Remote Sensing of Wind and Aerosol Profiles in the High Arctic
摘要
We present an investigation of the structure of the aerosol layer and wind profiles at Villum Research Station located at Station Nord in the high Arctic. Based on Doppler wind lidar observations between 40 and 200 m we found, that the annual wind roses indicate generally westerly winds veering by more than 30° between 40 and 200 m and the annually averaged mean wind speed is slowly increasing with height. However, we found that the individual wind speed profiles between 40 and 200 m could roughly be categorized into 5 groups. These are: (1) wind speed increases with altitude (35%); (2) wind speed decreases with altitude(7%); (3) the wind speed decreases from 40 m up to a minimum at about 100 m, above this minimum the wind speed increases (15%); (4) the wind speed increases from 40 m up to 100 m and thereafter decreases (14%); and (5) the wind profile did not fit into any of these groups (29%). From ceilometer measurements we also found that the aerosol layer has depths ≈100 m and at ≈230 m and few cases of depths between ≈100 and ≈230 m.