| 摘要: |
| 利用1981-2020年安顺市6个国家气象站的逐日能见度资料和同期地面逐小时降水资料，运用统计分析、Morlet小波分析、Mann-Kendall非参数统计检验以及Pettitt突变检验，对安顺市大雾天气的气候特征进行分析，结果表明：1981-2020年安顺市总共出现大雾1111d，年平均大雾日数为27.8d；大雾日数的季节变化呈冬季＞春季(秋季)＞夏季，其中冬季大雾出现的频率占全年的44%；大雾主要出现在1月，其出现的频率占全年的18%，其次是2月和12月。近40年安顺市出现大雾最多的站点是西秀区，其次是关岭县；夏季大雾的高发区是紫云县，西秀区是大雾的低发区，春、秋、冬三季，大雾的高发区是关岭县和西秀区。安顺市大雾日数存在明显的准5a、准12a和准20a的周期震荡，其中准20a为第一主周期，具有明显的稳定性和全域性。1981-1996年期间安顺市的大雾日数总体呈减少趋势，且1986-1990年期间减少趋势显著；1996年以后安顺市大雾日数总体呈增加趋势，且2004年以后增加趋势显著；安顺市大雾日数在2003年发生突变，且突变特征显著，突变后的大雾日数较突变前增加了157%。 |
| 关键词: 大雾、Morlet小波分析、Mann-Kendall非参数统计检验、Pettitt突变检验 |
| DOI： |
| 投稿时间：2022-03-11修订日期：2022-05-11 |
| 基金项目: |
|
| Analysis of climatic characteristics of heavy fog weather in Anshun from 1981 to 2020 |
| zengni |
| (Anshun Meteorological Bureau of Guizhou Province) |
| Abstract: |
| Based on the daily visibility data and hourly precipitation data of six national weather stations in Anshun during 1981-2020, statistical analysis, Morlet wavelet analysis，Mann-Kendall nonparametric statistical test and Pettitt mutation test were used to analyze the climatic characteristics of heavy fog in Anshun. The results show that:From 1981 to 2020, a total of 1111 days of fog occurred in Anshun, and the annual average number of foggy days was 27.8 days.The seasonal variation of foggy days was winter > spring (autumn) > summer, and the frequency of foggy days in winter accounted for 44% of the whole year.Fog mainly occurs in January, accounting for 18% of the year, followed by February and December.In recent 40 years, xixiu district has the most fog in Anshun city, followed by Guanling County.Ziyun county has a high incidence of fog in summer, xixiu district has a low incidence of fog, and Guanling County and Xixiu district have a high incidence of fog in spring, autumn and winter.The foggy days in Anshun have obvious periodic oscillations of quasi-5a, quasi-12A and quasi-20A, of which quasi-20A is the first main period with obvious stability and regionality.The number of foggy days in Anshun decreased from 1981 to 1996, and decreased significantly from 1986 to 1990.The number of foggy days in Anshun increased after 1996, and increased significantly after 2004.The number of foggy days in Anshun city changed significantly in 2003, and the number of foggy days after the mutation increased by 157% compared with that before the mutation. |
| Key words: Fog, Morlet wavelet analysis, Mann Kendall nonparametric statistical test, Pettitt mutation test |
