热带不稳定波浪的有效生成机制,如高分辨率合大气-海洋预测实验所示
Takahiro Toyoda1, L Shogo Urakawa2, Hidenori Aiki3
1Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan. ttoyoda@mri-jma.go.jp.
Scientific reports
|September 7, 2023
概括
高分辨率的合模型改善了热带不稳定波 (TIW) 的中期预测. 解决细度的海面温度变化可以提高局部预测的准确性,并完善TIW生成机制的理解.
科学领域:
- 海洋学 海洋学 海洋学
- 大气科学 大气科学
- 气候建模气候模型
背景情况:
- 热带不稳定波 (TIW) 是热带太平洋海面温度前沿的尖端形波动,在20世纪70年代被发现.
- 虽然TIWs显著影响海洋热预算,但它们对初始预测中局部变化的影响仍然不清楚.
- 之前的研究通过理论,分析和现场研究确定了潜在的生成机制.
研究的目的:
- 评估大气与海洋结合模型中水平分辨率对TIW中期预测的影响.
- 调查TIWs对现实初始化预测中局部变化的影响.
- 通过详细的能源分析,完善对TIW发电机制的理解.
主要方法:
- 采用合大气 - 海洋模型,用于中距离预测 (最多10天).
- 将模型输出与观测数据进行比较,包括海面温度,表面风应力,热量流和压力.
- 分析了TIW能量学,重点关注反旋风旋和反过程的能源.
主要成果:
- 高分辨率的合模型显著改善了与TIWs相关的海面温度前线的局部变化的表示.
- 解决微小规模的SST变化提高了中期预测的准确性.
- 确定巴罗热带和巴罗临床不稳定性作为反气旋旋的主要能量来源,反循环加强这些不稳定性.
结论:
- 高分辨率的合模型为热带不稳定波的中距离预测提供了明显的优势.
- 该研究通过阐明巴罗热和巴罗临床不稳定性及其反机制的作用来完善TIW生成的理解.
- 精细尺度的SST变异的准确表示对于改善热带太平洋地区的气候预测至关重要.
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