1. Ding Z L, Derbyshire E, Yang S L, et al. Stepwise expansion of desert environment across northern China in the past 3.5 Ma and implications for monsoon evolution. Earth Planet Sci Lett, 2005, 237: 45–55
2. Wang T, Chen G T, Qian Z A, et al. Situation of sand-dust storms and countermeasures in North China (in Chinese). J Desert Res, 2001, 21: 322–327
3. Dong Z B, Wang T, Qu J J. The history of desert science over the last 100 years (in Chinese). J Desert Res, 2003, 23: 1–5
4. Mao J T, Zhang J H, Wang M H. Summary comment on research of atmospheric aerosol in China (in Chinese). Acta Meteorol Sin, 2002, 60: 625–633
5. Irons J. Solar Radiation Scattering by Soils. PhD Dissertation. Baltimore: University of Maryland, 1993. 207