Abstract:

Vertically Integrated Liquid ( VIL)indicates the total liquid water content in vertical column above the unit bottom area in cloud． It s very important for cloud water resources monitoring，weather warning，operation commanding and effect evaluation of weather modification． Ground clutter doesn t belong to meteorological factors，while it would affect the quality of both the basic data and export products． It has a serious impact on the quantitative application of radar data and must be identified and eliminated． By using radar mosaic VIL products of SWAN from June to August in 2011，an analysis was made on the characteristics of the ground clutter in southwest Hubei，and it was found that the location，size and shape of the ground clutter were relatively fixed． A method of eliminating ground clutter was proposed，firstly，the position index list of the ground clutter was build in southwest Hubei，then eliminating the ground clutter according to the list，finally the blank region after eliminating ground clutter was filled smoothly by recursion interpolation． It found that the method achieved good effects in statistical results for a certain number samples，which made the product more factually represent the horizontal distribution characteristics of VIL．

Key words: SWAN, radar mosaic, VIL;ground clutter

摘要：

利用2011年6～8月的SWAN雷达拼图垂直累计液态含水量(VIL)产品，分析VIL产品中鄂西南地物回波特征，提出直接定位剔除的方法:首先建立鄂西南地物位置索引表，然后根据索引表在VIL拼图产品中剔除地物，最后对剔除地物后的空白区域通过局部递归插值来进行图像平滑处理经过实际资料检验，在一定样本数的统计结果中取得了较好效果，能够更真实地反映VIL水平分布特征。

关键词: SWAN, 雷达拼图, 垂直积分液态水含量, 地物回波