Spatial and Temporal Distribution Characteristics of AOD and Influence of Meteorological Factors in Qaidam Basin

Abstract

Based on the MODIS MCD19A2 aerosol dataset， the temporal and spatial distribution characteristics of the atmospheric aerosol optical thickness （AOD） and the influence of meteorological factors in the Qaidam Basin from 2001 to 2021 were investigated by using linear trend， Spearman correlation analysis， and Ångström exponential interpolation， and the results show that： （1） On the interannual scale， the AOD in the Qaidam Basin fluctuates upward， with an annual increase of 3.74% and an annual mean value of 0.110±0.002； on the seasonal scale， AOD has obvious seasonal changes， and its value from high to low is spring， summer， autumn and winter， respectively.AOD in spring and summer fluctuates， while AOD in autumn and winter has no obvious change.on the monthly scale， the AOD is in the shape of a single peak， and the peak value is in April.（2） In space， the high value area of AOD is located in the hinterland of Qaidam Basin， showing the distribution characteristics of high in the middle and low around， and the low value area is located in the high altitude areas such as Kunlun Mountain Range and Qilian Mountain Range and the area with high vegetation cover.（3） Meteorological factors have a certain influence on AOD， among which wind speed， temperature， relative humidity， cloudiness and precipitation are positively correlated with AOD， and wind speed and temperature have the greatest influence on AOD.

Keywords

• aod
• spatial and temporal distribution
• case analysis
• meteorological elements
• qaidam basin