OCR Text |
Show in the laboratory [ e. g., de Quervain, { h\\ , few quantitative data have been published on formation rates. Assuming that the growth of depth hoar crystals depends directly on diffusional transfer, it should be possible to predict growth rate as a function of temperature and temperature gradients, vapor pressure of ice, and the diffusion coefficient of vapor in air. These quantities depend very much on climate, and consequently the climatic variations of this phenomenon should be amenable to explanation. It is the object of this report to consider the physical and climatic factors influencing constructive metamorph i sm. |