Scholarlink

<p>The present study explores how fog during the winter affects the optical and radiative characteristics of aerosols over Ranchi, the Indian state capital of Jharkhand. From December 13, 2022, to January 4, 2023, ground-based measurements of the aerosol optical depth/thickness (AOD/AOT) were conducted in order to investigate the diurnal change of AOD and associated optical properties. Aerosol radiative forcing (ARF) was estimated using the SBDART (Santa Barbara DISORT Atmospheric Radiative Transfer) model after important spectral aerosol properties, including Single Scattering Albedo (SSA) and asymmetry parameter (AP), were obtained using the OPAC (Optical Properties of Aerosols and Clouds) model. AOD varied significantly during the study period, with sunny winter days recording the lowest values (0.21 ± 0.02) and foggy days recording the highest values (2.52 ± 0.40). Indicating the predominance of coarse mode aerosols, the Angstrom exponent significantly decreased from 1.35 on clear days to 0.8 on foggy days. This was probably caused by the hygroscopic development of particles in foggy situations. In the atmosphere, aerosol radiative forcing rose significantly from 2.5 W/m<sup>2</sup> on clear days to 47.4 W/m<sup>2</sup> on foggy days. Based on&#xa0;48-h back trajectory analysis, most of the air masses that occurred during the study period emerged from northern areas, such as Hilsa and Patna in Bihar, with a few local sources contributing as well. Overall, the work highlights how fog significantly affects aerosol properties and increases atmospheric radiative forcing, emphasizing the necessity of taking fog-related processes into account in regional climate and air quality models.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigating Fog-Induced Variations in Aerosol Radiative Forcing Over Ranchi, India

  • 期刊论文

  • 发表日期：

    2026年3月28日

查看全文
  • Dipanjan Bhattacharjee,
  • Jashvant K. Prasad,
  • Sanat Kumar Das,
  • Swagata Payra,
  • Divya Prakash,
  • Susmita Majumdar

摘要

The present study explores how fog during the winter affects the optical and radiative characteristics of aerosols over Ranchi, the Indian state capital of Jharkhand. From December 13, 2022, to January 4, 2023, ground-based measurements of the aerosol optical depth/thickness (AOD/AOT) were conducted in order to investigate the diurnal change of AOD and associated optical properties. Aerosol radiative forcing (ARF) was estimated using the SBDART (Santa Barbara DISORT Atmospheric Radiative Transfer) model after important spectral aerosol properties, including Single Scattering Albedo (SSA) and asymmetry parameter (AP), were obtained using the OPAC (Optical Properties of Aerosols and Clouds) model. AOD varied significantly during the study period, with sunny winter days recording the lowest values (0.21 ± 0.02) and foggy days recording the highest values (2.52 ± 0.40). Indicating the predominance of coarse mode aerosols, the Angstrom exponent significantly decreased from 1.35 on clear days to 0.8 on foggy days. This was probably caused by the hygroscopic development of particles in foggy situations. In the atmosphere, aerosol radiative forcing rose significantly from 2.5 W/m2 on clear days to 47.4 W/m2 on foggy days. Based on 48-h back trajectory analysis, most of the air masses that occurred during the study period emerged from northern areas, such as Hilsa and Patna in Bihar, with a few local sources contributing as well. Overall, the work highlights how fog significantly affects aerosol properties and increases atmospheric radiative forcing, emphasizing the necessity of taking fog-related processes into account in regional climate and air quality models.