Spatial and Temporal Characteristics and Meteorological Conditions for Fog Formation in Anhui Province
Received date: 2011-02-18
Request revised date: 2011-05-10
Online published: 2012-03-20
Copyright
The spatial and temporal characteristics and meteorological conditions for fog formation were analyzed based on the fog data from 80 stations in the period 1971-2005 in Anhui Province. The results show that fogs were concentrated in the Dabie Mountain and the southern Anhui Province. Fog days were of obvious seasonal and inter-monthly variation with wide areas in autumn and winter (maximum), narrow areas in spring and summer (minimum), and most concentrated in October, December and January in most parts of Anhui. Fog usually began at 23:00-08:00 LST and ended at 05:00-12:00 LST (maximum both at 08:00 LST), with duration 1-3 h and maximum 1 h. The yearly variation trend of fog days, different in the spatial distribution, was overall decreasing after increasing in the recent 50 years. Moist air with high relative humidity, weak wind and appropriate temperature benifits the formation of fog.
TAO Yin , WANG Sheng , TIAN Hong , WEN Hua-yang . Spatial and Temporal Characteristics and Meteorological Conditions for Fog Formation in Anhui Province[J]. SCIENTIA GEOGRAPHICA SINICA, 2012 , 32(3) : 374 -379 . DOI: 10.13249/j.cnki.sgs.2012.03.374
Fig.1 The spatial distribution of annual mean number of fog days in Anhui Province图1 安徽省1961~2009年年平均大雾日数的空间分布 |
Table 1 The proportion of fog days with different visibility to total (%) and significance test of the correlation coefficient between fog days and altitude in Anhui Province表1 安徽省不同能见度雾日占总雾日的比例(%)及其与海拔高度的相关系数 |
大雾级别 | 1级大雾 | 2级大雾 | 3级大雾 | 4级大雾 | 总雾日 |
---|---|---|---|---|---|
占总雾日比例(%) | 51 | 35 | 8 | 6 | 100 |
与海拔高度的相关系数 | 0.87** | 0.82** | 0.25* | 0.23* | 0.56** |
注:**表示通过α=0.001的显著性水平检验;*为通过α=0.05的显著性水平检验 |
Fig.2 The seasonal distributions of fog days in Anhui Province图2 安徽省雾日的季节分布 |
Fig.3 Annual number of fog days during 1961-2009 in Anhui Province图3 安徽省1961~2009年雾日历年变化 |
Fig.4 The tendency correlation coefficient distributions of annual mean number of fog days in Anhui Province图4 安徽省年平均雾日趋势系数分布 |
Fig.5 The monthly variation of fog days in Anhui Province图5 安徽省雾日的月际变化 |
Fig.6 The diurnal variation of station-days for the start time and the end time of fog in Anhui Province during 1961-2009图6 1961~2009年安徽省大雾开始时间和结束时间的站日数的日变化 |
Table 2 The duration frequency of fog in Anhui Province (%)表2 安徽省大雾持续时间频率(%) |
0<t≤1 | 1<t≤3 | 3<t≤6 | 6<t≤9 | 9<t≤12 | 12<t≤24 | 24<t |
---|---|---|---|---|---|---|
26.3 | 29.4 | 19.4 | 8.9 | 4.3 | 6.3 | 5.4 |
The authors have declared that no competing interests exist.
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