东部大陆边界的冬季寒冷是由温暖的海洋水引起的
1California Institute of Technology, Pasadena, California 91125, USA. yohai@alum.mit.edu
Nature
|April 2, 2011
概括
东北大陆由于大气波浪而经历了异常寒冷的冬天. 温暖的海洋水驱动这些罗斯比波,冷却东部大陆边界,影响全球天气模式.
科学领域:
- 大气科学 大气科学
- 气候学 气候学 气候学
- 气象学 天气学
背景情况:
- 东北北美和亚洲在相似的度处表现出异常的冬季寒冷.
- 以前的解释涉及地形和缺乏海上影响,但大陆差异表明其他因素.
研究的目的:
- 调查大气波辐射在解释东北大陆异常冬季寒冷中的作用.
- 为了识别除了地形和海洋影响之外的机制,有助于区域温度对比.
主要方法:
- 使用理想化的一般循环模型进行模拟.
- 对大规模大气波 (罗斯比波) 西向辐射的分析.
- 检查罗斯比波的特性,如群体速度和对行星旋转的依赖.
主要成果:
- 异常寒冷的冬季部分原因是海洋变暖所产生的西向传播的罗斯比波.
- 寒冷地区的范围是由罗斯比波特征决定的.
- 温暖的海洋水冷却了东部的大陆边界,造成了温度对比.
结论:
- 罗斯比波动力学是特定大陆地区异常冬季降温的关键机制.
- 海洋变暖不仅影响了西部边界的温暖,也影响了东部边界的冷却.
- 这种机制有助于大陆东部和西部之间的中度冬季温度的对比.
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