摘要
引入雾的集中期和集中度的方法,对江苏省59个地面观测站1961—2007雾的发生频次资料进行了分析研究,得出了近47 a来江苏雾的时空分布特征及其相关统计结果。研究表明,集中度和集中期能够明显地分辨江苏省雾的时空分布非均匀特性。江苏省雾集中度呈现南北高、中间低的特点;集中期在47 a中出现较大波动。采用EOF方法分别对雾日数、集中度和集中期的距平值进行分析,其第一特征向量表现为同相位;其中雾日数的第一时间系数在1980s前后出现峰值,集中度和集中期距平值的第一时间系数表现为先减小后增大的总体趋势。通过气候趋势系数的计算表明苏北地区除4站点外均呈上升趋势。
The fog information of 59 Jiangsu ground-based observation stations from 1961 to 2007 is studied.The fog concentration degree（FCD） and fog concentration period（FCP） of annual fog days in Jiangsu province are selected to analyze the spatial and temporal distribution patterns and variations.Results show that the value is lower in coastal areas than in inland and there are higher values in the north and the south than in the middle of Jiangsu province.FCP shows the significant fluctuation during 47 a.With the Empirical Orthogonal Function（EOF） method,the first eigenvectors of the anomalies of fog days,the FCD and FCP are in phase respectively.The corresponding time coefficients of fog days are higher in 1980s than in other period,and the corresponding time coefficients of both the FCD and FCP are decreasing before 1980 and then increasing subsequently.It is shown that the climatic tendency of fog days at all stations except four in the north of Jiangsu is increasing.
出处
《气象科学》
CSCD
北大核心
2011年第5期632-638,共7页
Journal of the Meteorological Sciences
基金
公益性行业(气象)科研专项(GYHY(QX)2007-6-26)
江苏省自然科学基金(BK2009415)
高校博士点专项科研基金(20093228110002)
2010年江苏省高校自然科学研究重大基础研究项目(10KJA170030)
灾害天气国家重点实验室开放课题(2010LASW-A01)
江苏省气象局北极阁基金(BJG201001)
关键词
雾的集中度
雾的集中期
雾日数
气候趋势
Fog concentration degree
Fog concentration period
Fog days
Climatic tendency
