典型红壤农田区气溶胶浓度特征及其与降雨的关系

Characteristic of Aerosol Concentration and Its Relationship With Rainfall in a Typical Red Soil Agricultural Region

于2005—2006年,借助TH-150A采集器和微气象观测场对典型红壤区(鹰潭站)大气气溶胶总悬浮颗粒物(TSP)与降雨进行定点观测与采样分析,结果表明,2005—2006年研究区气溶胶TSP质量浓度为17.07～266.11μg·m-3,月均值分别为104.57和101.73μg·m-3,峰值分别出现在2005年的2月(201.71μg·m-3)和2006年的10月(266.11μg·m-3),最小值均出现在各年的5月,分别为29.76和17.07μg·m-3。2个年份间气溶胶浓度变化差别较大,这与气溶胶自身特性、气象因素及周边环境相关。邓肯差异分析表明,研究区大气气溶胶浓度与降雨量、降雨频率分别呈显著线性负相关(n=24,P=0.007;n=22,P=0.0002)。

To explore characteristic of aerosol mass concentration and its relationship with rainfall,atmospheric aerosols and rainfall were monitored and sampled for analysis with the aid of TH-150A instruments and the micro-meteorological observation station in a typical red soil region（Red Soil Ecological Experiment Station,Chinese Academy of Sciences,Yingtan City,Jiangxi Province,China） in 2005-2006.Results show that monthly aerosol mass concentrations ranged from 17.07 to 266.11 μg·m-3,monthly averaging 104.57 and 101.73 μg·m-3 in 2005 and 2006,respectively.It peaked in February 2005（201.71 μg·m-3） and October 2006（266.11 μg·m-3） and bottomed in May 2005 and 2006 being 29.76 and 17.07 μg·m-3,respectively.The aerosol mass concentrations of the two years differed rather greatly,which is closely related to the characteristic of aerosol mass per se,meteorological elements and surrounding environment.Duncan difference analysis of the findings show that the atmospheric aerosol mass concentration in the study region was negatively correlated with rainfall and rain frequency at a significant level（n = 24,P = 0.007;n = 22,P = 0.000 2）.