ice penetrates into the ice as is absorbed according to Beer's law. Optical properties are defined by the parameters emissivity_ice, emissivity_snow, extinct, and penetr.</li>
<li>Boundflux_flag: 3 assumes the atmospheric heat flux is proportional to the difference between the top layer temperature and the air temperature.</li>
</ul>
<p>For 1 and 2 the surface temperature in turn determines the atmospheric heat flux into the snow or ice. Atmoflux_flag is important for boundflux_flag 2, as it determines whic