观测证据表明,由于间接的气溶效应,辐射强迫发生了变化
Joyce E Penner1, Xiquan Dong, Yang Chen
1Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109-2143, USA. penner@umich.edu
Nature
|January 16, 2004
概括
人类产生的气溶通过增强云的反射性来显著影响气候,这种现象被称为间接的气溶效应. 这项研究提供了观察证据,表明气溶会大幅改变辐射流,影响地球的能量平衡.
科学领域:
- 大气科学 大气科学
- 气候科学 气候科学
- 气溶科学 气溶科学
背景情况:
- 人类气溶会影响云的反射性,造成冷却效应 (间接气溶效应).
- 直接的观测证据将气溶的度与辐射强迫变化联系起来是具有挑战性的.
- 了解气溶与云之间的相互作用对于准确的气候建模至关重要.
研究的目的:
- 提供间接气溶对辐射流的间接气溶影响的观察证据.
- 量化气溶对云的光学性能的影响.
- 评估气溶诱导的变化对表面辐射的影响.
主要方法:
- 在受污染的 (俄克拉荷马州) 和干净的 (北极阿拉斯加州) 地点比较气溶和云的特性.
- 从观察到的短波向下表面辐射来确定云的光学深度.
- 模拟云的光学深度,使用基于观测到的气溶属性的云块模型.
主要成果:
- 在模拟的间接气溶效应和观察到的表面辐射之间发现了强烈的一致性.
- 观测数据证实了由于气溶造成的辐射流的实质性变化.
- 云的光学特性受到气溶度的显著影响.
结论:
- 间接的气溶效应显著影响辐射流.
- 气溶与云的相互作用在地球的辐射强迫中发挥着关键作用.
- 这项研究加强了气候科学中间接气溶效应的观测基础.
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