Measuring morphology and density of internally mixed black carbon with SP2 and VTDMA: new insight to absorption enhancement of black carbon in the atmosphere

- Y. X. Zhang1, Q. Zhang1,6, Y. F. Cheng2, H. Su2, S. Kecorius3, Z. B. Wang3,2, Z. J. Wu4,3, M. Hu4,6, T. Zhu4,6, A. Wiedensohler3, and K. B. He5,