Estimate of dust poleward transport efficiency using two spaceborne lidars.

Dust particles can travel long distance and impact air quality, radiation budget, biogeochemical cycles, and cloud properties in many ways. In this analysis, we use measurements from two spaceborne lidar instruments, CALIOP/CALIPSO and CATS/ISS, to estimate the magnitude and vertical distribution of dust particles using both extinction coefficient and depolarization ratio. The analysis focuses at two latitude bands, i.e. 40-50N and inside Arctic circle, where CATS and CALIOP has high temporal coverage, respectively. The 40-50N zonal band has several major poleward transport pathways, therefore aerosol distribution at those locations largely affects the loading of dust in the Arctic circle. By combination of those two sensors and meridian wind from MERRA-2, we estimate the seasonal transport efficiency of dust and other aerosols from mid-high latitude to the Arctic.