Characteristics and Influencing Factors of the Microbial Concentration and Activity in Atmospheric Aerosols over the South China Sea  

作　　者：QI Jianhua YIN Yidan XIE Jiamin LI Mengzhe DING Xue LI Hongtao 

机构地区：[1]Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China [2]Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,China

出　　处：《Journal of Ocean University of China》2021年第2期257-270,共14页中国海洋大学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(NSFC)(No.41775148);the Fundamental Research Funds for the Central Universities(No.201762006);the Program for New Century Excellent Talents in University(No.NCET-13-0531);supported by the NSFC Open Research Cruise(Cruise no.NORC2015-05);funded by the Ship Time Sharing Project of the NSFC。

摘　　要：Oceans are important sources of microbes in atmospheric aerosols;however, information about the characteristics of airborne microbes and their influencing factors over oceans is lacking. Here we report the characteristics of the microbial abundance and activity in aerosols sampled near the sea surface over the South China Sea(SCS) from May to June 2016. The airborne microbial concentration range in the aerosols was 1.68?105 to 4.84?105 cells m-3 over the SCS, reflecting an average decrease of 40% – 54% over the SCS compared with that in the samples from the coastal region of Qingdao. About 63% – 76% of the airborne microbes occurred in coarse particles(> 2.1 ?m), with a variable size distribution over the SCS. The microbial activity range in aerosols, measured by the fluorescein diacetate(FDA) hydrolysis method, was 2.09 – 11.97 ng m-3 h-1 sodium fluorescein(SF) over the SCS, which was 15% – 79% lower than that over the coastal region. These values reflected a different spatial distribution over the SCS from that of the microbial concentration. Except for certain samples, all samples had 68% of the microbial activity occurring in coarse particles. Correlation analysis showed that the microbial abundance and activity were positively correlated with the aerosol, organic carbon(OC), and water-soluble organic carbon(WSOC) concentrations, indicating that the airborne microbes may be related to the reactions of certain water-soluble organic chemicals in the atmosphere. Moreover, the concentrations of airborne microbes were significantly negatively correlated with the horizontal offshore distance. The microbial concentration and activity were significantly correlated with wind speed.

关 键 词：microbes AEROSOLS microbial activity size distribution WSOC 

分 类 号：X145[环境科学与工程—环境科学] P73[天文地球—海洋科学]