Chauhan Akshay, Jariwala Namrata, Christian Robin
Department of Civil Engineering, S. V. National Institute of Technology, Surat, 395007, Gujarat, India.
Environ Sci Pollut Res Int. 2025 Mar;32(12):7374-7386. doi: 10.1007/s11356-024-34026-x. Epub 2024 Jun 24.
An extinction of incoming solar radiation is taking place by absorption and scattering by dust, water droplets, and gaseous molecules. Such phenomena are responsible for altering meteorological variables. In the present study, temporal analysis of the aerosol optical thickness (AOT) and black carbon (BC) surface mass concentration was undertaken using an ozone monitoring instrument (OMI) and modern-era retrospective analysis for research and applications, version 2 (MERRA-2) satellite from the year 2018 to 2022. The study was mainly focused on the western states of India which are Rajasthan, Gujarat, and Maharashtra. The correlation of AOT and BC surface mass concentration with near-surface temperature (2m above ground level) was analyzed. BC and temperature shows strong negative correlation as BC is known for its absorption of radiation. It accumulates in the atmosphere and contributes to atmospheric warming while simultaneously bringing down the near-surface air temperature due to the reduced sunlight reaching the ground. Also, seasonal analysis was conducted for winter, summer, monsoon, and post-monsoon, which shows the higher values of AOT in monsoon; however, seasonal average BC surface mass concentration was found high in winter in each year for all three states. AERONET data from Jaipur, Rajasthan, and Pune, Maharashtra for the year 2021 was used to further evaluate the AOT generated from OMI. The results demonstrated a significant connection, with R values of 0.62 and 0.69, respectively. The temperature retrieved from MERRA-2 was also validated with ground truth data of the Continuous Ambient Air Quality Monitoring Station (CAAQMS) at both stations showing high agreement with R > 0.70.
入射太阳辐射正通过尘埃、水滴和气态分子的吸收与散射而发生衰减。此类现象会改变气象变量。在本研究中，利用臭氧监测仪（OMI）和现代回溯分析研究与应用版本2（MERRA - 2）卫星，对2018年至2022年期间的气溶胶光学厚度（AOT）和黑碳（BC）表面质量浓度进行了时间分析。该研究主要聚焦于印度西部的拉贾斯坦邦、古吉拉特邦和马哈拉施特拉邦。分析了AOT和BC表面质量浓度与近地表温度（地面以上2米）的相关性。BC与温度呈现出很强的负相关性，因为BC以吸收辐射而闻名。它在大气中积聚，导致大气变暖，同时由于到达地面的阳光减少，使得近地表气温下降。此外，还对冬季、夏季、季风期和季风后期进行了季节分析，结果表明季风期的AOT值较高；然而，所有三个邦每年冬季的BC表面质量浓度季节性平均值都较高。利用来自拉贾斯坦邦斋浦尔和马哈拉施特拉邦浦那2021年的AERONET数据，进一步评估了由OMI生成的AOT。结果显示存在显著关联，R值分别为0.62和0.69。从MERRA - 2获取的温度也与两个站点的连续环境空气质量监测站（CAAQMS）的地面实测数据进行了验证，结果显示二者高度一致，R > 0.70。
