• CN 62-1175/P
• ISSN 1006-7639
• 双月刊
• 中国科技核心期刊
• 中国学术期刊综合评价数据库统计源期刊
• 中文科技期刊数据库收录期刊

• 论文 •

### 宁夏雾日和霾日的变化趋势分析

1. 宁夏气象防灾减灾重点实验室，宁夏 银川 750002
• 出版日期:2013-12-14 发布日期:2013-12-14
• 作者简介:张智(1967 － )，男，高级工程师，主要从事气候分析工作． E － mail:zz_tt@126． com
• 基金资助:

科技部公益性行业(气象)科研专项(GYHY201306027)资助

### Tendency Analysis of Fog Days and Haze Days in Ningxia

1. Key Laboratory of Meteorological Disaster Preventing and Reducing in Ningxia，Yinchuan 750002，China
• Online:2013-12-14 Published:2013-12-14

Abstract:

Based on the daily fog days，haze days，visibility and humidity data at 22 observational stations from 1961 to 2012 in Ningx-
ia，the spatial distribution and variation trends of the fog days and haze days were analyzed by using the climatic inclination rate，maxi-
mum entropy spectrum technique and Mann － Kendall test． The results show that the spatial distribution of the annual mean fog days in
Ningxia presented an asymmetry saddle． The fog days in the southern and northern region were more than that in the middle region．
The spatial distribution of the annual mean haze days was similar to the fog days，but the haze days in the northern region were slightly
more than that in the southern region． In recent 52 years，the fog days presented decline trend in the southern region and increase trend
in the northern and middle region，but the haze days showed a significant increase trend in all regions． Moreover，both the fog days and
the haze days existed obvious change in phase． They were significantly less from 1961 to 1980，fluctuated during 1981 －2000，but be-
came obviously more after 2001． There were obvious quasi － period oscillation for the fog days and the haze days． Among，the former
were 7． 5 and 4． 3 years，while the latter were 4． 6 and 3． 0 years． Neither the fog days nor the haze days had occurred mutation．

﻿