Towards understanding hourly variations of ammonia in the urban atmosphere of the North China during winter

Xiaohong Yao1, Xiaolin Teng2, Jiajia Qi2, Jinhui Shi2, Huan Xie2, Yujiao Zhu2 and Huiwang Gao1, (1)Ocean University of China, Key Laboratory of Marine Environment and Ecology, Qingdao, China, (2)Ocean University of China, Qingdao, China