Model study on acidifying wet deposition in East Asia during wintertime

Han, Zhiwei; Ueda, Hiromasa; Sakurai, Tatsuya

doi:10.1016/j.atmosenv.2005.12.017

Cited by 40 publications

(25 citation statements)

References 46 publications

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“…It represents a series of major processes of chemical components in the troposphere, such as advection, diffusion, dry deposition, cloud and scavenging, gas and aqueous chemistry etc. and has been applied to study a number of environmental problems regarding ozone, acid deposition and soil dust transport [6][7][8]. Gas phase chemistry is represented by an updated version of CB-IV mechanism [5] which includes 37 species and 91 reactions and employs a modified QSSA (quasi-steady-state assumptions) technique to solve the chemical equations.…”

Section: Numerical Experiments and Optionsmentioning

confidence: 99%

Sensitivity of air quality model prediction to parameterization of vertical eddy diffusivity

Han

Zhang

2008

Environ Fluid Mech

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This paper investigates the effects of vertical eddy diffusivities derived from the 3 different planetary boundary layer (PBL) schemes on predictions of chemical components in the troposphere of East Asia. Three PBL schemes were incorporated into a regional air quality model (RAQM) to represent vertical mixing process and sensitivity simulations were conducted with the three schemes while other options are identical. At altitudes <2 km, all schemes exhibit similar skill for predicting SO 2 and O 3 , but more difference in the predicted NO x concentration. The Gayno-Seaman scheme produces the smallest vertical eddy diffusivity (Kz) among all schemes, leading to higher SO 2 and NO x concentrations near the surface than that from the other 2 schemes. However, the effect of vertical mixing on O 3 concentration is complex and varies spatially due to chemistry. The Gayno-Seaman scheme predicts lower O 3 concentrations than the other two schemes in the parts of northern China (generally VOC-limited) and higher ones in most parts of southern China (NO x -limited). The Byun and Dennis scheme produces the largest mixing depth in the daytime, which bring more NO x into upper levels, and the mixing depth predicted by the Gayno-Seaman scheme is the smallest, leading to higher NO x and lower O 3 concentrations near the surface over intensive emission regions.

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Section: Numerical Experiments and Optionsmentioning

confidence: 99%

Sensitivity of air quality model prediction to parameterization of vertical eddy diffusivity

Han

Zhang

2008

Environ Fluid Mech

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“…The model could reproduce monthly NO − 3 concentrations in rainwater , hourly SO 2 and monthly nss-SO 2− 4 concentrations in rainwater affected by the Miyakejima Volcano Kajino et al, 2004), PM 2.5 , PM 10 , and the aerosol size distribution during dust events (Han et al, 2004) (Han et al, 2006), O 3 relevant trace species such as NO x and VOCs measured for the TRACE-P project (Han, 2007), and all of those species along with a model inter-comparison study for MICS-Asia Phase II Han et al, 2008 and references therein). Table 2 summarizes statistical analyses for comparisons between daily and monthly observations and simulation data at the six EANET remote monitoring stations depicted in Fig.…”

Section: Model Evaluation Using the Eanet Monitoring Datamentioning

confidence: 99%

“…For sulfate, the dry deposition velocity is parameterized according to the work of Walcek et al (1986). Gas phase chemistry can be represented by either a condensed mechanism developed (He and Huang, 1996;An et al, 2002;Han et al, 2006) on the basis of Atkinson et al (1982) or a complete version of the CB-IV mechanism (Gery et al, 1989), with an updated isoprene mechanism. The model ISSOROPIA1.7 (http://nenes.eas.gatech.…”

