荒漠绿洲边缘凝结水量及其影响因子

Study of the Condensation Water and Its Effect Factors on the Fringes of Desert Oasis

以2004年7～10月在临泽内陆河流域综合研究站凝结水试验观测数据为基础,讨论了荒漠绿洲边缘凝结水凝结过程、不同下垫面凝结量及其影响因子.结果表明:荒漠绿洲边缘凝结水以吸湿凝结为主,北京时间16:00～18:00开始,至次日7:00～8:00结束.凝结开始的时间受控于沙地含水量,凝结量则主要受近地表相对湿度、近地表气温以及气温日较差三方面因素的影响.人工草地、平坦无植被沙地、沙丘顶部、丘间低地和人工林地在7～10月的平均月凝结量分别为:5.1 mm、4.0 mm、3.1 mm、1.8 mm和1.0 mm.

Measurement of condensation water was carried out on five different underlying surfaces around an artificial oasis in the arid region of China, from July to October in 2004. In this paper, not only the formation process of condensation is analyzed in detail, but also the main effect factors concerning the amount of condensation water are discussed. The results indicate that hygroscopic condensation is the dominate one in the desert oasis, which begins at 16.00-18：00 and ends at 7：00-8：00. Sand water content is the key factor determining whether condensation occurs, but the process of condensation is controlled chiefly by relative humidity and air temperature. Moreover, the daily range of temperature can also affect the condensation amount partly. In the artificial forest, artificial grassland, plain sand without vegetation, up-dune and inter-dune, the monthly mean condensation water is 5.1 mm, 4.0 mm, 3.1 mm, 1.8 mm and 1.0 mm, respectively.