Field studies on mixing state of dust and bioaerosol at desert areas : Direct sampling with balloon-borne instruments

塔克拉玛干沙漠大气中约有10%的沙尘粒子具有沙尘和生物气溶胶的内部混合状态，这一观测事实表明，在KOSA事件中检测到的大气生物气溶胶最初是从沙尘源区经西风输送来的。诺托半岛的测量结果表明，KOSA事件期间大气生物气溶胶含量明显增加，证实了生物气溶胶与KOSA粒子一起在大气中输送。冬季在塔特山峰附近积聚的雪层中检测到生物气溶胶，这也表明KOSA源区生物气溶胶可能是远距离输送和全球扩散的。

About 10% of dust particles had internal mixing state of dust and bioaerosols on the basis of the field measurements made in the atmosphere at Taklamakan desert, and this observational fact suggested that atmospheric bioaerosols detected in KOSA episode were originally transported from dust source areas by westerly.The measurements at NOTO peninsula showed clear increase in content of atmospheric bioaerosols during KOSA episode, and confirmed that bioaerosols were transported with KOSA particles in the atmosphere.Bioaerosols have been detected in the dust layers in the snow layer which accumulated near the summit of Mt.Tateyama during winter, and also suggest the possible long range transport and global diffusion of bioaerosols from KOSA source regions.