Monitoring lake level changes on the Tibetan Plateau using ICESat altimetry data (2003–2009)

• Published in: Remote sensing of environment Vol. 115; no. 7; pp. 1733 - 1742
• Main Authors: Zhang, Guoqing, Xie, Hongjie, Kang, Shichang, Yi, Donghui, Ackley, Stephen F.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Inc 15-07-2011; Elsevier
• Subjects: Altimeters; Altimetry; Animal, plant and microbial ecology; Applied geophysics; Biological and medical sciences; Earth sciences; Earth, ocean, space; Elevation; Exact sciences and technology; Footprints; Freshwater; Fundamental and applied biological sciences. Psychology; General aspects. Techniques; Glacier melting; Glaciers; ICESat; Internal geophysics; Lake level; Lakes; Melting; Salt lake; Salt lakes; Teledetection and vegetation maps; Tibetan Plateau; Far East; Asia; China; China, People's Rep., Xizang, Tibetan Plateau; Lake level; Tibetan Plateau; ICESat; Salt lake; Glacier melting; glaciers; salt lakes; data; Support; Increase; melting; baseline; monitoring; 2009; acceleration; Water level; global warming; Geographic distribution; 2003; global change; altimetry; climate change
• ISSN: 0034-4257; 1879-0704
• DOI: 10.1016/j.rse.2011.03.005

In this study, ICESat altimetry data are used to provide precise lake elevations of the Tibetan Plateau (TP) during the period of 2003–2009. Among the 261 lakes examined ICESat data are available on 111 lakes: 74 lakes with ICESat footprints for 4–7
years and 37 lakes with footprints for 1–3
years. This is the first time that precise lake elevation data are provided for the 111 lakes. Those ICESat elevation data can be used as baselines for future changes in lake levels as well as for changes during the 2003–2009 period. It is found that in the 74 lakes (56 salt lakes) examined, 62 (i.e. 84%) of all lakes and 50 (i.e. 89%) of the salt lakes show tendency of lake level increase. The mean lake water level increase rate is 0.23
m/year for the 56 salt lakes and 0.27
m/year for the 50 salt lakes of water level increase. The largest lake level increase rate (0.80
m/year) found in this study is the lake Cedo Caka. The 74 lakes are grouped into four subareas based on geographical locations and change tendencies in lake levels. Three of the four subareas show increased lake levels. The mean lake level change rates for subareas I, II, III, IV, and the entire TP are 0.12, 0.26, 0.19, −0.11, and 0.2
m/year, respectively. These recent increases in lake level, particularly for a high percentage of salt lakes, supports accelerated glacier melting due to global warming as the most likely cause.
► ICESat data are used to examine 111 lakes in Tibetan Plateau (TP) for lake level. ► 84% of all lakes and 89% of the salt lakes show tendency of lake level increase. ► The largest lake level increase (0.80
m/year) is the lake Cedo Caka. ► Increase in lake level is in consistent with the accelerated glacier melting in TP.