论文部分内容阅读
根据中国古湖泊数据库提供的湖泊水量空间信息和系统分析，发现我国西部地区在末次盛冰期（ＬＧＭ）时期存在着湖面比现代高、面积比现代大、水质体比现代淡化的湖泊．这与中国中、东部的低湖面或干枯湖盆有着巨大的反差．这些高湖面与中亚和地中海地区的高湖面连成一带，但南与印度中南部的低湖面、北与中西伯利亚若干个低湖面皆形成反差．根据国际古气候模型对ＬＧＭ时期模拟，我国西部地区有效降水有所增加，变化幅度７０～９５ ｍｍ／ａ．模型揭示了西风带不仅位置向南移动，其强度也有所增强，影响范围东扩．同时表明欧亚大陆降温幅度在４～１６℃，地表蒸发能力极弱，有利于在我国西部形成相对冷湿气候．
Based on the spatial information and systematic analysis of lake water volume provided by China Ancient Lake Database, it is found that in the last glacial period (LGM), there are lakes with high lake area, modern area and modern water body compared with the modern one. This is a huge contrast with the low lake or dry lakes in the central and eastern parts of China. These high lakes are connected with the high lakes of Central Asia and the Mediterranean Sea. However, the southern lakes of central and southern India are different from the low lakes of northern and central Siberia. According to the model of the international paleoclimatic model for the LGM simulation, the effective precipitation in western China has been increased by 70-95 mm / a. The model reveals that the westerly belt not only moves southward, but also increases its intensity and eastward expansion. At the same time, it shows that the cooling rate of Eurasia is between 4 and 16 ℃, and the surface evaporation capacity is extremely weak, which is favorable for the formation of a relatively cold and humid climate in western China.