Sources of secondary organic aerosols over North China Plain in winter

Li Xing1, Guohui Li2, Xuexi Tie1, Cao Junji3 and Xin Long1, (1)Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, (2)Key laboratory of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Science, Xi'an, China, Xi'an, China, (3)Key laboratory of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Science, Xi’an, China, Xi'an, China