Arctic Aerosol Timing Analysis Based On MODIS Aerosol Products

Abstract

The Arctic has a unique geographical environment. In recent years, the Arctic has undergone major changes, including an increase in temperature, a decrease in the extent and thickness of sea ice, and the reasons for these changes have yet to be further studied. In the Arctic, aerosol is an important factor that causes the temperature and environmental change. The lack of ground-based observation data in the Arctic makes satellite remote sensing an effective means for aerosol monitoring.We first selected the C61 version of the MODIS Level2 10 KM aerosol product from 2000 to 2018 as the Arctic's aerosol monitoring data. Then the products Aerosol Optical Depth (AOD) was evaluated by 20 ground-based AERONET (AErosol RObotic NETwork) sites in the Arctic. Based on the data with high quality control, the monthly averaged AOD in the Arctic were analyzed. Results show that: 1. MODIS AOD is overestimated in the Arctic and requires quality control to obtain more reliable results; 2. The monthly averaged AOD in the Arctic region does not exceed 0.3 with maximum 0.25 and minimum 0.027, and the average monthly AOD value of 18 years is 0.111. Usually, AOD peaks in summer and has a valley in autumn and winter, but it rises in spring with the Arctic haze events.