古尔班通古特沙漠南缘近40年大雾变化特征分析—蔡家湖区域

利用新疆蔡家湖气象站1971-2010年大雾天气现象观测资料，分析了该地区近40a大雾天气的年际、年代际、日变化特征以及大雾天气的持续时间特征。研究表明：蔡家湖近40a大雾的年日数年际变化不明显；秋季雾日增多趋势明显，春季和冬季雾日呈减少的趋势；大雾主要出现在冬季，其次为秋季；一日中大雾主要发生在02-08时，其次为8-14时；大雾持续时间大多在3h之内；40a雾的最长持续时间为46．88h，出现在2010年11月；各月平均最长持续时间为14．49h，也出现在11月；最长持续时间季节分布呈秋末和冬季较长，夏季较短；大多月份雾的最长持续时间呈增长的趋势；当出现2d及以上的高湿天气，且日平均气温在一7．O～O℃、日最高气温在一6．0～0℃时，有利于雾的持续。

Analysis of the characteristics of heavy fog in the recent 40 years for the Southern Guerbantonggute desert

Adpoting the observation data of foggy weather from 1971 to 2010 of Cai Jia Hu weather station combined statistical method to analyse the variation and duration characteristics of the fog weather in interannual, decadal, monthly, and daily of this area in recent 40 years. Research shows that, the variation of the number of days are not obvious by yearly. The heavy fog occurred mainly in the winter, the second in the fall, and the fog day concentrated mainly in the 02:00 am-08:00 am, followed by 8:00 am-14:00 pm. The fog duration mainly concentrated within 3 hours, and the longest duration of 40a fog is 46.88 hours which happened in November,2011.The longest average monthly fog duration is 14.493 hours which occurred in November too. The distribution of longest fog duration presented that in fall and winter is long, summer is short, the other seasons are in the state. The fog duration of most months shows growing trend. The surface layer is filled with moisture, when temperature decreased slightly, the water will be change into vapor, and humidity is bigger, the more conducive to the formation of fog.