对中国的长期MODIS MAIAC气溶产品的评估和分析
Ge Huang1, Xin Su2, Lunche Wang3
1Hubei Key Laboratory of Regional Ecology and Environmental Change, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430078, China.
The Science of the total environment
|July 24, 2024
概括
美国国家航空航天局NASA NASA
科学领域:
- 大气科学 大气科学
- 遥感 遥感 遥感 遥感
- 环境监测 环境监测
背景情况:
- 美国宇航局的中等分辨率成像光谱辐射仪 (MODIS) 提供了气溶光学深度 (AOD) 数据.
- 大气校正的多角度实现 (MAIAC) 算法处理MODIS数据.
- 新版本,系列6 (C6) 和系列6.1 (C6.1),提供AOD在1公里分辨率.
研究的目的:
- 将MAIAC C6和C6.1 AOD产品与AERONET观测结果验证并进行比较.
- 评估更新产品的准确性和稳定性.
- 分析中国的时空空间AOD特征.
主要方法:
- 使用AERONET地面AOD测量进行验证.
- C6 和 C6.1 MAIAC AOD产品的比较.
- 准确性 (R,BIAS,EE) 和稳定性指标的统计分析.
- 在中国不同地区进行时空分析.
主要成果:
- 总体而言,MAIAC AOD的准确性很好 (R > 0.9,BIAS < 0.015,EE > 68%).
- 集合6.1 (C6.1) 与C6相比显示精度下降,特别是在中国南部.
- C6.1提高了检索频率和AOD不连续性,但在西藏高原引入了文物.
- 产品稳定性没有显著改善,并且不符合中国的GCOS目标.
结论:
- 虽然C6.1提供了一些改进,但其整体精度下降需要改进算法.
- 精度的区域差异突显出需要量身定制的验证.
- 需要进一步的工作来提高MAIAC产品的稳定性,以便长期监测气候.
- 该研究为未来的MAIAC算法开发和稳定的气溶记录创建提供了洞察力.
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