环渤海低能见度分析及短期预报方法研究-大气科学、气象学专业论文.docxVIP

三种形势占重雾总数的91％。 三种形势占重雾总数的91％。 (6)选取5个具有代表性的站点(锦州，秦争岛，惠民，成山头，大连)建立了 低能见度预报方程，并进行了回代预报检验，结果表明：锦州、秦皇岛、成山头、大连 的拟合准确率分别为；77％、74％、8 1％、82％、77％。 关键词： 低能见度；大雾；天气形势；预报方程 AbstractAtmospheric Abstract Atmospheric visibility refers to the greatest level of target distance that one person with normal vision Can see under certain weather conditions，it is closely related with the cleanliness ofthe atmosphere．Atmospheric visibility in the city to some extent is influenced by the urban construction，industry and the development of transportation．Poor visibility is harm to aviation，marine and urban traffic．Therefore，the study of urban low·visibility will be beneficial to the traffic safety around the city especially on the thruway,as well ills the qualities of people’S lives．Bohai Coastal Region is located in the east of China，with the longitude from 115．50E to 1240E and the latitude from 360N to 41．50N．The range ofBohai Coastal Region covers five provinces or cities，they are Liaoning，Hebei，Beijing，Tianjin，and Shandong．This range is with lower elevation，and based on the plains intertwined with hills to form a more complex terrain mainly．At the same time，Bohai Coastal Region is the important economic developing area with developed industry,convenient transportation and developed thruways．However,with the effect of the Bohai Sea,the climate change in this area shows some specificity,especially the low·visibility caused by the heavy fog．The low-visibility makes important effect in the regional economic development，human living and transportation．Therefore the study on spatial-temporal distribution and forecasting of visibility for BoHai Coastal Region are important to the economic and social development in Bohai Coastal Region． The visibility data of the 25 representative stations from 1 97 1 to 2005 in Bohai Coastal Region are used to analyze the regional climate characteristics including the characteristics of the annual and monthly changes of visibility．The results showed that： 1．V