Permafrost by permafrost. Of this area slightly more than half is underlain by continuous permafrost, around 20 percent by discontinuous permafrost, and a little less than 30 percent by sporadic permafrost. Most of this area is found in Siberia, northern Canada, Alaska and Greenland. Beneath the active layer annual temperature swings of permafrost become smaller with depth. The deepest depth of permafrost occurs where geothermal heat maintains a temperature above freezing. Above that bottom limit there may be permafrost, whose temperature doesn't change annually—"isothermal permafrost". Permafrost typically forms in any climate where the mean annual air temperature is less than the
Melnikov Permafrost Institute opened in 2012. Melnikov Permafrost Institute Melnikov Permafrost Institute of the Siberian Branch of the Russian Academy of Science () is a research institute based in Yakutsk, Russia. It was founded in 1960. Method for Determining Air Content in Frozen Soil, Method and Apparatus for Determining Volume and Density of Soil Particles, Apparatus for Heat Exchange of Liquids and Gases, Method for Determining Frost Heave during Active Layer Freezeback, Pile for Permafrost, Device for Cooling Permafrost Soils, Method for Production of a Pile Foundation for Permafrost, Device for Stabilization of Indoor Temperature and other. Cryo-storage of seeds of rare and