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<p>An online coupled regional climate-chemistry-aerosol model (RIEMS-Chem) was applied to investigate the direct radiative effect of crop residue burning (CRB) aerosols and feedbacks on meteorology during CRB events in June 2015. Model validation against observations demonstrates a generally good model ability in reproducing meteorological variables, PM<sub>2.5</sub> and its chemical components, and aerosol optical depth (AOD). On average, CRB aerosols contributed approximately 35 ~ 50% of total PM<sub>2.5</sub> mass concentrations and AOD in the cities near the fire spots during CRB events. Total CRB aerosols caused the maximum direct radiative effects (DRE) of -9.1&#xa0;W m<sup>− 2</sup> at the surface and 2.6&#xa0;W m<sup>− 2</sup> at the top of atmosphere (TOA) over northern Anhui province averaged over the CRB event on 19–21 June. The domain and period mean DRE by total CRB aerosols at TOA was estimated to be + 0.82&#xa0;W m<sup>− 2</sup> during the event over east China, indicating a warming effect caused by CRB aerosols. The relative magnitudes of DRE due to individual CRB carbonaceous aerosols were quantified as well. Black carbon (BC) dominated the total CRB DRE, producing a positive DRE (+ 1.0&#xa0;W m<sup>− 2</sup>) at TOA, which was approximately 4 times that by brown carbon (BrC) (0.24&#xa0;W m<sup>− 2</sup>) and opposite in sign to that by organic carbon (OC) (-0.43&#xa0;W m<sup>− 2</sup>) in terms of regional and CRB period mean. This demonstrated that BrC strengthened the warming effect by partly cancelling the cooling effect by OC, suggesting its important radiative effect during the CRB event. Due to the radiative effects, CRB aerosols perturbed meteorology considerably, causing the maximum decreases in T2 (air temperature at 2&#xa0;m) and PBLH (planetary boundary layer height) by approximately 0.3&#xa0;°C and 60&#xa0;m over the fire areas averaged over the CRB event. Among CRB aerosol components, BC exerted the largest effects on meteorology, whereas the meteorological changes induced by OC and BrC were similar in magnitude, and their combined effect was comparable to that by BC. This study highlights the important role of CRB aerosols and a non-negligible role of BrC in radiative and climatic effects of biomass burning aerosols.</p>

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Impacts of carbonaceous aerosols from summer crop residue burning on air quality, radiation and meteorology over east China

  • 期刊论文

  • 发表日期：

    2026年7月25日

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  • Yuanyuan Zheng,
  • Jian Wu,
  • Zhiwei Han,
  • Jiawei Li,
  • Jie Li,
  • Yunfei Wu,
  • Jing Wang,
  • Lin Liang

摘要

An online coupled regional climate-chemistry-aerosol model (RIEMS-Chem) was applied to investigate the direct radiative effect of crop residue burning (CRB) aerosols and feedbacks on meteorology during CRB events in June 2015. Model validation against observations demonstrates a generally good model ability in reproducing meteorological variables, PM2.5 and its chemical components, and aerosol optical depth (AOD). On average, CRB aerosols contributed approximately 35 ~ 50% of total PM2.5 mass concentrations and AOD in the cities near the fire spots during CRB events. Total CRB aerosols caused the maximum direct radiative effects (DRE) of -9.1 W m− 2 at the surface and 2.6 W m− 2 at the top of atmosphere (TOA) over northern Anhui province averaged over the CRB event on 19–21 June. The domain and period mean DRE by total CRB aerosols at TOA was estimated to be + 0.82 W m− 2 during the event over east China, indicating a warming effect caused by CRB aerosols. The relative magnitudes of DRE due to individual CRB carbonaceous aerosols were quantified as well. Black carbon (BC) dominated the total CRB DRE, producing a positive DRE (+ 1.0 W m− 2) at TOA, which was approximately 4 times that by brown carbon (BrC) (0.24 W m− 2) and opposite in sign to that by organic carbon (OC) (-0.43 W m− 2) in terms of regional and CRB period mean. This demonstrated that BrC strengthened the warming effect by partly cancelling the cooling effect by OC, suggesting its important radiative effect during the CRB event. Due to the radiative effects, CRB aerosols perturbed meteorology considerably, causing the maximum decreases in T2 (air temperature at 2 m) and PBLH (planetary boundary layer height) by approximately 0.3 °C and 60 m over the fire areas averaged over the CRB event. Among CRB aerosol components, BC exerted the largest effects on meteorology, whereas the meteorological changes induced by OC and BrC were similar in magnitude, and their combined effect was comparable to that by BC. This study highlights the important role of CRB aerosols and a non-negligible role of BrC in radiative and climatic effects of biomass burning aerosols.