Abstract
Inland lakes are the major surface water resource in the arid regions of Central Asia. Therefore, the surface area changes in inland lakes have been a sensitive indicator of climate changes and human activities, and have often been the focus of ecological and environmental research. This study aimed to monitor the changes in surface area of nine major lakes over a 32-year period. The water body was extracted from MSS images from the mid-1970s, TM images from the early 1990s, ETM + images in the late 1990s, and TM images in 2007. The results indicated that the total surface area of these nine lakes had decreased over time to 50.38% of the area, from 91402.06 km2 in 1975 to 46049.23 km2 in 2007. As the surface area of lakes in the western part of Central Asia was larger than that in the eastern part, the shrinking trend of lake area was more significant in the west than in the east. There was a varied reduction of closed lakes in flat regions. The most substantial decrease was in the surface area of closed lakes in flat regions. Most significantly, the area of the Aral Sea was reduced by 75.7% from its original area in 1975. The area of alpine lakes remained relatively stable; the change in surface area was less than 0.7% during the period 1975–2007. The area change in opened lakes with outlets was notably different from the other two types. The area of Zaysan had increased sharply by 5.85%, and that of Bosten had decreased by 9.1%. Sasykkol had hardly any changes in this period. Due to global climate warming, vapor transfer to the south via westerly winds had been blocked, resulting in a decrease of much-needed precipitation in the western parts of Turkmenistan, Uzbekistan, and Kazakhstan between 1970 and 2000. The decrease in precipitation and the increase in water consumption for agricultural irrigation resulted in the decrease of river runoff. Consequently, the area of inland lakes in Central Asia shrank over the past 32 years.
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Jie BAI had got Ph.D. of cartography and geographic information system in Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. She is assistant research fellow in Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. Her areas of research include: information extraction of ecological and environmental factors based on remote sensing; Ecology modeling.
Xi CHEN graduated from Wuhan University with a Doctor degree of hydrology and water resources. He is director of Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, research fellow and doctoral tutor. His areas of research include: remote sensing and geographic information system, ecological environment, hydrology and water resources.
Liao YANG is senior engineer of Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, deputy director of research office for earth observation from space and system simulation and master’s tutor. His areas of research include: remote sensing and geographic information system.
Hui FANG is assistant research fellow and a Ph.D. candidate in Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences. Her areas of research include: geodatabase modeling and remote sensing.
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Bai, J., Chen, X., Yang, L. et al. Monitoring variations of inland lakes in the arid region of Central Asia. Front. Earth Sci. 6, 147–156 (2012). https://doi.org/10.1007/s11707-012-0316-0
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DOI: https://doi.org/10.1007/s11707-012-0316-0