Spatial distribution and sources of winter black carbon and brown carbon in six Chinese megacities

Qian Zhang, Zhenxing Shen, Tian Zhang, Shaofei Kong, Yali Lei, Qiyuan Wang, Jun Tao, Renjian Zhang, Peng Wei, Chong Wei, Song Cui, Tiantao Cheng, Steven Sai Hang Ho, Ziyi Li, Hongmei Xu, Junji Cao