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-alti-tude 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 corre-lated with monthly average temperature and monthly average relative humidity,but weakly correlated with the average monthly maximum wind speed.
Aerosol optical depthMODIS MAIACSpatial-temporal distributionChifeng City
NETL
NSTL
万方数据
