影响上海的一次沙尘过程WRF-Dust数值模拟

利用完全耦合大气化学模式WRF-Dust(Weather Research and Forecasting-Dust)对2011年5月1~4日影响上海地区的一次典型沙尘天气过程进行了数值模拟研究,并与观测资料进行了对比分析.结果表明:WRF-Dust模式成功模拟了此次沙尘过程的形成、发展和演变的整体特征及其影响时间及范围;较好地模拟了沙尘到达上海的时间(模式和观测均在1日11:00前后)和直接影响的结束时间(2日02:00前后),而且模式沙尘浓度与观测资料较为一致;但局部地区和部分时段的气象条件和沙尘模拟还存在一定的偏差,未能准确模拟过程后期沙尘回流对长三角沿海地区的影响.分析了导致模拟偏差的原因,并探讨了提高模式沙尘模拟能力的可能途径.

A modeling study of a dust event using WRF-Dust Model

A fully coupled atmospheric chemistry model, weather research and forecasting (WRF) with dust component (WRF-Dust) was applied to investigate a dust event occurring over Shanghai and surrounding regions during May 1-4, 2011. Through the comparisons with observations, the model was able to capture main features of the event fairlywell. Overall, the simulations showed good agreement with the observations for the starting time (~11:00on May 1), the ending time (~02:00on May 2), and dust peak values of the event around Shanghai. However, some simulation biases were found for several meteorological factors and dust concentrations over several sub-regions during the event. In addition, the model did not reproduce dust backflow over the coastal regions of the Yangtze River Delta. Finally, the possible reasons causing the simulation biases were discussed and methods to improve simulations of dust events were proposed.