2011年南海夏季风爆发期间大气污染物特征的数值模拟

NUMERICAL SIMULATION OF ATMOSPHERE POLLUTANTS DURING THE ONSET OF SOUTH CHINA SEA SUMMER MONSOON IN 2011

利用2006年Global emissions data和2011年NCEP Final Analysis资料作为WRF-chem3．0模式的初、边值条件，模拟了2011年4月25日-5月25日南海夏季风爆发前后一个月，区域为70～160°E，0～40°N范围内的季风区海盐、PM10、COx、SO2、NOx及O3等各种大气化学污染物的三维空间基本分布情况，结果发现在近地面950hPa和400hPa高度附近，由季风爆发引起的南海地区偏西和偏南风分量加强等风场形势的改变，导致了相应各种污染物浓度在分布上的较大变化，尤其在南海地区，由于出现较强风场辐合导致该地区的污染物浓度明显高于其它区域。还发现在垂直方向上，各种污染物的分布都分别受到了由季风爆发期间引起的偏西和偏南风分量变化的影响较明显。同时，季风爆发前陆地上的污染物浓度明显大于海洋上的污染物浓度，而随着季风爆发，大部分污染物的这种海陆浓度差异会大幅减小。

Using the data of 2006 Global Emissions Data and 2011 NCEP Final Analysis data as the initial and boundary condition, we simulated basic, three-dimensional distribution of the atmospheric chemical pollutants （such as sea salt, PM10, COx, SO2, NOx, O3, etc） during the onset of a South China Sea Summer Monsoon from 25th April to 25th May, 2011 in the area of 70-160°E, 0-40°N. As shown in the simulation results, near the height of 950 and 400 hPa, much change has taken place in the distribution of atmospheric chemical pollutants due to the enhancement of the west and south components of the wind in the South China Sea as a result of the monsoon outbreak. In the South China Sea, the concentration of pollutants is much higher than in other places because there is a strong wind convergence, near the surface. Besides, the vertical distribution of pollutants is also greatly affected by the same components of the wind. Meanwhile, the concentration over land is much greater than at sea before the onset of the monsoon, and with its onset, the difference between land and sea in the concentration of most pollutants decreases greatly.