標題: Multi-Decadal Monitoring of Lake Level Changes in the Qinghai-Tibet Plateau by the TOPEX/Poseidon-Family Altimeters: Climate Implication
作者: Hwang, Cheinway
Cheng, Yung-Sheng
Han, Jiancheng
Kao, Ricky
Huang, Chi-Yun
Wei, Shiang-Hung
Wang, Haihong
土木工程學系
Department of Civil Engineering
關鍵字: altimeter;El Nino;lake level;Qinghai;Tibet;TOPEX;Poseidon
公開日期: 1-Jun-2016
摘要: Lake levels in the Qinghai-Tibet Plateau (QTP) provide valuable records for climate change studies. We use two decades of measurements (January 1993-December 2014) from the TOPEX/Poseidon (T/P)-family satellite altimeters (T/P, Jason-1 and -2) to detect lake level variations at 23 lakes along their repeat ground tracks every 10 days. We employ an optimal processing technique to obtain quality measurements, including outlier detection, averaging and filtering. The lake level accuracies are improved by subwaveform retracking. Jason-1 delivers few measurements after waveform retracking and a cluster classification at most lakes. From January 1993 to December 2014, most lake levels in eastern Tibet rose, while those in western Tibet declined. In Qinghai, lake levels dropped before 2005 and then rose afterwards, coinciding with the measure in 2005 that protects the Qinghai ecosystem (e.g., grassland conservation). The overall pattern of lake level change in the QTP is largely affected by monsoons and lake locations. Most lake levels show clear annual and inter-annual oscillations. Certain lakes show alternating level highs and lows in the same seasons and varying amplitudes of annual oscillations due to lake level changes. We detect a sudden rise of lake level by 7 m caused by floods, varying lake level trends associated with the 199798 El Nino and other factors, and persistently rising and declining lake levels associated with the long-term precipitation trends in the QTP. The T/P-family satellites will continue to monitor lake levels here as long as the sea level monitoring program lasts, collecting a long-term climate record at highlands echoing sea level change.
URI: http://dx.doi.org/10.3390/rs8060446
http://hdl.handle.net/11536/134036
ISSN: 2072-4292
DOI: 10.3390/rs8060446
期刊: REMOTE SENSING
Volume: 8
Issue: 6
起始頁: 0
結束頁: 0
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