【作者】 康邵钧； 徐凤梅； 余卫东；

【Author】 Kang Shao-jun,Xu Feng-mei,Yu Wei-dong (Shangqiu weather Bureau, Henan Shangqiu, 476000)

【机构】 商丘市气象局；

【摘要】 依据商丘市所辖8个站1961～2004年雾的观测资料,分析了此区域内大雾天气的分布情况和气候变化特征。结果表明:商丘市雾的地理分布是西部睢县至宁陵一带为多雾区,南部柘城至夏邑一带为少雾区。宁陵出现大雾最多,睢县次之,柘城雾日最少。年际变化总体呈上升趋势。月际变化呈“V”型特征,秋冬季雾最多,夏季最少。雾的日变化一般在下半夜到清晨日出前后形成,早上5～6h最易生成大雾,雾消时间一般在早上6h到中午12h,日出后7～8h雾最容易消散。最长连雾日一般出现在11～1月,而1月出现最长连雾日的次数最多。雾的持续时间3h以下的短雾最多,12～24h最少,没有超过24h的长雾,连雾时间最长为23.3h。从年最多雾日来看,宁陵最多为120d,柘城最少只有32d,其余各站在40～77d之间。另外,以1999～2004年6年天气图资料分析,商丘市雾发生时的地面天气形势主要有以下四种类型:大陆高压型、冷锋前暖区型、均压场型和(低压)倒槽型。更多还原

【Abstract】 By use of data about fog recorded by eight ground observations in Shangqiu from 1961to 2004, the distribution and the climate characteristics of fog in Shangqiu have been analyzed. The results indicate that: Days with fog was more in West sun as Suixian and Ningilng than in South such as Zhecheng and Xiayi. Niling has the most foggy days and Zhecheng has the least. The annual tendency of the foggy days was increasing and the month variety shows the “V” graphic characteristic. Days whit fog present most in Autumn and lest in Summer. The fogs are possibly present in early morning, and less present from noon to evening. The fog is usually at six to twelve in the morning and most possibly present dissipation at seven to eight hours after sunshine. The maintenance of fog was mostly less than 3 hours and there was no fog maintenance more than 24 hours. Based on the data of weather map from 1999 to 2004, the surface synoptic situation can be classified to four styles: continental anticyclone style, warm sectors ahead of cold fronts style, average pressure style, (low pressure) inverted trough style.更多还原