The impact of mountainous skirts direction of Iran on differences in altitude of water and ice equilibrium line of quaternary

One of the factors influencing the altitude of water and ice equilibrium line is the amount ofthe energy received from sun which depends on the radiation angles of sun and the slope. thus,as the surfaces slopes vary , the absorption of energy will also change. initially, this article makesan attempt to measure the radiation angle and the energy absorbed daily by the surface of landwith respect to different slopes and directions. then, the differences between the amounts ofenergy absorbed by two different surfaces varying in terms of slope and direction will beestimated, considering a constant temperature. consequently, the energy differences will beconverted to altitude differences, using the statistical relations. this paves the way for theestimation of the differences in altitude of water and ice equilibrium line. although this articlehas used a hypothetical altitude, the resulting finding can also be used in the context of the pastages because the altitude of water and ice equilibrium line was low at the ice age of quaternary.this study had the following findings; 1- averaged reduction of temperature of environment is.48 per 100 meters increas ing in height with reduction of temperature in iran about 5-12 dc inquaternary period height of snow is downer about 1042-2500 then current circumstance. 2- thehighest impact of the land surfaces directions on the altitude of ice and water equilibrium linecan be seen in the skirts whose mountainous ridges expansion is west and east. 3- the northsouthexpansion of mountainous ridges doesn't have any effect on the difference in altitude ofice and water equilibrium line