Emission heights of narrow bipolar events in a tropical storm over the Malacca Strait

2017 International Conference on Electrical Engineering and Computer Science (ICECOS) Pub Date : 2017-08-01 DOI:10.1109/ICECOS.2017.8167155

M. Ahmad, D. Periannan, M. Sabri, M. Aziz, G. Lu, Hongbo Zhang, Mona Riza Mohd Esa, V. Cooray

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引用次数: 6

Abstract

Emission heights for narrow bipolar events (NBEs) have been reported mostly from observations at mid latitudes but none have been reported from tropical regions. In this paper, we are reporting for the first time the heights of NBE emissions from a tropical storm over the Malacca Strait, a narrow water passage between the Malay Peninsula and Sumatra Island. A total of 49 positive NBEs (+NBEs) were detected from the storm. The NBE activity can be divided into two stages according to the emission heights and radar reflectivity data. The first stage (or S1) lasted for only 6 minutes, started with the first detected NBE, and produced 20 NBEs (41%). The emission heights ranged between 12.0 and 16.7 km. Radar reflectivity data showed that the storm reached maximum values at 55 dBZ within the period S1. In contrast, the second stage (S2) lasted longer (32 minutes) and produced 29 NBEs (59%). The emission heights were lower and ranged from 8.5 to 13.7 km. Radar reflectivity data showed that the storm reached maximum values at 50 dBZ within the period S2.

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马六甲海峡热带风暴中狭窄双极事件的发射高度

窄双极事件(NBEs)的发射高度大多来自中纬度地区的观测，但没有热带地区的报道。在本文中，我们首次报道了马六甲海峡(马来半岛和苏门答腊岛之间的狭窄水道)上空热带风暴的NBE排放高度。本次风暴共探测到49个正态(+态)边界层。根据发射高度和雷达反射率数据，NBE活动可分为两个阶段。第一阶段(S1)仅持续6分钟，从第一次检测到NBE开始，产生20个NBE(41%)。排放高度在12.0 ~ 16.7 km之间。雷达反射率资料显示，在S1期间，风暴在55 dBZ处达到最大值。相比之下，第二阶段(S2)持续时间更长(32分钟)，产生29个nbe(59%)。排放高度较低，在8.5 ~ 13.7 km之间。雷达反射率资料显示，在S2时段，风暴在50 dBZ处达到最大值。

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2017 International Conference on Electrical Engineering and Computer Science (ICECOS)

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