使用Argo和卫星数据研究热带气旋对印度洋北部溶解氧气的影响
Bhanu Priya Boipai1, Sachiko Mohanty2
1Indian Institute of Remote Sensing, ISRO, Dehradun, Uttarakhand, India; Currently at Centre for Atmospheric Sciences, IIT Delhi, New Delhi, India.
Marine pollution bulletin
|February 18, 2025
概括
热带气旋显著改变了印度洋的溶解氧 (DO) 和氧气最小区 (OMZ) 厚度. 由TC引起的上升和混合会产生多种多样的DO形状,影响海洋学条件.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋生物学 海洋生物学
- 气候科学 气候科学
背景情况:
- 印度洋北部有显著的氧气最小区 (OMZ).
- 热带气旋 (TC) 是影响海洋过程的主要天气现象.
- 了解TC对DO和OMZ的影响对海洋生态系统至关重要.
研究的目的:
- 调查热带气旋对溶解氧 (DO) 分布的影响.
- 分析印度洋北部氧气最小区 (OMZ) 厚度的变化.
- 描述由TC事件产生的不同DO配置文件.
主要方法:
- 分析印度洋北部2019-2022年海洋学数据.
- 利用BGC-Argo浮标的数据来观察垂直的DO档案.
- 与观察到的DO和OMZ变化相关联TC轨道和强度.
主要成果:
- 由于TC,OMZ的厚度在610-753米 (孟加拉湾) 和922-1179米 (阿拉伯海) 之间变化.
- 锡特兰特区导致OMZ厚度超过740米,与季风后的Fani和Yas特区形成鲜明对比.
- 观察到三种不同的DO变化模式:上升驱动的下降,混合诱导的增加和组合效应.
结论:
- TCs诱导OMZ厚度和DO分布的显著,位置特定的变化.
- 接近地表的风应力和垂直混合是推动这些变化的关键机制.
- 由TC引起的上游可以将低氧的深水带到较浅的深度,影响海洋生物.
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