使用OMI和MERRA-2的气溶和黑碳变异性及其与近地表空气温度的关系
Akshay Chauhan1, Namrata Jariwala2, Robin Christian1
1Department of Civil Engineering, S. V. National Institute of Technology, Surat, 395007, Gujarat, India.
概括
气溶光学厚度和黑碳显著影响印度西部近地表温度. 较高的黑碳度与较低的温度相关,特别是在冬季,影响区域气候动态.
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:
- 进入的太阳辐射被大气中的气溶和气体减弱,影响气象变量.
- 气溶光学厚度 (AOT) 和黑碳 (BC) 是大气污染及其对辐射平衡的影响的关键指标.
研究的目的:
- 分析2018-2022年在印度西部 (拉贾斯坦邦,古吉拉特邦,马哈拉施特拉邦) 的AOT和BC表面质量度的时间和季节变化.
- 为了研究AOT,BC和近地表空气温度之间的相关性.
- 通过地面测量来验证来自卫星的AOT和温度数据.
主要方法:
- 利用了来自臭氧监测仪器 (OMI) 和现代时代研究和应用的回顾性分析,AOT和BC度的第2版本 (MERRA-2) 卫星的数据.
- 进行了时间和季节性分析,将AOT和BC与近地表温度 (2米以上地面) 相关联.
- 通过使用AERONET数据和MERRA-2温度数据与持续环境空气质量监测站 (CAAQMS) 记录验证的OMI衍生AOT.
主要成果:
- 在BC表面质量度和近地表温度之间观察到强烈的负相关性,这表明BC在降低地面温度方面的作用.
- 在所有研究的州中,AOT值在季风季节达到峰值,而BC度在冬季最高.
- 验证显示卫星和地面数据之间存在显著一致,AOT的R2值为0.62-0.69,温度为>0.70.
结论:
- 黑碳通过吸收太阳辐射并减少到达地面的阳光,显著影响近地表空气温度.
- AOT和BC度的季节性模式各不相同,分别在季风和冬季出现明显的峰值.
- 当卫星数据得到验证后,可提供AOT和温度的可靠估计,这对于了解区域气候影响至关重要.
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