Hygroscopic mineral dust particles as influenced by chlorine chemistry in the marine atmosphere

Yutaka Tobo*, Daizhou Zhang, Naonobu Nakata, Maromu Yamada, Hiroko Ogata, Kazutaka Hara, Yasunobu Iwasaka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Morphology and elemental compositions of individual dust particles were investigated with the use of Asian dust samples collected at a site along the Sea of Japan side of the archipelago. Our results indicate the preferential formation of chloride in Ca-containing dust particles (0.1 < Cl/Ca < 0.65) in cases when the particles contain little or no sulfate. Most of them are in an amorphous state and nearly spherical even under high vacuum. A likely explanation for the results is that highly soluble salts such as calcium chloride (CaCl2) are formed as a result of heterogeneous reactions of dust particles with chloride precursor gases (mostly, HCl) in the marine atmosphere. The chloride formation is expected to play an important role in enhancing the hygroscopicity of dust particles.

Original languageEnglish
Article numberL05817
JournalGeophysical Research Letters
Issue number5
Publication statusPublished - 2009 Mar 16
Externally publishedYes

ASJC Scopus subject areas

  • General Earth and Planetary Sciences
  • Geophysics


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