福建低温阴雨时空分布及异常偏多成因分析  

Spatial and Temporal Distribution of Cold and Rainy Weather in Fujian Province and its Anomalous Abundant Causes

作　　者：江晓南[1] 陈玉吉 朱艳萍[1] 卢伟萍[3] 

机构地区：[1]福建省气象台,福建福州350001 [2]福建省气象服务中心,福建福州350001 [3]广西气象减灾研究所,广西南宁530022

出　　处：《气象研究与应用》2012年第1期16-20,共5页Journal of Meteorological Research and Application

摘　　要：选取1960～2010年福建春播期平均气温资料、日照资料、NCAR/NCEP逐日高度场、风场及逐月海温资料,使用统计方法分析近51a来福建省北部和南部低温阴雨日数的时空分布及异常偏多成因。结果表明:福建省低温阴雨日数的空间分布与福建省的地形及纬度密切相关。近51a来福建低温阴雨日数呈弱减少趋势,福建北部和南部地区年际变化特征相似。未来一段时间福建北部地区低温阴雨日数偏多可能性较大,南部地区低温阴雨日数可能继续偏少。福建低温阴雨日数与乌拉尔山脊强弱、亚洲高纬地区经向环流强弱关系密切。亚洲高纬地区的环流经向度偏强,冷空气不断南下和较强的西南风配合,湿度条件较好,是造成福建低温阴雨日数明显偏多的直接原因。福建北部地区低温阴雨异常偏多年前冬北太平洋(55°N～60°N,155°W～180°W)区域海温明显偏暖;福建南部地区低温阴雨异常偏多年前冬太平洋中东部海域海温明显偏暖。Basing the observational data of daily averaged temperatures,sunshine,and such NCEP/NCAR reanalysis data as monthly sea surface temperature（SST）,daily geo-potential height and wind,from1960-2010 in Fujian province,using statistics method,the spatial and temporal distribution and the anomalous abundant causes of cold and rainy weather during spring sowing period（NDCRWS） in Northern and Southern Fujian were analyzed.The results show that the spatial distribution of the NDCRWS is closely related to the terrain and latitude of Fujian.The NDCRWS has a weak decreasing tendency in the past 51 years.The interannual variation of NDCRWS in the Northern Fujian is similar to that in the Southern Fujian.The NDCRWS in Northern（Southern）Fujian still has an increase（decrease）trend in coming years.The anomalous abundant of NDCRWS are directly caused by the strong meridional circulation in high latitude area of Asia,active cold air,southwesterly wind and abundant humidity.The SST in the North（central and eastern）Pacific during the preceding winter is obviously higher than normal while there are the anomalous abundant NDCRWS in the Northern（Southern）Fujian.

关 键 词：春播期 低温阴雨 时空分布 异常偏多 海温 

分 类 号：P46[天文地球—大气科学及气象学]