June) and a sharp drop in July and August, based on measurements Published by Copernicus Publications on behalf of the European Geosciences Union. taken in downwind of Beijing (Ding et al, 2008;Lin et al, 2008c), at three mountaintop sites (Li et al, 2007), and at a rural site near Shanghai (Xu et al, 2008). Previous studies have suggested that the East Asia monsoon is responsible for the observed summer minimum of boundary layer O 3 along the west Pacific coast (Liu et al, 2002;He et al, 2008, and references therein).…”

Section: Introductionmentioning

confidence: 99%

Multi-scale model analysis of boundary layer ozone over East Asia

et al. 2009

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Abstract. This study employs the regional Community Multiscale Air Quality (CMAQ) model to examine seasonal and diurnal variations of boundary layer ozone (O 3 ) over East Asia. We evaluate the response of model simulations of boundary layer O 3 to the choice of chemical mechanisms, meteorological fields, boundary conditions, and model resolutions. Data obtained from surface stations, aircraft measurements, and satellites are used to advance understanding of O 3 chemistry and mechanisms over East Asia and evaluate how well the model represents the observed features. Satellite measurements and model simulations of summertime rainfall are used to assess the impact of the Asian monsoon on O 3 production. Our results suggest that summertime O 3 over Central Eastern China is highly sensitive to cloud cover and monsoonal rainfall over this region. Thus, accurate simulation of the East Asia summer monsoon is critical to model analysis of atmospheric chemistry over China. Examination of hourly summertime O 3 mixing ratios from sites in Japan confirms the important role of diurnal boundary layer fluctuations in controlling ground-level O 3 . By comparing five different model configurations with observations at six sites, the specific mechanisms responsible for model behavior are identified and discussed. In particular, vertical mixing, urban chemistry, and dry deposition depending on boundary layer height strongly affect model ability to capture observed behavior. Central Eastern China appears to be the most sensitive region in our study to the choice of chemical mechanisms. Evaluation with TRACE-P aircraft measurements reveals that neither the CB4 nor the SAPRC99 mechCorrespondence to: M. Lin (mlin26@wisc.edu) anisms consistently capture observed behavior of key photochemical oxidants in springtime. However, our analysis finds that SAPRC99 performs somewhat better in simulating mixing ratios of H 2 O 2 (hydrogen peroxide) and PAN (peroxyacetyl nitrate) at flight altitudes below 1 km. The high level of uncertainty associated with O 3 production in Central Eastern China poses a major problem for regional air quality management. This highly polluted, densely populated region would greatly benefit from comprehensive air quality monitoring and the development of model chemical mechanisms appropriate to this unique atmospheric environment.

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“…The model has been used to study issues related to transport of air pollutants and related chemical processes, the interaction between mineral aerosols and acid rain over east Asia on a regional scale (Huang et al 1995;Wang et al 2002;Li et al 2007), and the impact of mobile sources on air quality in Beijing on an urban scale (Wu et al 2010). Compared with the sensitive analysis method employing intermittent emission, the online tagged method is an alternative and more efficient approach to evaluating the importance of various tagged regions.…”

Section: Air Pollutant Tagged Methodsmentioning

confidence: 99%

Gravity-Current-Driven Transport of Haze from the North China Plain to Northeast China in Winter 2010-Part 2: Model Simulation with Tagged Tracers

Yang

Wang

et al. 2013

SOLA

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In this study, the Nested Air Quality Prediction Model System (NAQPMS) with an online air pollutant tagged module was employed to investigate the contribution of regional transport from the North China Plain (NCP) to Northeast (NE) China during a severe haze episode in the winter of 2010. For simulating particulate matter with a diameter of less than 10 µm (PM 10 ), the NAQPMS model was in good overall agreement with observations in NCP and NE China. Using the tagged module, contribu tions from regional transport and local sources to the ground PM 10 concentration at four representative sites, namely Yingkou, Liaoyang, Tieling, and Jilin, along the haze transport pathway in NE were estimated. The results showed that the regional contribution from the Beijing-Tianjin-Hebei area and Shandong Province accounted for 33−87% of the PM 10 pollution on average at the above four sites, with the contribution decreasing along the pathway from NCP to NE. The impact of regional transport on the peak PM 10 concentrations at the four sites was also investigated. The contribution of the Beijing-Tianjin-Hebei area to PM 10 pollution was 73% at the nearest site Yingkou and 30% at the farthest site Jilin, which is approximately 1500 km from Beijing. Our results demonstrate that Beijing-Tianjin-Hebei may significantly contribute to haze pollution in NE, particularly under favorable meteorological conditions. Thus, efforts to improve the air quality in NE China need to focus on controlling both local and regional emissions, particularly from the downwind NCP.(Citation: Yang. T., X. Wang, Z. Wang, Y. Sun, W. Zhang, Y. Du, and J. Li, 2013: Gravity-current-driven transport of haze from the North China Plain to Northeast China in winter 2010-Part 2: Model simulation with tagged tracers. SOLA, 9, 60−64,

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Modeling study of ozone seasonal cycle in lower troposphere over east Asia

Cited by 129 publications

References 62 publications

Impacts of the East Asian summer monsoon on interannual variations of summertime surface-layer ozone concentrations over China

Impacts of the East Asian summer monsoon on interannual variations of summertime surface-layer ozone concentrations over China

Multi-scale model analysis of boundary layer ozone over East Asia

Gravity-Current-Driven Transport of Haze from the North China Plain to Northeast China in Winter 2010-Part 2: Model Simulation with Tagged Tracers

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