Impact of Asian dust events (ADE) on atmospheric bacterial communities was studied using both cultivation and culture-independent methods. In addition, size-segregated aerosol mass concentrations and their chemical compositions were measured and backward trajectory analysis was performed. During the days affected by ADE, culturable bacterial population levels showed significant positive correlations with total suspended particles (TSP) and particulate matter with aerodynamic diameter<10μm (PM10), whereas no significant correlation was found during non-Asian dust (NAD) days. Asian dust seemed to directly impact the airborne bacterial communities, as abrupt changes of denaturing gradient gel electrophoresis (DGGE)-band patterns and significant differences in the 16S rDNA clone library between ADE and NAD days were observed. In addition, the changes of DGGE patterns were in agreement with the shift of PM2.5 chemical composition, suggesting that the outdoor bacterial community was affected by the source and transport pathways of air masses. The isolation sources of clone libraries reflected the sampled air mass transport pathways, which were simulated by backward trajectories. The results of this study revealed that the airborne culturable bacterial concentration was significantly increased and the ambient bacterial community structure was abruptly changed during ADE.
Bibliographical noteFunding Information:
This study was partly supported by the grants for environmental disease research from the Seoul Metropolitan Government, Republic of Korea , 12-65-010 . One of the authors (YPKim) was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) ( No. 2010-0008005 and No. 2010-0001898 ).
- 16S rDNA clone library
- Ambient culturable bacteria
- Bacterial loading factor
- Principal component analysis