Abstract:

 Based on acid rain monitoring data of 11 years in Xifeng climatologicaL station, and main pollutant source data samples in north  of  Qingyang  city,  according to  acid  rain  monitoring  standard  made  by  China  Meteorological  Administration,  acid  rain ChaTaCteTlSt1CS  WPTe  analyzed  StatlStlCally.  ReSLI1tS  S110W  that  aCld  Taln  degree  Weakened  Wlth  f1LICtllatlOn  dLITlng  1992 -2000  In Qlngyang Clty and hOOSted Llp dLITlng 2001-2002  WlthOllt COriSldeTlng 1T1f1LIenCe Of  Wlnd adVPCtlOn, the fTeqLIenCy OCCLITTlng aCld Taln In a year deehned  yearly,  the  monthly  aC1d  Ta1n  degTPe  1S  maXlmlnn  1n  MaTCh  and  t}OVPlnher,  PH V 0.4c},  the  freC(Lleney  OCCLITrlng  aCld Taln 1S maXlmlnn Of 24%-3Jr}10 from ALIgLISt t0  t}OVPlnher.  COriSldeTlng the  1T1f1LIenCe Of  Wlnd adVPCtlOn In OT hefOTe  Taln,  the 1T1f1LIenCe of pollutant source in the north on yearly acid rain intensity isn't obvious, but it can  make the frequency occurring acid rain increase m a year mainly in the influence on acid rain degree is marked in October, PH reduced 0.3, the influence on monthly acid rain summer. The study revealed the fact that acid rain exists over
Longdong loess plateau, it has an active meaning occurrmg 1S to cure acid rain harm and to protect ecology environment.

Key words:  loess plateau, city, acid rain , statistic analysis

摘要：

根据西峰国家基准气候站11a 酸雨监测与庆阳市北部主要污染源资料样木，按照中国气象局确定的酸雨标准统计分析发现:不计风场平流影响条件下,1992-2000年庆阳市酸雨度在波动中减弱，2001-2002年有所增强，年酸雨频率为逐年减弱趋势，月酸雨度3月和11月最强,PH值≤4.80,8-11月酸雨频率最大达24%-35%;在雨前和雨中考虑风场平流因子作用，北部污染源对庆阳市年酸雨度强度平流影响不明撤，对酸雨年频率有增大影响，对月酸雨度影响10月最撤著，PH值减小0.3，在月酸雨频率增大影响上卞要是盛夏6-8月。初步揭示了陇东黄上高原城市存在酸雨的基木事实，对于防治酸雨危害和保护生态环境具有积极意义。

关键词: 黄土高原, 城市, 酸雨, 统计分析