极地与海洋边界层大气微生物含量 种类和粒径分布及其影响因素-species and particle size distribution of atmospheric microorganisms in polar and marine boundary layers and their influencing factors.docxVIP

Abstractaverage value of 102.47 CFU/m3 and change largely with coefficient of variation at1.73. There was higher proportion of fine particle than that in other region. In some sample location, the microorganisms, less than 1.0 μm in diameter, was up to 50%. The dominance species were Bacillus genus (circulaus, firmus, subtilis and alvei) and Deinococcus genus (grandis and murrayi). The distribution of microbial in flocating sea ice region was found to be obviously impacted by the melting of sea ice.In the Northwestern Pacific Ocean, the abundance of microbial changes significantly with the temperature. This region was close to the Asian mainland, and the affect of terrestrial microbes was obvious. When the marine boundary layer was mainly affected by the air-mass from continent, the ratio of terrestrial microbes was higher up to 60%. The microbes were mainly composed by coarse size particle of terrestrial microbes. This phenomenon was more obvious in lower latitude.In the Pacific Ocean and Southern Ocean, the subgroup microbe of marine source has significantly high proportion (60% -80%) and was relatively stable (coefficient of variation 0.87). The microbes in the Pacific Ocean (71 CFU/m3 -147 CFU/m3) were slightly higher than that in the Southern Ocean (56 CFU/m3 - 112 CFU/m3).The amount of microorganisms in the Antarctic inland was very scarce, ranging from 2 CFU/m3 to 24 CFU/m3, and showing random of size distribution.5. The abundance of microbes was potentially impacted by the air mass and meteorological conditions.The impact of airborne meteorological conditions included temperature, precipitation, and UV radiation aspects etc. When the temperatures in ambient air decreased with the increasing latitude, the abundance of microorganisms was correspondingly found to decrease. The role of precipitation including rain or snow was to wash out of micro-organisms. While UV radiation has a significant role in the high latitude region. The rate of species with UV tolera