2004—2022年赤峰市气溶胶时空变化特征及气象影响因素分析

Analysis of spatiotemporal variation characteristics and meteorological influencing factors of aerosols in Chifeng City from 2004 to 2022

利用2004—2022年MODIS MAIAC高时空分辨率卫星遥感数据,分析赤峰市气溶胶光学厚度(AOD)时空变化特征。运用Theil-Sen Median趋势分析、Mann-Kendall检验法及Pearson相关系数法探讨了赤峰市气溶胶光学厚度的时空变化趋势及其与气象因子的相关性。结果表明:赤峰市AOD年均值在0.15~0.25之间,AOD低值区主要分布在西北高海拔地区,高值区主要分布在东南部低海拔地区。2004—2022年赤峰市AOD呈波动下降趋势。赤峰市AOD最低值在1月,最高值出现在7月。研究时段内,赤峰市AOD与月平均气温、月平均相对湿度呈显著性正相关关系,与月最大风速平均值的相关性较弱。

Based on the MODIS MAIAC high spatio-temporal resolution data,temporal and spatial variation characteristics of aerosol optical depth in Chifeng from 2004 to 2022 were discussed.The Theil-Sen Median trend analysis,Mann-Kendall test method and Pearson correlation coefficient method were used to analyze the temporal and spatial variation trend of AOD and the correlation between AOD and meteorological factors.The results showed that:The multi-year average AOD was mainly concentrated between 0.15 and 0.25.The low AOD values were mainly distributed in high-altitude regions of the northwest,while the high AOD values were primarily distributed in low-altitude regions of the southeast.From 2004 to 2022,the AOD in Chifeng City showed a fluctuating downward trend.The minimum value appeared in January,and the maximum value occurred in July.AOD was significantly positively correlated with monthly average temperature and monthly average relative humidity,but weakly correlated with the average monthly maximum wind speed.