亚洲大陆2000～2002年春季大气沙尘时空特征的数值模拟

将矿物沙尘释放与沉降模式和全球大气化学传输模式相耦合,建立了一个能够完整描述沙尘的扬起、输送和沉降动态过程的模式系统,并利用实时气象资料强迫该模式,对2000、2001和2002年春季(3～5月)亚洲大气沙尘时空特征进行了数值模拟研究.结果表明,模拟的3年春季平均大气柱沙尘浓度分布与地面观测的3年春季平均沙尘暴频率分布范围基本吻合,模拟的沙尘气溶胶光学厚度与卫星观测的气溶胶指数具有显著的相关性,验证了该模式对亚洲沙尘的扬起、传输和沉降过程及大气沙尘载荷时空特征有较好的模拟能力,并基于模拟的沙尘释放通量与沙尘气溶胶光学厚度的相关分析,探讨了亚洲沙尘可能的传输路径.

Numerical Simulations of Spatial and Temporal Characteristics of Airborne Dust over Asia During Springs of 2000 to 2002

Spatial and temporal characteristics of airborne dust over Asia during springs of 2000,2001 and 2002 were simulated with a mineral dust entrainment and deposition model(DEAD) embedded in a global model of atmospheric transport and chemistry(MATCH) using the real-time meteorological data as forcing fields. The results show a good agreement of the pattern of model-simulated atmospheric dust concentration with the distribution of surface-observed spring dust storm frequency and a significant correlation between the simulated dust aerosol optical depth(DAOD) and satellite-observed aerosol index(AI).These results validate applicability of the integrated model in simulating dust entrainment,transportation and deposition and describing spatial and temporal characteristics of dust loading over the Asian continent.In addition,an attempt was made to explore possible paths of dust transportation by use of correlation analyses between the simulated dust emission flux(DEF) and DAOD.