Section: Off-line Coupled Meteorology-chemical Transport Model Systemmentioning

confidence: 99%

Spatial distribution of the source-receptor relationship of sulfur in Northeast Asia

et al. 2011

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Abstract. The spatial distribution of the source-receptor relationship (SRR) of sulfur over Northeast Asia was examined using a chemical transport model (RAQM) off-line coupled with a meteorological model (MM5). The simulation was conducted for the entire year of 2002. The results were evaluated using monitoring data for six remote stations of the Acid Deposition Monitoring Network in East Asia (EANET). The modeled SO 2 and O 3 concentrations agreed well with the observations quantitatively. The modeled aerosol and wet deposition fluxes of SO 2− 4 were underestimated by 30 % and 50 %, respectively. The domain was divided into 5 source-receptor regions: (I) North China; (II) Central China; (III) South China; (IV) South Korea; and (V) Japan. The sulfur deposition in each receptor region amounted to about 50-75 % of the emissions from the same region. The largest contribution to the deposition in each region was originated from the same region, accounting for 53-84 %. The second largest contribution was due to Region II, supplying 14-43 %. The spatial distributions of the SRRs revealed that subregional values varied by about two times more than regional averages due to nonuniformity across the deposition fields. Examining the spatial distributions of the deposition fields was important for identifying subregional areas where the deposition was highest within a receptor region. The horizontal distribution changed substantially according to season.

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“…The Regional Air Quality Model (RAQM) was developed at the Acid Deposition and Oxidant Research Center (currently named the Asia Center for Air Pollution Research), which focuses on such Asian air quality problems Han, 2007). The model has been used for various air pollution studies in Asia, such as studies of high oxidant, massive dust transport and volcanic sulfur episodes, and substantial modifications have been made upon comparing and evaluating with extensive long-term monitoring data Han, 2007;Han et al, 2004Han et al, , 2005Han et al, , 2006Kajino et al, 2004Kajino et al, , 2005 and with other models (Carmichael et al, 2008 and references therein). However, an aerosol dynamics module was not implemented in RAQM, and thermodynamic equilibrium was assumed for the gasaerosol partitioning of semi-volatile inorganic components, such as sulfate, nitrate and ammonium.…”

Section: Introductionmentioning

confidence: 99%

Development of the RAQM2 aerosol chemical transport model and predictions of the Northeast Asian aerosol mass, size, chemistry, and mixing type

et al. 2012

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Abstract.A new aerosol chemical transport model, the Regional Air Quality Model 2 (RAQM2), was developed to simulate the Asian air quality. We implemented a simple version of a triple-moment modal aerosol dynamics model (MADMS) and achieved a completely dynamic (nonequilibrium) solution of a gas-to-particle mass transfer over a wide range of aerosol diameters from 1 nm to super-µm. To consider a variety of atmospheric aerosol properties, a category approach was utilized in which the aerosols were distributed into four categories: particles in the Aitken mode (ATK), soot-free particles in the accumulation mode (ACM), soot aggregates (AGR), and particles in the coarse mode (COR). The aerosol size distribution in each category is characterized by a single mode. The condensation, evaporation, and Brownian coagulations for each mode were solved dynamically. A regional-scale simulation ( x = 60 km) was performed for the entire year of 2006 covering the Northeast Asian region. The modeled PM 1 /bulk ratios of the chemical components were consistent with observations, indicating that the simulated aerosol mixing types were consistent with those in nature. The non-sea-salt SO 2− 4 mixed with ATK + ACM was the largest at Hedo in summer, whereas the SO 2− 4 was substantially mixed with AGR in the cold seasons.Ninety-eight percent of the modeled NO − 3 was mixed with sea salt at Hedo, whereas 53.7 % of the NO − 3 was mixed with sea salt at Gosan, which is located upwind toward the Asian continent. The condensation of HNO 3 onto sea salt particles during transport over the ocean accounts for the difference in the NO − 3 mixing type at the two sites. Because the aerosol mixing type alters the optical properties and cloud condensation nuclei activity, its accurate prediction and evaluation are indispensable for aerosol-cloud-radiation interaction studies.

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Model study on acidifying wet deposition in East Asia during wintertime

Cited by 40 publications

References 46 publications

Sensitivity of air quality model prediction to parameterization of vertical eddy diffusivity

Sensitivity of air quality model prediction to parameterization of vertical eddy diffusivity

Spatial distribution of the source-receptor relationship of sulfur in Northeast Asia

Development of the RAQM2 aerosol chemical transport model and predictions of the Northeast Asian aerosol mass, size, chemistry, and mixing type

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