The observation of sea-ice in the six Chinese national arctic expedition using polar-ARV

In July of 2014, the Pole-ARV participated in the 6th Chinese National Arctic Research Expedition (CHINARE) for the third time after improved. On the long-term ice station of the 6th CHINARE at north latitude 81 degrees, Pole-ARV worked 7 days and navigated a total of 9 kilometers under ice. It accomplished the survey of the observed area three times in different weather conditions, and got a lot of data, such as ice thickness and spectral irradiance. Through these observed data, the spatial variety of solar radiation energy absorbed by sea-ice could be measured continuously, and the roughness of ice bottom was reflected. This paper mainly describes the application of Polar-ARV in the 6th CHINARE and the results of observation under ice.