Numerical study of boundary layer ozone transport and photochemical production in east Asia in the wintertime

Zhang, Meigen; Uno, Itsushi; Sugata, Seiji; Wang, Zifa; Byun, Daewon W.; Akimoto, Hajime

doi:10.1029/2001gl014368

Cited by 54 publications

(33 citation statements)

References 11 publications

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“…It has successfully applied to investigate the Asian continental outflow of carbon monoxide, ozone, and aerosol sulfate to the western Pacific Ocean by a number of serious researches (Zhang et al, 2002;Uno et al, 2005;Yamaji et al, 2006).…”

Section: Model Description and Validationmentioning

confidence: 99%

A modeling analysis of a heavy air pollution episode occurred in Beijing

et al. 2007

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Abstract. The concentrations of fine particulate matter (PM) and ozone in Beijing often exceed healthful levels in recent years, therefore China is to taking steps to improve Beijing's air quality for the 2008 Olympic Games. In this paper, the Models-3 Community Multiscale Air Quality (CMAQ) Modeling System was used to investigate a heavy air pollution episode in Beijing during 3-7 April 2005 to obtain the basic information of how heavy air pollution formed and the contributions of local sources and surround emissions. The modeling domain covered from East Asia with four nested grids with 81 to 3 km horizontal resolution focusing on urban Beijing. This was coupled with a regional emissions inventory with a 10 km resolution and a local 1 km Beijing emissions database. The trend of predicted concentrations of various pollutants agreed reasonably well with the observations and captured the main features of this heavy pollution episode. The simulated column concentration distribution of PM was correlated well with the MODIS remote sensing products. Control runs with and without Beijing emissions were conducted to quantify the contributions of non-Beijing sources (NBS) to the Beijing local air pollution. The contributions of NBS to each species differed spatially and temporally with the order of PM 2.5 >PM 10 >SO 2 > soil for this episode. The percentage contribution of NBS to fine particle (PM 2.5 ) in Beijing was averaged about 39%, up to 53% at the northwest of urban Beijing and only 15% at southwest. The spatial distribution of NBS contributions for PM 10 was similar to that for PM 2.5 , with a slightly less average percentage of about 30%. The average NBS contributions for SO 2 and soil (diameter between 2.5 µm and 10 µm) were 18% and 10%. In addition, the pollutant transport flux was calculated and compared at different levels to investigate transport pathway and magnitude. It was found that the NBS contribution correlated with the transport flux, contributing 60% of PM 10 concenCorrespondence to: Z. Wang (zifawang@mail.iap.ac.cn) tration in Beijing at the time of transport flux peak during a strong episode with a transport path from southwest to northeast.

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Section: Model Description and Validationmentioning

confidence: 99%

A modeling analysis of a heavy air pollution episode occurred in Beijing

et al. 2007

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“…In this paper, the air quality modeling system Regional Atmospheric Modeling System-Community Multi-scale Air Quality (RAMS-CMAQ) 21 was employed to study the complex sequence of physical and chemical processes involved in acid deposition in East Asia. The RAMS-CMAQ modeling system contains two major components, the Community Multi-scale Air Quality (CMAQ) 22 and the Regional Atmospheric Modeling System (RAMS).…”

Section: Model Descriptionmentioning

confidence: 99%

Simulated Seasonal Variations in Wet Acid Depositions over East Asia

Zhang

Zhu³

et al. 2011

Journal of the Air & Waste Management Association

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The air quality modeling system Regional Atmospheric Modeling System-Community Multi-scale Air Quality (RAMS-CMAQ) was applied to analyze temporospatial variations in wet acid deposition over East Asia in 2005, and model results obtained on a monthly basis were evaluated against extensive observations, including precipitation amounts at 704 stations and SO 4 2À , NO 3 À , and NH 4 þ concentrations in the atmosphere and rainwater at 18 EANET (the Acid Deposition Monitoring Network in East Asia) stations. The comparison shows that the modeling system can reasonably reproduce seasonal precipitation patterns, especially the extensive area of dry conditions in northeast China and north China and the major precipitation zones. For ambient concentrations and wet depositions, the simulated results are in reasonable agreement (within a factor of 2) with observations in most cases, and the major observed features are mostly well reproduced. The analysis of modeled wet deposition distributions indicates that East Asia experiences noticeable variations in its wet deposition patterns throughout the year. In winter, southern China and the coastal areas of the Japan Sea report higher SO 4 2À and NO 3 À wet depositions. In spring, elevated SO 4 2À and NO 3 À wet depositions are found in northeastern China, southern China, and around the Yangtze River. In summer, a remarkable rise in precipitation in northeastern China, the valleys of the Huaihe and Yangtze rivers, Korea, and Japan leads to a noticeable increase in SO 4 2À and NO 3 À wet depositions, whereas in autumn, higher SO 4 2À and NO 3 À wet depositions are found around Sichuan Province. Meanwhile, due to the high emission of SO 2 , high wet depositions of SO 4 2À are found throughout the entire year in the area surrounding Sichuan Province. There is a tendency toward decreasing NO 3 À concentrations in rainwater from China through Korea to Japan in both observed and simulated results, which is a consequence of the influence of the continental outflow from Eurasia. The same tendency is not found for SO 4 2À .

