北京西山国家森林公园中空气负离子浓度与气象因子的相关性研究

空气负离子(Negative air ions,NAI)是城市空气质量的重要指标之一,揭示城市森林释放NAI的影响机制,有助于充分利用NAI的净化作用及保健作用,并判断空气质量.利用北京西山国家森林公园2017年9月—2018年8月的NAI和气象数据,深入探究不同季节条件下和典型天气下影响空气负离子浓度(NAIC)的气...

Correlation between Air Anion Concentration and Meteorological Factors in Beijing Xishan National Forest Park

With the constant improvement of living standard of residents in our country, demands of urban residents for city ecological environment, particularly air quality are increasing. Negative air ion(NAI) is one of the important indicators of urban air quality. Therefore, to reveal the mechanism of NAI release of urban forests can help further understand NAI, make full use of the purification effect of negative ions and health care effect, and determine the air quality. Using NAI and meteorological data of monitoring station at Xishan National Forest Park in Beijing from September 2017 to August 2018, this study explores the important meteorological factors influencing NAI concentration(NAIC) under different typical seasonal and weather conditions. The results show that:(1) The correlation between NAI and meteorological factors was different in different seasons. When the temperature was above 15 ℃, the NAIC was negatively correlated with the temperature. While when below 15 ℃, the NAIC was positively correlated with temperature. In most cases, NAIC was negatively correlated with humidity, with the strongest negative effect in winter(r=-0.503, P<0.01). The NAIC in spring, autumn and winter had significant positive correlation with solar radiation and air pressure, while the NAI in summer had a negative correlation with the above two factors.(2) In days with typical weather(rainy, haze, windy and breezy), NAIC in urban forest is different from that in sunny days, and its correlation with meteorological factors also performs differently. The daily average NAIC in rainy days was 2 134 ion·cm^-3, 4.56% higher than the NAIC in sunny days, which was mainly due to the combined effect of temperature and rainfall. In winter, there were 2 075 ion·cm^-3 in sunny days but only 1 948 ion·cm^-3 in haze days, which were mainly influenced by the solar radiation;NAIC peaks in windy weather were 5.37% higher than in breezy weather, and the daily average was also higher than in breezy weather, mainly due to pressure difference.