何涛,李君益,郑全安,谢玲玲

• 1:广东海洋大学海洋与气象学院
• 2:自然资源部空间海洋遥感与应用重点实验室
• 3:陆架及深远海气候
• 4:资源与环境广东省高等学校重点实验室

摘要(Abstract)：

【目的】研究南海上层大气NO_2柱浓度的时空分布特征及其影响因素，探讨南海大气氮沉降通量及其对海表叶绿素a浓度的影响。【方法】使用2005—2020年大气NO_2柱浓度的OMI遥感产品、ERA-5再分析降水数据、边界层高度数据、风速数据以及海洋表层叶绿素a浓度月平均遥感数据，分析南海大气氮沉降通量及其对海表叶绿素a的影响。【结果与结论】南海附近区域大气高浓度NO_2主要分布在珠江三角洲。NO_2浓度随季节变化较大的区域主要分布在南海北部陆地、陆架；其余海域大气中NO_2浓度终年较低。珠江三角洲附近大气NO_2柱浓度高值出现在12月及次年1月，年平均氮沉降通量均值为13.50 kg·hm~(-2)。南海北部陆架大气的NO_2柱浓度峰值出现在3月，氮沉降通量年平均值为4～8 kg·hm~(-2)，其余海域的NO_2柱浓度峰值则出现在3月或4月，氮沉降通量年平均值为0.5 kg·hm~(-2)。NO_2柱浓度主要受到降水和风速的共同影响，其中，降水通过淋溶作用消耗NO_2，风则通过稀释作用降低NO_2柱浓度，同时，冬季季风还可将南海北部陆地空气中的高浓度NO_2输送到南海。强厄尔尼诺事件过后的春季由于中南半岛生物质燃烧的增加以及珠江三角洲区域降水量增加，使得氮沉降通量出现明显增加。吕宋海峡西部，氮沉降能造成约10%的叶绿素a浓度增加。

关键词(KeyWords)： OMI遥感数据;大气氮沉降;K-means聚类;叶绿素a浓度;南海

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划（2022YFC3104805）;; 广东普通高校创新团队项目（2019KCXTF021）;; 广东省冲一流专项资金（231419012,231919030）

作者(Author): 何涛,李君益,郑全安,谢玲玲

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