组内消息
2020-06-01
The role of functional groups in the understanding of secondary organic aerosol formation mechanism from α-pinene
Highlights
•The SOA is characterized by O–H groups in the OH channel and C=O groups in the O3 channel
•The nO−H/nC=O ratio is a good parameter in revealing the difference of SOA between the O3 and OH oxidation channels
•The SOA from OH channel is mainly formed by autoxidation of RO2 radicals
•Different structures of RO2 radicals are responsible for the difference functional group signatures of SOA
Full text:https://doi.org/10.1016/j.scitotenv.2020.139831
组内消息
2020-05-05
Molecular composition and sources of water-soluble organic aerosol in summer in Beijing
Highlights
• Water-soluble organic aerosol was the major fraction of OA in summer in Beijing.
• SOA from regional and photochemical processing contributed dominantly to WSOA.
• A high diversity of CHO and CHOS molecular compounds in WSOA was observed.
• Formation of more organosulfates during polluted days than clean days in summer.
Qiu, Y., Xu, W., Jia, L., He, Y., Fu, P., Zhang, Q., Xie, Q., Hou, S., Xie, C., Xu, Y., Wang, Z., Worsnop, D.R., Sun, Y., 2020. Molecular composition and sources of water-soluble organic aerosol in summer in Beijing. Chemosphere 255, 126850.
组内消息
2019-12-31
Influences of different definitions of the winter NAO index on NAO action centers and its relationship with SST
对于冬季NAO指数的定义有很多，但尚不清楚这些不同的定义尤其是定义冬季NAO指数时所用的冬季时间定义不同是否会对NAO的研究带来影响。我们主要运用相关性和功率谱分析研究了基于不同定义方法和不同数据来源得到的冬季NAO指数的特征差异，分析了这种差异可能对研究NAO与北大西洋海表温度（SST）关系的影响。结果显示：不同的数据来源对NAO的定义影响不大，不同的定义方法有一定的影响；不同冬季时间定义得到的NAO对NAO活动中心位置和变化规律的描述不同；不同定义方法得到的NAO与SST的关系比较一致，但冬季定义持续时间越长，NAO与海温的关系越显著。
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