The Characteristic Analysis Of Precipitation And Forecast Of PH Value In Acid Rain In Qingdao

'Acid rain' has been put forward by England chemist R. A. Smith in 'Air and Rain: The Beginnings of a Chemical Climatology'. Acid rain first appeared in industrialization Europe. Nowadays, acid rain appears all over the world. Europe, North America, China are the first, second, third acid rain area respectively.In this paper a brief introduction of current research of acid rain is given. And the data of acid rain from 1994 to 2004 in Qingdao is analyzed. The main researches of this paper are listed below:(1) The precipitation characters from 1994 to 2004 in Qingdao, which includes the chemical components of precipitation, the time distribution of acid rain, and the space distribution of acid rain are analyzed.(2) Based on the multivariate linear regression theory, the regression variables are selected by SAS system, and the multivariate linear regression model is established. Then the mathematical expectation of the pH value is estimated. Based on the AID (Automatic Interaction Detection), a forecast method and the error square sum of forecast are given. Then the mathematical expectation of the pH value is estimated. Using the partial least square regression theory, the partial least square regression equation the error square sum of forecast are given. Then the mathematical expectation of the pH value is estimated.(3) The cause of acid rain in Qingdao is analyzed, and the prevention method is presented.