文献类型：期刊文献

英文题名：Temporal dynamics of negative air ion concentration and its relationship with environmental factors: Results from long-term on-site monitoring

作者：Li, Aibo[1,2] Li, Qiaoling[3] Zhou, Benzhi[1,2] Ge, Xiaogai[1,2] Cao, Yonghui[1,2]

第一作者：Li, Aibo

通信作者：Zhou, BZ[1];Zhou, BZ[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Zhejiang, Peoples R China;[2]Natl Forestry & Grassland Adm, Qianjiangyuan Forest Ecosyst Res Stn, Hangzhou 311400, Zhejiang, Peoples R China;[3]China Natl Bamboo Res Ctr, Hangzhou 310012, Zhejiang, Peoples R China

年份：2022

卷号：832

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20221511954496);Scopus(收录号：2-s2.0-85127742272);WOS:【SCI-EXPANDED(收录号:WOS:000793407400003)】；

基金：This study was funded by Fundamental Research Funds for the Central Non-profit Research Institution of Chinese Academy of Forestry (grant number CAFYBB2018ZA002) ; Key R&D Program of Zhejiang Province (grant number 2021C02005) ; Sci-Tech Cooperation Program between Zhejiang Province and Chinese Academy of Forestry (grant number 2020SY06) .

语种：英文

外文关键词：Negative air ion; Temporal dynamics; Air temperature; Relative humidity; Air quality

摘要：Negative air ions (NAIs) play an important role in evaluating forest health effects and promoting human physical and mental health. In this paper, long-term on-site monitoring of NAI concentration, air temperature, and relative humidity was conducted in real time over 24 h, from July 2019 to March 2021, to explore the temporal dynamic patterns of NAIs. We found that the daily dynamics of NAI concentration showed a bimodal curve. The peak concentrations usu-ally occurred in the early morning (5:00-7:00) and afternoon (15:00-17:00), and the lowest concentrations usually occurred at noon (11:00-13:00). At the monthly scale, NAI concentrations were relatively high in February and August and low in May and December, and at the seasonal scale, NAI concentration was significantly higher in summer than in other seasons. Autumn had the second highest NAI concentration. There was no significant difference in NAI concen-tration between winter and spring. A comprehensive analysis shows that the AQI was the most key factor affecting NAI concentrations compared to temperature and relative humidity, especially the two indicators of particulate matter and ozone, and that NAI concentration had a negative correlation with these indicators and was significantly higher under favorable air quality conditions than under polluted air conditions. NAI concentrations and air temperature showed marked piecewise characteristics, with NAIs increasing linearly with rising temperature only if the Ta was separated into three ranges of -5 degrees C-10 degrees C, 10 degrees C-30 degrees C, and 30 degrees C-40 degrees C. With rising relative humidity, NAI concentration increased in accordance with a quadratic function. Our research provides new insights into the NAI temporal dynamics patterns and its driving factors, and will aid in scheduling outdoor recreation and forest health activities for urban people.