Centre for Development of Advanced Computing (C-DAC), Pune 411007, Maharashtra, India.
Indian Institute of Tropical Meteorology, Pune 411008, Maharashtra, India.
Environ Sci Technol. 2020 Apr 21;54(8):4790-4799. doi: 10.1021/acs.est.0c00329. Epub 2020 Apr 1.
Elevated PM concentrations frequently cause severe air pollution events in Delhi. Till recently, the effect of crop residue burning on the air quality in Delhi has not been fully quantified and the approaches to control the impact of fire emissions have not been effective. In this study, for the first time, we quantified the statewise contribution of post-monsoon crop residue burning in the northwestern states of India to surface PM concentrations in Delhi using several sensitivity experiments with the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) and FINNv1.5 fire emission inventory. Results were evaluated with ground-based observations in Delhi (21 stations), Punjab, and Haryana (14 stations). On average, ∼20% of PM concentration in Delhi during the post-monsoon season (October-November) was found to be contributed by nonlocal fire emissions. However, on typical air pollution events, fire emissions contributed as high as 50-75% (80-120 μg/m) to PM in Delhi, highlighting the importance of both external transport and local emissions to PM pollution in Delhi.
PM 浓度升高经常导致德里发生严重的空气污染事件。直到最近，农作物残茬燃烧对德里空气质量的影响还没有被充分量化，控制火灾排放影响的方法也没有效果。在这项研究中，我们首次使用天气研究与预报模型与化学耦合（WRF-Chem）和 FINNv1.5 火灾排放清单进行了几次敏感性实验，量化了印度西北部各州后季风期农作物残茬燃烧对德里地面 PM 浓度的州贡献。结果与德里（21 个站）、旁遮普邦和哈里亚纳邦（14 个站）的地面观测进行了评估。平均而言，发现德里后季风季节（10 月至 11 月）的 PM 浓度中有约 20%是由非本地火灾排放造成的。然而，在典型的空气污染事件中，火灾排放对德里 PM 的贡献高达 50-75%（80-120μg/m），突出表明外部运输和本地排放对德里 PM 污染都很重要。
