地球辐射的新兴半球不对称性
Norman G Loeb1, Tyler J Thorsen1, Seiji Kato1
1Science Directorate, NASA Langley Research Center, Hampton, VA 23681-2199.
概括
北半球相对于南半球变暗,影响吸收的太阳辐射. 这种半球不对称性挑战了自然云的补偿,并影响了气候循环.
科学领域:
- 地球科学 地球科学 地球科学
- 气候科学 气候科学
- 大气科学 大气科学
背景情况:
- 卫星观测揭示了地球能量平衡的长期趋势.
- 了解半球辐射差异对于气候建模至关重要.
研究的目的:
- 分析吸收太阳辐射 (ASR) 和输出长波辐射趋势的半球差异.
- 研究地球辐射平衡中新出现的半球不对称的驱动因素.
主要方法:
- 利用24年来自云层和地球辐射能量系统 (CERES) 的卫星数据.
- 分析了北半球和南半球之间的吸收太阳辐射和输出长波辐射的趋势.
主要成果:
- 在NH和SH之间观察到ASR的显著趋势差异 (0.34 ± 0.23 Wm-2 dec-1).
- 确定了气溶辐射相互作用,表面白度和水蒸气变化作为NH变暗的关键驱动因素.
- 发现,由于热带和热带以外地区的相反趋势,云层变化的贡献较小.
结论:
- 在ASR中观察到的半球不对称性挑战了自然云对外部强迫的补偿假设.
- 半球辐射不平衡与大气-海洋一般循环模式有关.
- 云对这种不平衡的反应对未来的气候预测有重大影响.
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