东亚地区春季一氧化碳的输送特征研究

Characteristics of Carbon Monoxide Transport over East Asia in the Springtime

以ECMWF ERA-40再分析资料构建的气象场为驱动场,利用全球三维大气化学模式MOZART-2,模拟了2001年3月大气污染物浓度的全球时空分布,并以一氧化碳(CO)作为示踪剂分析了春季东亚污染物向西太平洋地区输送的路线和机制。为了检验模拟结果的合理性,对TRACE-P期间典型天气过程下的模拟结果与观测结果进行了比较。比较结果显示,模拟结果可以较好地再现2001年春季冷锋过境期间与东南亚深对流运动加强的天气形势下,东亚污染物向西太平洋地区输送的2大主要路径及其特征:(1)污染物被冷锋系统提升后,在对流层中层向西太平洋快速传输;(2)强烈的大气对流运动可以导致东南亚生物质燃烧产生的污染物在对流层上层向西太平洋输送。

Temporo-spatial distribution of tropospheric trace gases were simulated by using the global Model of Ozone and Related Tracers Version 2 （MOZART-2） driven by reanalyzed ECMWF ERA-40, and transport processes of CO as a tracer were analyzed in order to Study the major outflow pathways and transport mechanisms for export of Asian pollutants in the March of 2001, being characterized by unusually frequent cold surge events in the Asian Pacific rim and strong convection in the southeast Asia. For evaluating the model performance, model results were compared with the observations obtained on the aircraft DC-8 during the TRACE-P mission conducted in the spring of 2001. It is showed that the MOZART-2 generally reproduced the major observed features. （1） The Asian pollution is transported over the Pacific in the middle troposphere after having liftted by Southeastward moving cold fronts; （2） The deep convection can drive the export of biomass burning pollution from the Southeast Asia in the upper troposphere.