Biogenic volatile organic compounds (BVOCs) play an important role in atmospheric chemistry due to their large quantities and high reactivity. In this study, the impacts of BVOC emissions on ozone formation were investigated based on MEGANv3.1 in the Yangtze River Delta (YRD) region, which has increasingly suffered from ozone pollution in recent years. The sensitivities of BVOC emissions to different drought stress configurations and the quality of emission factors were evaluated. Furthermore, BVOC contribution to ozone formation was simulated by integrated meteorology and air quality model system and the impacts of different BVOC emission scenarios on ozone concentration were discussed. Annual BVOC emissions estimated with the default drought stress configuration (i.e., base case) was 6.8 × 10⁵ tons. The drought stress algorithm implemented in MEGANv3.1 could suppress BVOC emissions by 58% and this algorithm was sensitive to the choice of wilting point values. The BVOC contribution to the average of daily maximum 8 h ozone concentration without drought stress effect in July 2016 was 104% higher than that in the base scenario when the drought stress effect is activated. Using an alternative set of wilting point led to BVOC contribution being 48% higher than that in the base scenario. High contributions of BVOCs to simulated ozone concentration were found in northern Zhejiang, especially in Hangzhou and its surrounding areas.

生物成因挥发性有机化合物（BVOC）的数量大且反应活性高，因此在大气化学中起着重要的作用。在这项研究中，基于MEGANv3.1在长江三角洲（YRD）地区研究了BVOC排放对臭氧形成的影响，而长江三角洲地区近年来受到越来越多的臭氧污染。评估了BVOC排放对不同干旱胁迫配置的敏感性和排放因子的质量。此外，通过综合的气象和空气质量模型系统模拟了BVOC对臭氧形成的贡献，并讨论了不同BVOC排放情景对臭氧浓度的影响。使用默认干旱胁迫配置（即基本情况）估算的年度BVOC排放量为6.8×10 ⁵吨。MEGANv3.1中实施的干旱胁迫算法可以将BVOC排放抑制58％，并且该算法对萎点值的选择很敏感。2016年7月，在没有干旱胁迫效应的情况下，BVOC对每日最大8小时臭氧浓度的平均水平比激活干旱胁迫效应的基本情景高104％。使用另一组枯萎点导致BVOC贡献比基本方案高48％。在浙江北部，特别是在杭州及其周边地区，发现BVOC对模拟臭氧浓度的贡献很大。