黄山夏季气溶胶多尺度吸湿性的参数化方案构建研究

发布时间：2018-05-25 06:22

  本文选题：气溶胶 + 化学组分　； 参考：《气象学报》2016年06期

【摘要】：利用2014年7月在黄山光明顶观测的气溶胶吸湿性参数(κ)和气溶胶离子化学组分、有机碳(OC,organic carbon)数据,对多尺度气溶胶吸湿性参数进行分析,并在此基础上建立了多尺度κ的参数化方案。研究结果表明,影响黄山夏季气溶胶来源的主要气团包括西南气团、北方气团以及东南气团。黄山夏季κ的变化范围为0.2—0.48,且随粒径增大成先增大后减小的分布特征;气溶胶粒径在0.15—1.1μm的强吸湿段,κ0.3,而在粒径小于0.15μm和粒径大于1.1μm弱吸湿段,κ0.3。不同气团背景下κ分布不同,气溶胶粒子在小于1.1μm的粒径段,当受西南气团影响时,κ值最大,而受东南气团影响时,κ值最小;在气溶胶粒径大于1.1μm时,κ在两个气团背景下呈现与气溶胶粒径小于1.1μm时相反的分布特征。影响粒径小于1.1μm气溶胶吸湿能力的主要水溶性化学组分为NH_4~+、SO_4~(2-)、水溶性有机碳(WSOC,water soluble organic carbon),而影响大于1.12μm粒径范围气溶胶吸湿能力的主要水溶性化学组分为NH_4~+、SO_4~-、NO_3~-、WSOC和Ca~(2+)。由气溶胶多尺度离子化学组分和WSOC构建的气溶胶κ的参数化方案,在小于1.1μm和大于1.1μm的粒径范围内的表达式分别为κ_(reg)=0.12+0.45f_(NH_4~+)+0.63f_(SO_4~(2-))+0.18 f_(WSOC)和κ_(reg)=0.01+0.78f_(NH_4~+)+0.76f_(NO_3)+0.8f_(SO_4~(2-))-0.28f_(Ca~(2+))+0.14f_(WSOC)(f为对应组分的质量份数)。两个参数化方案均能较好地预报κ,预报值κreg与κ的计算值间存在较好的相关关系,相关系数通过了置信度99%的显著性检验,且预报误差在30%范围内。
[Abstract]:Based on the aerosol hygroscopicity parameters (魏) and aerosol ion chemical components, organic carbon (OC), observed in July 2014 at the top of the Huangshan Mountains, the multi-scale aerosol hygroscopicity parameters were analyzed. On this basis, the parameterization scheme of multi-scale 魏 is established. The results show that the main aerosol sources in the summer of Huangshan Mountain include the southwest air mass, the northern air mass and the southeast air mass. The variation range of 魏 in Huangshan summer is 0.2-0.48, and it increases first and then decreases with the increase of particle size, and the aerosol particle size increases at 0.15-1.1 渭 m, 魏 0.3, and 魏 0.3 in the phase of particle size less than 0.15 渭 m and the particle size larger than 1.1 渭 m. The distribution of 魏 is different in different air mass background. When the size of aerosol particles is less than 1.1 渭 m, the 魏 value of aerosol particles is the largest when affected by southwest air mass, and the smallest when affected by southeast air mass. When the size of aerosol is larger than 1.1 渭 m, the distribution of 魏 is opposite to that of aerosol smaller than 1.1 渭 m in two aerosols. The main water-soluble chemical components which affect the moisture absorption ability of aerosol with diameter less than 1.1 渭 m are NH _ 4 ~ S _ 4, W _ SOC _ 2O soluble organic carbon, while the main water-soluble chemical components which affect the moisture absorption ability of aerosol larger than 1.12 渭 m are NH _ 4 ~ T _ 4, O _ 4, O _ 3-WSOC and Ca~(2. 鐢辨皵婧惰兌澶氬昂搴︾�诲瓙鍖栧�︾粍鍒嗗拰WSOC鏋勫缓鐨勬皵婧惰兌魏鐨勫弬鏁板寲鏂规��,鍦ㄥ皬浜，

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