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可检测的船舶轨迹仅占船舶排放的气溶间接强制排放的5%
Tianle Yuan1,2, Hua Song1,3, Lili F Boss4
1Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD USA.
Communications earth & environment
|November 17, 2025
概括
可见的船舶轨迹仅占船舶排放气候强迫的5%. 大多数强迫来自无法检测的气溶,调和气候强迫估计和海洋云亮化研究中的差异.
科学领域:
- 大气化学和物理大气化学和物理
- 气候科学 气候科学
- 海洋气溶研究
背景情况:
- 船舶排放对海洋气溶产生重大影响,影响空气质量和地球的能量平衡.
- 目前对船只造成的气候强迫的估计在船舶轨道观测和基于模型的研究之间存在很大差异.
- 在量化船舶排放的气候强迫方面存在长期的差异.
研究的目的:
- 为了调和船只排放的气候强制估计的差异.
- 要量化总的气候强迫,包括气溶不形成可见的船舶轨迹.
- 调查2020年后船舶减少硫排放的影响.
主要方法:
- 使用了三种不同的强迫计算方法:自下而上 (可见的船舶轨迹),自上而下 (空间关系) 和混合方法.
- 机器学习被用来检测船舶轨迹,增强了以前的手动检测方法.
- 云滴数度变化和云调整被纳入混合模型.
主要成果:
- 可见的船舶轨迹对东南大西洋上空船舶排放的气候强迫总量仅贡献了5%.
- 气溶不形成可检测的船舶轨迹占气候强迫的大部分.
- 机器学习检测到的船舶轨迹产生了比手工方法更高的强迫力,但仍然占上下估计的一小部分.
- 上下调整和云调整方法显示,尽管云调整的区域差异,但对2020年后的硫排放减少达成一致.
结论:
- 可见的船舶轨迹仅占船舶排放造成的总气候影响的一小部分.
- 大多数船只引发的气候强迫源自气溶,不形成可见的轨迹.
- 结果协调了气溶间接强迫中的差异,并对海洋云亮化策略产生影响.
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