云和热力学对辐射的控制塑造了地表温度和陆地上的流
Sarosh Alam Ghausi1,2,3, Yinglin Tian4, Erwin Zehe3
1Biospheric Theory and Modelling Group, Max Planck Institute for Biogeochemistry, Jena 07745, Germany.
概括
辐射和热力学主要控制陆地表面温度 (LST),云层显著降温潮湿地区. 干旱地区以增加的感知热量流来补偿,揭示了气候模式的新兴简单性.
科学领域:
- 地球和环境科学 地球和环境科学
- 大气科学 大气科学
- 气候科学 气候科学
背景情况:
- 陆地表面温度 (LSTs) 受辐射,流和水文循环的影响.
- 通过云层和蒸发,水蒸气调节区域温度.
- 了解这些相互作用是理解气候动态的关键.
研究的目的:
- 调查干旱和潮湿地区LSTs气候变化的主要驱动因素.
- 为了确定辐射效应与流和水文过程在LST变化的作用.
- 为了阐明热力学约束对热和水分流的热力学约束.
主要方法:
- 使用热力学系统框架.
- 通过独立的观察数据强制构建框架.
- 分析了卫星观测云和晴天的情况.
主要成果:
- 气候LST变化主要是由辐射效应介导的.
- 流 (感应和潜热) 受到当地的辐射条件的热力学约束.
- 云层显著冷却潮湿的陆地表面 (高达7K),由于缺乏云层覆盖,干旱地区没有这种效应.
- 在干旱地区减少的蒸发被感应热量流和浮力增加所补偿.
结论:
- 辐射和热力学极限是LST和流交换的主要控制.
- 云在调节LST方面发挥着至关重要的作用,特别是在潮湿的地区.
- 尽管系统复杂,但观察到的气候模式表现出由这些基本控制驱动的新兴简单性.
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