Spatial-Temporal Characteristics of Negative Oxygen Ions in Liuhe Area and the Models of Their Interaction With Various Meteorological Factors
This paper takes three observation points of negative oxygen ions in Liuhe District,Nanjing Province as monitoring objects.The changes of negative oxygen ion concentration in different time scales and the effects of temperature and relative humidity on negative oxygen ion concentration were studied.The results are as follows:① The diurnal variation of negative oxygen ion content in Zhimaling shows a"Double Peak"pattern.The maxi-mum value appears from midnight to morning,afternoon to night,and the daily maximum value appears at 07:00.The daily lowest value appeared at 15:00.The negative oxygen ion concentration in Bashan was a regular"alterna-ting peaks and valleys"characteristic,with a peak value appearing every 4 hours during the day.The negative ox-ygen ion concentration in Jinniuhu is characterized by"Single peak",low from night to morning and high in the evening.The daily maximum value appears at 18:00,and the daily minimum value appears at 10:00.②The con-centration of negative oxygen ions in the Liuhe area increased from December to March and April,then decreased gradually.③ The concentration of negative oxygen ions in Zhimaling and Bashan is higher in winter and spring,and lower in summer and autumn,while Jinniuhu has the highest concentration in spring and the lowest in winter.④ The average annual concentration of negative oxygen ions at three sites are above 1500 per cubic centimeter,which meets the health standards for negative oxygen ion concentration in forest parks in China.⑤ Temperature and relative humidity only have a significant impact on the concentration of negative oxygen ions at Zhimaling Station in spring and throughout the year,while the effects of other stations and time periods are not yet clear and require further research.
negative oxygen ionsspatio-temporal variation characteristicsmeteorological factorsprediction model
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