A model tool for assessing real-time mixing of mineral and anthropogenic pollutants in East Asia: a case study of April 2005

[摘要] In order to assess the complex mixing of atmospheric anthropogenic andnatural pollutants over the East Asian region, we present a modelling toolwhich takes into account the main aerosols which are to be foundsimultaneously over China, Korea and Japan during springtime. Using themesoscale RAMS (Regional Atmospheric Modeling System) tool, we present asimulation of natural (desert) dust events along with some of the mostcritical anthropogenic pollutants over East Asia, sulphur elements (SO₂and SO^2-₄) and Black Carbon (BC).

As regards a one-week case study of dust events which occurred during lateApril 2005 over an area extending from the Gobi deserts to the Japansurroundings, we satisfactorily model the behaviours of the differentaerosol plumes. We focus on possible dust mixing with the anthropogenicpollutants from megacities. For both natural and anthropogenic pollution,the model results are in fairly good agreement with the horizontal andvertical distributions of concentrations as measured by in situ LIDAR, and asobserved in remote data, PM₁₀ data and literature. In particular, weshow that a simplified chemistry approach of this complex issue issufficient to model this event, with a real-time step of 3 h. The modelreproduces the main patterns and orders of magnitude for Aerosol OpticalThickness (AOT) and species contributions (via the Angström Exponent)when compared with the AErosol RObotic NETwork (AERONET) data.

[学科分类] 大气科学