The combustion of fossil fuel in winter and stable weather process in autumn also lead to the high value of the ratio. The characteristics of diurnal variation of PM10 in urban area are different from it in background region.
冬季化石燃料燃烧取暖和秋季的稳定天气过程也往往造成大气中细粒子比例增大,PM2.5/PM10值升高;城市区域与背景区域的大气气溶胶日变化特征明显不同,除受日夜交替引起的大气边界层结构变化影响外,市区的日变化明显受人为活动强度变化的影响,表现出典型的城市特征。
参考来源 - 北京及周边地区大气气溶胶的质量浓度和无机组分的特征及其来源研究·2,447,543篇论文数据，部分数据来源于NoteExpress
此结论揭示了稳定天气条件下成都地区气象场的模拟及实时预报必须考虑精细化的下垫面状况。
This conclusion reveals that under the stable weather conditions in Chengdu field simulation of real-time weather forecasting must consider the refinement of the underlying surface conditions.
曾有一段时期天气很稳定。
看来天气有些不稳定。
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