运用墨西哥帽函数(Mexican Hat Function)小波分析方法对锡林浩特地区50年来夏季降水量进行了小波分析。结果表明,夏季降水量在不同时间尺度上的周期变化不同,在较大时间尺度上振荡平缓,在较小时间尺度上振荡剧烈。夏季降水量周期振荡的...运用墨西哥帽函数(Mexican Hat Function)小波分析方法对锡林浩特地区50年来夏季降水量进行了小波分析。结果表明,夏季降水量在不同时间尺度上的周期变化不同,在较大时间尺度上振荡平缓,在较小时间尺度上振荡剧烈。夏季降水量周期振荡的第1~4主周期分别为30年、27年、24年和21年,夏季降水量多少和周期变化对年降水量产生一定影响。该区夏季降水量在30年以上较大时间尺度上存在7~15年的周期变化;在15年时间尺度上存在明显的10年左右的周期变化;在9年时间尺度上存在2~9年的周期变化;在3年以下较小时间尺度上周期振荡明显加强,无稳定周期,降水存在明显的不确定性。降水量的多少是决定草地植被生长状况和营养成分积累及含量的主要原因之一。展开更多
Based on the data of the wind speed from 20 m meteorological tower and PM10 mass concentration in Zhurihe region from January of 2005 to April of 2006,the evolution characteristics of wind speed profile in near surfac...Based on the data of the wind speed from 20 m meteorological tower and PM10 mass concentration in Zhurihe region from January of 2005 to April of 2006,the evolution characteristics of wind speed profile in near surface layer and PM10 in three representative dust weather processes (dust storm,blowing sand and floating dust) were analyzed.The results showed that wind speed was higher during dust storm and blowing sand with remarkable vertical gradient.The speed in floating dust was relatively lower and increased during the whole process.In general,wind speed after dust weather was smaller with respect to that before the event.The average mass concentrations of PM10 in the processes of dust storm,blowing sand and floating dust were in the ranges of 5 436.38-10 000,1 799.49-4 006.06 and 1 765.53 μg/m3,respectively.展开更多
文摘运用墨西哥帽函数(Mexican Hat Function)小波分析方法对锡林浩特地区50年来夏季降水量进行了小波分析。结果表明,夏季降水量在不同时间尺度上的周期变化不同,在较大时间尺度上振荡平缓,在较小时间尺度上振荡剧烈。夏季降水量周期振荡的第1~4主周期分别为30年、27年、24年和21年,夏季降水量多少和周期变化对年降水量产生一定影响。该区夏季降水量在30年以上较大时间尺度上存在7~15年的周期变化;在15年时间尺度上存在明显的10年左右的周期变化;在9年时间尺度上存在2~9年的周期变化;在3年以下较小时间尺度上周期振荡明显加强,无稳定周期,降水存在明显的不确定性。降水量的多少是决定草地植被生长状况和营养成分积累及含量的主要原因之一。
基金Supported by the Scientific Project of Jiangsu Environmental Protection(2009008)The Preliminary Research Projects of Jiangsu "Shier Wu" Environmental Protection Planning
文摘Based on the data of the wind speed from 20 m meteorological tower and PM10 mass concentration in Zhurihe region from January of 2005 to April of 2006,the evolution characteristics of wind speed profile in near surface layer and PM10 in three representative dust weather processes (dust storm,blowing sand and floating dust) were analyzed.The results showed that wind speed was higher during dust storm and blowing sand with remarkable vertical gradient.The speed in floating dust was relatively lower and increased during the whole process.In general,wind speed after dust weather was smaller with respect to that before the event.The average mass concentrations of PM10 in the processes of dust storm,blowing sand and floating dust were in the ranges of 5 436.38-10 000,1 799.49-4 006.06 and 1 765.53 μg/m3,respectively.
