TY - JOUR N2 - Atmospheric gases and chemical impurities can be stored and chemically transformed in the tropospheric ice. Impurities are rejected during freezing of the ice to the grain boundaries, free ice surfaces or inclusions. Surface snow and tropospheric ice, however, may be exposed to high temperatures and, eventually, the gases and chemical impurities can be released into the environment. It is important to study the surface structure and transport mechanisms at temperatures near the melting point because the location of impurities and their interactions with water molecules in the ice are not yet sufficiently explained. In this work, the evolution of a scratch on the bicrystalline ice surface was studied at −5 ℃. The surface transport mechanisms near the melting point were studied and, as a consequence, the surface structure could be determined. An ice sample was kept immersed in ultra-pure silicone oil to prevent evaporation and, thus, isolate the effect of surface diffusion. The ice sample was made with water with chemical conditions similar to the water of polar ice sheets. Photographs of the scratch were taken periodically, for approximately 50 hours, using a photographic camera coupled to an optical microscope. From these images, the evolution of the width of the scratch was studied and the surface diffusion was the dominant transport mechanism in the experiment. Finally, the ice surface self-diffusion coefficient at −5 ℃ was determined and it was very similar to the super-cooled water diffusion coefficient. A liquid-like behavior of ice surfaces near the melting point was found and it could have a strong influence on the reaction rates with atmospheric gases. L1 - http://journals.pan.pl/Content/120127/PDF/2021-04-PPR-02-Varela-etal.pdf L2 - http://journals.pan.pl/Content/120127 PY - 2021 IS - No 4 EP - 237–248 DO - 10.24425/ppr.2021.137144 KW - ice self-diffusion coefficient KW - air-ice interaction KW - quasi-liquid layer KW - surface transport mechanisms A1 - Varela, Guillermo Aguirre A1 - Di Prinzio, Carlos L. A1 - Stoler, Damián PB - Polish Academy of Sciences PB - Committee on Polar Research VL - vol. 42 DA - 2021.07.01 T1 - Ice surface near melting point: Effects on the tropospheric ice SP - 237–248 UR - http://journals.pan.pl/dlibra/publication/edition/120127 T2 - Polish Polar Research ER -