Nor (north-west of Lhasa). So intense is the cold in this part of Tibet that these springs are sometimes represented by columns of ice, the nearly boiling water having frozen in the act of ejection. Climate The climate of Tibet is severely dry nine months of the year, and average annual snowfall is only , due to the rain shadow effect. Western passes receive small amounts of fresh snow each year but remain traversible all year round. Low temperatures are prevalent throughout these western regions, where bleak desolation is unrelieved by any vegetation bigger than a low bush, and where the wind sweeps unchecked across vast expanses of arid plain. The Indian monsoon exerts some influence on eastern Tibet. Northern Tibet is subject to high temperatures in the summer and intense cold in the winter. Climate data The effects of climate change The Tibetan Plateau contains the world's third-largest store of ice. Qin Dahe, the former head of the China Meteorological Administration, said that the recent fast pace of melting and warmer temperatures will be good for agriculture and tourism in the short term; but issued a strong warning: "Temperatures are rising four times faster than elsewhere in China, and the Tibetan glaciers are retreating at a higher speed than in any other part of the world." "In the short term, this will cause lakes to expand and bring floods and mudflows." "In the long run, the glaciers are vital lifelines for Asian rivers, including the Indus and the Ganges. Once they vanish, water supplies in those regions will be in peril." Tibet during the last glacial period Today Tibet is the most essential heating surface of the atmosphere. During the Last glacial period a c. ice sheet covered the plateau. This glaciation took place in correspondence to a lowering of the snowline by . For the Last Glacial Maximum this means a depression of the average annual temperature by at a minor precipitation compared with that one of today. Owing to this drop in temperature a supposed drier climate has partly been compensated with regard to the glacier feeding by a minor evaporation and an increased relative humidity. Due to its great extension this glaciation in the subtropics was the most important climatically foreign element on earth. With an albedo about 80-90% this ice area of Tibet has reflected an at least 4 times greater global radiation energy per