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Terada, Hiroaki; Ueda, Hiromasa*; Wang, Z.*
Atmospheric Environment, 36(3), p.503 - 509, 2002/01
Times Cited Count：51 Percentile：70.31(Environmental Sciences)Acid rain and its neutralization by yellow-sand in East Asia was investigated numerically by an Air Quality Prediction Modeling System (AQPMS). AQPMS consists of advection, diffusion, dry and wet deposition, gas- and liquid-phase chemistry. A new deflation module of the yellow-sand was designed to provide explicit information on the dust loading, and linked to the AQPMS. For model validation, the predicted pH values and sulfate- and nitrate-ion levels of precipitation, together with the surface concentrations of gaseous pollutants, were compared with measured values at atmospheric monitoring stations, and a reasonable agreement was obtained. Firstly, trend of the acid rain in East Asia due to the rapid increase of Chinese pollutants emission was investigated, and a remarkably rapid increase of acid rain area was predicted in the period from 1985 to 1995. Secondly, the simulation results of April 1995 exhibited a strong neutralization of the precipitation by the yellow-sand.
Terada, Hiroaki; Ueda, Hiromasa*; Wang, Z.*
Proceedings of 7th International Joint Seminar on the Regional Deposition Processes in the Atmosphere, p.115 - 122, 2001/11
The neutralization of acid rain by yellow-sand in East Asia was investigated numerically by an Air Quality Prediction Modeling System (AQPMS). AQPMS consists of advection, diffusion, dry and wet deposition, gas-phase chemistry and the liquid-phase chemistry. Different from the previous ones for Sahara and Australian deserts, a new deflation module of the yellow-sand was designed here, and this module was linked to the AQPMS. Firstly, for model validation, predicted various values were compared with measured values at atmospheric monitoring stations, and a reasonable agreement was obtained for April 1995. Secondly, a sensitivity experiment about chemical effects of yellow-sand was made and the result of it exhibited a strong neutralization of the precipitation by the yellow-sand. The monthly mean pH values in the northern China showed a remarkable increase of 0.6-1.8 by neutralization effect of the yellow-sand, while the increases in the southern China were less than 0.1. Even in Korea and Japan the yellow-sand caused the increase of the pH value of rain by 0.1-0.2.
