【作者】 茆海云； 张旭晖； 高苹； 孙燕；

【Author】 MAO Haiyun1, ZHANG Xuhui2, GAO Ping2, SUN Yan2 1. Lianyungang Meteorological Bureau, Lianyungang 222006 2. Jiangsu Meteorological Observatory, Nanjing 210008

【机构】 连云港市气象局； 江苏省气象台；

【摘要】 本文应用连云港市6个气象台站1960～2006年气象资料,通过小波分析等统计方法,研究了地表湿润指数的时空分布及变化特征。结果表明:连云港市47a干湿趋势变化不明显,年平均湿润指数存在13～14年的年代际周期和准5年的年际振荡周期,并且都通过了95%的显著性检验,季节平均的湿润指数的周期特征只有夏季与年平均最为相似,其他各季有一定的周期性,但不是十分显著;平均湿润指数在0.97～1.49之间,南北略高,中间略低,平均湿润指数最大值出现在7月,最小值出现在12月;夏季最高,秋季次之,冬季最低;47a冬、夏二季湿润指数是略有上升,秋季则略有下降,春季无升降趋势。更多还原

【Abstract】 Moisture index (MI) in Lianyungang was calculated by meteorological data from 1960 to 2006 of 6 stations. The MI change trend and its spatial and temporal characteristics in Lianyungang were discussed by linear simulation and wavelet analysis methods. Results show that the MI normals (1960-2006) in Lianyungang is 0.97~1.49 and the spatial distribution of it is high in south and north but low in central section, therefore the precipitation of Lianyungang can satisfy the surface evapotranspiration generally. Annual MI in recent 47a has no significant change trend. On the whole, MI in July has the highest value and December the lowest value and its seasonal change feature is summer>autumn>spring>winter. Analysis of the change trends of seasonal MI shows that winter and summer MI have a slight increase trend and autumn a slight decrease trend from 1961 to 2006. Wavelet analysis shows that annual MI has a period of 13-14a and a short period about 5a., and through 95% significance examination. Only the summer average MI and the annual mean are most similar during every season average MI cyclical characteristic, other various seasons have certain periodicity, but are not very remarkable更多还原