摘要
利用一次冷空气过程的14组GPS探空数据,采用位温梯度法确定了冷空气过境前后大气边界层高度,并分析了冷空气过程对大气边界层结构的影响。结果表明:冷锋过境加大了海洋大气边界层的静力不稳定度,使边界层内对流活动增强,且锋面过后距离锋面越近的区域边界层的静力不稳定度越大;冷锋过境使边界层的平均高度升高,边界层顶处逆温梯度增大。结合ERAInterim再分析资料,分析认为大气边界层高度与静力稳定度(海气温差)存在显著的正相关关系(相关系数达0.73),海气温差越大,大气边界层高度越高。
Using 14 sets of GPS sounding data of a cold air process,the height of atmospheric boundary layer before and after the cold air transit is determined by the potential temperature gradient method,and the impact of cold air process on the structure of atmospheric boundary layer is also analyzed.Results show that the cold front transit increases the static instability of marine atmospheric boundary layer,enhances the convective activity in the boundary layer,and the greater the static instability of the boundary layer in the area closer to the front after front transit.The cold front transit makes the mean height of the boundary layer increase,and the gradient of temperature inversion at the top of the boundary layer increase.Combined with the ERA-Interim reanalysis data,it is concluded that there is a significant positive correlation between the height of atmospheric boundary layer and the static stability（ sea-air temperature difference）,and the correlation coefficient is 0. 73. The higher the sea-air temperature difference,the higher the height of atmospheric boundary layer.
出处
《海洋气象学报》
2018年第1期51-61,共11页
Journal of Marine Meteorology
基金
国家重点基础研究发展计划(973计划)项目(2015CB953903)
关键词
冷锋
GPS探空
海洋大气边界层
边界层高度
大气稳定度
cold front
GPS sounding
marine atmospheric boundary layer
boundary layer height
atmospheric stability
