北部湾叶绿素a浓度时空变化及影响因素Analysis of Spatiotemporal Variation in the Chlorophyll-a Concentration in Beibu Gulf
刘思萌,李君益,叶小敏,谢玲玲,曾飞鸿
摘要(Abstract)：
【目的】研究北部湾表层叶绿素a质量浓度的时空分布及其影响因子，为北部湾初级生产力评估及深远海养殖提供依据。【方法】基于2003-2020年逐月卫星遥感叶绿素a质量浓度、海表面温度（SST）、降雨数据以及再分析风场数据，利用经验正交分解（EOF）、小波相干等方法分析SST、降雨、风等环境因子对北部湾叶绿素a质量浓度的影响。【结果与结论】北部湾叶绿素a质量浓度呈近岸高、中央低的空间分布规律。年际变化特征明显，2016年为浓度峰值年，平均质量浓度为1.6 mg·m~(-3),2010年质量浓度最低，仅为1.1 mg·m~(-3)。在季节变化方面，北部湾区域平均叶绿素a质量浓度冬季最高，春季浓度最低，涠洲岛南侧海域平均叶绿素a质量浓度冬季最高，夏季节最低。红河河口区域夏、秋叶绿素a质量浓度高于春、冬叶绿素a质量浓度。长山山脉东侧区域平均叶绿素a质量浓度在秋季最高，在春季最低。月变化方面，北部湾叶绿素a质量浓度在5月最低，12月最高。海表面温度、降雨和风是影响北部湾叶绿素a质量浓度时空分布的主要因素。在北部湾的中、东海域，海表面温度与叶绿素a质量浓度显著负相关（P <0.05,r <-0.8）。降雨的影响主要集中在湾西部，降雨增加的径流量提供更多营养物质，使红河河口区域夏、秋季叶绿素a质量浓度较高，长山山脉东岸区域叶绿素a质量浓度在秋季达到峰值。风速与北部湾叶绿素a质量浓度显著正相关（P <0.01,r=0.4）。
关键词(KeyWords)： 北部湾;叶绿素a质量浓度;经验正交分解分析;降雨
基金项目(Foundation): 国家自然科学基金（42276019）;; 广东省基础与应用基础研究基金（2024A1515012572）;; 广东普通高校创新团队项目（2023KCXTD015）;; 广东省粤西热带海洋生态环境野外科学观测研究站项目（2024B1212040008）
作者(Author): 刘思萌,李君益,叶小敏,谢玲玲,曾飞鸿
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