Concentration, size-distribution and deposition of mineral aerosol over Chinese desert regions

Article English OPEN
Zhang, Xiao Y. ; Arimoto, R. ; Zhu, G. H. ; Chen, T. ; Zhang, G. Y. (2011)

The mass-particle size distributions (MSDs) of 9 elements in ground-based aerosol samples from dust storm (DS) and non-dust storm (N-DS) periods were determined for 12 sites in 9 major desert regions in northern China. The masses of the 9 elements (Al, Fe, K, Mg, Mn, Sc, Si, Sr and Ti) in the atmosphere were dominated by local mineral dust that averaged 270 μg m−3, and the MSDs for the elements were approximately log-normal. On the basis of Al data, the < 10 μm particles account for ∼84% of the total dust mass over the deserts. Model-calculated (“100-step” method) dry deposition velocities (Vd) for the 9 dust-derived elements during N-DS periods ranged from 4.4 to 6.8 cm s−1, with a median value of 5.6 cm s-1. On the basis of a statistical relationship between D99% (the dust particle diameter corresponding to the uppermost 1% of the cumulative mass distribution) and Vd, one can also predict dry velocities, especially when D99% ranges from 30 to 70 μm. This provides a simple way to reconstruct Vd for dust deposits (like aeolian loess sediments in the Loess Plateau). The estimated daily dry deposition fluxes were higher during DS vs. N-DS periods, but in most cases, the monthly averaged fluxes were mainly attributable to N-DS dust. Two regions with high dust loading and fluxes are identified: the “Western High-Dust Desert” and the “Northern High-Dust Desert”, with Taklimakan Desert and Badain Juran Desert as their respective centers. These are energetic regions in which desert-air is actively exchanged, and these apparently are the major source areas for Asian dust.DOI: 10.1034/j.1600-0889.1998.t01-3-00001.x
  • References (32)
    32 references, page 1 of 4

    An, Z. S. and Porter, S. C. 1997. Millennial-scale climatic oscillations during the last interglaciation in central China. Geology 25, 603-606.

    An, Z. S., Kukla, G., Porter, S. C. and Xiao, Y. L. 1991a. Magnetic susceptibility evidence of monsoon variation on the Loess Plateau of central China during the last 130,000 years. Quaternary Research 36, 29-36.

    An, Z. S., Kukla, G., Porter, S. C. and Xiao, J. L. 1991b. Late Quaternary dust flow on the Chinese Loess Plateau. Catena 18, 125-132.

    An, Z. S., Liu, T. S., Lu, Y. C., Porter, S. C., Kukla, G., Wu, X. H. and Hua, Y. M. 1990. The long-term paleomonsoon variation recorded by the loess-paleosol sequence in central China. Quaternary International 718, 91-95.

    Arimoto, R., Duce, R. A., Ray, B. J. and Unni, C. K. 1985. Atmospheric trace elements at Enewetak Atoll, 2, Transport to the ocean by wet and dry deposition. J. Geophys. Res. 90, 2391-2408.

    Arimoto, R., Duce, R. A. and Ray, B. J. 1989. Concentrations, sources and air-sea exchange of trace elements in the atmosphere over the Pacific Ocean. In: Chemical oceanography, vol. 10 (ed. J. P. Riley, R. Chester and R. A. Duce). Academic, San Diego, Calif., 107-149.

    Arimoto, R., Gao, Y., Duce, R. A., Lee, D. S. and Chen, L. Q. 1990. International Conference on Global and regional environmental atmospheric chemistry, Preceedings. (ed. L. Newman, W. Wang and C. S. Kiang), US Dept. of Energy, 24-40.

    Betzer, P. R., Carder, K. L, Duce, R. A., Merrill, J. T., Tindale, N. W., Uematsu, M., Costello, D. K., Young, R. W., Feely, R. A., Breland, J. A., Bernstein, R. E., and M Greco, A. 1988. Long-range transport of giant mineral aerosol particles, Nature 336, 568-571.

    Blank, M., Leinen, M. and Prospero, J. M. 1985. Major Asian inputs indicated by the mineralogy of aerosols and sediments in the western North Pacific. Nature 314, 84-86.

    Bruland, K. Orians, K. J. J. P. Cowen, 1994. Reactive trace metals in the stratified central North Pacific. Geochim. Cosmochim. Acta 58, 3171-3182.

  • Metrics
    No metrics available
Share - Bookmark