The genesis of Typhoon Nuri as observed during the Tropical Cyclone Structure 2008 (TCS08) field experiment – Part 2: Observations of the convective environment
The genesis of Typhoon Nuri as observed during the Tropical Cyclone Structure 2008 (TCS08) field experiment – Part 2: Observations of the convective environment
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DOI：
10.5194/acp-12-4001-2012
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发表时间：
2011-08
影响因子：
6.3
通讯作者：
M. Montgomery;Roger K. Smith
中科院分区：
文献类型：
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作者：
M. Montgomery;Roger K. Smith
对2008年热带气旋结构试验期间机载落式风测仪收集的热力学资料进行了分析。尽管先前的工作表明Nuri形成于向西传播的波浪状扰动的保护性再循环“袋”区域内，并暗示旋转的深对流云驱动入流旋转系统尺度流的切向环流，但支持成因的热力学环境的性质仍然是一个争论的话题。在成因阶段，虚拟位温的垂直廓线在某一天的探测之间几乎没有变化，系统平均探测也显示出可以忽略不计的变化。对流层中下部也有变湿的趋势。然而，数据表明，在扰动的再循环区域的尺度上，对流层低层的虚拟温度没有明显的降低，但对流层上层有一个小的变暖（小于1 K）。拟等效位温e的垂直分布表明，在17.5 K至15.2 K之间，从地表到最小位温高度（3 ~ 4 km）之间的垂直方向上，e的亏缺略有减小。这里报告的研究结果与2010年热带地区云系萧条前调查（PREDICT）实验中观察到的发展中扰动的结果一致。一些影响的研究结果进行了讨论。
Analyses of thermodynamic data gathered from airborne dropwindsondes during the Tropical Cyclone Struc- ture (2008) experiment are presented for the disturbance that became Typhoon Nuri. Although previous work has sug- gested that Nuri formed within the protective recirculating "pouch" region of a westward propagating wave-like dis- turbance and implicated rotating deep convective clouds in driving the inflow to spin up the tangential circulation of the system-scale flow, the nature of the thermodynamic environ- ment that supported the genesis remains a topic of debate. During the genesis phase, vertical profiles of virtual po- tential temperature show little variability between soundings on a particular day and the system-average soundings like- wise show a negligible change. There is a tendency also for the lower and middle troposphere to moisten. However, the data show that, on the scale of the recirculating region of the disturbance, there was no noticeable reduction of virtual temperature in the lower troposphere, but a small warming (less than 1 K) in the upper troposphere. Vertical profiles of pseudo-equivalent potential temperature, e, during the gen- esis show a modestly decreasing deficit of e in the vertical between the surface and the height of minimum e (between 3 and 4 km), from 17.5 K to 15.2 K. The findings reported here are consistent with those found for developing disturbances observed in the Pre-Depression Investigation of Cloud Systems in the Tropics (PREDICT) experiment in 2010. Some implications of the findings are discussed.