摘要
为揭示近年来成都市混合层厚度的变化特征,明晰不同混合层厚度计算方法之间的差异,利用成都市2004~2013年地面常规气象数据及同期探空数据,应用国标法、联合频率法以及干绝热法对该地大气混合层厚度进行计算分析。结果表明：国标法和联合频率法计算得到的混合层厚度年变化特征均呈下降趋势,干绝热法变化趋势平缓;国标法结果显示混合层厚度在夏季最高、冬季最低,联合频率法和干绝热法则是春季最高、秋冬季最低;就日变化而言,国标法的混合层厚度在14时最大、02时最小,此与联合频率法08时混合层厚度值最小不同。3种方法对比得到,国标法计算结果偏低,干绝热法和联合频率法计算精度较高。
In order to reveal the variation characteristics of mixed layer thickness of Chengdu in recent years, and clar- ify differences among different calculation methods of mixed layer thickness, the atmospheric mixed layer thickness is calculated by the national standard method, combined frequency method and dry adiabatic method based on the ground routine weather data and sounding data from 2004 to 2013 in Chengdu. The results show that： （1）The annu- al variation trend of mixed layer thickness calculated by national standard method and combined frequency method re- duce obviously, while the annual variation trend of dry adiabatic method is gentle; （2）The results obtained by nation- al standard method suggest that the thickness of the mixed layer is highest in summer, lowest in winter, while the results of combined frequency method and dry adiabatic method are that the thickness of the mixed layer is highest in spring, lowest in autumn and winter; （3）As for the daily variation, the mixed layer thickness of national standards method is maximum at 14 p. m., minimum at 2 a. m., this is diverse from the combined frequency method with which thickness of the mixed layer is minimal at 8 a. m.. Through comparison of these three methods, the results gained by national standard method are rather lower, while precision calculated by combined frequency method and dry adiabatic method is relatively higher.
出处
《成都信息工程学院学报》
2015年第1期102-105,共4页
Journal of Chengdu University of Information Technology
基金
四川省环境保护重大科技专项资助项目(2013HBZX01)
关键词
大气物理学与大气环境
污染气象
混合层厚度
国标法
联合频率法
干绝热法
对比分析
atmospheric physics and atmospheric environment
pollution meteorology
the thickness of the mixed lay-er
the national standards method
combined frequency method
dry adiabatic method
comparative analysis
