徐华兵;莫镇廷;杨丰成;单雨才;付东洋;

• 1:广东海洋大学电子与信息工程学院

摘要(Abstract)：

【目的】研究两个连续的热带气旋（tropical cyclones,TC）与中尺度涡共同作用下对阿拉伯海上层环境的影响。【方法】基于遥感、Bio-Argo 浮标数据和 HYCOM 模式数据，探讨 TC 引起的混合、埃克曼抽吸和移速等因素对海表降温和浮游植物变化的影响机制。【结果与结论】TC Chapala(2015 年，4 级，萨菲尔-辛普森飓风等级）过境后，四个中尺度涡区域中降温最明显的区域（平均最大降温幅度达 3 ℃）发生在 TC 移速较慢（≤4 m·s^(-1)）时经过的气旋涡海域。由于第一个超强TC Chapala造成的强烈的混合和海表显著降温，强度弱于TC Chapala的TC Megh(2015年，3 级）很难造成更深的混合，低温水体无法带到表层，抑制了第二次降温，但海表温度缓慢恢复，持续的低温长达两周，远比单个 TC 造成的降温时间长。在两个 TC 作用下，阿拉伯海海表叶绿素 a 浓度增加明显，其中三个气旋涡区域最显著。TC Chapala 较慢经过气旋涡区域，使得该区域平均叶绿素 a 浓度增加到 0.93 mg·m(-1)）时经过的气旋涡海域。由于第一个超强TC Chapala造成的强烈的混合和海表显著降温，强度弱于TC Chapala的TC Megh(2015年，3 级）很难造成更深的混合，低温水体无法带到表层，抑制了第二次降温，但海表温度缓慢恢复，持续的低温长达两周，远比单个 TC 造成的降温时间长。在两个 TC 作用下，阿拉伯海海表叶绿素 a 浓度增加明显，其中三个气旋涡区域最显著。TC Chapala 较慢经过气旋涡区域，使得该区域平均叶绿素 a 浓度增加到 0.93 mg·m^(-3)（原始水平的 4.6倍）。而第二个 TC Megh 过境后，海表叶绿素 a 浓度持续增加，在近岸附近的气旋涡区域平均叶绿素 a 浓度达到 1.48mg·m(-3)（原始水平的 4.6倍）。而第二个 TC Megh 过境后，海表叶绿素 a 浓度持续增加，在近岸附近的气旋涡区域平均叶绿素 a 浓度达到 1.48mg·m^(-3)，浮游植物在 3 周后才恢复到 TC Chapala 过境前水平。虽然两个 TC 强度超过 3 级，但是在反气旋涡区域海表降温和叶绿素 a 浓度变化均不显著，主要原因是反气旋涡造成较厚的混合层和下降流抵消了 TC 引起的混合和上升流作用。此外，Bio-Argo 观测结果显示连续 TC 的过境造成了阿拉伯海低氧区次表层溶解氧的降低。阿拉伯海上层海洋对 TC 的响应，不仅取决于 TC 自身的风速、移速和埃克曼抽吸，也受海洋上层环境的影响，特别是中尺度涡的影响。

关键词(KeyWords)： 连续热带气旋;海表温度;叶绿素a浓度;中尺度涡

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(42106148);; 广东省教育厅青年创新人才项目（2021KQNCX028）;; 广东海洋大学科研启动经费资助项目（R20008）;; 湛江市创新创业团队引育“领航计划”项目（211207157080994）

作者(Authors): 徐华兵;莫镇廷;杨丰成;单雨才;付东洋;

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