Yan Feng, Argonne National Laboratory, Environmental Science Division, Argonne, IL, United States, Xiaohong Liu, Texas A&M University College Station, College Station, TX, United States, Laura Fierce, Brookhaven National Laboratory, Environmental & Climate Sciences, Upton, NY, United States, Zifeng Lu, Argonne National Laboratory, Argonne, IL, United States and Lulu Xu, Department of Earth System Science, Tsinghua University, Beijing, China