辽宁省大雾演变规律及对气候变暖的响应研究

Study on Heavy Fog Evolving Rule and Its Response to Global Warming in Liaoning Province

利用辽宁省25个代表站1951—2005年的大雾资料,分析了辽宁省大雾雾日异常的空间分布特征、时间演变规律、雾与全球变暖及污染的关系.结果表明:受气候变暖的影响,辽宁省沿海地区大雾日数逐年递增,内陆地区大雾日数逐年递减;空气污染的减轻也是造成沈阳市雾日减少的原因之一;大雾的地域分布呈现“两高三低”的形势,沿海地区的大雾主要出现在4—7月,内陆地区的大雾主要出现在9月—次年1月;全省大雾雾日呈线性增加趋势,增加的趋势比较平稳,呈现以10年左右周期交替变化;在20世纪80年代前,沈阳大雾存在2种变化周期,分别为6-8和15年,80年代后仅存在15年的周期变化.

Based on the observational data of heavy fog at 25 base stations of Liaoning Province from the year 1951 to 2005, the authors analyzed the spatial distribution of daily anomalies, temporal variability and the relationship between flog and global warming. The result shows that due to the global warming, heavy fog over littoral area of Liaoning Province has decreased year by year while the number of fog days in inland area has increased. The lessening of air pollution is also one of the major reasons for the reduction of fog-days in Shenyang. The spatial distribution of heavy fog in Liaoning shows a 2-high and 3-low pattern. In coastal regions of Liaoning, the heavy flog happens in April to July and in the inland area it usually occurs in September to January of the next year. The number of days with heavy flog has increased with a moderate trend and a period around 10 years. The heavy flog in Shenyang has two periodic changes, i.e. 6 - 8 years and 15 years. The 6 - 8 year periodic change weakens after 1980s and the only 15-year period dominates.