Evolution of Mesoscale Convective System Properties as Derived from Himawari-8 High Resolution Data Analyses
Evolution of Mesoscale Convective System Properties as Derived from Himawari-8 High Resolution Data Analyses
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DOI：
10.2151/jmsj.2018-020
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发表时间：
2018-01
影响因子：
3.1
通讯作者：
Nurfiena Sagita Putri;H. Iwabuchi;T. Hayasaka
中科院分区：
文献类型：
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作者：
Nurfiena Sagita Putri;H. Iwabuchi;T. Hayasaka
采用改进的“Grab ' em Tag ' em Graph ' em”（GTG）跟踪算法和集成云分析系统（ICAS）算法对Himawari-8 AHI红外数据进行了印度尼西亚地区中尺度对流系统（MCS）的两个案例研究。爪哇岛上空的第一个案例显示，北冬出现了陆源MCS，与海洋大陆上空的麦登-朱利安涛动（MJO）湿期相吻合。第二种情况显示了北纬夏季强垂直风切变影响下MCS的演变。第一种情况下深层对流部分的云顶高度（CTH）大于第二种情况，而CTH的时间演变在两种情况下相似。对于铁砧部分，第二个病例的中位CTH相对稳定在13 km左右，而第一个病例的中位CTH在14 ~ 16 km之间表现出较大的时间变化。两种情况下，顶柱的云粒子有效半径（CER）在最大深度对流CTH期后均有所增加，但后者的CER略大于前者。两种情况下云性质的差异可归因于背景风廓线。
Two case studies of the mesoscale convective system (MCS) in the Indonesian region were conducted by applying an improved “Grab ‘em Tag ‘em Graph ‘em” (GTG) tracking algorithm and the Integrated Cloud Analysis System (ICAS) algorithm to Himawari-8 AHI infrared data. The first case over Java Island showed a land-origi nating MCS in the boreal winter, which coincided with a wet phase of Madden-Julian Oscillation (MJO) over the Maritime Continent. The second case showed the evolution of MCS under the influence of a strong vertical wind shear during the boreal summer. The cloud top height (CTH) of deep convective part in the first case was larger than that in the second case, while the temporal evolution of CTH was similar between the two cases. For the anvil part, the median CTH of the second case was relatively stable at around 13 km, while that of the first case showed a considerable temporal variation ranging from 14 to 16 km. The cloud-particle effective radius (CER) of the anvil increased after the period of maximum deep convective CTH in both cases, although the CER was slightly larger in the second case than in the first case. These differences in cloud properties between the two cases were attributable to the background wind profiles.