transport of pollutant meaning in Chinese
污染物迁移
Examples
- Spatial distribution and time scales of atmospheric diffusion over beijing area are revealed by means of a random walk simulation model and practical meteorological data with a specified emission source from the city . results show a southward transport pattern for wintertime while a northwest transport of pollutants in summer . the area is the least evidently influenced by the emission source in spring , while the largest in autumn . the time spent for instantly emitted material removing from the model domain varies from winter - spring to summer - autumn . the former was shorter one of less than 20 hours ; the latter was longer one of approximately 30 hours . distribution of occurrence probability for different removal times was not symmetry . reducing slowly at the end of longer removal time , probability exists for pollutants remaining in this area a long time
结果表明，冬季示踪物偏南夏季偏西北的输送明显春季扩散影响范围最小秋季最大。示踪物从200km200km模式区域输出的平均时间去除时间明显分为冬春季和夏秋季两组，前者较小，平均在20h以下，后者较大，平均约30h 。不同去除时间出现的频率分布是非对称的，在长去除时间一侧，出现频率下降缓慢，显示污染物有在该区域内长时间滞留的可能。 - The long distance transport of pollutant from the direction of se , ene and etc , has some influences to the variation of surface o3 over waliguan , due to the short life of precursors , and the long distance between two sites as well as the weak photochemical reaction over this area , the influence of wind direction is not so important
( 7 )在se 、 ene等东北方向上污染物( no _ x等)的长距离水平输送对瓦里关地面o _ 3具有一定的影响。但由于o _ 3前提物在大气中的寿命较短，两地又相距较远，而且瓦里关地区光化学反应很弱。因此，水平风向对地面o _ 3影响不大。