湖北春季大气负氧离子浓度分布特征及与环境因子的关系

Spatial-Temporal Characteristics of Spring Air Negative Oxygen Ions and Its Relationship with Environmental Factors in Hubei

空气负氧离子浓度是衡量空气质量好坏的重要指标。选择湖北17个环境一致的国家气象观测站作为观测地点,采用符合国家及行业标准的设备,遵循负氧离子定义,开展了2014年湖北春季负氧离子浓度分布特征及与环境因子的关系分析。研究表明:湖北大气负氧离子浓度西部高于中东部,神农架林区的平均值最高,以武汉为中心的中、东部地区浓度普遍较低。负氧离子浓度的日变化为凌晨及清晨高,白天较低,傍晚后呈逐渐上升的趋势。负氧离子浓度与海拔、植被覆盖情况表现为正相关,与空气中的小颗粒物呈负相关,与气温、气压、相对湿度、风速及日照等气象要素相关性较为复杂,降水和雷电天气有利于负氧离子浓度的增加。

Negative oxygen concentration has become an important indicator to measure air quality.Choosing 17 national meteorological stations in Hubei on behalf of the observation stations with the same environment and using the equipment in line with national and industry standards,the spatial-temporal characteristics of the air negative oxygen ion from March to May in 2014 and its relationship with environmental and meteorological factors are analyzed following the definition of negative oxygen ion.The results show that negative oxygen concentration in the western Hubei is higher than that in middle-east,and the average concentration of the Shennongjia forest district is the highest,but it is low in Wuhan,the central of the middle-east.Over the span of a whole day,it is high early in the morning,but low during the day,and then it has a trend of rising in the evening.It is also reveals that the concentration correlates positively with altitude and vegetation coverage,and negatively with small particles in the air.However,the concentration has poor correlates with temperature,air pressure,relative humidity,speed,sunshine duration,and other meteorological factors.Besides,the precipitation and thunderstorm is favorable to the increase of negative oxygen ions.