CUI Yan-xing,LIU Li-ping,HE Jian-xin,et al.Statistical Analysis of South China Summer Cloud Parameters based onCloud Radar,C-band Continuous Wave Radar and Ceilometer Fusion Data[J].Journal of Chengdu University of Information Technology,2018,(03):242-249.[doi:10.16836/j.cnki.jcuit.2018.03.004]
基于云雷达、C波段连续波雷达和激光云高仪融合数据的华南夏季云参数统计分析
- Title:
- Statistical Analysis of South China Summer Cloud Parameters based onCloud Radar,C-band Continuous Wave Radar and Ceilometer Fusion Data
- 文章编号:
- 2096-1618(2018)03-0242-08
- 分类号:
- TN957.51
- 文献标志码:
- A
- 摘要:
- 单独利用云雷达研究云参数,由于降水对毫米波雷达衰减影响,反演误差较大。利用毫米波雷达、C波段连续波雷达和激光云高仪的融合数据,可以减小降水对统计结果的影响,较准确地确定云边界。云相态分类方法将云分为冰云、水云和混合云,利用2016年5-8月的融合数据对广东龙门地区夏季云的云顶和云底高度、云厚、云量、云层数等特征的日变化进行初步统计分析,对不同类型云的宏观特征进行讨论。反演3种云的云内液态水含量,分析含水量的分布特征。研究结果表明:龙门地区云顶高度、云厚、云量、云层数和不同高度上云的发生频次有较明显的日变化特征。广东龙门地区夏季的云顶高度主要集中在4 km以下和8 km以上,5～6 km高度范围内云的发生频次较少。午后出现多层云的频率较高。混合云夏季出现的频率相对最低,水云发生频率相对稳定。冰云发生频率和夏季总云发生频率变化趋势大致相同。夏季水云的积分液态水含量(LWP)相对变化幅度较小,且总LWP和混合云LWP变化趋势基本保持一致,当LWP较高时,混合云为主要贡献。夏季混合云的平均LWP约是水云的2.5倍。
- Abstract:
- Because of the effect of precipitation on the attenuation of millimeter wave radar, the inversion error is larger using cloud radar to study cloud parameters alone. A millimeter-wave radar, C-band continuous wave radar and laser data fusion of Ceilometers, precipitation can reduce the impact of statistical results, and can more accurately determine the boundaries of clouds. Using cloud phase classification method, the cloud was divided into ice cloud, water cloud and hybrid cloud, and the diurnal variation of cloud top and cloud bottom height, cloud thickness, cloud cover, cloud number and other characteristics of summer cloud in Longmen of Guangdong Province. A preliminary statistical analysis was conducted to discuss the macro features of different types of clouds. The cloud water liquid water content of three kinds of clouds was inverted, and the distribution characteristics of water content were analyzed. The results show that the occurrence frequency of cloud top height, cloud thickness, cloud amount, cloud layer and different height in Longmen area has obvious diurnal variation. The cloud tops mainly in this area is mainly concentrated below 4 km and above 8 km, and clouds with the height of 5-6 km are less frequent. There is a higher frequency of multi-layer cloudsafternoon. The frequency of mixed clouds in summer appears to be the lowest, and the frequency of water clouds is relatively stable. The frequency of ice clouds and summer total cloud frequency changes roughly the same. The relative change of liquid water path(LWP)in summer was smaller, and the trend of LWP in total LWP and mixed cloud remained basically the same. When LWP was high, the hybrid cloud was the main contribution.The average LWP of summer hybrid clouds is about 2.5 times the water clouds.
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备注/Memo
收稿日期:2018-03-15基金项目:国家自然科学基金资助项目(41675023)