气溶污染极端事件可以通过全球再分析产品揭示吗?
Jingtao Li1, Tianhe Wang2, Chenrui Li3
1Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou, China.
The Science of the total environment
|March 3, 2024
概括
极端气溶污染事件 (APEE) 存在风险,但对其研究的再分析数据质量尚不清楚. 这项研究验证了MERRA-2和CAMS产品,发现它们对跟踪全球APEE趋势有用.
科学领域:
- 大气科学 大气科学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 极端气溶污染事件 (APEE) 对气候,环境和人类健康构成重大风险.
- 再分析产品提供时空气溶数据,但缺乏APEE研究的全面质量评估.
- 了解APEE的时空分布,变化和长期趋势是有限的.
研究的目的:
- 为了解决APEE研究再分析数据质量的科学差距.
- 对APEE的分布和变异模式进行全球研究.
- 评估MERRA-2和CAMS再分析产品在识别APEE时间趋势方面的有效性.
主要方法:
- 定义APEE为每日气溶光学深度 (AOD) 超过给定站点和月份的第90百分位.
- 在全球范围内选择了11个不同的陆地区域进行全球评估.
- 将MERRA-2和CAMS再分析产品与MODIS卫星数据和APEE频率,强度和时间趋势的地面观测进行了比较.
主要成果:
- 对于APEE发生时间表 (月度/季节性),MERRA-2和CAMS显示出高匹配率 (70-80%) 和与地面观测的强烈月度相关性 (>0.65).
- 大多数地区的总AOD,APEE AOD和APEE频率在观测和再分析产品中呈现下降趋势.
- 在南亚等特定地区观察到APEE指标的增长趋势.
结论:
- 重新分析产品 (MERRA-2和CAMS) 对于识别与APEE相关的时间趋势是有效和有用的.
- 该研究提供了对APEE研究再分析数据质量的全面评估.
- 这些发现有助于更好地了解全球APEE分布,变化和长期趋势.
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