Impact of aerosol hygroscopic growth on the direct aerosol radiative effect in summer on North China Plain

Impact of aerosol hygroscopic growth on the direct aerosol radiative effect in summer on North China Plain
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华北平原夏季气溶胶吸湿增长对气溶胶直接辐射效应的影响

DOI:
10.1016/j.atmosenv.2016.10.013
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发表时间:
2016-12
影响因子:
5
通讯作者:
Nan Ma
Nan Ma
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Ye Kuang;Chunsheng Zhao;Jiangchuan Tao;Yuxuan Bian;Nan Ma

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利用中国灰霾天气地面观测资料和华北平原探空资料,研究了相对湿度廓线及其对气溶胶光学特性垂直变化和气溶胶直接辐射效应的影响。在2008年7月至9月获得的剖面中,约有一半的混合层内的相对湿度大于80%。大气相对湿度条件下气溶胶光学特性的垂直变化,包括消光系数(σext)、单次散射系数(SSA)和不对称因子(g),与干气溶胶的垂直变化有很大的不同,并且高度依赖于大气相对湿度廓线。由于气溶胶水分的吸收,气溶胶光学厚度和柱平均SSA和g的增加可分别达到64%,0.052和0.079。由于气溶胶吸湿增长在大气顶部的瞬时DARE的分数贡献达到60%,在高RH的配置文件。如果不考虑相对湿度对SSA或g的依赖性,DARE估计值可能有显著偏差。我们建议,如果没有它们的垂直廓线或柱平均值,则在估算DARE时,应使用地面环境的SSA和g值,而不是从干气溶胶中获得的SSA和g值。
In this paper, relative humidity (RH) profiles and their impacts on the vertical variations of aerosol optical properties and the direct aerosol radiative effect (DARE) have been investigated based on surface measurements from the Haze in China campaign and sounding data from the North China Plain. Among the profiles obtained from July to September in 2008, about half have RHs greater than 80% within the mixed layer. The vertical variations in the aerosol optical properties at ambient RH, including the extinction coefficient (σext), single scattering albedo (SSA) and asymmetry factor (g), are remarkably different from the variations in the dry aerosols and are highly dependent on the RH profiles. Increases of the aerosol optical depth and column-averaged SSA and g due to aerosol water uptake can reach up to 64%, 0.052 and 0.079, respectively. The fractional contribution to the instantaneous DARE at the top of the atmosphere due to aerosol hygroscopic growth reaches 60% in high RH profiles. DARE estimates can be significantly biased if the RH dependence of SSA or g is not considered. We suggest that if their vertical profiles or column-averaged values are absent, then the ambient values of SSA and g at the surface should be used rather than the values of SSA andgobtained from dry aerosols when estimating DAREs.
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