Phenomenology of Sahelian convection observed in Niamey during the early monsoon

Phenomenology of Sahelian convection observed in Niamey during the early monsoon
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尼亚美季风早期观测到的萨赫勒对流现象

DOI：
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发表时间：
2014
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通讯作者：
S. Sall
S. Sall
中科院分区：
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文献类型：
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作者：
C. Dione;M. Lothon;D. Badiane;B. Campistron;F. Couvreux;Françoise Guichard;S. Sall

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本研究旨在通过使用非洲季风多学科分析（AMMA）数据集更好地了解萨赫勒地区深对流的启动。本文利用马萨诸塞州理工学院（MIT）的雷达、风廓线仪、卫星资料、地面云图和气象站资料，对季风爆发期间发生在尼亚美上空的大气对流进行了特征分析。从7月6日到31日，雷达反射率场结合亮温被用来对麻省理工学院雷达位置半径50公里范围内每天观测到的对流类型进行分类。艾德确认了四种对流类型：全天晴空万里的晴朗天气（FW）、浅层对流（SH）、午后局部产生的深层对流（LC）和传播的深层对流（PC）。随后，负责启动的机制，当地深对流进行了研究。
This study aims to achieve a better understanding of the initiation of deep convection in the Sahel by using the African Monsoon Multidisciplinary Analyses (AMMA) dataset. Based on the Massachusetts Institute of Technology (MIT) radar, wind profiler, satellite data, surface flux and meteorological stations, we have characterised the atmospheric convection which occurred over Niamey during the onset period of the monsoon. From 6 to 31 July, radar reflectivity fields combined with brightness temperatures were used to classify the type of convection observed each day within a 50 km radius of the MIT radar location. Four types of convection have been identified: fair weather (FW) with a clear sky throughout the entire day, shallow convection (SH), afternoon locally initiated deep convection (LC), and propagating deep convection (PC). Subsequently, the mechanisms responsible for the initiation of local deep convection were investigated.