Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The nature of individual solid particles retained in size-resolved raindrops fallen in Asian dust storm event during ACE-Asia
AbstractTo determine the physicochemical properties of individual solid particles retained in raindrops, the size-segregated raindrop sampling was carried out at ground-based site in Kyoto, Japan in Asian dust storm event during ACE-Asia. For the analysis of elemental components in individual solid particles, X-ray fluorescence microprobe system installed at Super Photon ring 8GeV (SPring-8) BL-37XU was applied. Consequently interraindrop data of individual solid particles that are present inside the raindrops could be obtained. The number size distribution of individual solid particles scavenged by each raindrop size was compared to the calculated particle-scavenging coefficient (E). There was a good agreement between the calculated scavenging coefficient for particles and the measured number size distribution of particles with radius 1μm. Elemental mass showing the peak at raindrops collected on 0.7mm mesh size was varied as a function of raindrop size. The masses of crustal components and chlorine show significantly high level regardless of raindrop size. Individual residual particles were successfully classified into several factors as a function of raindrop size. The hygroscopic portions for S, Cl, K, and Ca in individual particles retained in size-segregated raindrop were determined. The mixed particles with crustal and sea-salt accounted for large fraction of particles retained in small raindrops. Whereas, in the case of large raindrops, the mixed residual particles with crustal and sulfur contributed to large portion. The results obtained from our study indicate that a large number of dust particles were incorporated into cloud droplets during their long-range transport and dust particles were effectively washed out by raindrops during rainfall event.
The nature of individual solid particles retained in size-resolved raindrops fallen in Asian dust storm event during ACE-Asia
AbstractTo determine the physicochemical properties of individual solid particles retained in raindrops, the size-segregated raindrop sampling was carried out at ground-based site in Kyoto, Japan in Asian dust storm event during ACE-Asia. For the analysis of elemental components in individual solid particles, X-ray fluorescence microprobe system installed at Super Photon ring 8GeV (SPring-8) BL-37XU was applied. Consequently interraindrop data of individual solid particles that are present inside the raindrops could be obtained. The number size distribution of individual solid particles scavenged by each raindrop size was compared to the calculated particle-scavenging coefficient (E). There was a good agreement between the calculated scavenging coefficient for particles and the measured number size distribution of particles with radius 1μm. Elemental mass showing the peak at raindrops collected on 0.7mm mesh size was varied as a function of raindrop size. The masses of crustal components and chlorine show significantly high level regardless of raindrop size. Individual residual particles were successfully classified into several factors as a function of raindrop size. The hygroscopic portions for S, Cl, K, and Ca in individual particles retained in size-segregated raindrop were determined. The mixed particles with crustal and sea-salt accounted for large fraction of particles retained in small raindrops. Whereas, in the case of large raindrops, the mixed residual particles with crustal and sulfur contributed to large portion. The results obtained from our study indicate that a large number of dust particles were incorporated into cloud droplets during their long-range transport and dust particles were effectively washed out by raindrops during rainfall event.
The nature of individual solid particles retained in size-resolved raindrops fallen in Asian dust storm event during ACE-Asia
Ma, Chang-Jin (Autor:in) / Tohno, Susumu (Autor:in) / Kasahara, Mikio (Autor:in) / Hayakawa, Shinjiro (Autor:in)
Atmospheric Environment ; 38 ; 2951-2964
05.03.2004
14 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch