千米尺度合模拟和模型观察SST趋势差异差异
Sarah M Kang1, Dian A Putrasahan1, Noel G Brizuela1
1Max Planck Institute for Meteorology, Hamburg, Germany.
概括
这项研究表明,一种新的气候模型准确地模拟了太平洋东南部和南大洋海面温度 (SST) 的降温,从而改善了气候预测. 这一进步解决了模型与现实世界观测之间的关键差异.
科学领域:
- 气候科学 气候科学
- 海洋学 海洋学 海洋学
- 大气科学 大气科学
背景情况:
- 热带太平洋的海面温度 (SST) 模式显著影响全球气候,影响大气循环和降雨.
- 精确的SST趋势模拟对于可靠的气候预测至关重要,但目前的模型显示与观测的差异,特别是在东南太平洋和南大洋的降温.
- 在这些地区观察到的冷却趋势与大多数合模型对比项目 (CMIP) 模型模拟的变暖形成鲜明对比,这引发了对预测可靠性的担忧.
研究的目的:
- 评估ICON合模型在模拟观测到的海面温度 (SST) 趋势方面的能力.
- 研究精细空间分辨率和特定物理过程在准确捕获SST模式中的作用.
- 解决气候模型中的差异,提高对短期气候预测的信心.
主要方法:
- 利用ICON合模型与5公里海洋和10公里大气网格空间进行历史模拟.
- 直接代表了南极环极前线的旋转热传输.
- 纳入了在亚热带东南太平洋地区现实化的层积云反.
主要成果:
- ICON模型成功地复制了观察到的SST趋势,包括南大洋和东南热带太平洋的冷却.
- 该模型的忠实性归因于热传输和现实的云反的直接表示.
- 高空间分辨率是捕获热吸收机制的关键,富含的南大洋.
结论:
- 这项研究表明了解决历史气候模拟中长期存在的偏见的途径.
- 精确模拟区域SST模式,特别是冷却趋势,可以通过高分辨率模型实现.
- 改进的模型忠实性提高了对短期区域气候变化预测的信心.
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