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“…They also provide recent emission trends, but such a long-term CTM study has not yet been reported for Asia. As successful applications for Asian air quality studies, the community multi-scale air quality model (CMAQ; Byun and Ching, 1999) has been used intensively by Zhang et al (2002), Uno et al (2005), Tanimoto et al (2005), and Yamaji et al (2006a). Herein, we report the results of systematic analyses of seasonal and interannual variations of NO 2 VCDs based on GOME data and the regional scale CTM, CMAQ, and sensitivity experiments with the latest emission inventory in Asia from 1996 to 2003.…”

Section: Introductionmentioning

confidence: 99%

Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO<sub>2</sub> in Asia and comparison with GOME-satellite data

et al. 2007

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Abstract. Systematic analyses of interannual and seasonal variations of tropospheric NO 2 vertical column densities (VCDs) based on GOME satellite data and the regional scale chemical transport model (CTM), Community Multi-scale Air Quality (CMAQ), are presented for the atmosphere over eastern Asia between 1996 and June 2003. A newly developed year-by-year emission inventory (REAS) was used in CMAQ. The horizontal distribution of annual averaged GOME NO 2 VCDs generally agrees well with the CMAQ results. However, CMAQ/REAS results underestimate the GOME retrievals with factors of 2-4 over polluted industrial regions such as Central East China (CEC), a major part of Korea, Hong Kong, and central and western Japan. The most probable reasons for the underestimation typically over the CEC are accuracy of the basic energy statistic data, emission factors, and socio-economic data used for construction of emission inventory. For the Japan region, GOME and CMAQ NO 2 data show reasonable agreement with respect to interannual variation and show no clear increasing trend. For CEC, GOME and CMAQ NO 2 data indicate a very rapid increasing trend from 2000. Analyses of the seasonal cycle of NO 2 VCDs show that GOME data have larger dips than CMAQ NO 2 during February-April and September-November. Sensitivity experiments with fixed emission intensity reveal that the detection of emission trends from satellite in fall or winter has a larger error caused by the variability of meteorology. Examination during summer time and annual averaged NO 2 VCDs are robust with respect to variability of meteoCorrespondence to: I. Uno (uno@riam.kyushu-u.ac.jp) rology and are therefore more suitable for analyses of emission trends. Analysis of recent trends of annual emissions in China shows that the increasing trends of 1996-1998 and 2000-2002 for GOME and CMAQ/REAS show good agreement, but the rate of increase by GOME is approximately 10-11% yr −1 after 2000; it is slightly steeper than CMAQ/REAS (8-9% yr −1 ). The greatest difference was apparent between the years 1998 and 2000: CMAQ/REAS only shows a few percentage points of increase, whereas GOME gives a greater than 8% yr −1 increase. The exact reason remains unclear, but the most likely explanation is that the emission trend based on the Chinese emission related statistics underestimates the rapid growth of emissions.

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Numerical study of boundary layer ozone transport and photochemical production in east Asia in the wintertime

Cited by 54 publications

References 11 publications

A modeling analysis of a heavy air pollution episode occurred in Beijing

A modeling analysis of a heavy air pollution episode occurred in Beijing

Simulated Seasonal Variations in Wet Acid Depositions over East Asia

Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO<sub>2</sub> in Asia and comparison with GOME-satellite data

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Numerical study of boundary layer ozone transport and photochemical production in east Asia in the wintertime

Cited by 54 publications

References 11 publications

A modeling analysis of a heavy air pollution episode occurred in Beijing

A modeling analysis of a heavy air pollution episode occurred in Beijing

Simulated Seasonal Variations in Wet Acid Depositions over East Asia

Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO&lt;sub&gt;2&lt;/sub&gt; in Asia and comparison with GOME-satellite data

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Systematic analysis of interannual and seasonal variations of model-simulated tropospheric NO<sub>2</sub> in Asia and comparison with GOME-satellite data