在过去的二十年中,全球各地的高贡献性气溶类型/物种的变化模式在不断变化
Gopika Gupta1, M Venkat Ratnam1, B L Madhavan1
1National Atmospheric Research Laboratory (NARL), Gadanki 517112, India.
The Science of the total environment
|July 9, 2023
概括
全球气溶排放正在发生变化,一些地区显示气溶光学深度下降,但尘埃和有机碳增加. 自由热带层中的气溶由于居住时间较长,对气候产生更大的影响.
科学领域:
- 大气科学 大气科学
- 气候科学 气候科学
- 环境科学 环境科学
背景情况:
- 在过去的二十年中,全球城市化和工业化导致气溶排放的快速变化.
- 气溶的不断变化的化学特性及其对气溶总负载的贡献尚未完全量化.
- 了解长期的气溶趋势对于准确的气候建模和政策制定至关重要.
研究的目的:
- 分析气溶类型的长期变化模式及其对气溶总负载的贡献.
- 调查气溶在增加或减少气溶光学深度 (AOD) 的地区的气溶趋势.
- 检查不同气溶类型的垂直分布和日间变化及其对气候的影响.
主要方法:
- 使用了研究和应用的现代时代回顾分析版本2 (MERRA-2) 气溶物种数据集 (2001-2020).
- 应用多变量线性回归趋势分析,以确定AOD和气溶物种的重大趋势.
- 采用有直角偏振 (CALIOP) 的云气溶激光雷达数据 (2006-2020年) 来分析不同高度和时间的气溶灭绝概况.
主要成果:
- 尽管东北美洲和中国部分地区的AOD总体下降,但分别观察到尘埃和有机碳气溶的增加.
- 自由热带层中的气溶具有更高的贡献和更长的停留时间,特别是吸收气溶,这表明了显著的长期气候影响.
- 分析显示了不同的气溶垂直分布和影响辐射效应的日间变化.
结论:
- 长期的气溶趋势受到能源使用,区域政策和气象条件等因素的影响.
- 该研究强调了考虑气溶垂直分布和组成对于准确的气候变化评估的重要性.
- 需要进一步的研究,以充分理解和量化各种气溶物种对全球气候系统不断变化的影响.
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