superfrost

plural superfrosts

1. countablerareuncountableGroundwater that is found immediately above the permafrost layer, which seasonally thaws, but is kept frozen more of the year due to the cold from the permafrost layer.

   Depending on frost conditions, groundwater may be grouped in three classes: superfrost, interfrost and subfrost.

   2017, A.L. Goldin, Design of Earth Dams, CRC Press, →ISBN

   2 more examples

   In the same category, one encompasses waters of multi-yearly superfrost talics, which exist thanks to the thermal effect of surface waters. The water of the active layer occurs on permafrost soil, which makes up the water confining basement, and propagate in lower forms of topography and on large divide areas or slopes.

   1993, A. M. Galperin, Anatoliĭ Moiseevich Galʹperin, V. S. Zaytsev, Yu. A. Norvatov, Aleksandrovich Norvatov, Hydrogeology and Engineering Geology: Geotechnika - Selected Translations of Russian Geotechnical Literature 8, Taylor & Francis, →ISBN, page 67

   The distribution of species across the tundra may be explained by the similar humidity regime across all sites (hyperhumidity). High humidity of all types of tundra soil results from low evaporation and a high level of superfrost in tundra.

   1998, Proceedings RMRS., Rocky Mountain Research Station, page 51

2. countableuncountableAn exceptionally severe frost.

   Unprecedented solar flares bombard the earth. The planet's magnetic field vanishes. Raging down the glacier valleys from the polar plateau, the Katabatic winds unleash Condition One: blizzard, superfrost and white outs.

   1982, Crawford Kilian, Icequake, Berkley Books, →ISBN, page 275