Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events

摘要: Abstract. Aerosol particles, including airborne microorganisms, are transported through the free troposphere from Asian continental area to downwind in East Asia and can influence climate changes, ecosystem dynamics, human health. However, variations present bacterial communities over areas poorly understood, there few studies that provide an in-depth examination of effects long-range transport aerosols (natural anthropogenic particles) on variations. In this study, vertical distributions at high altitudes were investigated compared between dust events non-dust events. Aerosols collected three ground level (upper level: 3000 or 2500 m; middle 1200 500 m; low 10 m) during Noto Peninsula, Japan, where westerly winds carry areas. During events, air masses by winds, laser imaging detection ranging (lidar) data indicated concentrations non-spherical suggesting dust-sand particles central desert regions Asia. The samples contained 10–100 times higher microscopic fluorescent optical particle counter (OPC) measured than lower amounts particles. Additionally, some showed relatively levels black carbon, which likely coasts. Moreover, microbial  >  1200 m increased 1. 2 × 106 6. 6 × 106 particles m−3. contrast, when disappeared, decreased slightly microbial-particle 6. 4 × 104 8. 9 × 105 particles m−3. High-throughput sequencing technology targeting 16S rRNA genes (16S rDNA) revealed (from 500 3000 m) exhibited diversities predominantly composed natural-sand/terrestrial bacteria, such as Bacillus members. periods, bacteria mainly anthropogenic/terrestrial (Actinobacteria), marine (Cyanobacteria Alphaproteobacteria), plant-associated (Gammaproteobacteria), shifted composition correspondence with origins meteorological conditions. structures suggested remarkable changes response mass sources, contributed increases community richness domination a taxa.