2012年1月西北太平洋上一个爆发性气旋的云微物理属性垂直结构分析

Vertical Structure of Cloud Microphysical Properties of an Explosive Cyclone over the Northwest Pacific in January,2012

本文利用FNL(Final Analysis)再分析资料、MODIS可见光云图和CloudSat卫星数据,对2012年1月10—13日发生于西北太平洋上的一个爆发性气旋进行了分析,并分析了1月12日02 UTC该爆发性气旋的云微物理属性的垂直结构。结果表明,该爆发性气旋中心附近的云为深厚宽广的深对流云,云系向上伸展到9 km左右的高空。云中冰粒子有效半径大小随高度增加而减小,其大值集中在冰云下部。而冰粒子数浓度随高度增加而增加,其大值集中在冰云上部。云中冰水含量随高度变化不明显,其大值集中在云的中下部。冰粒子有效半径、冰粒子数浓度和冰水含量大值区在气旋中心南侧的高度比北侧更高,气温高值区和比湿大值区也集中于气旋中心南侧,这可能与冷暖空气的空间配置及气旋中心南侧有更显著的潜热释放有关。据此可以推测,云系在气旋中心南北侧有明显差异可能与云的不同发展机制有关。

In this paper,by using the FNL(Final Analysis)reanalysis data of NCEP(National Center for Environmental Prediction)and CloudSat satellite data provided by CloudSat Data Processing Laboratory,an explosive cyclone over the Northwestern Pacific from 10 to 13 January 2012 was analyzed.Also the vertical structure of cloud microphysical properties of this explosive cyclone around 02 UTC 12 January 2012 was documented.The analyzed results showed that the clouds near the explosive cyclone center were deep and convective clouds,which extended upward to near 9 km in altitude.The effective radius of ice particles within clouds decreased with the altitude increasing,and its maximum value was concentrated in the lower-part of the clouds.While the concentration of ice particles within clouds increased with the altitude increasing,and its maximum value was concentrated in the upper-part of the clouds.The ice water content variation within clouds associated with the altitude was not obvious,and its large values were concentrated in the mid-and lower-part of the clouds.The position of maximum effective radius,number concentration and water content of ice particles in southern side was higher than that of northern side of cyclone center.The high-temperature region and the large-specific humidity region were also concentrated in the southern side of the cyclone center,which might be related to the spatial distribution of warm and cold air,as well as the more significant latent heat release in the southern side of the cyclone center.Thus,it was inferred that there were obvious differences in cloud systems between the northern and southern sides of cyclone center,which may be related to different cloud development mechanisms.