层状云层以上的湿度对间接气体气候的影响,迫使气溶气体
Andrew S Ackerman1, Michael P Kirkpatrick, David E Stevens
1NASA Ames Research Center, Moffett Field, California 94035, USA. andrew.ackerman@nasa.gov
Nature
|December 24, 2004
概括
污染可以通过制造反射太阳光的较小云滴来冷却地球. 然而,这种间接的气溶强迫是复杂的,因为增加的云水并不总是发生,影响气候模型.
科学领域:
- 大气科学 大气科学
- 气候建模 气候建模
- 云的微物理学 云的微物理学
背景情况:
- 人为温室气体导致全球变暖.
- 气溶颗粒可以通过增加云层中的太阳辐射反射来抵消变暖.
- 由于复杂的气溶-云相互作用,间接气溶强迫的理解很差.
研究的目的:
- 为了研究气溶诱导的云滴变化和云水含量之间的关系.
- 确定影响云水对压制降水反应的因素.
- 改进气候模型中间接气溶强迫的估计.
主要方法:
- 使用流体动力学模型对状云的模拟.
- 包括详细的云微物理和辐射转移处理.
- 分析了表面降水和引流干燥之间的竞争.
主要成果:
- 云水的反应取决于上层空气和滴水度的湿度.
- 干燥空气的增强吸收通常占主导地位,随着水滴度的增加,降低云水.
- 这种降低云水减少了间接气候强迫,与一些预期相反.
结论:
- 间接的气溶强迫是复杂的,并取决于大气条件.
- 海洋边界层云可能不会在受到污染时积累更多的水.
- 准确的气候建模需要更好地了解气溶 - 云 - 引力相互作用.
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