1974-2019年西藏羊卓雍错湖泊水位变化特征及其影响因素

Characteristics of the lake water level changes and influencing factors in Yamzhog Yumco in Tibet from 1974 to 2019

利用羊卓雍错1974-2019年水位、降水、蒸发和气温数据,分析了水位长期和年内变化特征及其原因。结果表明:羊卓雍错水位在1974-2019年波动下降。1974-1996年和2016-2019年影响水位变化的主因均是降水,1997-2015年的主因是包括人类活动在内的其他因素。1974-1996年,春季水位变化的主因是蒸发,其他季节均是降水。1997-2015年不同季节的主因均是其他因素。2016-2019年,影响春夏季的主因分别是蒸发和降水,秋冬季是气温。在当前气候变化趋势下,水位10年内将恢复2.0m。

The water level,evaporation,precipitation and temperature data of Yamzhog Yumco from 1974 to 2019 were used to analyze the long-term and seasonal water level variation characteristics and causes of Yamzhog Yumco in 1974-2019.The results show that the water level of the Yamzhog Yumco fluctuated down from 1974 to 2019.The main factor affecting water level changes from 1974 to 1996 and 2016 to 2019 was precipitation,and the main reason for 1997-2015 was other factors including human activities.During 1974-1996,the main factor affecting the spring water level change was evaporation,and the main factor in other seasons was precipitation.During 1997-2015,the main factor affecting water level changes in different seasons were other factors.During 2016-2019,the main factors affecting water level changes in spring and summer were evaporation and precipitation,respectively.In autumn and winter,the main factor was temperature.Under the current climate change trend,the water level might be restored 2.0 m in the next 10 years.