The Changes of Lake Water Level on the Qinghai-Xizang Plateau Obtained by Combining Multi-Source Satellite Altimetry Data
The water level change series of lakes in the Qinghai-Xizang plateau from 2003 to 2022 are extracted using the data of ICESat,Cryosat-2 and ICESat-2.Taking Qinghai lake as an example,the three retracking algorithms of Cryosat-2 LRM(Ocean-CFI,UCL Land-ice and OCOG)are compared and analyzed,and the results show that OCOG algorithm is the best.The accuracy of the time series of lake water level changes extracted from satellite altimetry data is evaluated by using the hydrologi-cal station data of Qinghai lake,Nam Co,Mêmar Co and Lumaqangdong Co,and the results show that the RMS of the difference between the water level change time series of Qinghai lake and the measured results of Xiashe station is only 0.092 m,and the correlation coefficient between the water level change time series and the measured results of Nam Co is 0.989,and the accuracy analysis of dif-ferent measurement techniques in the same time period shows that the accuracy of the Cryosat-2 SA-RIn measurement mode is slightly higher than that of ICESat-2.The water level changes of 106 lakes in the Qinghai-Xizang plateau from 2003 to 2022 are extracted,and the water level change trend is an-alyzed,and the results show that the water level of 19 of the 106 lakes show a downward trend,and the water level of 83 lakes show an upward trend.
multi-source remote sensing datasatellite altimetryQinghai-Xizang plateauchanges of lake water level
万方数据
维普
