【摘要】 利用Landsat(MSS、TM、ETM+)系列卫星和环境减灾卫星CCD遥感影像数据以及西藏扎日南木错地区近40年(1970-2011年)气象资料,分析湖泊面积的变化特征,并探讨湖泊面积变化的可能气象成因.结果表明,扎日南木错1975-2011年间经历了先萎缩后扩张的过程,湖泊面积呈增长趋势,增长面积为7.08 km2.扎日南木错流域在过去40多年里冰川在退缩,温度升高,降水量增加,而蒸发量和最大冻土深度减少.湖泊面积与年气温之间有显著的正相关关系,气温升高可能是湖面扩大的原因之一.更多还原

【Abstract】 Based on Landsat( MSS,TM,ETM +) satellite series and Environmental Mitigation satellite data and the 40 years of meteorological data near the Thari Namtso of Tibet,we investigated the area change in the lake and the possible meteorlogical causes. Results show that the lake experienced decrease firstly and then increased 7. 08 km2 in the area during the period 1975-2011.The glacier retreats,both the temperature and rainfall saw upward trends,but evaporation and maximum depth of permafrost experienced downward trend in the watershed of Thari Namtso during the last 40 years. The causal effect analysis indicated that the area of Thari Namtso has linear relationship with annual mean temperature,that is,the area was positively associated with the annual temperature. Therefore,we infer that the increasing temperature is likely to be the main factor of lake expanding.更多还原