A super Asian dust storm over the East and South China Seas: Disproportionate dust deposition

Shih Chieh Hsu, Fujung Tsai, Fei Jan Lin, Wei Nai Chen, Fuh Kwo Shiah, Jr Chuan Huang, Chuen Yu Chan, Chung Chi Chen, Tsun Hsien Liu, Hung Yu Chen, Chun Mao Tseng, Gwo Wei Hung, Chao Hao Huang, Shuen Hsin Lin, Yi Tang Huang

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Abstract

A super Asian dust (SAD) storm that originated from North China has affected East Asia since 20 March 2010. The tempo-spatial and size distributions of aerosol Al, a tracer of wind-blown dust, were measured on a regional aerosol network in March 2010. Two dust events were recorded: the SAD and a relatively moderate AD event. The SAD clouds raised Al concentrations to ~50 μg/m 3 on 21 and 22 March over the East China Sea (ECS) and occupied there for ~5 days. The SAD plume also stretched toward the South China Sea (SCS) on 21 March however, it caused a maximum Al concentration of ~8.5 μg/m 3 only, much lower than that observed in the ECS. In comparison, a weaker dust plume on 16 March caused Al maximum of ~4 μg/m3 over the ECS, and comparably, ~3 μg/m3 in the SCS. Dry dust deposition was measured during the peak phase of the SAD at 178 mg/m2/d, which corresponded to dry deposition velocities of 0.2-0.6 cm/s only, much lower than the commonly adopted one (1-2 cm/s). The corresponding increase in dust deposition by the SAD was up to a factor of ~12, which was, however, considerably disproportionate to the increase in dust concentration (i.e., the factor of over 100). In certain cases, synoptic atmospheric conditions appear to be more important in regulating dust contribution to the SCS than the strength of AD storms. Key Points A super Asian dust observed on a regional aerosol network over the ocean Increase in dust deposition is disproportionate to that in dust concentration Synoptic weather conditions play a critical role in AD transport to the SCS

Original languageEnglish
Pages (from-to)7169-7181
Number of pages13
JournalJournal of Geophysical Research Atmospheres
Volume118
Issue number13
DOIs
Publication statusPublished - 2013 Jul 16

Keywords

  • Asian dust
  • East China Sea
  • South China Sea
  • dust deposition
  • dust iron
  • long-range transport

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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  • Cite this

    Hsu, S. C., Tsai, F., Lin, F. J., Chen, W. N., Shiah, F. K., Huang, J. C., Chan, C. Y., Chen, C. C., Liu, T. H., Chen, H. Y., Tseng, C. M., Hung, G. W., Huang, C. H., Lin, S. H., & Huang, Y. T. (2013). A super Asian dust storm over the East and South China Seas: Disproportionate dust deposition. Journal of Geophysical Research Atmospheres, 118(13), 7169-7181. https://doi.org/10.1002/jgrd.50405