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The Tibetan plateau is covered by hundreds of larger and smaller lakes. Until recently there was no method to monitor their waterlevel variations due to lack of in-situ measurements or unfitness of available remote sensing methods. However the ICESat/GLA14laser altimetry data provide global surface elevations for land during 18 one-month campaigns between 2003 and 2009. This productcould be used to accurately monitor water level variations and to estimate annual water level trends of about 150 Tibetan lakes.Based on the ICESat campaign schedule, lake levels derived from the GLA14 data are classified into three groups referenced to theTibetan seasons: late dry, early wet, and early dry. For each lake sampled by sufficient ICESat campaigns, seasonal water leveltrends could be estimated and inter-seasonal lake level variations could be determined. The results indicate that most of the southernTibetan lakes have a downward seasonal trend while most lakes elsewhere in Tibet have a positive seasonal trend. This means thatthese seasonal trends are similar to the annual trends. Moreover, lake level variations between seasons are much larger in the souththan in the north and the west of Tibet. Based on the spatial pattern of the lakes, the Tibetan plateau is divided into four sub-areascorresponding to seasonal lake level trends and inter-seasonal lake level variations. The results confirm climatic trends as discussedin meteorological literature. Therefore, this analysis is expected to improve the understanding of the limnological processes on theTibetan plateau and their impacts on the surrounding regions

SEASONAL TRENDS IN TIBETAN LAKE LEVEL CHANGES AS OBSERVED BY ICESAT LASER ALTIMETRY