Abstract
This paper focuses on the research progress of the negative air ion concentration distribution characteristics and its correlation with meteorological elements in mountain tourist areas for recent decades in China. Many researches showed that the distribution of negative air ion in mountain tourist areas has obvious daily and seasonal variations, and its space changes also have regularity. In a day, the NAI concentration will appear alternately with peaks and troughs. The changes of NAI concentration are the summer, autumn high, winter and spring low, the highest in summer, the lowest in winter. In the middle and low altitude areas, NAI concentration is positively correlated with elevation, and negative correlation in high altitude. The concentration of NAI is related to wind speed, air humidity, air temperature, solar radiation, weather conditions, and other meteorological elements. Most research results show that humidity is the most important meteorological factor affecting NAI concentration. The NAI concentration in mountainous scenic spots is significantly positively correlated with relative humidity and rainfall intensity, positively correlated with wind speed and solar radiation, negatively correlated with air temperature. However, due to different sources of monitoring data, observations difference in time, different sample size and other elements, the conclusions on negative air ion concentration distribution characteristics and its correlation with the meteorological factors are not entirely consistent. Negative air ion monitoring equipment should be gradually standardize to ensure the reliability of monitoring data in the future, while we should take advantage of years of continuous observations to carry the study of correlation between negative air ion and meteorological factors, and this will provide a theoretical basis for negative air ion concentration forecasts.
Highlights
Negative air ions (NAI) are the general names of negatively charged single gas molecules and light ion clusters in the atmosphere, and are conventionally referred to as “negative oxygen ion” in China
The results showed that the NAI concentration and the daily total amount of solar radiation showed a very significant linear positive correlation, and the daily total amount of solar radiation increased by 1 MJ·m-2, and the NAI concentration increased by 30·cm-3
Most research results show that humidity is the most important meteorological factor affecting NAI concentration
Summary
Negative air ions (NAI) are the general names of negatively charged single gas molecules and light ion clusters in the atmosphere, and are conventionally referred to as “negative oxygen ion” in China. The meteorological department has incorporated air negative ions into the meteorological monitoring system, and some provinces and cities have conducted air anion meteorological services for urban and mountainous scenic spots. Forests are mostly grown in mountain regions, and there are more radioactive substances in mountain rocks; especially ultraviolet rays and cosmic rays are strong on high mountains; The photoelectric effect occurs when sunlight reaches the branches and leaves of forest plants; loose soil under mountain forests, rocks and soils Radioactive elements escape the soil and enter the air [2]; in addition, the flow of water, such as waterfalls and streams, is relatively large in forest environment. Due to high forest cover rate, the NAI concentration of Mountain scenic spots is much higher than urban, and the annual average is several thousand to tens of thousands per cubic centimeter [7,8,9,10,11,12,13,14,15]. Many domestic scholars have shown that the NAI concentration distribution in mountain tourist areas has obvious time variations and a certain spatial distribution pattern
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