高级检索
张丹瑜婷, 廖宏, 李柯, 等. 2023. “大气污染防治行动计划”执行以来我国夏季大气OH浓度变化的数值模拟[J]. 大气科学, 47(3): 713−724. doi: 10.3878/j.issn.1006-9895.2112.21218
引用本文: 张丹瑜婷, 廖宏, 李柯, 等. 2023. “大气污染防治行动计划”执行以来我国夏季大气OH浓度变化的数值模拟[J]. 大气科学, 47(3): 713−724. doi: 10.3878/j.issn.1006-9895.2112.21218
ZHANG Danyuting, LIAO Hong, LI Ke, et al. 2023. Numerical Simulation of Summertime OH Concentrations in China Since the Implementation of the Air Pollution Prevention and Control Action Plan [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 713−724. doi: 10.3878/j.issn.1006-9895.2112.21218
Citation: ZHANG Danyuting, LIAO Hong, LI Ke, et al. 2023. Numerical Simulation of Summertime OH Concentrations in China Since the Implementation of the Air Pollution Prevention and Control Action Plan [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 47(3): 713−724. doi: 10.3878/j.issn.1006-9895.2112.21218

“大气污染防治行动计划”执行以来我国夏季大气OH浓度变化的数值模拟

Numerical Simulation of Summertime OH Concentrations in China Since the Implementation of the Air Pollution Prevention and Control Action Plan

  • 摘要: OH自由基是对流层中主要的氧化剂,是大气氧化性的重要表征。文章利用GEOS-Chem模式量化了2014~2017年“大气污染防治行动计划”执行以来,人为排放和气象因素变化对中国夏季大气OH浓度变化的贡献。模拟结果表明,2014~2017年间夏季整个中国OH浓度呈现上升趋势,最大上升出现在30°N附近的华南地区。在华北平原地区,OH浓度也呈明显的上升趋势(0.1×106 molecules cm−3 a−1),而OH浓度比较高的珠江三角洲地区的OH变化趋势较小。敏感性试验结果表明,气象和人为排放变化都对2014~2017年华北平原OH浓度上升有促进作用,但人为排放的贡献(OH增加10.0%)远大于气象的贡献(OH增加1.5%);OH浓度变化最大的南方地区主要是气象条件控制。进一步对气象因素分析发现,影响全国OH 变化最重要的气象要素是太阳短波辐射,决定了2014~2017年中国OH浓度增长趋势最大的区域。但在华北地区,2014~2017年短波辐射略微减少的影响被边界层高度明显降低带来的OH增加所抵消。

     

    Abstract: The OH radical is the primary tropospheric oxidant, accounting for the oxidation capacity of the atmosphere. The GEOS-Chem model was used to examine the impact of anthropogenic emission and meteorological parameter changes on summertime OH concentrations in China since the implementation of the Air Pollution Prevention and Control Action Plan. Our modeling results for the years 2014–2017 demonstrate that the summertime OH concentrations in China exhibited an overall upward trend with the fastest increase occurring around 30°N over eastern China; the North China Plain was also simulated to have an obvious upward OH concentration trend of 0.1 × 106 molecules cm−3 a−1 while the Pearl River Delta experienced a weak downward trend. Further sensitivity experiment simulations showed that changes in both meteorology and anthropogenic emissions over the years 2014–2017 contributed to the increases in OH concentrations in the North China Plain, wherein the contribution of anthropogenic emissions was significantly larger than that of meteorology (10% vs. 1.5%). Meteorology played a major role in OH concentration increase around 30°N over eastern China. Further meteorological analysis demonstrated that the meteorological variable with the greatest contribution was solar shortwave radiation, which can explain the changes in the OH concentrations over a large fraction of China during 2014–2017. However, the role of solar shortwave radiation was offset by the boundary layer height in impacting the changes in OH concentrations during 2014–2017 in the North China Plain.

     

/

返回文章
返回