Structural and Environmental Characteristics of Western Baiu Frontal Depressions
Structural and Environmental Characteristics of Western Baiu Frontal Depressions
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西拜乌锋陷结构与环境特征
DOI：
10.1175/jcli-d-22-0515.1
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发表时间：
2023
影响因子：
4.9
通讯作者：
Yanase Wataru
中科院分区：
文献类型：
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作者：
Tochimoto Eigo;Yanase Wataru
Baiu 锋面凹陷 (BFD) 是沿 Baiu 锋面形成和发展的主要气旋。使用日本 55 年再分析数据集检查 BFD 的结构和环境。自动检测到的 BFD 根据 BFD 峰值区域分为四组：东海 (ES)、日本列岛南岸 (SC)、黄海 (YS) 和日本海 (SJ)。以BFD为中心的综合分析表明，对于YS-BFDs和SJ-BFDs，与ES-BFDs和SC-BFDs相比，上层槽的强度更大，且上层槽更接近，表明上层槽对BFD发展的影响更大。所有类别的 BFD 均位于气旋水平切变区域，并具有从西南到东北的水平槽，有利于正压能量转换。以BFD为中心的能量转换项综合分析表明，环境气旋水平剪切导致的平均动能向涡流动能的正压能量转换有助于BFD的发展，而主要由非绝热加热产生的涡流可用势能的转换是涡流动能的主要贡献者。
Baiu frontal depressions (BFDs) are the major cyclones that form and develop along baiu fronts. The structure and environment of BFDs are examined using the Japanese 55-year Reanalysis dataset. BFDs detected automatically were categorized into four groups based on the region where the BFDs peaked: the East China Sea (ES), off the south coast of the Japanese islands (SC), the Yellow Sea (YS), and the Sea of Japan (SJ). A BFD-centered composite analysis demonstrates that, for YS-BFDs and SJ-BFDs, compared to ES-BFDs and SC-BFDs, the strength of upper-level troughs is greater, and the upper-level troughs are closer, suggesting that the effect of upper-level troughs on BFD development is greater. BFDs for all categories are located in the region of cyclonic horizontal shear and have a horizontal trough running from southwest to northeast, favoring barotropic energy conversion. The BFD-centered composite analysis of the energy conversion terms demonstrates that the barotropic energy conversion of mean kinetic energy due to the environmental cyclonic horizontal shear to eddy kinetic energy contributes to BFD development, and the conversion of eddy available potential energy, which is generated mainly by the diabatic heating, is the major contributor to eddy kinetic energy.